1   /*
2    * Copyright (C) 2013 The Guava Authors
3    *
4    * Licensed under the Apache License, Version 2.0 (the "License");
5    * you may not use this file except in compliance with the License.
6    * 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,
12   * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
13   * See the License for the specific language governing permissions and
14   * limitations under the License.
15   */
16  
17  package com.google.common.util.concurrent;
18  
19  import com.google.common.annotations.Beta;
20  import com.google.common.annotations.GwtCompatible;
21  
22  /**
23   * Static utility methods pertaining to the {@link Runnable} interface.
24   *
25   * @since 16.0
26   */
27  @Beta
28  @GwtCompatible
29  public final class Runnables {
30  
31    private static final Runnable EMPTY_RUNNABLE = new Runnable() {
32      @Override
33      public void run() {
34      }
35    };
36  
37    /**
38     * Returns a {@link Runnable} instance that does nothing when run.
39     */
40    public static Runnable doNothing() {
41      return EMPTY_RUNNABLE;
42    }
43  
44    private Runnables() {
45    }
46  }