1 /*
2  * Copyright (C) 2024 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.providers.media.photopicker.sync;
18 
19 import android.content.Context;
20 import android.util.Log;
21 
22 import androidx.annotation.NonNull;
23 import androidx.annotation.Nullable;
24 import androidx.work.Configuration;
25 import androidx.work.WorkManager;
26 
27 import java.util.concurrent.Executor;
28 import java.util.concurrent.Executors;
29 
30 public class WorkManagerInitializer {
31     private static final String TAG = "WorkManagerInitializer";
32     // Thread pool size should be at least equal to the number of unique work requests in
33     // {@link PickerSyncManager} to ensure that any request type is not blocked on other request
34     // types. It is advisable to use unique work requests because in case the number of queued
35     // requests grows, they should not block other work requests.
36     private static final int WORK_MANAGER_THREAD_POOL_SIZE = 6;
37     @Nullable
38     private static volatile Executor sWorkManagerExecutor;
39 
40     /**
41      * Initialize the {@link WorkManager} if it is not initialized already.
42      *
43      * @return a {@link WorkManager} object that can be used to run work requests.
44      */
45     @NonNull
getWorkManager(Context mContext)46     public static WorkManager getWorkManager(Context mContext) {
47         if (!WorkManager.isInitialized()) {
48             Log.i(TAG, "Work manager not initialised. Attempting to initialise.");
49             WorkManager.initialize(mContext, getWorkManagerConfiguration());
50         }
51         return WorkManager.getInstance(mContext);
52     }
53 
54     @NonNull
getWorkManagerConfiguration()55     private static Configuration getWorkManagerConfiguration() {
56         ensureWorkManagerExecutor();
57         return new Configuration.Builder()
58                 .setMinimumLoggingLevel(Log.INFO)
59                 .setExecutor(sWorkManagerExecutor)
60                 .build();
61     }
62 
ensureWorkManagerExecutor()63     private static void ensureWorkManagerExecutor() {
64         if (sWorkManagerExecutor == null) {
65             synchronized (WorkManagerInitializer.class) {
66                 if (sWorkManagerExecutor == null) {
67                     sWorkManagerExecutor = Executors
68                             .newFixedThreadPool(WORK_MANAGER_THREAD_POOL_SIZE);
69                 }
70             }
71         }
72     }
73 }
74