1 /*
2  * Copyright (C) 2023 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 com.android.devicelockcontroller.util;
18 
19 import com.google.common.util.concurrent.MoreExecutors;
20 
21 import java.util.concurrent.Executor;
22 import java.util.concurrent.Executors;
23 
24 /** An utility class related to multi-threading */
25 public final class ThreadUtils {
26     private static volatile Executor sSequentialSchedulerExecutor;
27 
28     // Prevent instantiation
ThreadUtils()29     private ThreadUtils() {
30     }
31 
32     /**
33      * Get the sequential executor for DeviceLockControllerScheduler.
34      */
getSequentialSchedulerExecutor()35     public static synchronized Executor getSequentialSchedulerExecutor() {
36         if (sSequentialSchedulerExecutor == null) {
37             sSequentialSchedulerExecutor = MoreExecutors.newSequentialExecutor(
38                     Executors.newSingleThreadExecutor());
39         }
40         return sSequentialSchedulerExecutor;
41     }
42 }
43