lCallback</a></span> <span class="parameter-name">callback</span></span><wbr>)
            <span class="returntype parameter">&#8594; <a href="../dart-async/Future-class.html">Future</a><span class="signature">&lt;<wbr><span class="type-parameter">void</span>&gt;</span></span>
          </span>
                  </dt>
        <dd>
          Remove and process all stored messages for a given channel. <a href="../dart-ui/ChannelBuffers/drain.html">[...]</a>
                  
</dd>
        <dt id="handleMessa