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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    *   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;
17  
18  import java.util.Set;
19  import java.util.concurrent.RejectedExecutionException;
20  import java.util.concurrent.TimeUnit;
21  
22  /**
23   * Schedules {@link TimerTask}s for one-time future execution in a background
24   * thread.
25   */
26  public interface Timer {
27  
28      /**
29       * Schedules the specified {@link TimerTask} for one-time execution after
30       * the specified delay.
31       *
32       * @return a handle which is associated with the specified task
33       *
34       * @throws IllegalStateException       if this timer has been {@linkplain #stop() stopped} already
35       * @throws RejectedExecutionException if the pending timeouts are too many and creating new timeout
36       *                                    can cause instability in the system.
37       */
38      Timeout newTimeout(TimerTask task, long delay, TimeUnit unit);
39  
40      /**
41       * Releases all resources acquired by this {@link Timer} and cancels all
42       * tasks which were scheduled but not executed yet.
43       *
44       * @return the handles associated with the tasks which were canceled by
45       *         this method
46       */
47      Set<Timeout> stop();
48  }