content: /*
   * Copyright (C) 2017 The Android Open Source Project
   *
   * Licensed under the Apache License, Version 2.0 (the "License");
   * you may not use this file except in compliance with the License.
   * You may obtain a copy of the License at
   *
   *      http://www.apache.org/licenses/LICENSE-2.0
   *
   * Unless required by applicable law or agreed to in writing, software
   * distributed under the License is distributed on an "AS IS" BASIS,
   * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
   * See the License for the specific language governing permissions and
   * limitations under the License.
   */
  
  package android.annotation;
  
  import static java.lang.annotation.ElementType.PARAMETER;
  import static java.lang.annotation.RetentionPolicy.SOURCE;
  
  import android.content.Context;
  import android.os.AsyncTask;
  
  import java.lang.annotation.Retention;
  import java.lang.annotation.Target;
  import java.util.concurrent.Executor;
  
  /**
   * @paramDoc Callback and listener events are dispatched through this
   *           {@link Executor}, providing an easy way to control which thread is
   *           used. To dispatch events through the main thread of your
   *           application, you can use {@link Context#getMainExecutor()}. To
   *           dispatch events through a shared thread pool, you can use
   *           {@link AsyncTask#THREAD_POOL_EXECUTOR}.
   * @hide
   */
  @Retention(SOURCE)
  @Target(PARAMETER)
  public @interface CallbackExecutor {
  }
  