src/org/sonews/daemon/ConnectionWorker.java
author František Kučera <franta-hg@frantovo.cz>
Thu Jul 05 13:19:19 2012 +0200 (2012-07-05)
changeset 119 f5b57e221e38
parent 35 ed84c8bdd87b
permissions -rwxr-xr-x
mezery, tabulátory
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/*
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 *   SONEWS News Server
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 *   see AUTHORS for the list of contributors
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 *
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 *   This program is free software: you can redistribute it and/or modify
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 *   it under the terms of the GNU General Public License as published by
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 *   the Free Software Foundation, either version 3 of the License, or
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 *   (at your option) any later version.
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 *
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 *   This program is distributed in the hope that it will be useful,
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 *   but WITHOUT ANY WARRANTY; without even the implied warranty of
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 *   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
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 *   GNU General Public License for more details.
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 *
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 *   You should have received a copy of the GNU General Public License
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 *   along with this program.  If not, see <http://www.gnu.org/licenses/>.
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 */
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package org.sonews.daemon;
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import org.sonews.util.Log;
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import java.nio.ByteBuffer;
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import java.nio.channels.SocketChannel;
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import java.util.concurrent.ArrayBlockingQueue;
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/**
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 * Does most of the work: parsing input, talking to client and Database.
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 * @author Christian Lins
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 * @since sonews/0.5.0
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 */
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class ConnectionWorker extends AbstractDaemon
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{
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	// 256 pending events should be enough
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	private static ArrayBlockingQueue<SocketChannel> pendingChannels = new ArrayBlockingQueue<SocketChannel>(256, true);
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	/**
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	 * Registers the given channel for further event processing.
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	 * @param channel
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	 */
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	public static void addChannel(SocketChannel channel)
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		throws InterruptedException
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	{
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		pendingChannels.put(channel);
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	}
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	/**
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	 * Processing loop.
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	 */
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	@Override
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	public void run()
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	{
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		while (isRunning()) {
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			try {
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				// Retrieve and remove if available, otherwise wait.
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				SocketChannel channel = pendingChannels.take();
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				if (channel != null) {
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					// Connections.getInstance().get() MAY return null
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					NNTPConnection conn = Connections.getInstance().get(channel);
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					// Try to lock the connection object
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					if (conn != null && conn.tryReadLock()) {
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						ByteBuffer buf = conn.getBuffers().nextInputLine();
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						while (buf != null) // Complete line was received
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						{
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							final byte[] line = new byte[buf.limit()];
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							buf.get(line);
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							ChannelLineBuffers.recycleBuffer(buf);
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							// Here is the actual work done
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							conn.lineReceived(line);
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							// Read next line as we could have already received the next line
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							buf = conn.getBuffers().nextInputLine();
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						}
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						conn.unlockReadLock();
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					} else {
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						addChannel(channel);
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					}
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				}
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			} catch (InterruptedException ex) {
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				Log.get().info("ConnectionWorker interrupted: " + ex);
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			} catch (Exception ex) {
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				Log.get().severe("Exception in ConnectionWorker: " + ex);
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				ex.printStackTrace();
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			}
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		} // end while(isRunning())
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	}
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}