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POjava nio Selector wakeup
 

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    <p>Please point/provide me an working example of <code>selector.wakeup();</code> method between two threads.</p> <p>I tried to create a simple program where a thread is waiting on selector.select() method. Second thread creates some sockets and tries to register with the selector; on which the first thread is blocked. </p> <p>Hence I need to use selector's <code>wakeup</code> method, but somehow the first thread isnt doesn't come out of blocking mode.</p> <p>The javadoc of wakeup method states:</p> <blockquote> <p>If another thread is currently blocked in an invocation of the Selector.select() or Selector.select(long) methods then that invocation will return immediately.</p> </blockquote> <p>P.S There are few other work-around; one of them is select(timeout) but I am trying to figure out where the mistake is.</p> <p>The psuedo-code:</p> <p><em>FIRST THREAD:</em></p> <pre><code>static Selector selector = Selector.open(); while(true) { int n = selectorGlobal.select(); selectorKeySet = selectorGlobal.selectedKeys().iterator(); while (selectorKeySet.hasNext()) { selectionKey = selectorKeySet.next(); if (selectionKey.isReadable()) { //do something } if(selectionKey.isAcceptable()) { //accept } } } </code></pre> <p><em>SECOND THREAD:</em></p> <pre><code>while (itr.hasNext()) { data = (String) itr.next(); String IP = data.get(0); String Port = data.get(1); SocketChannel socketChannel = SocketChannel.open(); socketChannel.configureBlocking(true); boolean isConnected = socketChannel.connect(new InetSocketAddress(IP, Port)); ClassName.selector.wakeup(); SelectionKey selectionKey = SelectSockets.registerChannel(ClassName.selector, socketChannel, SelectionKey.OP_READ); } </code></pre>
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