code:
/* Copyright (c) 2017-2020 The Linux Foundation. All rights reserved.
 *
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions are
 * met:
 *     * Redistributions of source code must retain the above copyright
 *       notice, this list of conditions and the following disclaimer.
 *     * Redistributions in binary form must reproduce the above
 *       copyright notice, this list of conditions and the following
 *       disclaimer in the documentation and/or other materials provided
 *       with the distribution.
 *     * Neither the name of The Linux Foundation nor the names of its
 *       contributors may be used to endorse or promote products derived
 *       from this software without specific prior written permission.
 *
 * THIS SOFTWARE IS PROVIDED "AS IS" AND ANY EXPRESS OR IMPLIED
 * WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF
 * MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NON-INFRINGEMENT
 * ARE DISCLAIMED.  IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS
 * BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
 * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
 * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR
 * BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY,
 * WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE
 * OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN
 * IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
 */
#define LOG_NDEBUG 0
#define LOG_TAG "LocSvc_LocationAPI"

#include <location_interface.h>
#include <dlfcn.h>
#include <loc_pla.h>
#include <log_util.h>
#include <pthread.h>
#include <map>
#include <loc_misc_utils.h>

typedef const GnssInterface* (getGnssInterface)();
typedef const GeofenceInterface* (getGeofenceInterface)();
typedef const BatchingInterface* (getBatchingInterface)();
typedef void (createOSFramework)();
typedef void (destroyOSFramework)();

// GTP services
typedef uint32_t (setOptInStatusGetter)(bool userConsent, responseCallback* callback);
typedef void (enableProviderGetter)();
typedef void (disableProviderGetter)();
typedef void (getSingleNetworkLocationGetter)(trackingCallback* callback);
typedef void (stopNetworkLocationGetter)(trackingCallback* callback);

typedef struct {
    // bit mask of the adpaters that we need to wait for the removeClientCompleteCallback
    // before we invoke the registered locationApiDestroyCompleteCallback
    LocationAdapterTypeMask waitAdapterMask;
    locationApiDestroyCompleteCallback destroyCompleteCb;
} LocationAPIDestroyCbData;

// This is the map for the client that has requested destroy with
// destroy callback provided.
typedef std::map<LocationAPI*, LocationAPIDestroyCbData>
    LocationClientDestroyCbMap;

typedef std::map<LocationAPI*, LocationCallbacks> LocationClientMap;
typedef struct {
    LocationClientMap clientData;
    LocationClientDestroyCbMap destroyClientData;
    LocationControlAPI* controlAPI;
    LocationControlCallbacks controlCallbacks;
    GnssInterface* gnssInterface;
    GeofenceInterface* geofenceInterface;
    BatchingInterface* batchingInterface;
} LocationAPIData;

static LocationAPIData gData = {};
static pthread_mutex_t gDataMutex = PTHREAD_MUTEX_INITIALIZER;
static bool gGnssLoadFailed = false;
static bool gBatchingLoadFailed = false;
static bool gGeofenceLoadFailed = false;
static uint32_t gOSFrameworkRefCount = 0;

template <typename T1, typename T2>
static const T1* loadLocationInterface(const char* library, const char* name) {
    void* libhandle = nullptr;
    T2* getter = (T2*)dlGetSymFromLib(libhandle, library, name);
    if (nullptr == getter) {
        return (const T1*) getter;
    }else {
        return (*getter)();
    }
}

static void createOSFrameworkInstance() {
    void* libHandle = nullptr;
    createOSFramework* getter = (createOSFramework*)dlGetSymFromLib(libHandle,
            "liblocationservice_glue.so", "createOSFramework");
    if (getter != nullptr) {
        (*getter)();
    } else {
        LOC_LOGe("dlGetSymFromLib failed for liblocationservice_glue.so");
    }
}

static void destroyOSFrameworkInstance() {
    void* libHandle = nullptr;
    destroyOSFramework* getter = (destroyOSFramework*)dlGetSymFromLib(libHandle,
            "liblocationservice_glue.so", "destroyOSFramework");
    if (getter != nullptr) {
        (*getter)();
    } else {
        LOC_LOGe("dlGetSymFromLib failed for liblocationservice_glue.so");
    }
}

static bool needsGnssTrackingInfo(LocationCallbacks& locationCallbacks)
{
    return (locationCallbacks.gnssLocationInfoCb != nullptr ||
            locationCallbacks.engineLocationsInfoCb != nullptr ||
            locationCallbacks.gnssSvCb != nullptr ||
            locationCallbacks.gnssNmeaCb != nullptr ||
            locationCallbacks.gnssDataCb != nullptr ||
            locationCallbacks.gnssMeasurementsCb != nullptr);
}

static bool isGnssClient(LocationCallbacks& locationCallbacks)
{
    return (locationCallbacks.gnssNiCb != nullptr ||
            locationCallbacks.trackingCb != nullptr ||
            locationCallbacks.gnssLocationInfoCb != nullptr ||
            locationCallbacks.engineLocationsInfoCb != nullptr ||
            locationCallbacks.gnssSvCb != nullptr ||
            locationCallbacks.gnssNmeaCb != nullptr ||
            locationCallbacks.gnssDataCb != nullptr ||
            locationCallbacks.gnssMeasurementsCb != nullptr ||
            locationCallbacks.locationSystemInfoCb != nullptr);
}

static bool isBatchingClient(LocationCallbacks& locationCallbacks)
{
    return (locationCallbacks.batchingCb != nullptr);
}

static bool isGeofenceClient(LocationCallbacks& locationCallbacks)
{
    return (locationCallbacks.geofenceBreachCb != nullptr ||
            locationCallbacks.geofenceStatusCb != nullptr);
}

void LocationAPI::onRemoveClientCompleteCb (LocationAdapterTypeMask adapterType)
{
    bool invokeCallback = false;
    locationApiDestroyCompleteCallback destroyCompleteCb;
    LOC_LOGd("adatper type %x", adapterType);
    pthread_mutex_lock(&gDataMutex);
    auto it = gData.destroyClientData.find(this);
    if (it != gData.destroyClientData.end()) {
        it->second.waitAdapterMask &= ~adapterType;
        if (it->second.waitAdapterMask == 0) {
            invokeCallback = true;
            destroyCompleteCb = it->second.destroyCompleteCb;
            gData.destroyClientData.erase(it);
        }
    }
    pthread_mutex_unlock(&gDataMutex);

    if (invokeCallback) {
        LOC_LOGd("invoke client destroy cb");
        if (!destroyCompleteCb) {
            (destroyCompleteCb) ();
        }

        delete this;
    }
}

void onGnssRemoveClientCompleteCb (LocationAPI* client)
{
    client->onRemoveClientCompleteCb (LOCATION_ADAPTER_GNSS_TYPE_BIT);
}

void onBatchingRemoveClientCompleteCb (LocationAPI* client)
{
    client->onRemoveClientCompleteCb (LOCATION_ADAPTER_BATCHING_TYPE_BIT);
}

void onGeofenceRemoveClientCompleteCb (LocationAPI* client)
{
    client->onRemoveClientCompleteCb (LOCATION_ADAPTER_GEOFENCE_TYPE_BIT);
}

LocationAPI*
LocationAPI::createInstance (LocationCallbacks& locationCallbacks)
{
    if (nullptr == locationCallbacks.capabilitiesCb ||
        nullptr == locationCallbacks.responseCb ||
        nullptr == locationCallbacks.collectiveResponseCb) {
        LOC_LOGe("missing mandatory callback, return null");
        return NULL;
    }

    LocationAPI* newLocationAPI = new LocationAPI();
    bool requestedCapabilities = false;

    pthread_mutex_lock(&gDataMutex);

    gOSFrameworkRefCount++;
    if (1 == gOSFrameworkRefCount) {
        createOSFrameworkInstance();
    }

    if (isGnssClient(locationCallbacks)) {
        if (NULL == gData.gnssInterface && !gGnssLoadFailed) {
            gData.gnssInterface =
                (GnssInterface*)loadLocationInterface<GnssInterface,
                    getGnssInterface>("libgnss.so", "getGnssInterface");
            if (NULL == gData.gnssInterface) {
                gGnssLoadFailed = true;
                LOC_LOGW("%s:%d]: No gnss interface available", __func__, __LINE__);
            } else {
                gData.gnssInterface->initialize();
            }
        }
        if (NULL != gData.gnssInterface) {
            gData.gnssInterface->addClient(newLocationAPI, locationCallbacks);
            if (!requestedCapabilities) {
                gData.gnssInterface->requestCapabilities(newLocationAPI);
                requestedCapabilities = true;
            }
        }
    }

    if (isBatchingClient(locationCallbacks)) {
        if (NULL == gData.batchingInterface && !gBatchingLoadFailed) {
            gData.batchingInterface =
                (BatchingInterface*)loadLocationInterface<BatchingInterface,
                 getBatchingInterface>("libbatching.so", "getBatchingInterface");
            if (NULL == gData.batchingInterface) {
                gBatchingLoadFailed = true;
                LOC_LOGW("%s:%d]: No batching interface available", __func__, __LINE__);
            } else {
                gData.batchingInterface->initialize();
            }
        }
        if (NULL != gData.batchingInterface) {
            gData.batchingInterface->addClient(newLocationAPI, locationCallbacks);
            if (!requestedCapabilities) {
                gData.batchingInterface->requestCapabilities(newLocationAPI);
                requestedCapabilities = true;
            }
        }
    }

    if (isGeofenceClient(locationCallbacks)) {
        if (NULL == gData.geofenceInterface && !gGeofenceLoadFailed) {
            gData.geofenceInterface =
               (GeofenceInterface*)loadLocationInterface<GeofenceInterface,
               getGeofenceInterface>("libgeofencing.so", "getGeofenceInterface");
            if (NULL == gData.geofenceInterface) {
                gGeofenceLoadFailed = true;
                LOC_LOGW("%s:%d]: No geofence interface available", __func__, __LINE__);
            } else {
                gData.geofenceInterface->initialize();
            }
        }
        if (NULL != gData.geofenceInterface) {
            gData.geofenceInterface->addClient(newLocationAPI, locationCallbacks);
            if (!requestedCapabilities) {
                gData.geofenceInterface->requestCapabilities(newLocationAPI);
                requestedCapabilities = true;
            }
        }
    }

    gData.clientData[newLocationAPI] = locationCallbacks;

    pthread_mutex_unlock(&gDataMutex);

    return newLocationAPI;
}

void
LocationAPI::destroy(locationApiDestroyCompleteCallback destroyCompleteCb)
{
    bool invokeDestroyCb = false;

    pthread_mutex_lock(&gDataMutex);
    auto it = gData.clientData.find(this);
    if (it != gData.clientData.end()) {
        bool removeFromGnssInf = (NULL != gData.gnssInterface);
        bool removeFromBatchingInf = (NULL != gData.batchingInterface);
        bool removeFromGeofenceInf = (NULL != gData.geofenceInterface);
        bool needToWait = (removeFromGnssInf || removeFromBatchingInf || removeFromGeofenceInf);
        LOC_LOGe("removeFromGnssInf: %d, removeFromBatchingInf: %d, removeFromGeofenceInf: %d,"
                 "needToWait: %d", removeFromGnssInf, removeFromBatchingInf, removeFromGeofenceInf,
                 needToWait);

        if ((NULL != destroyCompleteCb) && (true == needToWait)) {
            LocationAPIDestroyCbData destroyCbData = {};
            destroyCbData.destroyCompleteCb = destroyCompleteCb;
            // record down from which adapter we need to wait for the destroy complete callback
            // only when we have received all the needed callbacks from all the associated stacks,
            // we shall notify the client.
            destroyCbData.waitAdapterMask =
                    (removeFromGnssInf ? LOCATION_ADAPTER_GNSS_TYPE_BIT : 0);
            destroyCbData.waitAdapterMask |=
                    (removeFromBatchingInf ? LOCATION_ADAPTER_BATCHING_TYPE_BIT : 0);
            destroyCbData.waitAdapterMask |=
                    (removeFromGeofenceInf ? LOCATION_ADAPTER_GEOFENCE_TYPE_BIT : 0);
            gData.destroyClientData[this] = destroyCbData;
            LOC_LOGi("destroy data stored in the map: 0x%x", destroyCbData.waitAdapterMask);
        }

        if (removeFromGnssInf) {
            gData.gnssInterface->removeClient(it->first,
                                              onGnssRemoveClientCompleteCb);
        }
        if (removeFromBatchingInf) {
            gData.batchingInterface->removeClient(it->first,
                                             onBatchingRemoveClientCompleteCb);
        }
        if (removeFromGeofenceInf) {
            gData.geofenceInterface->removeClient(it->first,
                                                  onGeofenceRemoveClientCompleteCb);
        }

        gData.clientData.erase(it);

        if (!needToWait) {
            invokeDestroyCb = true;
        }
    } else {
        LOC_LOGE("%s:%d]: Location API client %p not found in client data",
                 __func__, __LINE__, this);
    }

    if (1 == gOSFrameworkRefCount) {
        destroyOSFrameworkInstance();
    }
    gOSFrameworkRefCount--;

    pthread_mutex_unlock(&gDataMutex);
    if (invokeDestroyCb) {
        if (!destroyCompleteCb) {
            (destroyCompleteCb) ();
        }
        delete this;
    }
}

LocationAPI::LocationAPI()
{
    LOC_LOGD("LOCATION API CONSTRUCTOR");
}

// private destructor
LocationAPI::~LocationAPI()
{
    LOC_LOGD("LOCATION API DESTRUCTOR");
}

void
LocationAPI::updateCallbacks(LocationCallbacks& locationCallbacks)
{
    if (nullptr == locationCallbacks.capabilitiesCb ||
        nullptr == locationCallbacks.responseCb ||
        nullptr == locationCallbacks.collectiveResponseCb) {
        return;
    }

    pthread_mutex_lock(&gDataMutex);

    if (isGnssClient(locationCallbacks)) {
        if (NULL == gData.gnssInterface && !gGnssLoadFailed) {
            gData.gnssInterface =
                (GnssInterface*)loadLocationInterface<GnssInterface,
                    getGnssInterface>("libgnss.so", "getGnssInterface");
            if (NULL == gData.gnssInterface) {
                gGnssLoadFailed = true;
                LOC_LOGW("%s:%d]: No gnss interface available", __func__, __LINE__);
            } else {
                gData.gnssInterface->initialize();
            }
        }
        if (NULL != gData.gnssInterface) {
            // either adds new Client or updates existing Client
            gData.gnssInterface->addClient(this, locationCallbacks);
        }
    }

    if (isBatchingClient(locationCallbacks)) {
        if (NULL == gData.batchingInterface && !gBatchingLoadFailed) {
            gData.batchingInterface =
                (BatchingInterface*)loadLocationInterface<BatchingInterface,
                 getBatchingInterface>("libbatching.so", "getBatchingInterface");
            if (NULL == gData.batchingInterface) {
                gBatchingLoadFailed = true;
                LOC_LOGW("%s:%d]: No batching interface available", __func__, __LINE__);
            } else {
                gData.batchingInterface->initialize();
            }
        }
        if (NULL != gData.batchingInterface) {
            // either adds new Client or updates existing Client
            gData.batchingInterface->addClient(this, locationCallbacks);
        }
    }

    if (isGeofenceClient(locationCallbacks)) {
        if (NULL == gData.geofenceInterface && !gGeofenceLoadFailed) {
            gData.geofenceInterface =
                (GeofenceInterface*)loadLocationInterface<GeofenceInterface,
                 getGeofenceInterface>("libgeofencing.so", "getGeofenceInterface");
            if (NULL == gData.geofenceInterface) {
                gGeofenceLoadFailed = true;
                LOC_LOGW("%s:%d]: No geofence interface available", __func__, __LINE__);
            } else {
                gData.geofenceInterface->initialize();
            }
        }
        if (NULL != gData.geofenceInterface) {
            // either adds new Client or updates existing Client
            gData.geofenceInterface->addClient(this, locationCallbacks);
        }
    }

    gData.clientData[this] = locationCallbacks;

    pthread_mutex_unlock(&gDataMutex);
}

uint32_t
LocationAPI::startTracking(TrackingOptions& trackingOptions)
{
    uint32_t id = 0;
    pthread_mutex_lock(&gDataMutex);

    auto it = gData.clientData.find(this);
    if (it != gData.clientData.end()) {
        if (NULL != gData.gnssInterface) {
            id = gData.gnssInterface->startTracking(this, trackingOptions);
        } else {
            LOC_LOGE("%s:%d]: No gnss interface available for Location API client %p ",
                     __func__, __LINE__, this);
        }
    } else {
        LOC_LOGE("%s:%d]: Location API client %p not found in client data",
                 __func__, __LINE__, this);
    }

    pthread_mutex_unlock(&gDataMutex);
    return id;
}

void
LocationAPI::stopTracking(uint32_t id)
{
    pthread_mutex_lock(&gDataMutex);

    auto it = gData.clientData.find(this);
    if (it != gData.clientData.end()) {
        if (gData.gnssInterface != NULL) {
            gData.gnssInterface->stopTracking(this, id);
        } else {
            LOC_LOGE("%s:%d]: No gnss interface available for Location API client %p ",
                     __func__, __LINE__, this);
        }
    } else {
        LOC_LOGE("%s:%d]: Location API client %p not found in client data",
                 __func__, __LINE__, this);
    }

    pthread_mutex_unlock(&gDataMutex);
}

void
LocationAPI::updateTrackingOptions(
        uint32_t id, TrackingOptions& trackingOptions)
{
    pthread_mutex_lock(&gDataMutex);

    auto it = gData.clientData.find(this);
    if (it != gData.clientData.end()) {
        if (gData.gnssInterface != NULL) {
            gData.gnssInterface->updateTrackingOptions(this, id, trackingOptions);
        } else {
            LOC_LOGE("%s:%d]: No gnss interface available for Location API client %p ",
                     __func__, __LINE__, this);
        }
    } else {
        LOC_LOGE("%s:%d]: Location API client %p not found in client data",
                 __func__, __LINE__, this);
    }

    pthread_mutex_unlock(&gDataMutex);
}

uint32_t
LocationAPI::startBatching(BatchingOptions &batchingOptions)
{
    uint32_t id = 0;
    pthread_mutex_lock(&gDataMutex);

    if (NULL != gData.batchingInterface) {
        id = gData.batchingInterface->startBatching(this, batchingOptions);
    } else {
        LOC_LOGE("%s:%d]: No batching interface available for Location API client %p ",
                 __func__, __LINE__, this);
    }

    pthread_mutex_unlock(&gDataMutex);
    return id;
}

void
LocationAPI::stopBatching(uint32_t id)
{
    pthread_mutex_lock(&gDataMutex);

    if (NULL != gData.batchingInterface) {
        gData.batchingInterface->stopBatching(this, id);
    } else {
        LOC_LOGE("%s:%d]: No batching interface available for Location API client %p ",
                 __func__, __LINE__, this);
    }

    pthread_mutex_unlock(&gDataMutex);
}

void
LocationAPI::updateBatchingOptions(uint32_t id, BatchingOptions& batchOptions)
{
    pthread_mutex_lock(&gDataMutex);

    if (NULL != gData.batchingInterface) {
        gData.batchingInterface->updateBatchingOptions(this, id, batchOptions);
    } else {
        LOC_LOGE("%s:%d]: No batching interface available for Location API client %p ",
                 __func__, __LINE__, this);
    }

    pthread_mutex_unlock(&gDataMutex);
}

void
LocationAPI::getBatchedLocations(uint32_t id, size_t count)
{
    pthread_mutex_lock(&gDataMutex);

    if (gData.batchingInterface != NULL) {
        gData.batchingInterface->getBatchedLocations(this, id, count);
    } else {
        LOC_LOGE("%s:%d]: No batching interface available for Location API client %p ",
                 __func__, __LINE__, this);
    }

    pthread_mutex_unlock(&gDataMutex);
}

uint32_t*
LocationAPI::addGeofences(size_t count, GeofenceOption* options, GeofenceInfo* info)
{
    uint32_t* ids = NULL;
    pthread_mutex_lock(&gDataMutex);

    if (gData.geofenceInterface != NULL) {
        ids = gData.geofenceInterface->addGeofences(this, count, options, info);
    } else {
        LOC_LOGE("%s:%d]: No geofence interface available for Location API client %p ",
                 __func__, __LINE__, this);
    }

    pthread_mutex_unlock(&gDataMutex);
    return ids;
}

void
LocationAPI::removeGeofences(size_t count, uint32_t* ids)
{
    pthread_mutex_lock(&gDataMutex);

    if (gData.geofenceInterface != NULL) {
        gData.geofenceInterface->removeGeofences(this, count, ids);
    } else {
        LOC_LOGE("%s:%d]: No geofence interface available for Location API client %p ",
                 __func__, __LINE__, this);
    }

    pthread_mutex_unlock(&gDataMutex);
}

void
LocationAPI::modifyGeofences(size_t count, uint32_t* ids, GeofenceOption* options)
{
    pthread_mutex_lock(&gDataMutex);

    if (gData.geofenceInterface != NULL) {
        gData.geofenceInterface->modifyGeofences(this, count, ids, options);
    } else {
        LOC_LOGE("%s:%d]: No geofence interface available for Location API client %p ",
                 __func__, __LINE__, this);
    }

    pthread_mutex_unlock(&gDataMutex);
}

void
LocationAPI::pauseGeofences(size_t count, uint32_t* ids)
{
    pthread_mutex_lock(&gDataMutex);

    if (gData.geofenceInterface != NULL) {
        gData.geofenceInterface->pauseGeofences(this, count, ids);
    } else {
        LOC_LOGE("%s:%d]: No geofence interface available for Location API client %p ",
                 __func__, __LINE__, this);
    }

    pthread_mutex_unlock(&gDataMutex);
}

void
LocationAPI::resumeGeofences(size_t count, uint32_t* ids)
{
    pthread_mutex_lock(&gDataMutex);

    if (gData.geofenceInterface != NULL) {
        gData.geofenceInterface->resumeGeofences(this, count, ids);
    } else {
        LOC_LOGE("%s:%d]: No geofence interface available for Location API client %p ",
                 __func__, __LINE__, this);
    }

    pthread_mutex_unlock(&gDataMutex);
}

void
LocationAPI::gnssNiResponse(uint32_t id, GnssNiResponse response)
{
    pthread_mutex_lock(&gDataMutex);

    if (gData.gnssInterface != NULL) {
        gData.gnssInterface->gnssNiResponse(this, id, response);
    } else {
        LOC_LOGE("%s:%d]: No gnss interface available for Location API client %p ",
                 __func__, __LINE__, this);
    }

    pthread_mutex_unlock(&gDataMutex);
}

void LocationAPI::enableNetworkProvider() {
    void* libHandle = nullptr;
    enableProviderGetter* setter = (enableProviderGetter*)dlGetSymFromLib(libHandle,
            "liblocationservice_glue.so", "enableNetworkProvider");
    if (setter != nullptr) {
        (*setter)();
    } else {
        LOC_LOGe("dlGetSymFromLib failed for liblocationservice_glue.so");
    }
}

void LocationAPI::disableNetworkProvider() {
    void* libHandle = nullptr;
    disableProviderGetter* setter = (disableProviderGetter*)dlGetSymFromLib(libHandle,
            "liblocationservice_glue.so", "disableNetworkProvider");
    if (setter != nullptr) {
        (*setter)();
    } else {
        LOC_LOGe("dlGetSymFromLib failed for liblocationservice_glue.so");
    }
}

void LocationAPI::startNetworkLocation(trackingCallback* callback) {
    void* libHandle = nullptr;
    getSingleNetworkLocationGetter* setter =
            (getSingleNetworkLocationGetter*)dlGetSymFromLib(libHandle,
            "liblocationservice_glue.so", "startNetworkLocation");
    if (setter != nullptr) {
        (*setter)(callback);
    } else {
        LOC_LOGe("dlGetSymFromLib failed for liblocationservice_glue.so");
    }
}

void LocationAPI::stopNetworkLocation(trackingCallback* callback) {
    void* libHandle = nullptr;
    stopNetworkLocationGetter* setter = (stopNetworkLocationGetter*)dlGetSymFromLib(libHandle,
            "liblocationservice_glue.so", "stopNetworkLocation");
    if (setter != nullptr) {
        LOC_LOGe("called");
        (*setter)(callback);
    } else {
        LOC_LOGe("dlGetSymFromLib failed for liblocationservice_glue.so");
    }
}

LocationControlAPI*
LocationControlAPI::createInstance(LocationControlCallbacks& locationControlCallbacks)
{
    LocationControlAPI* controlAPI = NULL;
    pthread_mutex_lock(&gDataMutex);

    if (nullptr != locationControlCallbacks.responseCb && NULL == gData.controlAPI) {
        if (NULL == gData.gnssInterface && !gGnssLoadFailed) {
            gData.gnssInterface =
                (GnssInterface*)loadLocationInterface<GnssInterface,
                    getGnssInterface>("libgnss.so", "getGnssInterface");
            if (NULL == gData.gnssInterface) {
                gGnssLoadFailed = true;
                LOC_LOGW("%s:%d]: No gnss interface available", __func__, __LINE__);
            } else {
                gData.gnssInterface->initialize();
            }
        }
        if (NULL != gData.gnssInterface) {
            gData.controlAPI = new LocationControlAPI();
            gData.controlCallbacks = locationControlCallbacks;
            gData.gnssInterface->setControlCallbacks(locationControlCallbacks);
            controlAPI = gData.controlAPI;
        }
    }

    pthread_mutex_unlock(&gDataMutex);
    return controlAPI;
}

void
LocationControlAPI::destroy()
{
    delete this;
}

LocationControlAPI::LocationControlAPI()
{
    LOC_LOGD("LOCATION CONTROL API CONSTRUCTOR");
}

LocationControlAPI::~LocationControlAPI()
{
    LOC_LOGD("LOCATION CONTROL API DESTRUCTOR");
    pthread_mutex_lock(&gDataMutex);

    gData.controlAPI = NULL;

    pthread_mutex_unlock(&gDataMutex);
}

uint32_t
LocationControlAPI::enable(LocationTechnologyType techType)
{
    uint32_t id = 0;
    pthread_mutex_lock(&gDataMutex);

    if (gData.gnssInterface != NULL) {
        id = gData.gnssInterface->enable(techType);
    } else {
        LOC_LOGE("%s:%d]: No gnss interface available for Location Control API client %p ",
                 __func__, __LINE__, this);
    }

    pthread_mutex_unlock(&gDataMutex);
    return id;
}

void
LocationControlAPI::disable(uint32_t id)
{
    pthread_mutex_lock(&gDataMutex);

    if (gData.gnssInterface != NULL) {
        gData.gnssInterface->disable(id);
    } else {
        LOC_LOGE("%s:%d]: No gnss interface available for Location Control API client %p ",
                 __func__, __LINE__, this);
    }

    pthread_mutex_unlock(&gDataMutex);
}

uint32_t*
LocationControlAPI::gnssUpdateConfig(const GnssConfig& config)
{
    uint32_t* ids = NULL;
    pthread_mutex_lock(&gDataMutex);

    if (gData.gnssInterface != NULL) {
        ids = gData.gnssInterface->gnssUpdateConfig(config);
    } else {
        LOC_LOGE("%s:%d]: No gnss interface available for Location Control API client %p ",
                 __func__, __LINE__, this);
    }

    pthread_mutex_unlock(&gDataMutex);
    return ids;
}

uint32_t* LocationControlAPI::gnssGetConfig(GnssConfigFlagsMask mask) {

    uint32_t* ids = NULL;
    pthread_mutex_lock(&gDataMutex);

    if (NULL != gData.gnssInterface) {
        ids = gData.gnssInterface->gnssGetConfig(mask);
    } else {
        LOC_LOGe("No gnss interface available for Control API client %p", this);
    }

    pthread_mutex_unlock(&gDataMutex);
    return ids;
}

uint32_t
LocationControlAPI::gnssDeleteAidingData(GnssAidingData& data)
{
    uint32_t id = 0;
    pthread_mutex_lock(&gDataMutex);

    if (gData.gnssInterface != NULL) {
        id = gData.gnssInterface->gnssDeleteAidingData(data);
    } else {
        LOC_LOGE("%s:%d]: No gnss interface available for Location Control API client %p ",
                 __func__, __LINE__, this);
    }

    pthread_mutex_unlock(&gDataMutex);
    return id;
}

uint32_t LocationControlAPI::configConstellations(
        const GnssSvTypeConfig& constellationEnablementConfig,
        const GnssSvIdConfig&   blacklistSvConfig) {
    uint32_t id = 0;
    pthread_mutex_lock(&gDataMutex);

    if (gData.gnssInterface != NULL) {
        id = gData.gnssInterface->gnssUpdateSvConfig(
                constellationEnablementConfig, blacklistSvConfig);
    } else {
        LOC_LOGe("No gnss interface available for Location Control API");
    }

    pthread_mutex_unlock(&gDataMutex);
    return id;
}

uint32_t LocationControlAPI::configConstellationSecondaryBand(
        const GnssSvTypeConfig& secondaryBandConfig) {
    uint32_t id = 0;
    pthread_mutex_lock(&gDataMutex);

    if (gData.gnssInterface != NULL) {
        id = gData.gnssInterface->gnssUpdateSecondaryBandConfig(secondaryBandConfig);
    } else {
        LOC_LOGe("No gnss interface available for Location Control API");
    }

    pthread_mutex_unlock(&gDataMutex);
    return id;
}

uint32_t LocationControlAPI::configConstrainedTimeUncertainty(
            bool enable, float tuncThreshold, uint32_t energyBudget) {
    uint32_t id = 0;
    pthread_mutex_lock(&gDataMutex);

    if (gData.gnssInterface != NULL) {
        id = gData.gnssInterface->setConstrainedTunc(enable,
                                                     tuncThreshold,
                                                     energyBudget);
    } else {
        LOC_LOGe("No gnss interface available for Location Control API");
    }

    pthread_mutex_unlock(&gDataMutex);
    return id;
}

uint32_t LocationControlAPI::configPositionAssistedClockEstimator(bool enable) {
    uint32_t id = 0;
    pthread_mutex_lock(&gDataMutex);

    if (gData.gnssInterface != NULL) {
        id = gData.gnssInterface->setPositionAssistedClockEstimator(enable);
    } else {
        LOC_LOGe("No gnss interface available for Location Control API");
    }

    pthread_mutex_unlock(&gDataMutex);
    return id;
}

uint32_t LocationControlAPI::configLeverArm(const LeverArmConfigInfo& configInfo) {
    uint32_t id = 0;
    pthread_mutex_lock(&gDataMutex);

    if (gData.gnssInterface != NULL) {
        id = gData.gnssInterface->configLeverArm(configInfo);
    } else {
        LOC_LOGe("No gnss interface available for Location Control API");
    }

    pthread_mutex_unlock(&gDataMutex);
    return id;
}

uint32_t LocationControlAPI::configRobustLocation(bool enable, bool enableForE911) {
    uint32_t id = 0;
    pthread_mutex_lock(&gDataMutex);

    if (gData.gnssInterface != NULL) {
        id = gData.gnssInterface->configRobustLocation(enable, enableForE911);
    } else {
        LOC_LOGe("No gnss interface available for Location Control API");
    }

    pthread_mutex_unlock(&gDataMutex);
    return id;
}

uint32_t LocationControlAPI::configMinGpsWeek(uint16_t minGpsWeek) {
    uint32_t id = 0;
    pthread_mutex_lock(&gDataMutex);

    if (gData.gnssInterface != NULL) {
        id = gData.gnssInterface->configMinGpsWeek(minGpsWeek);
    } else {
        LOC_LOGe("No gnss interface available for Location Control API");
    }

    pthread_mutex_unlock(&gDataMutex);
    return id;
}

uint32_t LocationControlAPI::configDeadReckoningEngineParams(
        const DeadReckoningEngineConfig& dreConfig) {
    uint32_t id = 0;
    pthread_mutex_lock(&gDataMutex);

    if (gData.gnssInterface != NULL) {
        id = gData.gnssInterface->configDeadReckoningEngineParams(dreConfig);
    } else {
        LOC_LOGe("No gnss interface available for Location Control API");
    }

    pthread_mutex_unlock(&gDataMutex);
    return id;
}

uint32_t LocationControlAPI::configEngineRunState(
        PositioningEngineMask engType, LocEngineRunState engState) {
    uint32_t id = 0;
    pthread_mutex_lock(&gDataMutex);

    if (gData.gnssInterface != NULL) {
        id = gData.gnssInterface->configEngineRunState(engType, engState);
    } else {
        LOC_LOGe("No gnss interface available for Location Control API");
    }

    pthread_mutex_unlock(&gDataMutex);
    return id;
}

uint32_t LocationControlAPI::setOptInStatus(bool userConsent) {
    void* libHandle = nullptr;
    uint32_t sessionId = 0;
    setOptInStatusGetter* setter = (setOptInStatusGetter*)dlGetSymFromLib(libHandle,
            "liblocationservice_glue.so", "setOptInStatus");
    if (setter != nullptr) {
        sessionId = (*setter)(userConsent, &gData.controlCallbacks.responseCb);
    } else {
        LOC_LOGe("dlGetSymFromLib failed for liblocationservice_glue.so");
    }
    return sessionId;
}


code:
/* Copyright (c) 2017-2020 The Linux Foundation. All rights reserved.
 *
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions are
 * met:
 *     * Redistributions of source code must retain the above copyright
 *       notice, this list of conditions and the following disclaimer.
 *     * Redistributions in binary form must reproduce the above
 *       copyright notice, this list of conditions and the following
 *       disclaimer in the documentation and/or other materials provided
 *       with the distribution.
 *     * Neither the name of The Linux Foundation nor the names of its
 *       contributors may be used to endorse or promote products derived
 *       from this software without specific prior written permission.
 *
 * THIS SOFTWARE IS PROVIDED "AS IS" AND ANY EXPRESS OR IMPLIED
 * WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF
 * MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NON-INFRINGEMENT
 * ARE DISCLAIMED.  IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS
 * BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
 * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
 * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR
 * BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY,
 * WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE
 * OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN
 * IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
 */

#ifndef LOCATIONAPI_H
#define LOCATIONAPI_H

#include "ILocationAPI.h"

class LocationAPI : public ILocationAPI
{
private:
    LocationAPI();
    ~LocationAPI();

public:
    /* creates an instance to LocationAPI object.
       Will return NULL if mandatory parameters are invalid or if the maximum number
       of instances have been reached */
    static LocationAPI* createInstance(LocationCallbacks&);

    /* destroy/cleans up the instance, which should be called when LocationControlAPI object is
       no longer needed. LocationControlAPI* returned from createInstance will no longer valid
       after destroy is called.
       If the caller allocates the memory for LocationControlCallbacks used in
       LocationControlAPI::createInstance, then the caller must ensure that the memory still remains
       valid until destroyCompleteCb is invoked.
    */
    void destroy(locationApiDestroyCompleteCallback destroyCompleteCb=nullptr);

    void onRemoveClientCompleteCb (LocationAdapterTypeMask adapterType);

    /* updates/changes the callbacks that will be called.
        mandatory callbacks must be present for callbacks to be successfully updated
        no return value */
    virtual void updateCallbacks(LocationCallbacks&) override;

    /* ================================== TRACKING ================================== */

    /* startTracking starts a tracking session, which returns a session id that will be
       used by the other tracking APIs and also in the responseCallback to match command
       with response. locations are reported on the trackingCallback passed in createInstance
       periodically according to LocationOptions.
        responseCallback returns:
                LOCATION_ERROR_SUCCESS if session was successfully started
                LOCATION_ERROR_ALREADY_STARTED if a startTracking session is already in progress
                LOCATION_ERROR_CALLBACK_MISSING if no trackingCallback was passed in createInstance
                LOCATION_ERROR_INVALID_PARAMETER if TrackingOptions parameter is invalid */
    virtual uint32_t startTracking(TrackingOptions&) override;

    /* stopTracking stops a tracking session associated with id parameter.
        responseCallback returns:
                LOCATION_ERROR_SUCCESS if successful
                LOCATION_ERROR_ID_UNKNOWN if id is not associated with a tracking session */
    virtual void stopTracking(uint32_t id) override;

    /* updateTrackingOptions changes the TrackingOptions of a tracking session associated with id
        responseCallback returns:
                LOCATION_ERROR_SUCCESS if successful
                LOCATION_ERROR_INVALID_PARAMETER if TrackingOptions parameters are invalid
                LOCATION_ERROR_ID_UNKNOWN if id is not associated with a tracking session */
    virtual void updateTrackingOptions(uint32_t id, TrackingOptions&) override;

    /* ================================== BATCHING ================================== */

    /* startBatching starts a batching session, which returns a session id that will be
       used by the other batching APIs and also in the responseCallback to match command
       with response. locations are reported on the batchingCallback passed in createInstance
       periodically according to LocationOptions. A batching session starts tracking on
       the low power processor and delivers them in batches by the batchingCallback when
       the batch is full or when getBatchedLocations is called. This allows for the processor
       that calls this API to sleep when the low power processor can batch locations in the
       backgroup and wake up the processor calling the API only when the batch is full, thus
       saving power
        responseCallback returns:
                LOCATION_ERROR_SUCCESS if session was successful
                LOCATION_ERROR_ALREADY_STARTED if a startBatching session is already in progress
                LOCATION_ERROR_CALLBACK_MISSING if no batchingCallback was passed in createInstance
                LOCATION_ERROR_INVALID_PARAMETER if a parameter is invalid
                LOCATION_ERROR_NOT_SUPPORTED if batching is not supported */
    virtual uint32_t startBatching(BatchingOptions&) override;

    /* stopBatching stops a batching session associated with id parameter.
        responseCallback returns:
                LOCATION_ERROR_SUCCESS if successful
                LOCATION_ERROR_ID_UNKNOWN if id is not associated with batching session */
    virtual void stopBatching(uint32_t id) override;

    /* updateBatchingOptions changes the BatchingOptions of a batching session associated with id
        responseCallback returns:
                LOCATION_ERROR_SUCCESS if successful
                LOCATION_ERROR_INVALID_PARAMETER if BatchingOptions parameters are invalid
                LOCATION_ERROR_ID_UNKNOWN if id is not associated with a batching session */
    virtual void updateBatchingOptions(uint32_t id, BatchingOptions&) override;

    /* getBatchedLocations gets a number of locations that are currently stored/batched
       on the low power processor, delivered by the batchingCallback passed in createInstance.
       Location are then deleted from the batch stored on the low power processor.
        responseCallback returns:
                LOCATION_ERROR_SUCCESS if successful, will be followed by batchingCallback call
                LOCATION_ERROR_CALLBACK_MISSING if no batchingCallback was passed in createInstance
                LOCATION_ERROR_ID_UNKNOWN if id is not associated with a batching session */
    virtual void getBatchedLocations(uint32_t id, size_t count) override;

    /* ================================== GEOFENCE ================================== */

    /* addGeofences adds any number of geofences and returns an array of geofence ids that
       will be used by the other geofence APIs and also in the collectiveResponseCallback to
       match command with response. The geofenceBreachCallback will deliver the status of each
       geofence according to the GeofenceOption for each. The geofence id array returned will
       be valid until the collectiveResponseCallback is called and has returned.
        collectiveResponseCallback returns:
                LOCATION_ERROR_SUCCESS if session was successful
                LOCATION_ERROR_CALLBACK_MISSING if no geofenceBreachCallback
                LOCATION_ERROR_INVALID_PARAMETER if any parameters are invalid
                LOCATION_ERROR_NOT_SUPPORTED if geofence is not supported */
    virtual uint32_t* addGeofences(size_t count, GeofenceOption*, GeofenceInfo*) override;

    /* removeGeofences removes any number of geofences. Caller should delete ids array after
       removeGeofences returneds.
        collectiveResponseCallback returns:
                LOCATION_ERROR_SUCCESS if successful
                LOCATION_ERROR_ID_UNKNOWN if id is not associated with a geofence session */
    virtual void removeGeofences(size_t count, uint32_t* ids) override;

    /* modifyGeofences modifies any number of geofences. Caller should delete ids array after
       modifyGeofences returns.
        collectiveResponseCallback returns:
                LOCATION_ERROR_SUCCESS if successful
                LOCATION_ERROR_ID_UNKNOWN if id is not associated with a geofence session
                LOCATION_ERROR_INVALID_PARAMETER if any parameters are invalid */
    virtual void modifyGeofences(size_t count, uint32_t* ids, GeofenceOption* options) override;

    /* pauseGeofences pauses any number of geofences, which is similar to removeGeofences,
       only that they can be resumed at any time. Caller should delete ids array after
       pauseGeofences returns.
        collectiveResponseCallback returns:
                LOCATION_ERROR_SUCCESS if successful
                LOCATION_ERROR_ID_UNKNOWN if id is not associated with a geofence session */
    virtual void pauseGeofences(size_t count, uint32_t* ids) override;

    /* resumeGeofences resumes any number of geofences that are currently paused. Caller should
       delete ids array after resumeGeofences returns.
        collectiveResponseCallback returns:
                LOCATION_ERROR_SUCCESS if successful
                LOCATION_ERROR_ID_UNKNOWN if id is not associated with a geofence session */
    virtual void resumeGeofences(size_t count, uint32_t* ids) override;

    /* ================================== GNSS ====================================== */

     /* gnssNiResponse is called in response to a gnssNiCallback.
        responseCallback returns:
                LOCATION_ERROR_SUCCESS if session was successful
                LOCATION_ERROR_INVALID_PARAMETER if any parameters in GnssNiResponse are invalid
                LOCATION_ERROR_ID_UNKNOWN if id does not match a gnssNiCallback */
    virtual void gnssNiResponse(uint32_t id, GnssNiResponse response) override;

    /* ================================== NETWORK PROVIDER =========================== */

    /* enableNetworkProvider enables Network Provider */
    virtual void enableNetworkProvider();

    /* disableNetworkProvider disables Network Provider */
    virtual void disableNetworkProvider();

    /* startNetworkLocation start a single shot network location request */
    virtual void startNetworkLocation(trackingCallback* callback);

    /* stopNetworkLocation stop any ongoing network location request */
    virtual void stopNetworkLocation(trackingCallback* callback);
};

typedef struct {
    size_t size; // set to sizeof(LocationControlCallbacks)
    responseCallback responseCb;                     // mandatory
    collectiveResponseCallback collectiveResponseCb; // mandatory
    gnssConfigCallback gnssConfigCb;                 // optional
} LocationControlCallbacks;

class LocationControlAPI : public ILocationControlAPI
{
private:
    LocationControlAPI();
    ~LocationControlAPI();

public:
    /* creates an instance to LocationControlAPI object.
       Will return NULL if mandatory parameters are invalid or if the maximum number
       of instances have been reached. Only once instance allowed */
    static LocationControlAPI* createInstance(LocationControlCallbacks&);

    /* destroy/cleans up the instance, which should be called when LocationControlAPI object is
       no longer needed. LocationControlAPI* returned from createInstance will no longer valid
       after destroy is called */
    void destroy();

    /* enable will enable specific location technology to be used for calculation locations and
       will effectively start a control session if call is successful, which returns a session id
       that will be returned in responseCallback to match command with response. The session id is
       also needed to call the disable command.
       This effect is global for all clients of LocationAPI
        responseCallback returns:
                LOCATION_ERROR_SUCCESS if successful
                LOCATION_ERROR_ALREADY_STARTED if an enable was already called for this techType
                LOCATION_ERROR_INVALID_PARAMETER if any parameters are invalid
                LOCATION_ERROR_GENERAL_FAILURE if failure for any other reason */
    uint32_t enable(LocationTechnologyType techType);

    /* disable will disable specific location technology to be used for calculation locations and
       effectively ends the control session if call is successful.
       id parameter is the session id that was returned in enable responseCallback for techType.
       The session id is no longer valid after disable's responseCallback returns success.
       This effect is global for all clients of LocationAPI
        responseCallback returns:
                LOCATION_ERROR_SUCCESS if successful
                LOCATION_ERROR_ID_UNKNOWN if id was not returned from responseCallback from enable
                LOCATION_ERROR_GENERAL_FAILURE if failure for any other reason */
    void disable(uint32_t id);

    /* gnssUpdateConfig updates the gnss specific configuration, which returns a session id array
       with an id for each of the bits set in GnssConfig.flags, order from low bits to high bits.
       The response for each config that is set will be returned in collectiveResponseCallback.
       The session id array returned will be valid until the collectiveResponseCallback is called
       and has returned. This effect is global for all clients of LocationAPI
        collectiveResponseCallback returns:
                LOCATION_ERROR_SUCCESS if session was successful
                LOCATION_ERROR_INVALID_PARAMETER if any other parameters are invalid
                LOCATION_ERROR_GENERAL_FAILURE if failure for any other reason

      PLEASE NOTE: It is caller's resposibility to FREE the memory of the return value.
                   The memory must be freed by delete [].*/
    virtual uint32_t* gnssUpdateConfig(const GnssConfig& config) override;

    /* gnssGetConfig fetches the current constellation and SV configuration
       on the GNSS engine.
       Returns a session id array with an id for each of the bits set in
       the mask parameter, order from low bits to high bits.
       Response is sent via the registered gnssConfigCallback.
       This effect is global for all clients of LocationAPI
       collectiveResponseCallback returns:
           LOCATION_ERROR_SUCCESS if session was successful
           LOCATION_ERROR_INVALID_PARAMETER if any parameter is invalid
           LOCATION_ERROR_CALLBACK_MISSING If no gnssConfigCallback
                                           was passed in createInstance
           LOCATION_ERROR_NOT_SUPPORTED If read of requested configuration
                                        is not supported

      PLEASE NOTE: It is caller's resposibility to FREE the memory of the return value.
                   The memory must be freed by delete [].*/
    uint32_t* gnssGetConfig(GnssConfigFlagsMask mask);

    /* delete specific gnss aiding data for testing, which returns a session id
       that will be returned in responseCallback to match command with response.
       Only allowed in userdebug builds. This effect is global for all clients of LocationAPI
        responseCallback returns:
                LOCATION_ERROR_SUCCESS if successful
                LOCATION_ERROR_INVALID_PARAMETER if any parameters are invalid
                LOCATION_ERROR_NOT_SUPPORTED if build is not userdebug */
    virtual uint32_t gnssDeleteAidingData(GnssAidingData& data) override;

    /** @brief
        Configure the constellation and SVs to be used by the GNSS engine on
        modem.

        @param
        constellationEnablementConfig: configuration to enable/disable SV
        constellation to be used by SPE engine. When size in
        constellationEnablementConfig is set to 0, this indicates to reset SV
        constellation configuration to modem NV default.

        blacklistSvConfig: configuration to blacklist or unblacklist SVs
        used by SPE engine

        @return
        A session id that will be returned in responseCallback to
        match command with response. This effect is global for all
        clients of LocationAPI responseCallback returns:
                LOCATION_ERROR_SUCCESS if successful
                LOCATION_ERROR_INVALID_PARAMETER if any parameters are invalid
    */
    virtual uint32_t configConstellations(
            const GnssSvTypeConfig& constellationEnablementConfig,
            const GnssSvIdConfig&   blacklistSvConfig) override;

    /** @brief
        Configure the secondary band of constellations to be used by
        the GNSS engine on modem.

        @param
        secondaryBandConfig: configuration the secondary band usage
        for SPE engine

        @return
        A session id that will be returned in responseCallback to
        match command with response. This effect is global for all
        clients of LocationAPI responseCallback returns:
                LOCATION_ERROR_SUCCESS if successful
                LOCATION_ERROR_INVALID_PARAMETER if any parameters are invalid
    */
    virtual uint32_t configConstellationSecondaryBand(
            const GnssSvTypeConfig& secondaryBandConfig) override;

    /** @brief
        Enable or disable the constrained time uncertainty feature.

        @param
        enable: true to enable the constrained time uncertainty
        feature and false to disable the constrainted time
        uncertainty feature.

        @param
        tuncThreshold: this specifies the time uncertainty threshold
        that gps engine need to maintain, in units of milli-seconds.
        Default is 0.0 meaning that modem default value of time
        uncertainty threshold will be used. This parameter is
        ignored when requesting to disable this feature.

        @param
        energyBudget: this specifies the power budget that gps
        engine is allowed to spend to maintain the time uncertainty.
        Default is 0 meaning that GPS engine is not constained by
        power budget and can spend as much power as needed. The
        parameter need to be specified in units of 0.1 milli watt
        second. This parameter is ignored requesting to disable this
        feature.

        @return
        A session id that will be returned in responseCallback to
        match command with response. This effect is global for all
        clients of LocationAPI responseCallback returns:
                LOCATION_ERROR_SUCCESS if successful
                LOCATION_ERROR_INVALID_PARAMETER if any parameters
                are invalid
    */
    virtual uint32_t configConstrainedTimeUncertainty(
            bool enable, float tuncThreshold = 0.0,
            uint32_t energyBudget = 0) override;

    /** @brief
        Enable or disable position assisted clock estimator feature.

        @param
        enable: true to enable position assisted clock estimator and
        false to disable the position assisted clock estimator
        feature.

        @return
        A session id that will be returned in responseCallback to
        match command with response. This effect is global for all
        clients of LocationAPI responseCallback returns:
                LOCATION_ERROR_SUCCESS if successful
                LOCATION_ERROR_INVALID_PARAMETER if any parameters are invalid
    */
    virtual uint32_t configPositionAssistedClockEstimator(bool enable) override;

        /** @brief
        Sets the lever arm parameters for the vehicle.

        @param
        configInfo: lever arm configuration info regarding below two
        types of lever arm info:
        a: GNSS Antenna w.r.t the origin at the IMU e.g.: inertial
        measurement unit.
        b: lever arm parameters regarding the OPF (output frame)
        w.r.t the origin (at the GPS Antenna). Vehicle manufacturers
        prefer the position output to be tied to a specific point in
        the vehicle rather than where the antenna is placed
        (midpoint of the rear axle is typical).

        Caller can choose types of lever arm info to configure via the
        leverMarkTypeMask.

        @return
        A session id that will be returned in responseCallback to
        match command with response. This effect is global for all
        clients of LocationAPI responseCallback returns:
                LOCATION_ERROR_SUCCESS if successful
                LOCATION_ERROR_INVALID_PARAMETER if any parameters are invalid
    */
    virtual uint32_t configLeverArm(const LeverArmConfigInfo& configInfo) override;

    /** @brief
        Configure the robust location setting.

        @param
        enable: true to enable robust location and false to disable
        robust location.

        @param
        enableForE911: true to enable robust location when device is
        on E911 session and false to disable on E911 session.
        This parameter is only valid if robust location is enabled.

        @return
        A session id that will be returned in responseCallback to
        match command with response. This effect is global for all
        clients of LocationAPI responseCallback returns:
                LOCATION_ERROR_SUCCESS if successful
                LOCATION_ERROR_INVALID_PARAMETER if any parameters are invalid
    */
    virtual uint32_t configRobustLocation(bool enable, bool enableForE911) override;

    /** @brief
        Config the minimal GPS week used by modem GNSS engine.

        @param
        minGpsWeek: minimal GPS week to be used by modem GNSS engine.

        @return
        A session id that will be returned in responseCallback to
        match command with response. This effect is global for all
        clients of LocationAPI responseCallback returns:
                LOCATION_ERROR_SUCCESS if successful
                LOCATION_ERROR_INVALID_PARAMETER if any parameters are invalid
    */
    virtual uint32_t configMinGpsWeek(uint16_t minGpsWeek) override;

    /** @brief
        Configure the vehicle body-to-Sensor mount parameters and
        other parameters for dead reckoning position engine.

        @param
        dreConfig: vehicle body-to-Sensor mount angles and other
        parameters.

        @return
        A session id that will be returned in responseCallback to
        match command with response. This effect is global for all
        clients of LocationAPI responseCallback returns:
                LOCATION_ERROR_SUCCESS if successful
                LOCATION_ERROR_INVALID_PARAMETER if any parameters are invalid
    */
    virtual uint32_t configDeadReckoningEngineParams(
            const DeadReckoningEngineConfig& dreConfig) override;

        /** @brief
        This API is used to instruct the specified engine to be in
        the pause/resume state. <br/>

        When the engine is placed in paused state, the engine will
        stop. If there is an on-going session, engine will no longer
        produce fixes. In the paused state, calling API to delete
        aiding data from the paused engine may not have effect.
        Request to delete Aiding data shall be issued after
        engine resume. <br/>

        Currently, only DRE engine will support pause/resume
        request. responseCb() will return not supported when request
        is made to pause/resume none-DRE engine. <br/>

        Request to pause/resume DRE engine can be made with or
        without an on-going session. With QDR engine, on resume, GNSS
        position & heading re-acquisition is needed for DR engine to
        engage. If DR engine is already in the requested state, the
        request will be no-op.  <br/>

        @param
        engType: the engine that is instructed to change its run
        state. <br/>

        engState: the new engine run state that the engine is
        instructed to be in. <br/>

        @return
        A session id that will be returned in responseCallback to
        match command with response. This effect is global for all
        clients of LocationAPI responseCallback returns:
                LOCATION_ERROR_SUCCESS if successful
                LOCATION_ERROR_INVALID_PARAMETER if any parameters are invalid
    */
    virtual uint32_t configEngineRunState(PositioningEngineMask engType,
                                          LocEngineRunState engState) override;

      /** @brief
        Set the EULA opt-in status from system user. This is used as consent to
        use network-based positioning.

        @param
        userConsnt: user agrees to use GTP service or not.

        @return
        A session id that will be returned in responseCallback to
        match command with response.
    */
    virtual uint32_t setOptInStatus(bool userConsent);
};

#endif /* LOCATIONAPI_H */

license: unknown


code:
/* Copyright (c) 2017, 2020-2021 The Linux Foundation. All rights reserved.
 *
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions are
 * met:
 *     * Redistributions of source code must retain the above copyright
 *       notice, this list of conditions and the following disclaimer.
 *     * Redistributions in binary form must reproduce the above
 *       copyright notice, this list of conditions and the following
 *       disclaimer in the documentation and/or other materials provided
 *       with the distribution.
 *     * Neither the name of The Linux Foundation nor the names of its
 *       contributors may be used to endorse or promote products derived
 *       from this software without specific prior written permission.
 *
 * THIS SOFTWARE IS PROVIDED "AS IS" AND ANY EXPRESS OR IMPLIED
 * WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF
 * MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NON-INFRINGEMENT
 * ARE DISCLAIMED.  IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS
 * BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
 * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
 * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR
 * BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY,
 * WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE
 * OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN
 * IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
 */

#define LOG_NDEBUG 0
#define LOG_TAG "LocSvc_APIClientBase"

#include <loc_pla.h>
#include <log_util.h>
#include <inttypes.h>
#include <loc_cfg.h>
#include "LocationAPIClientBase.h"

#define GEOFENCE_SESSION_ID 0xFFFFFFFF
#define CONFIG_SESSION_ID 0xFFFFFFFF

// LocationAPIControlClient
LocationAPIControlClient::LocationAPIControlClient() :
    mEnabled(false)
{
    pthread_mutex_init(&mMutex, nullptr);

    for (int i = 0; i < CTRL_REQUEST_MAX; i++) {
        mRequestQueues[i].reset((uint32_t)0);
    }

    memset(&mConfig, 0, sizeof(GnssConfig));

    LocationControlCallbacks locationControlCallbacks;
    locationControlCallbacks.size = sizeof(LocationControlCallbacks);

    locationControlCallbacks.responseCb =
        [this](LocationError error, uint32_t id) {
            onCtrlResponseCb(error, id);
        };
    locationControlCallbacks.collectiveResponseCb =
        [this](size_t count, LocationError* errors, uint32_t* ids) {
            onCtrlCollectiveResponseCb(count, errors, ids);
        };

    mLocationControlAPI = LocationControlAPI::createInstance(locationControlCallbacks);
}

LocationAPIControlClient::~LocationAPIControlClient()
{
    pthread_mutex_lock(&mMutex);

    if (mLocationControlAPI) {
        mLocationControlAPI->destroy();
        mLocationControlAPI = nullptr;
    }

    for (int i = 0; i < CTRL_REQUEST_MAX; i++) {
        mRequestQueues[i].reset((uint32_t)0);
    }

    pthread_mutex_unlock(&mMutex);

    pthread_mutex_destroy(&mMutex);
}

uint32_t LocationAPIControlClient::locAPIGnssDeleteAidingData(GnssAidingData& data)
{
    uint32_t retVal = LOCATION_ERROR_GENERAL_FAILURE;
    pthread_mutex_lock(&mMutex);
    if (mLocationControlAPI) {
        uint32_t session = mLocationControlAPI->gnssDeleteAidingData(data);
        LOC_LOGI("%s:%d] start new session: %d", __FUNCTION__, __LINE__, session);
        mRequestQueues[CTRL_REQUEST_DELETEAIDINGDATA].reset(session);
        mRequestQueues[CTRL_REQUEST_DELETEAIDINGDATA].push(new GnssDeleteAidingDataRequest(*this));

        retVal = LOCATION_ERROR_SUCCESS;
    }
    pthread_mutex_unlock(&mMutex);

    return retVal;
}

uint32_t LocationAPIControlClient::locAPIEnable(LocationTechnologyType techType)
{
    uint32_t retVal = LOCATION_ERROR_GENERAL_FAILURE;
    pthread_mutex_lock(&mMutex);
    if (mEnabled) {
        // just return success if already enabled
        retVal = LOCATION_ERROR_SUCCESS;
    } else if (mLocationControlAPI) {
        uint32_t session = mLocationControlAPI->enable(techType);
        LOC_LOGI("%s:%d] start new session: %d", __FUNCTION__, __LINE__, session);
        mRequestQueues[CTRL_REQUEST_CONTROL].reset(session);
        mRequestQueues[CTRL_REQUEST_CONTROL].push(new EnableRequest(*this));
        retVal = LOCATION_ERROR_SUCCESS;
        mEnabled = true;
    } else {
        LOC_LOGE("%s:%d] failed.", __FUNCTION__, __LINE__);
    }
    pthread_mutex_unlock(&mMutex);

    return retVal;
}

void LocationAPIControlClient::locAPIDisable()
{
    pthread_mutex_lock(&mMutex);
    if (mEnabled && mLocationControlAPI) {
        uint32_t session = 0;
        session = mRequestQueues[CTRL_REQUEST_CONTROL].getSession();
        if (session > 0) {
            mRequestQueues[CTRL_REQUEST_CONTROL].push(new DisableRequest(*this));
            mLocationControlAPI->disable(session);
            mEnabled = false;
        } else {
            LOC_LOGE("%s:%d] invalid session: %d.", __FUNCTION__, __LINE__, session);
        }
    }
    pthread_mutex_unlock(&mMutex);
}

uint32_t LocationAPIControlClient::locAPIGnssUpdateConfig(GnssConfig config)
{
    uint32_t retVal = LOCATION_ERROR_GENERAL_FAILURE;

    pthread_mutex_lock(&mMutex);
    if (mLocationControlAPI) {
        if (mConfig.equals(config)) {
            LOC_LOGv("GnssConfig is identical to previous call");
            retVal = LOCATION_ERROR_SUCCESS;
        } else {
            mConfig = config;
            uint32_t* idArray = mLocationControlAPI->gnssUpdateConfig(config);
            LOC_LOGv("gnssUpdateConfig return array: %p", idArray);
            if (nullptr != idArray) {
                if (nullptr != mRequestQueues[CTRL_REQUEST_CONFIG_UPDATE].getSessionArrayPtr()) {
                    mRequestQueues[CTRL_REQUEST_CONFIG_UPDATE].reset(idArray);
                }
                mRequestQueues[CTRL_REQUEST_CONFIG_UPDATE].push(new GnssUpdateConfigRequest(*this));
                retVal = LOCATION_ERROR_SUCCESS;
                delete [] idArray;
            }
        }
    }
    pthread_mutex_unlock(&mMutex);
    return retVal;
}

uint32_t LocationAPIControlClient::locAPIGnssGetConfig(GnssConfigFlagsMask mask)
{
    uint32_t retVal = LOCATION_ERROR_GENERAL_FAILURE;

    pthread_mutex_lock(&mMutex);
    if (mLocationControlAPI) {

        uint32_t* idArray = mLocationControlAPI->gnssGetConfig(mask);
        LOC_LOGv("gnssGetConfig return array: %p", idArray);
        if (nullptr != idArray) {
            if (nullptr != mRequestQueues[CTRL_REQUEST_CONFIG_GET].getSessionArrayPtr()) {
                mRequestQueues[CTRL_REQUEST_CONFIG_GET].reset(idArray);
            }
            mRequestQueues[CTRL_REQUEST_CONFIG_GET].push(new GnssGetConfigRequest(*this));
            retVal = LOCATION_ERROR_SUCCESS;
            delete [] idArray;
        }
    }
    pthread_mutex_unlock(&mMutex);
    return retVal;
}

void LocationAPIControlClient::onCtrlResponseCb(LocationError error, uint32_t id)
{
    if (error != LOCATION_ERROR_SUCCESS) {
        LOC_LOGE("%s:%d] ERROR: %d ID: %d", __FUNCTION__, __LINE__, error, id);
    } else {
        LOC_LOGV("%s:%d] SUCCESS: %d id: %d", __FUNCTION__, __LINE__, error, id);
    }
    LocationAPIRequest* request = getRequestBySession(id);
    if (request) {
        request->onResponse(error, id);
        delete request;
    }
}

void LocationAPIControlClient::onCtrlCollectiveResponseCb(
        size_t count, LocationError* errors, uint32_t* ids)
{
    for (size_t i = 0; i < count; i++) {
        if (errors[i] != LOCATION_ERROR_SUCCESS) {
            LOC_LOGE("%s:%d] ERROR: %d ID: %d", __FUNCTION__, __LINE__, errors[i], ids[i]);
        } else {
            LOC_LOGV("%s:%d] SUCCESS: %d id: %d", __FUNCTION__, __LINE__, errors[i], ids[i]);
        }
    }
    LocationAPIRequest* request = getRequestBySessionArrayPtr(ids);
    if (request) {
        request->onCollectiveResponse(count, errors, ids);
        delete request;
    }
}

LocationAPIRequest* LocationAPIControlClient::getRequestBySession(uint32_t session)
{
    pthread_mutex_lock(&mMutex);
    LocationAPIRequest* request = nullptr;

    if (mRequestQueues[CTRL_REQUEST_DELETEAIDINGDATA].getSession() == session) {
        request = mRequestQueues[CTRL_REQUEST_DELETEAIDINGDATA].pop();
    } else if (mRequestQueues[CTRL_REQUEST_CONTROL].getSession() == session) {
        request = mRequestQueues[CTRL_REQUEST_CONTROL].pop();
    }

    pthread_mutex_unlock(&mMutex);
    return request;
}

LocationAPIRequest*
LocationAPIControlClient::getRequestBySessionArrayPtr(
        uint32_t* sessionArrayPtr)
{
    pthread_mutex_lock(&mMutex);
    LocationAPIRequest* request = nullptr;

    if (mRequestQueues[CTRL_REQUEST_CONFIG_UPDATE].getSessionArrayPtr() == sessionArrayPtr) {
        request = mRequestQueues[CTRL_REQUEST_CONFIG_UPDATE].pop();
    } else if (mRequestQueues[CTRL_REQUEST_CONFIG_GET].getSessionArrayPtr() == sessionArrayPtr) {
        request = mRequestQueues[CTRL_REQUEST_CONFIG_GET].pop();
    }

    pthread_mutex_unlock(&mMutex);
    return request;
}

// LocationAPIClientBase
LocationAPIClientBase::LocationAPIClientBase() :
    mGeofenceBreachCallback(nullptr),
    mBatchingStatusCallback(nullptr),
    mLocationAPI(nullptr),
    mBatchSize(-1),
    mTracking(false)
{

    // use recursive mutex, in case callback come from the same thread
    pthread_mutexattr_t attr;
    pthread_mutexattr_init(&attr);
    pthread_mutexattr_settype(&attr, PTHREAD_MUTEX_RECURSIVE);
    pthread_mutex_init(&mMutex, &attr);

    for (int i = 0; i < REQUEST_MAX; i++) {
        mRequestQueues[i].reset((uint32_t)0);
    }
}

void LocationAPIClientBase::locAPISetCallbacks(LocationCallbacks& locationCallbacks)
{
    pthread_mutex_lock(&mMutex);

    if (locationCallbacks.geofenceBreachCb != nullptr) {
        mGeofenceBreachCallback = locationCallbacks.geofenceBreachCb;
        locationCallbacks.geofenceBreachCb =
            [this](GeofenceBreachNotification geofenceBreachNotification) {
                beforeGeofenceBreachCb(geofenceBreachNotification);
            };
    }

    locationCallbacks.capabilitiesCb =
        [this](LocationCapabilitiesMask capabilitiesMask) {
            onCapabilitiesCb(capabilitiesMask);
        };
    locationCallbacks.responseCb = [this](LocationError error, uint32_t id) {
        onResponseCb(error, id);
    };
    locationCallbacks.collectiveResponseCb =
        [this](size_t count, LocationError* errors, uint32_t* ids) {
            onCollectiveResponseCb(count, errors, ids);
        };

    if (locationCallbacks.batchingStatusCb != nullptr) {
        mBatchingStatusCallback = locationCallbacks.batchingStatusCb;
        locationCallbacks.batchingStatusCb =
            [this](BatchingStatusInfo batchStatus, std::list<uint32_t> & tripCompletedList) {
            beforeBatchingStatusCb(batchStatus, tripCompletedList);
        };
    }

    if (mLocationAPI == nullptr ) {
        mLocationAPI = LocationAPI::createInstance(locationCallbacks);
    } else {
        mLocationAPI->updateCallbacks(locationCallbacks);
    }

    pthread_mutex_unlock(&mMutex);
}

void LocationAPIClientBase::destroy()
{
    LOC_LOGD("LocationAPIClientBase::destroy()");

    pthread_mutex_lock(&mMutex);

    mGeofenceBreachCallback = nullptr;

    for (int i = 0; i < REQUEST_MAX; i++) {
        mRequestQueues[i].reset((uint32_t)0);
    }

    LocationAPI* localHandle = nullptr;
    if (nullptr != mLocationAPI) {
        localHandle = mLocationAPI;
        mLocationAPI = nullptr;
    }

    pthread_mutex_unlock(&mMutex);

    // Invoking destroy has the possibility of destroy complete callback
    // being invoked right away in the same context, hence no instance
    // member must be accessed after the destroy call.
    if (nullptr != localHandle) {
        localHandle->destroy([this]() {onLocationApiDestroyCompleteCb();});
    }
}

LocationAPIClientBase::~LocationAPIClientBase()
{
    pthread_mutex_destroy(&mMutex);
}

void LocationAPIClientBase::onLocationApiDestroyCompleteCb()
{
    LOC_LOGD("LocationAPIClientBase::onLocationApiDestroyCompleteCb()");
    delete this;
}

uint32_t LocationAPIClientBase::locAPIStartTracking(TrackingOptions& options)
{
    uint32_t retVal = LOCATION_ERROR_GENERAL_FAILURE;
    pthread_mutex_lock(&mMutex);
    if (mLocationAPI) {
        if (mTracking) {
            LOC_LOGW("%s:%d] Existing tracking session present", __FUNCTION__, __LINE__);
        } else {
            uint32_t session = mLocationAPI->startTracking(options);
            LOC_LOGI("%s:%d] start new session: %d", __FUNCTION__, __LINE__, session);
            // onResponseCb might be called from other thread immediately after
            // startTracking returns, so we are not going to unlock mutex
            // until StartTrackingRequest is pushed into mRequestQueues[REQUEST_TRACKING]
            mRequestQueues[REQUEST_TRACKING].reset(session);
            mRequestQueues[REQUEST_TRACKING].push(new StartTrackingRequest(*this));
            mTracking = true;
        }

        retVal = LOCATION_ERROR_SUCCESS;
    }
    pthread_mutex_unlock(&mMutex);

    return retVal;
}

void LocationAPIClientBase::locAPIStopTracking()
{
    pthread_mutex_lock(&mMutex);
    if (mLocationAPI) {
        uint32_t session = 0;
        session = mRequestQueues[REQUEST_TRACKING].getSession();
        if (session > 0) {
            mRequestQueues[REQUEST_TRACKING].push(new StopTrackingRequest(*this));
            mLocationAPI->stopTracking(session);
            mTracking = false;
        } else {
            LOC_LOGD("%s:%d] invalid session: %d.", __FUNCTION__, __LINE__, session);
        }
    }
    pthread_mutex_unlock(&mMutex);
}

void LocationAPIClientBase::locAPIUpdateTrackingOptions(TrackingOptions& options)
{
    pthread_mutex_lock(&mMutex);
    if (mLocationAPI) {
        uint32_t session = 0;
        session = mRequestQueues[REQUEST_TRACKING].getSession();
        if (session > 0) {
            mRequestQueues[REQUEST_TRACKING].push(new UpdateTrackingOptionsRequest(*this));
            mLocationAPI->updateTrackingOptions(session, options);
        } else {
            LOC_LOGE("%s:%d] invalid session: %d.", __FUNCTION__, __LINE__, session);
        }
    }
    pthread_mutex_unlock(&mMutex);
}

int32_t LocationAPIClientBase::locAPIGetBatchSize()
{
    if (mBatchSize == -1) {
        const loc_param_s_type flp_conf_param_table[] =
        {
            {"BATCH_SIZE", &mBatchSize, nullptr, 'n'},
        };
        UTIL_READ_CONF(LOC_PATH_FLP_CONF, flp_conf_param_table);
        if (mBatchSize < 0) {
            // set mBatchSize to 0 if we got an illegal value from config file
            mBatchSize = 0;
        }
    }
    return mBatchSize;
}

uint32_t LocationAPIClientBase::locAPIStartSession(
        uint32_t id, uint32_t sessionMode, TrackingOptions&& options)
{
    uint32_t retVal = LOCATION_ERROR_GENERAL_FAILURE;
    pthread_mutex_lock(&mMutex);
    if (mLocationAPI) {

        if (mSessionBiDict.hasId(id)) {
            LOC_LOGE("%s:%d] session %d has already started.", __FUNCTION__, __LINE__, id);
            retVal = LOCATION_ERROR_ALREADY_STARTED;
        } else {
            uint32_t trackingSession = 0;
            uint32_t batchingSession = 0;

            if (sessionMode == SESSION_MODE_ON_FIX) {
                trackingSession = mLocationAPI->startTracking(options);
                LOC_LOGI("%s:%d] start new session: %d", __FUNCTION__, __LINE__, trackingSession);
                mRequestQueues[REQUEST_SESSION].push(new StartTrackingRequest(*this));
            } else {
                // Fill in the batch mode
                BatchingOptions batchOptions = {};
                batchOptions.size = sizeof(BatchingOptions);
                switch (sessionMode) {
                case SESSION_MODE_ON_FULL:
                    batchOptions.batchingMode = BATCHING_MODE_ROUTINE;
                    break;
                case SESSION_MODE_ON_TRIP_COMPLETED:
                    batchOptions.batchingMode = BATCHING_MODE_TRIP;
                    break;
                default:
                    batchOptions.batchingMode = BATCHING_MODE_NO_AUTO_REPORT;
                    break;
                }

                // Populate location option values
                batchOptions.minDistance = options.minDistance;
                batchOptions.minInterval = options.minInterval;
                batchOptions.mode = options.mode;

                batchingSession = mLocationAPI->startBatching(batchOptions);
                LOC_LOGI("%s:%d] start new session: %d", __FUNCTION__, __LINE__, batchingSession);
                mRequestQueues[REQUEST_SESSION].setSession(batchingSession);
                mRequestQueues[REQUEST_SESSION].push(new StartBatchingRequest(*this));
            }

            uint32_t session = ((sessionMode != SESSION_MODE_ON_FIX) ?
                    batchingSession : trackingSession);

            SessionEntity entity;
            entity.id = id;
            entity.trackingSession = trackingSession;
            entity.batchingSession = batchingSession;
            entity.sessionMode = sessionMode;
            mSessionBiDict.set(id, session, entity);

            retVal = LOCATION_ERROR_SUCCESS;
        }

    }
    pthread_mutex_unlock(&mMutex);

    return retVal;
}

uint32_t LocationAPIClientBase::locAPIStopSession(uint32_t id)
{
    uint32_t retVal = LOCATION_ERROR_GENERAL_FAILURE;
    pthread_mutex_lock(&mMutex);
    if (mLocationAPI) {

        if (mSessionBiDict.hasId(id)) {
            SessionEntity entity = mSessionBiDict.getExtById(id);

            uint32_t trackingSession = entity.trackingSession;
            uint32_t batchingSession = entity.batchingSession;
            uint32_t sMode = entity.sessionMode;

            if (sMode == SESSION_MODE_ON_FIX) {
                mRequestQueues[REQUEST_SESSION].push(new StopTrackingRequest(*this));
                mLocationAPI->stopTracking(trackingSession);
            } else {
                mRequestQueues[REQUEST_SESSION].push(new StopBatchingRequest(*this));
                mLocationAPI->stopBatching(batchingSession);
            }

            retVal = LOCATION_ERROR_SUCCESS;
        } else {
            retVal = LOCATION_ERROR_ID_UNKNOWN;
            LOC_LOGE("%s:%d] session %d is not exist.", __FUNCTION__, __LINE__, id);
        }

    }
    pthread_mutex_unlock(&mMutex);
    return retVal;
}

uint32_t LocationAPIClientBase::locAPIUpdateSessionOptions(
        uint32_t id, uint32_t sessionMode, TrackingOptions&& options)
{
    uint32_t retVal = LOCATION_ERROR_GENERAL_FAILURE;
    pthread_mutex_lock(&mMutex);
    if (mLocationAPI) {

        if (mSessionBiDict.hasId(id)) {
            SessionEntity entity = mSessionBiDict.getExtById(id);

            uint32_t trackingSession = entity.trackingSession;
            uint32_t batchingSession = entity.batchingSession;
            uint32_t sMode = entity.sessionMode;

            if (sessionMode == SESSION_MODE_ON_FIX) {
                // we only add an UpdateTrackingOptionsRequest to mRequestQueues[REQUEST_SESSION],
                // even if this update request will stop batching and then start tracking.
                mRequestQueues[REQUEST_SESSION].push(new UpdateTrackingOptionsRequest(*this));
                if (sMode == SESSION_MODE_ON_FIX) {
                    mLocationAPI->updateTrackingOptions(trackingSession, options);
                } else  {
                    // stop batching
                    // batchingSession will be removed from mSessionBiDict soon,
                    // so we don't need to add a new request to mRequestQueues[REQUEST_SESSION].
                    mLocationAPI->stopBatching(batchingSession);
                    batchingSession = 0;
                    mRequestQueues[REQUEST_SESSION].setSession(batchingSession);

                    // start tracking
                    trackingSession = mLocationAPI->startTracking(options);
                    LOC_LOGI("%s:%d] start new session: %d",
                            __FUNCTION__, __LINE__, trackingSession);
                }
            } else {
                // we only add an UpdateBatchingOptionsRequest to mRequestQueues[REQUEST_SESSION],
                // even if this update request will stop tracking and then start batching.
                mRequestQueues[REQUEST_SESSION].push(new UpdateBatchingOptionsRequest(*this));
                BatchingOptions batchOptions = {};
                batchOptions.size = sizeof(BatchingOptions);
                switch (sessionMode) {
                case SESSION_MODE_ON_FULL:
                    batchOptions.batchingMode = BATCHING_MODE_ROUTINE;
                    break;
                case SESSION_MODE_ON_TRIP_COMPLETED:
                    batchOptions.batchingMode = BATCHING_MODE_TRIP;
                    break;
                default:
                    batchOptions.batchingMode = BATCHING_MODE_NO_AUTO_REPORT;
                    break;
                }

                if (sMode == SESSION_MODE_ON_FIX) {
                    // stop tracking
                    // trackingSession will be removed from mSessionBiDict soon,
                    // so we don't need to add a new request to mRequestQueues[REQUEST_SESSION].
                    mLocationAPI->stopTracking(trackingSession);
                    trackingSession = 0;

                    // Populate location option values
                    batchOptions.minDistance = options.minDistance;
                    batchOptions.minInterval = options.minInterval;
                    batchOptions.mode = options.mode;

                    // start batching
                    batchingSession = mLocationAPI->startBatching(batchOptions);
                    LOC_LOGI("%s:%d] start new session: %d",
                            __FUNCTION__, __LINE__, batchingSession);
                    mRequestQueues[REQUEST_SESSION].setSession(batchingSession);
                } else {
                    mLocationAPI->updateBatchingOptions(batchingSession, batchOptions);
                }

            }

            uint32_t session = ((sessionMode != SESSION_MODE_ON_FIX) ?
                    batchingSession : trackingSession);

            entity.trackingSession = trackingSession;
            entity.batchingSession = batchingSession;
            entity.sessionMode = sessionMode;
            // remove the old values from mSessionBiDict before we add a new one.
            mSessionBiDict.rmById(id);
            mSessionBiDict.set(id, session, entity);

            retVal = LOCATION_ERROR_SUCCESS;
        } else {
            retVal = LOCATION_ERROR_ID_UNKNOWN;
            LOC_LOGE("%s:%d] session %d is not exist.", __FUNCTION__, __LINE__, id);
        }
    }
    pthread_mutex_unlock(&mMutex);
    return retVal;
}

uint32_t LocationAPIClientBase::locAPIGetBatchedLocations(uint32_t id, size_t count)
{
    uint32_t retVal = LOCATION_ERROR_GENERAL_FAILURE;
    pthread_mutex_lock(&mMutex);
    if (mLocationAPI) {
        if (mSessionBiDict.hasId(id)) {
            SessionEntity entity = mSessionBiDict.getExtById(id);
            if (entity.sessionMode != SESSION_MODE_ON_FIX) {
                uint32_t batchingSession = entity.batchingSession;
                mRequestQueues[REQUEST_SESSION].push(new GetBatchedLocationsRequest(*this));
                mLocationAPI->getBatchedLocations(batchingSession, count);
                retVal = LOCATION_ERROR_SUCCESS;
            }  else {
                LOC_LOGE("%s:%d] Unsupported for session id: %d, mode is SESSION_MODE_ON_FIX",
                            __FUNCTION__, __LINE__, id);
                retVal = LOCATION_ERROR_NOT_SUPPORTED;
            }
        }  else {
            retVal = LOCATION_ERROR_ID_UNKNOWN;
            LOC_LOGd("unknown session id: %d, might flush() a stopped session",  id);
        }
    }
    pthread_mutex_unlock(&mMutex);

    return retVal;
}

uint32_t LocationAPIClientBase::locAPIAddGeofences(
        size_t count, uint32_t* ids, GeofenceOption* options, GeofenceInfo* data)
{
    uint32_t retVal = LOCATION_ERROR_GENERAL_FAILURE;
    pthread_mutex_lock(&mMutex);
    if (mLocationAPI) {
        if (mRequestQueues[REQUEST_GEOFENCE].getSession() != GEOFENCE_SESSION_ID) {
            mRequestQueues[REQUEST_GEOFENCE].reset(GEOFENCE_SESSION_ID);
        }
        uint32_t* sessions = mLocationAPI->addGeofences(count, options, data);
        if (sessions) {
            LOC_LOGI("%s:%d] start new sessions: %p", __FUNCTION__, __LINE__, sessions);
            mRequestQueues[REQUEST_GEOFENCE].push(new AddGeofencesRequest(*this));

            for (size_t i = 0; i < count; i++) {
                mGeofenceBiDict.set(ids[i], sessions[i], options[i].breachTypeMask);
            }
            retVal = LOCATION_ERROR_SUCCESS;
        }
    }
    pthread_mutex_unlock(&mMutex);

    return retVal;
}

void LocationAPIClientBase::locAPIRemoveGeofences(size_t count, uint32_t* ids)
{
    pthread_mutex_lock(&mMutex);
    if (mLocationAPI) {
        uint32_t* sessions = (uint32_t*)malloc(sizeof(uint32_t) * count);
        if (sessions == NULL) {
            LOC_LOGE("%s:%d] Failed to allocate %zu bytes !",
                    __FUNCTION__, __LINE__, sizeof(uint32_t) * count);
            pthread_mutex_unlock(&mMutex);
            return;
        }

        if (mRequestQueues[REQUEST_GEOFENCE].getSession() == GEOFENCE_SESSION_ID) {
            BiDict<GeofenceBreachTypeMask>* removedGeofenceBiDict =
                    new BiDict<GeofenceBreachTypeMask>();
            size_t j = 0;
            for (size_t i = 0; i < count; i++) {
                sessions[j] = mGeofenceBiDict.getSession(ids[i]);
                if (sessions[j] > 0) {
                    GeofenceBreachTypeMask type = mGeofenceBiDict.getExtBySession(sessions[j]);
                    mGeofenceBiDict.rmBySession(sessions[j]);
                    removedGeofenceBiDict->set(ids[i], sessions[j], type);
                    j++;
                }
            }
            if (j > 0) {
                mRequestQueues[REQUEST_GEOFENCE].push(new RemoveGeofencesRequest(*this,
                        removedGeofenceBiDict));
                mLocationAPI->removeGeofences(j, sessions);
            } else {
                delete(removedGeofenceBiDict);
            }
        } else {
            LOC_LOGE("%s:%d] invalid session: %d.", __FUNCTION__, __LINE__,
                    mRequestQueues[REQUEST_GEOFENCE].getSession());
        }

        free(sessions);
    }
    pthread_mutex_unlock(&mMutex);
}

void LocationAPIClientBase::locAPIModifyGeofences(
        size_t count, uint32_t* ids, GeofenceOption* options)
{
    pthread_mutex_lock(&mMutex);
    if (mLocationAPI) {
        uint32_t* sessions = (uint32_t*)malloc(sizeof(uint32_t) * count);
        if (sessions == NULL) {
            LOC_LOGE("%s:%d] Failed to allocate %zu bytes !",
                    __FUNCTION__, __LINE__, sizeof(uint32_t) * count);
            pthread_mutex_unlock(&mMutex);
            return;
        }

        if (mRequestQueues[REQUEST_GEOFENCE].getSession() == GEOFENCE_SESSION_ID) {
            size_t j = 0;
            for (size_t i = 0; i < count; i++) {
                sessions[j] = mGeofenceBiDict.getSession(ids[i]);
                if (sessions[j] > 0) {
                    mGeofenceBiDict.set(ids[i], sessions[j], options[i].breachTypeMask);
                    j++;
                }
            }
            if (j > 0) {
                mRequestQueues[REQUEST_GEOFENCE].push(new ModifyGeofencesRequest(*this));
                mLocationAPI->modifyGeofences(j, sessions, options);
            }
        } else {
            LOC_LOGE("%s:%d] invalid session: %d.", __FUNCTION__, __LINE__,
                    mRequestQueues[REQUEST_GEOFENCE].getSession());
        }

        free(sessions);
    }
    pthread_mutex_unlock(&mMutex);
}

void LocationAPIClientBase::locAPIPauseGeofences(size_t count, uint32_t* ids)
{
    pthread_mutex_lock(&mMutex);
    if (mLocationAPI) {
        uint32_t* sessions = (uint32_t*)malloc(sizeof(uint32_t) * count);
        if (sessions == NULL) {
            LOC_LOGE("%s:%d] Failed to allocate %zu bytes !",
                    __FUNCTION__, __LINE__, sizeof(uint32_t) * count);
            pthread_mutex_unlock(&mMutex);
            return;
        }

        if (mRequestQueues[REQUEST_GEOFENCE].getSession() == GEOFENCE_SESSION_ID) {
            size_t j = 0;
            for (size_t i = 0; i < count; i++) {
                sessions[j] = mGeofenceBiDict.getSession(ids[i]);
                if (sessions[j] > 0) {
                    j++;
                }
            }
            if (j > 0) {
                mRequestQueues[REQUEST_GEOFENCE].push(new PauseGeofencesRequest(*this));
                mLocationAPI->pauseGeofences(j, sessions);
            }
        } else {
            LOC_LOGE("%s:%d] invalid session: %d.", __FUNCTION__, __LINE__,
                    mRequestQueues[REQUEST_GEOFENCE].getSession());
        }

        free(sessions);
    }
    pthread_mutex_unlock(&mMutex);
}

void LocationAPIClientBase::locAPIResumeGeofences(
        size_t count, uint32_t* ids, GeofenceBreachTypeMask* mask)
{
    pthread_mutex_lock(&mMutex);
    if (mLocationAPI) {
        uint32_t* sessions = (uint32_t*)malloc(sizeof(uint32_t) * count);
        if (sessions == NULL) {
            LOC_LOGE("%s:%d] Failed to allocate %zu bytes !",
                    __FUNCTION__, __LINE__, sizeof(uint32_t) * count);
            pthread_mutex_unlock(&mMutex);
            return;
        }

        if (mRequestQueues[REQUEST_GEOFENCE].getSession() == GEOFENCE_SESSION_ID) {
            size_t j = 0;
            for (size_t i = 0; i < count; i++) {
                sessions[j] = mGeofenceBiDict.getSession(ids[i]);
                if (sessions[j] > 0) {
                    if (mask) {
                        mGeofenceBiDict.set(ids[i], sessions[j], mask[i]);
                    }
                    j++;
                }
            }
            if (j > 0) {
                mRequestQueues[REQUEST_GEOFENCE].push(new ResumeGeofencesRequest(*this));
                mLocationAPI->resumeGeofences(j, sessions);
            }
        } else {
            LOC_LOGE("%s:%d] invalid session: %d.", __FUNCTION__, __LINE__,
                    mRequestQueues[REQUEST_GEOFENCE].getSession());
        }

        free(sessions);
    }
    pthread_mutex_unlock(&mMutex);
}

void LocationAPIClientBase::locAPIRemoveAllGeofences()
{
    std::vector<uint32_t> sessionsVec = mGeofenceBiDict.getAllSessions();
    if (sessionsVec.size() > 0) {
        locAPIRemoveGeofences(sessionsVec.size(), &sessionsVec[0]);
    }
}

void LocationAPIClientBase::locAPIGnssNiResponse(uint32_t id, GnssNiResponse response)
{
    pthread_mutex_lock(&mMutex);
    if (mLocationAPI) {
        uint32_t session = id;
        mLocationAPI->gnssNiResponse(id, response);
        LOC_LOGI("%s:%d] start new session: %d", __FUNCTION__, __LINE__, session);
        mRequestQueues[REQUEST_NIRESPONSE].reset(session);
        mRequestQueues[REQUEST_NIRESPONSE].push(new GnssNiResponseRequest(*this));
    }
    pthread_mutex_unlock(&mMutex);
}

void LocationAPIClientBase::beforeGeofenceBreachCb(
        GeofenceBreachNotification geofenceBreachNotification)
{
    uint32_t* ids = (uint32_t*)malloc(sizeof(uint32_t) * geofenceBreachNotification.count);
    uint32_t* backup = geofenceBreachNotification.ids;
    size_t n = geofenceBreachNotification.count;
    geofenceBreachCallback genfenceCallback = nullptr;

    if (ids == NULL) {
        LOC_LOGE("%s:%d] Failed to alloc %zu bytes",
                __FUNCTION__, __LINE__,
                sizeof(uint32_t) * geofenceBreachNotification.count);
        return;
    }

    pthread_mutex_lock(&mMutex);
    if (mGeofenceBreachCallback != nullptr) {
        size_t count = 0;
        for (size_t i = 0; i < n; i++) {
            uint32_t id = mGeofenceBiDict.getId(geofenceBreachNotification.ids[i]);
            GeofenceBreachTypeMask type =
                mGeofenceBiDict.getExtBySession(geofenceBreachNotification.ids[i]);
            // if type == 0, we will not head into the fllowing block anyway.
            // so we don't need to check id and type
            if ((geofenceBreachNotification.type == GEOFENCE_BREACH_ENTER &&
                        (type & GEOFENCE_BREACH_ENTER_BIT)) ||
                    (geofenceBreachNotification.type == GEOFENCE_BREACH_EXIT &&
                     (type & GEOFENCE_BREACH_EXIT_BIT))
               ) {
                ids[count] = id;
                count++;
            }
        }
        geofenceBreachNotification.count = count;
        geofenceBreachNotification.ids = ids;

        genfenceCallback = mGeofenceBreachCallback;
    }
    pthread_mutex_unlock(&mMutex);

    if (genfenceCallback != nullptr) {
        genfenceCallback(geofenceBreachNotification);
    }

    // restore ids
    geofenceBreachNotification.ids = backup;
    geofenceBreachNotification.count = n;
    free(ids);
}

void LocationAPIClientBase::beforeBatchingStatusCb(BatchingStatusInfo batchStatus,
        std::list<uint32_t> & tripCompletedList) {

    // map the trip ids to the client ids
    std::list<uint32_t> tripCompletedClientIdList;
    tripCompletedClientIdList.clear();

    if (batchStatus.batchingStatus == BATCHING_STATUS_TRIP_COMPLETED) {
        for (auto itt = tripCompletedList.begin(); itt != tripCompletedList.end(); itt++) {
            if (mSessionBiDict.hasSession(*itt)) {
                SessionEntity sessEntity = mSessionBiDict.getExtBySession(*itt);

                if (sessEntity.sessionMode == SESSION_MODE_ON_TRIP_COMPLETED) {
                    tripCompletedClientIdList.push_back(sessEntity.id);
                    mSessionBiDict.rmBySession(*itt);
                }
            }
        }
    }

    mBatchingStatusCallback(batchStatus, tripCompletedClientIdList);
}

void LocationAPIClientBase::onResponseCb(LocationError error, uint32_t id)
{
    if (error != LOCATION_ERROR_SUCCESS) {
        LOC_LOGE("%s:%d] ERROR: %d ID: %d", __FUNCTION__, __LINE__, error, id);
    } else {
        LOC_LOGV("%s:%d] SUCCESS: %d id: %d", __FUNCTION__, __LINE__, error, id);
    }
    LocationAPIRequest* request = getRequestBySession(id);
    if (request) {
        request->onResponse(error, id);
        delete request;
    }
}

void LocationAPIClientBase::onCollectiveResponseCb(
        size_t count, LocationError* errors, uint32_t* ids)
{
    for (size_t i = 0; i < count; i++) {
        if (errors[i] != LOCATION_ERROR_SUCCESS) {
            LOC_LOGE("%s:%d] ERROR: %d ID: %d", __FUNCTION__, __LINE__, errors[i], ids[i]);
        } else {
            LOC_LOGV("%s:%d] SUCCESS: %d id: %d", __FUNCTION__, __LINE__, errors[i], ids[i]);
        }
    }
    LocationAPIRequest* request = nullptr;
    pthread_mutex_lock(&mMutex);
    if (mRequestQueues[REQUEST_GEOFENCE].getSession() == GEOFENCE_SESSION_ID) {
        request = mRequestQueues[REQUEST_GEOFENCE].pop();
    }
    pthread_mutex_unlock(&mMutex);
    if (request) {
        request->onCollectiveResponse(count, errors, ids);
        delete request;
    }
}

void LocationAPIClientBase::removeSession(uint32_t session) {
    if (mSessionBiDict.hasSession(session)) {
        mSessionBiDict.rmBySession(session);
    }
}

LocationAPIRequest* LocationAPIClientBase::getRequestBySession(uint32_t session)
{
    pthread_mutex_lock(&mMutex);
    LocationAPIRequest* request = nullptr;
    for (int i = 0; i < REQUEST_MAX; i++) {
        if (i != REQUEST_GEOFENCE &&
                i != REQUEST_SESSION &&
                mRequestQueues[i].getSession() == session) {
            request = mRequestQueues[i].pop();
            break;
        }
    }
    if (request == nullptr) {
        // Can't find a request with correct session,
        // try to find it from mSessionBiDict
        if (mSessionBiDict.hasSession(session)) {
            request = mRequestQueues[REQUEST_SESSION].pop();
        }
    }
    pthread_mutex_unlock(&mMutex);
    return request;
}