/*
    * Copyright 2012 The Netty Project
    *
    * The Netty Project licenses this file to you under the Apache License,
    * version 2.0 (the "License"); you may not use this file except in compliance
    * with the License. You may obtain a copy of the License at:
    *
    *   http://www.apache.org/licenses/LICENSE-2.0
    *
   * Unless required by applicable law or agreed to in writing, software
   * distributed under the License is distributed on an "AS IS" BASIS, WITHOUT
   * WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. See the
   * License for the specific language governing permissions and limitations
   * under the License.
   */
  package org.jboss.netty.channel.socket.oio;
  
  import static org.jboss.netty.channel.Channels.*;
  
  import java.net.SocketAddress;
  import java.util.concurrent.Executor;
  
  import org.jboss.netty.channel.ChannelEvent;
  import org.jboss.netty.channel.ChannelFuture;
  import org.jboss.netty.channel.ChannelFutureListener;
  import org.jboss.netty.channel.ChannelPipeline;
  import org.jboss.netty.channel.ChannelState;
  import org.jboss.netty.channel.ChannelStateEvent;
  import org.jboss.netty.channel.MessageEvent;
  import org.jboss.netty.util.ThreadRenamingRunnable;
  import org.jboss.netty.util.internal.DeadLockProofWorker;
  
  class OioDatagramPipelineSink extends AbstractOioChannelSink {
  
      private final Executor workerExecutor;
  
      OioDatagramPipelineSink(Executor workerExecutor) {
          this.workerExecutor = workerExecutor;
      }
  
      public void eventSunk(
              ChannelPipeline pipeline, ChannelEvent e) throws Exception {
          OioDatagramChannel channel = (OioDatagramChannel) e.getChannel();
          ChannelFuture future = e.getFuture();
          if (e instanceof ChannelStateEvent) {
              ChannelStateEvent stateEvent = (ChannelStateEvent) e;
              ChannelState state = stateEvent.getState();
              Object value = stateEvent.getValue();
              switch (state) {
              case OPEN:
                  if (Boolean.FALSE.equals(value)) {
                      AbstractOioWorker.close(channel, future);
                  }
                  break;
              case BOUND:
                  if (value != null) {
                      bind(channel, future, (SocketAddress) value);
                  } else {
                      AbstractOioWorker.close(channel, future);
                  }
                  break;
              case CONNECTED:
                  if (value != null) {
                      connect(channel, future, (SocketAddress) value);
                  } else {
                      OioDatagramWorker.disconnect(channel, future);
                  }
                  break;
              case INTEREST_OPS:
                  AbstractOioWorker.setInterestOps(channel, future, ((Integer) value).intValue());
                  break;
              }
          } else if (e instanceof MessageEvent) {
              MessageEvent evt = (MessageEvent) e;
              OioDatagramWorker.write(
                      channel, future, evt.getMessage(), evt.getRemoteAddress());
          }
      }
  
      private void bind(
              OioDatagramChannel channel, ChannelFuture future,
              SocketAddress localAddress) {
          boolean bound = false;
          boolean workerStarted = false;
          try {
              channel.socket.bind(localAddress);
              bound = true;
  
              // Fire events
              future.setSuccess();
              fireChannelBound(channel, channel.getLocalAddress());
  
              // Start the business.
              DeadLockProofWorker.start(
                      workerExecutor,
                      new ThreadRenamingRunnable(
                              new OioDatagramWorker(channel),
                              "Old I/O datagram worker (" + channel + ')'));
              workerStarted = true;
         } catch (Throwable t) {
             future.setFailure(t);
             fireExceptionCaught(channel, t);
         } finally {
             if (bound && !workerStarted) {
                 AbstractOioWorker.close(channel, future);
             }
         }
     }
 
     private void connect(
             OioDatagramChannel channel, ChannelFuture future,
             SocketAddress remoteAddress) {
 
         boolean bound = channel.isBound();
         boolean connected = false;
         boolean workerStarted = false;
 
         future.addListener(ChannelFutureListener.CLOSE_ON_FAILURE);
 
         // Clear the cached address so that the next getRemoteAddress() call
         // updates the cache.
         channel.remoteAddress = null;
 
         try {
             channel.socket.connect(remoteAddress);
             connected = true;
 
             // Fire events.
             future.setSuccess();
             if (!bound) {
                 fireChannelBound(channel, channel.getLocalAddress());
             }
             fireChannelConnected(channel, channel.getRemoteAddress());
 
             String threadName = "Old I/O datagram worker (" + channel + ')';
             if (!bound) {
                 // Start the business.
                 DeadLockProofWorker.start(
                         workerExecutor,
                         new ThreadRenamingRunnable(
                                 new OioDatagramWorker(channel), threadName));
             } else {
                 // Worker started by bind() - just rename.
                 Thread workerThread = channel.workerThread;
                 if (workerThread != null) {
                     try {
                         workerThread.setName(threadName);
                     } catch (SecurityException e) {
                         // Ignore.
                     }
                 }
             }
 
             workerStarted = true;
         } catch (Throwable t) {
             future.setFailure(t);
             fireExceptionCaught(channel, t);
         } finally {
             if (connected && !workerStarted) {
                 AbstractOioWorker.close(channel, future);
             }
         }
     }
 }