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<TITLE>Using a Selector to Manage Non-Blocking Server Sockets
(Java Developers Almanac Example)
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<h3>
e179.
Using a Selector to Manage Non-Blocking Server Sockets</h3>
For more information about selectors, see
<a href="../java.nio/NbClient.html" class="eglink"><font size="-1"><b>e176</b> Using a Selector to Manage Non-Blocking Sockets</font></a>.
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This example creates two server sockets and registers them with
a selector. The example then uses the selector to listen for events.
<pre>
try {
// Create the selector
Selector selector = Selector.open();
// Create two non-blocking server sockets on 80 and 81
ServerSocketChannel ssChannel1 = ServerSocketChannel.open();
ssChannel1.configureBlocking(false);
ssChannel1.socket().bind(new InetSocketAddress(<font color="#0066ff"><i>80</i></font>));
ServerSocketChannel ssChannel2 = ServerSocketChannel.open();
ssChannel2.configureBlocking(false);
ssChannel2.socket().bind(new InetSocketAddress(<font color="#0066ff"><i>81</i></font>));
// Register both channels with selector
ssChannel1.register(selector, SelectionKey.OP_ACCEPT);
ssChannel2.register(selector, SelectionKey.OP_ACCEPT);
while (true) {
// Wait for an event
selector.select();
// Get list of selection keys with pending events
Iterator it = selector.selectedKeys().iterator();
// Process each key
while (it.hasNext()) {
// Get the selection key
SelectionKey selKey = (SelectionKey)it.next();
// Remove it from the list to indicate that it is being processed
it.remove();
// Check if it's a connection request
if (selKey.isAcceptable()) {
// Get channel with connection request
ServerSocketChannel ssChannel = (ServerSocketChannel)selKey.channel();
// See <a href="../java.nio/AcceptSocket.html" class="eglink"><font size="-1"><b>e178</b> Accepting a Connection on a ServerSocketChannel</font></a>
// for an example of accepting a connection request
}
}
}
} catch (IOException e) {
}
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Related Examples
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e173. <a class="eglink" href="NbClientSocket.html?l=rel">
Creating a Non-Blocking Socket
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e174. <a class="eglink" href="ReadSocket.html?l=rel">
Reading from a SocketChannel
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e175. <a class="eglink" href="WriteSocket.html?l=rel">
Writing to a SocketChannel
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e176. <a class="eglink" href="NbClient.html?l=rel">
Using a Selector to Manage Non-Blocking Sockets
</a>
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e177. <a class="eglink" href="NbServerSocket.html?l=rel">
Creating a Non-Blocking Server Socket
</a>
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e178. <a class="eglink" href="AcceptSocket.html?l=rel">
Accepting a Connection on a ServerSocketChannel
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e180. <a class="eglink" href="DetectClosed.html?l=rel">
Detecting When a Non-Blocking Socket Is Closed by the Remote Host
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See also:
<a class="eglink" href="/egs/java.nio/pkg.html?l=rel#Byte%20Buffers">
Byte Buffers
</a>
<a class="eglink" href="/egs/java.nio/pkg.html?l=rel#File%20Locking">
File Locking
</a>
<a class="eglink" href="/egs/java.nio/pkg.html?l=rel#Files">
Files
</a>
<a class="eglink" href="/egs/java.nio/pkg.html?l=rel#Streams">
Streams
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