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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:
    *
    *   https://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.util.concurrent;
  
  import java.util.concurrent.Executor;
  import java.util.concurrent.ThreadFactory;
  
  /**
   * Default {@link SingleThreadEventExecutor} implementation which just execute all submitted task in a
   * serial fashion.
   */
  public final class DefaultEventExecutor extends SingleThreadEventExecutor {
  
      public DefaultEventExecutor() {
          this((EventExecutorGroup) null);
      }
  
      public DefaultEventExecutor(ThreadFactory threadFactory) {
          this(null, threadFactory);
      }
  
      public DefaultEventExecutor(Executor executor) {
          this(null, executor);
      }
  
      public DefaultEventExecutor(EventExecutorGroup parent) {
          this(parent, new DefaultThreadFactory(DefaultEventExecutor.class));
      }
  
      public DefaultEventExecutor(EventExecutorGroup parent, ThreadFactory threadFactory) {
          super(parent, threadFactory, true);
      }
  
      public DefaultEventExecutor(EventExecutorGroup parent, Executor executor) {
          super(parent, executor, true);
      }
  
      public DefaultEventExecutor(EventExecutorGroup parent, ThreadFactory threadFactory, int maxPendingTasks,
                                  RejectedExecutionHandler rejectedExecutionHandler) {
          super(parent, threadFactory, true, maxPendingTasks, rejectedExecutionHandler);
      }
  
      public DefaultEventExecutor(EventExecutorGroup parent, Executor executor, int maxPendingTasks,
                                  RejectedExecutionHandler rejectedExecutionHandler) {
          super(parent, executor, true, maxPendingTasks, rejectedExecutionHandler);
      }
  
      @Override
      protected void run() {
          for (;;) {
              Runnable task = takeTask();
              if (task != null) {
                  runTask(task);
                  updateLastExecutionTime();
              }
  
              if (confirmShutdown()) {
                  break;
              }
          }
      }
  }