1 /*
2  * Copyright 2019 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 androidx.lifecycle
18 
19 import java.util.concurrent.Executor
20 import java.util.concurrent.ExecutorService
21 import java.util.concurrent.TimeUnit
22 
23 /** An executor wrapper that tracks active tasks and reports back to a Callback when it changes. */
24 class TrackedExecutor(private val callback: Callback, private val delegate: ExecutorService) :
25     Executor {
executenull26     override fun execute(runnable: Runnable) {
27         callback.inc()
28         delegate.execute {
29             try {
30                 runnable.run()
31             } finally {
32                 callback.dec()
33             }
34         }
35     }
36 
shutdownnull37     fun shutdown(time: Long, unit: TimeUnit): Boolean {
38         delegate.shutdown()
39         return delegate.awaitTermination(time, unit)
40     }
41 
42     interface Callback {
incnull43         fun inc()
44 
45         fun dec()
46     }
47 }
48