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1   /*
2    * Copyright 2013 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   * {@link Executor} which execute tasks in the callers thread.
22   */
23  public final class ImmediateExecutor implements Executor {
24      public static final ImmediateExecutor INSTANCE = new ImmediateExecutor();
25  
26      private  ImmediateExecutor() {
27          // use static instance
28      }
29  
30      @Override
31      public void execute(Runnable command) {
32          if (command == null) {
33              throw new NullPointerException("command");
34          }
35          command.run();
36      }
37  }