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      1 /*
      2  * Copyright 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 androidx.work.impl.utils.taskexecutor;
     18 
     19 import android.support.annotation.Nullable;
     20 import android.support.annotation.RestrictTo;
     21 
     22 /**
     23  * A static class that serves as a central point to execute common tasks in WorkManager.
     24  * This is used for business logic internal to WorkManager and NOT for worker processing.
     25  * Adapted from {@link android.arch.core.executor.ArchTaskExecutor}
     26  * @hide
     27  */
     28 
     29 @RestrictTo(RestrictTo.Scope.LIBRARY_GROUP)
     30 public class WorkManagerTaskExecutor implements TaskExecutor {
     31     private static WorkManagerTaskExecutor sInstance;
     32     private final TaskExecutor mDefaultTaskExecutor = new DefaultTaskExecutor();
     33     private TaskExecutor mTaskExecutor = mDefaultTaskExecutor;
     34 
     35     /**
     36      * Returns an instance of the task executor.
     37      * @return The singleton WorkManagerTaskExecutor.
     38      */
     39     public static synchronized WorkManagerTaskExecutor getInstance() {
     40         if (sInstance == null) {
     41             sInstance = new WorkManagerTaskExecutor();
     42         }
     43         return sInstance;
     44     }
     45 
     46     private WorkManagerTaskExecutor() {
     47     }
     48 
     49     /**
     50      * Overrides the task executor used by {@link androidx.work.impl.WorkManagerImpl}.
     51      *
     52      * @param taskExecutor The instance of the {@link TaskExecutor}.
     53      */
     54     public void setTaskExecutor(@Nullable TaskExecutor taskExecutor) {
     55         mTaskExecutor = taskExecutor == null ? mDefaultTaskExecutor : taskExecutor;
     56     }
     57 
     58     @Override
     59     public void postToMainThread(Runnable r) {
     60         mTaskExecutor.postToMainThread(r);
     61     }
     62 
     63     @Override
     64     public void executeOnBackgroundThread(Runnable r) {
     65         mTaskExecutor.executeOnBackgroundThread(r);
     66     }
     67 }
     68