| /* |
| * Copyright (C) 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 android.arch.core.executor; |
| |
| import android.os.Handler; |
| import android.os.Looper; |
| import android.support.annotation.Nullable; |
| import android.support.annotation.RestrictTo; |
| |
| import java.util.concurrent.ExecutorService; |
| import java.util.concurrent.Executors; |
| |
| /** |
| * @hide |
| */ |
| @RestrictTo(RestrictTo.Scope.LIBRARY_GROUP) |
| public class DefaultTaskExecutor extends TaskExecutor { |
| private final Object mLock = new Object(); |
| private ExecutorService mDiskIO = Executors.newFixedThreadPool(2); |
| |
| @Nullable |
| private volatile Handler mMainHandler; |
| |
| @Override |
| public void executeOnDiskIO(Runnable runnable) { |
| mDiskIO.execute(runnable); |
| } |
| |
| @Override |
| public void postToMainThread(Runnable runnable) { |
| if (mMainHandler == null) { |
| synchronized (mLock) { |
| if (mMainHandler == null) { |
| mMainHandler = new Handler(Looper.getMainLooper()); |
| } |
| } |
| } |
| //noinspection ConstantConditions |
| mMainHandler.post(runnable); |
| } |
| |
| @Override |
| public boolean isMainThread() { |
| return Looper.getMainLooper().getThread() == Thread.currentThread(); |
| } |
| } |