From phgrosjean at sciviews.org  Wed Aug 11 14:42:31 2010
From: phgrosjean at sciviews.org (Philippe Grosjean)
Date: Wed, 11 Aug 2010 14:42:31 +0200
Subject: [Rd] Non-blocking Eval
In-Reply-To: <COL117-W30C37D77057267045E331EC0A00@phx.gbl>
References: <COL117-W11775CC4DBBCB41511CEA7C0BF0@phx.gbl>,
	<A84E66CA-9A25-4991-8533-208FE241AC9E@r-project.org>
	<COL117-W30C37D77057267045E331EC0A00@phx.gbl>
Message-ID: <4C629AB7.60906@sciviews.org>

Hello,

For non-blocking access to R through sockets, you should also look at 
svSockets. It may be more appropriate than RServer for feeding data to 
R, while you have another process running in R that do smething like 
updating a graph, or some other calculations.
Best,

Philippe Grosjean

On 20/07/10 14:10, Martin Kerr wrote:
>
> Sorry I phrased that badly.
> What I'm trying to do is asynchronously add data to R, i.e. a program will periodically dump some readings to the Rserver and then later on another program will run some analysis scripts on them.
> I have managed to add the data via CMD_detachedVoidEval as you suggested.
> How exactly do I go about attaching to the session again? I know it involves some form of session key that comes back from the detach call, but what from does it take? And how do I use this?
> Thanks AgainMartin
>> Subject: Re: [Rd] Non-blocking Eval
>> From: simon.urbanek at r-project.org
>> Date: Mon, 19 Jul 2010 11:34:29 -0400
>> CC: r-devel at r-project.org
>> To: mk2391 at hotmail.com
>>
>> On Jul 19, 2010, at 10:58 AM, Martin Kerr wrote:
>>
>>>
>>> Hello,
>>> I'm currently working with the C++ version of the Rserve Client as part of a student project.
>>> Is there an implementation of a non-blocking interface to Rserve in C++? I can find one via the Java JRI but no equivalent in C++.
>>
>> (Please note that stats-rosuda-devel is the correct list for this.)
>>
>> I'm not quite sure what you mean, because in JRI there is idleEval() which is non-blocking in the sense that it doesn't do anything if R is busy but that doesn't apply to Rserve as by definition R cannot be busy there. There is no non-blocking interface to JRI - all calls are synchronous.
>>
>> If your question is whether you can start an evaluation in Rserve and not wait for the result then there is CMD_detachedVoidEval in Rserve, but the C++ client only implements a subset of the API which does not include that -- however, it is trivial to implement (just send a request with CMD_detachedVoidEval as there is nothing to decode).
>>
>> Cheers,
>> Simon
>>
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[Rd] Non-blocking Eval
Philippe Grosjean