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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.util.concurrent;
17  
18  import java.util.concurrent.Executor;
19  
20  /**
21   * Default {@link SingleThreadEventExecutor} implementation which just execute all submitted task in a
22   * serial fashion.
23   */
24  public final class DefaultEventExecutor extends SingleThreadEventExecutor {
25  
26      public DefaultEventExecutor() {
27          this((EventExecutorGroup) null);
28      }
29  
30      public DefaultEventExecutor(Executor executor) {
31          this(null, executor);
32      }
33  
34      public DefaultEventExecutor(EventExecutorGroup parent) {
35          this(parent, new DefaultExecutorServiceFactory(DefaultEventExecutor.class).newExecutorService(1));
36      }
37  
38      public DefaultEventExecutor(EventExecutorGroup parent, Executor executor) {
39          super(parent, executor, true);
40      }
41  
42      @Override
43      protected void run() {
44          Runnable task = takeTask();
45          if (task != null) {
46              task.run();
47              updateLastExecutionTime();
48          }
49  
50          if (confirmShutdown()) {
51              cleanupAndTerminate(true);
52          } else {
53              scheduleExecution();
54          }
55      }
56  }