WorkManagerTaskExecutor.java
/*
* Copyright 2017 The Android Open Source Project
*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
package androidx.work.impl.utils.taskexecutor;
import android.os.Handler;
import android.os.Looper;
import androidx.annotation.NonNull;
import androidx.annotation.RestrictTo;
import java.util.concurrent.Executor;
import java.util.concurrent.ExecutorService;
import java.util.concurrent.Executors;
import java.util.concurrent.ThreadFactory;
/**
* Default Task Executor for executing common tasks in WorkManager
* @hide
*/
@RestrictTo(RestrictTo.Scope.LIBRARY_GROUP)
public class WorkManagerTaskExecutor implements TaskExecutor {
private final Handler mMainThreadHandler = new Handler(Looper.getMainLooper());
private final Executor mMainThreadExecutor = new Executor() {
@Override
public void execute(@NonNull Runnable command) {
postToMainThread(command);
}
};
// Avoiding synthetic accessor.
volatile Thread mCurrentBackgroundExecutorThread;
private final ThreadFactory mBackgroundThreadFactory = new ThreadFactory() {
private int mThreadsCreated = 0;
@Override
public Thread newThread(@NonNull Runnable r) {
// Delegate to the default factory, but keep track of the current thread being used.
Thread thread = Executors.defaultThreadFactory().newThread(r);
thread.setName("WorkManager-WorkManagerTaskExecutor-thread-" + mThreadsCreated);
mThreadsCreated++;
mCurrentBackgroundExecutorThread = thread;
return thread;
}
};
private final ExecutorService mBackgroundExecutor =
Executors.newSingleThreadExecutor(mBackgroundThreadFactory);
@Override
public void postToMainThread(Runnable r) {
mMainThreadHandler.post(r);
}
@Override
public Executor getMainThreadExecutor() {
return mMainThreadExecutor;
}
@Override
public void executeOnBackgroundThread(Runnable r) {
mBackgroundExecutor.execute(r);
}
@Override
public Executor getBackgroundExecutor() {
return mBackgroundExecutor;
}
@NonNull
@Override
public Thread getBackgroundExecutorThread() {
return mCurrentBackgroundExecutorThread;
}
}