/*
    * Copyright 2009 Red Hat, Inc.
    *
    * Red Hat 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 java.io.OutputStream;
  import java.io.PushbackInputStream;
  import java.net.InetSocketAddress;
  import java.net.Socket;
  import java.net.SocketAddress;
  
  import org.jboss.netty.channel.AbstractChannel;
  import org.jboss.netty.channel.Channel;
  import org.jboss.netty.channel.ChannelFactory;
  import org.jboss.netty.channel.ChannelFuture;
  import org.jboss.netty.channel.ChannelPipeline;
  import org.jboss.netty.channel.ChannelSink;
  import org.jboss.netty.channel.socket.DefaultSocketChannelConfig;
  import org.jboss.netty.channel.socket.SocketChannel;
  import org.jboss.netty.channel.socket.SocketChannelConfig;
  
  /**
   *
   * @author <a href="http://www.jboss.org/netty/">The Netty Project</a>
   * @author <a href="http://gleamynode.net/">Trustin Lee</a>
   *
   * @version $Rev: 2080 $, $Date: 2010-01-26 18:04:19 +0900 (Tue, 26 Jan 2010) $
   *
   */
  abstract class OioSocketChannel extends AbstractChannel
                                  implements SocketChannel {
  
      final Socket socket;
      final Object interestOpsLock = new Object();
      private final SocketChannelConfig config;
      volatile Thread workerThread;
      private volatile InetSocketAddress localAddress;
      private volatile InetSocketAddress remoteAddress;
  
      OioSocketChannel(
              Channel parent,
              ChannelFactory factory,
              ChannelPipeline pipeline,
              ChannelSink sink,
              Socket socket) {
  
          super(parent, factory, pipeline, sink);
  
          this.socket = socket;
          config = new DefaultSocketChannelConfig(socket);
      }
  
      public SocketChannelConfig getConfig() {
          return config;
      }
  
      public InetSocketAddress getLocalAddress() {
          InetSocketAddress localAddress = this.localAddress;
          if (localAddress == null) {
              try {
                  this.localAddress = localAddress =
                      (InetSocketAddress) socket.getLocalSocketAddress();
              } catch (Throwable t) {
                  // Sometimes fails on a closed socket in Windows.
                  return null;
              }
          }
          return localAddress;
      }
  
      public InetSocketAddress getRemoteAddress() {
          InetSocketAddress remoteAddress = this.remoteAddress;
          if (remoteAddress == null) {
              try {
                  this.remoteAddress = remoteAddress =
                      (InetSocketAddress) socket.getRemoteSocketAddress();
              } catch (Throwable t) {
                  // Sometimes fails on a closed socket in Windows.
                  return null;
              }
          }
          return remoteAddress;
      }
  
      public boolean isBound() {
          return isOpen() && socket.isBound();
      }
 
     public boolean isConnected() {
         return isOpen() && socket.isConnected();
     }
 
     @Override
     protected boolean setClosed() {
         return super.setClosed();
     }
 
     @Override
     protected void setInterestOpsNow(int interestOps) {
         super.setInterestOpsNow(interestOps);
     }
 
     abstract PushbackInputStream getInputStream();
     abstract OutputStream getOutputStream();
 
     @Override
     public ChannelFuture write(Object message, SocketAddress remoteAddress) {
         if (remoteAddress == null || remoteAddress.equals(getRemoteAddress())) {
             return super.write(message, null);
         } else {
             return getUnsupportedOperationFuture();
         }
     }
 }