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1   /*
2    * Copyright 2012 The Netty Project
3    *
4    * The Netty Project licenses this file to you under the Apache License,
5    * version 2.0 (the "License"); you may not use this file except in compliance
6    * with the License. You may obtain a copy of the License at:
7    *
8    *   http://www.apache.org/licenses/LICENSE-2.0
9    *
10   * Unless required by applicable law or agreed to in writing, software
11   * distributed under the License is distributed on an "AS IS" BASIS, WITHOUT
12   * WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. See the
13   * License for the specific language governing permissions and limitations
14   * under the License.
15   */
16  package io.netty.channel;
17  
18  /**
19   * {@link SingleThreadEventLoop} which is used to handle OIO {@link Channel}'s. So in general there will be
20   * one {@link ThreadPerChannelEventLoop} per {@link Channel}.
21   *
22   */
23  public class ThreadPerChannelEventLoop extends SingleThreadEventLoop {
24  
25      private final ThreadPerChannelEventLoopGroup parent;
26      private Channel ch;
27  
28      public ThreadPerChannelEventLoop(ThreadPerChannelEventLoopGroup parent) {
29          super(parent, parent.executor, true);
30          this.parent = parent;
31      }
32  
33      @Override
34      public ChannelFuture register(Channel channel, ChannelPromise promise) {
35          return super.register(channel, promise).addListener(new ChannelFutureListener() {
36              @Override
37              public void operationComplete(ChannelFuture future) throws Exception {
38                  if (future.isSuccess()) {
39                      ch = future.channel();
40                  } else {
41                      deregister();
42                  }
43              }
44          });
45      }
46  
47      @Override
48      protected void run() {
49          for (;;) {
50              Runnable task = takeTask();
51              if (task != null) {
52                  task.run();
53                  updateLastExecutionTime();
54              }
55  
56              Channel ch = this.ch;
57              if (isShuttingDown()) {
58                  if (ch != null) {
59                      ch.unsafe().close(ch.unsafe().voidPromise());
60                  }
61                  if (confirmShutdown()) {
62                      cleanupAndTerminate(true);
63                      return;
64                  }
65              } else {
66                  if (ch != null) {
67                      // Handle deregistration
68                      if (!ch.isRegistered()) {
69                          runAllTasks();
70                          deregister();
71                      }
72                  }
73              }
74          }
75      }
76  
77      protected void deregister() {
78          ch = null;
79          parent.activeChildren.remove(this);
80          parent.idleChildren.add(this);
81      }
82  }