src/org/sonews/daemon/ConnectionWorker.java
author cli
Sun, 29 Aug 2010 17:28:58 +0200
changeset 35 ed84c8bdd87b
parent 15 org/sonews/daemon/ConnectionWorker.java@f2293e8566f5
child 37 74139325d305
permissions -rw-r--r--
Moving source files into src/-subdir.
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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
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    = 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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    {
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      try
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      {
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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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        {
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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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          {
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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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          }
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          else
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          {
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            addChannel(channel);
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          }
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        }
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      }
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      catch(InterruptedException ex)
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      {
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        Log.get().info("ConnectionWorker interrupted: " + ex);
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      }
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      catch(Exception ex)
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      {
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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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}