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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    *   https://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 io.netty.util.internal.ObjectUtil;
19  
20  import java.util.concurrent.Executor;
21  
22  /**
23   * {@link Executor} which execute tasks in the callers thread.
24   */
25  public final class ImmediateExecutor implements Executor {
26      public static final ImmediateExecutor INSTANCE = new ImmediateExecutor();
27  
28      private ImmediateExecutor() {
29          // use static instance
30      }
31  
32      @Override
33      public void execute(Runnable command) {
34          ObjectUtil.checkNotNull(command, "command").run();
35      }
36  }