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1   /*
2    * Copyright 2014 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.internal;
17  
18  import io.netty.util.concurrent.EventExecutor;
19  
20  import java.util.concurrent.Callable;
21  
22  /**
23   * Generic interface to wrap an {@link EventExecutor} and a {@link Callable}.
24   *
25   * This interface is used internally to ensure scheduled tasks are executed by
26   * the correct {@link EventExecutor} after channel migration.
27   *
28   * @see io.netty.util.concurrent.ScheduledFutureTask
29   * @see io.netty.util.concurrent.SingleThreadEventExecutor
30   *
31   * @param <V>   the result type of method {@link Callable#call()}.
32   */
33  public interface CallableEventExecutorAdapter<V> extends Callable<V> {
34      /**
35       * Returns the wrapped {@link EventExecutor}.
36       */
37      EventExecutor executor();
38  
39      /**
40       * Returns the wrapped {@link Callable}.
41       */
42      Callable<V> unwrap();
43  }