1 /*
2  * Copyright (C) 2017 The Android Open Source Project
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 android.annotation;
18 
19 import static java.lang.annotation.ElementType.PARAMETER;
20 import static java.lang.annotation.RetentionPolicy.SOURCE;
21 
22 import java.lang.annotation.Retention;
23 import java.lang.annotation.Target;
24 import java.util.concurrent.Executor;
25 
26 /**
27  * @paramDoc Callback and listener events are dispatched through this
28  *           {@link Executor}, providing an easy way to control which thread is
29  *           used. To dispatch events through the main thread of your
30  *           application, you can use
31  *           {@link android.content.Context#getMainExecutor() Context.getMainExecutor()}.
32  *           To dispatch events through a shared thread pool, you can use
33  *           {@link android.os.AsyncTask#THREAD_POOL_EXECUTOR AsyncTask#THREAD_POOL_EXECUTOR}.
34  * @hide
35  */
36 @Retention(SOURCE)
37 @Target(PARAMETER)
38 public @interface CallbackExecutor {
39 }
40