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   /*
    * 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 io.netty.channel;
  
  /**
   * {@link SingleThreadEventLoop} which is used to handle OIO {@link Channel}'s. So in general there will be
   * one {@link ThreadPerChannelEventLoop} per {@link Channel}.
   *
   */
  public class ThreadPerChannelEventLoop extends SingleThreadEventLoop {
  
      private final ThreadPerChannelEventLoopGroup parent;
      private Channel ch;
  
      public ThreadPerChannelEventLoop(ThreadPerChannelEventLoopGroup parent) {
          super(parent, parent.threadFactory, true);
          this.parent = parent;
      }
  
      @Override
      public ChannelFuture register(Channel channel, ChannelPromise promise) {
          return super.register(channel, promise).addListener(new ChannelFutureListener() {
              @Override
              public void operationComplete(ChannelFuture future) throws Exception {
                  if (future.isSuccess()) {
                      ch = future.channel();
                  } else {
                      deregister();
                  }
              }
          });
      }
  
      @Override
      protected void run() {
          for (;;) {
              Runnable task = takeTask();
              if (task != null) {
                  task.run();
                  updateLastExecutionTime();
              }
  
              Channel ch = this.ch;
              if (isShuttingDown()) {
                  if (ch != null) {
                      ch.unsafe().close(ch.unsafe().voidPromise());
                  }
                  if (confirmShutdown()) {
                      break;
                  }
              } else {
                  if (ch != null) {
                      // Handle deregistration
                      if (!ch.isRegistered()) {
                          runAllTasks();
                          deregister();
                      }
                  }
              }
          }
      }
  
      protected void deregister() {
          ch = null;
          parent.activeChildren.remove(this);
          parent.idleChildren.add(this);
      }
  }