chris@1: /*
chris@1:  *   SONEWS News Server
chris@1:  *   see AUTHORS for the list of contributors
chris@1:  *
chris@1:  *   This program is free software: you can redistribute it and/or modify
chris@1:  *   it under the terms of the GNU General Public License as published by
chris@1:  *   the Free Software Foundation, either version 3 of the License, or
chris@1:  *   (at your option) any later version.
chris@1:  *
chris@1:  *   This program is distributed in the hope that it will be useful,
chris@1:  *   but WITHOUT ANY WARRANTY; without even the implied warranty of
chris@1:  *   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
chris@1:  *   GNU General Public License for more details.
chris@1:  *
chris@1:  *   You should have received a copy of the GNU General Public License
chris@1:  *   along with this program.  If not, see <http://www.gnu.org/licenses/>.
chris@1:  */
chris@1: 
chris@1: package org.sonews.daemon;
chris@1: 
chris@1: import org.sonews.util.Log;
chris@1: import java.nio.ByteBuffer;
chris@1: import java.nio.channels.SocketChannel;
chris@1: import java.util.concurrent.ArrayBlockingQueue;
chris@1: 
chris@1: /**
chris@1:  * Does most of the work: parsing input, talking to client and Database.
chris@1:  * @author Christian Lins
chris@1:  * @since sonews/0.5.0
chris@1:  */
chris@1: class ConnectionWorker extends AbstractDaemon
chris@1: {
chris@1: 
cli@37: 	// 256 pending events should be enough
cli@37: 	private static ArrayBlockingQueue<SocketChannel> pendingChannels = new ArrayBlockingQueue<SocketChannel>(256, true);
chris@1: 
cli@37: 	/**
cli@37: 	 * Registers the given channel for further event processing.
cli@37: 	 * @param channel
cli@37: 	 */
cli@37: 	public static void addChannel(SocketChannel channel)
cli@37: 		throws InterruptedException
cli@37: 	{
cli@37: 		pendingChannels.put(channel);
cli@37: 	}
chris@1: 
cli@37: 	/**
cli@37: 	 * Processing loop.
cli@37: 	 */
cli@37: 	@Override
cli@37: 	public void run()
cli@37: 	{
cli@37: 		while (isRunning()) {
cli@37: 			try {
cli@37: 				// Retrieve and remove if available, otherwise wait.
cli@37: 				SocketChannel channel = pendingChannels.take();
cli@37: 
cli@37: 				if (channel != null) {
cli@37: 					// Connections.getInstance().get() MAY return null
cli@37: 					NNTPConnection conn = Connections.getInstance().get(channel);
cli@37: 
cli@37: 					// Try to lock the connection object
cli@37: 					if (conn != null && conn.tryReadLock()) {
cli@37: 						ByteBuffer buf = conn.getBuffers().nextInputLine();
cli@37: 						while (buf != null) // Complete line was received
cli@37: 						{
cli@37: 							final byte[] line = new byte[buf.limit()];
cli@37: 							buf.get(line);
cli@37: 							ChannelLineBuffers.recycleBuffer(buf);
cli@37: 
cli@37: 							// Here is the actual work done
cli@37: 							conn.lineReceived(line);
cli@37: 
cli@37: 							// Read next line as we could have already received the next line
cli@37: 							buf = conn.getBuffers().nextInputLine();
cli@37: 						}
cli@37: 						conn.unlockReadLock();
cli@37: 					} else {
cli@37: 						addChannel(channel);
cli@37: 					}
cli@37: 				}
cli@37: 			} catch (InterruptedException ex) {
cli@37: 				Log.get().info("ConnectionWorker interrupted: " + ex);
cli@37: 			} catch (Exception ex) {
cli@37: 				Log.get().severe("Exception in ConnectionWorker: " + ex);
cli@37: 				ex.printStackTrace();
cli@37: 			}
cli@37: 		} // end while(isRunning())
cli@37: 	}
chris@1: }