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POSelectable Multicast socket (pre 1.7)
 

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    <p>With the advent of NIO most socket types could be "selectable" through the SelectableChannel implementation. Unfortunately the DatagramChannel does not support multicast prior to java 7. Multicast <b>is</b> supported in prior versions via the <code>MulticastSocket</code> class.</p> <p>I want some way to be able to detect that there are pending messages (i.e. readable) messages on a <b>multicast datagram</b> socket. I would like to read until there are no remaining datagrams within the immediate time window. Having received all pending messages, then want to invoke a callback, <b>but not individually or prior to having read all pending messages</b>. </p> <p>Making this simpler, let's assume one socket. In pseudo code:</p> <pre><code>List&lt;Msg&gt; received = new ArrayList&lt;Msg&gt; while (true) { received.clear(); // initial blocking receive data = receive_blocking (socket, datagram) received.add (new Msg(data)); // flush out remaining messages for (boolean receiving = true ; receiving ; ) { // non-blocking if (receive_nonblocking (socket, datagram)) received.add (new Msg(datagram)); else receiving = false; } callback (received); } </code></pre> <p>The question is how to implement <code>receive_nonblocking</code> without NIO 2. I do not need the Selector mechanism, but wondering whether there is some way I can do a non-blocking read(s) or otherwise detect whether there is something pending.</p> <p>I had read that to use the selector, the channels must be created directly as in <code>new DatagramChannel()</code>, rather than acquiring a channel after socket creation. So if am correct, could not use the <code>socket.getChannel()</code> to create a selector post socket creation.</p> <p>Is there any way to do this that doesn't involve JNI or timers, pre java 7?</p>
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