| /* |
| * 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 androidx.arch.core.executor; |
| |
| import androidx.annotation.NonNull; |
| import androidx.annotation.RestrictTo; |
| |
| import java.util.ArrayList; |
| import java.util.Collections; |
| import java.util.List; |
| import java.util.concurrent.CountDownLatch; |
| import java.util.concurrent.ExecutorService; |
| import java.util.concurrent.Executors; |
| import java.util.concurrent.ThreadFactory; |
| import java.util.concurrent.TimeUnit; |
| |
| /** |
| * A TaskExecutor that has a real thread for main thread operations and can wait for execution etc. |
| * |
| * @hide |
| */ |
| @RestrictTo(RestrictTo.Scope.LIBRARY_GROUP) |
| public class TaskExecutorWithFakeMainThread extends TaskExecutor { |
| private List<Throwable> mCaughtExceptions = Collections.synchronizedList(new ArrayList |
| <Throwable>()); |
| |
| private ExecutorService mIOService; |
| |
| private Thread mMainThread; |
| private final int mIOThreadCount; |
| |
| private ExecutorService mMainThreadService = |
| Executors.newSingleThreadExecutor(new ThreadFactory() { |
| @Override |
| public Thread newThread(@NonNull final Runnable r) { |
| mMainThread = new LoggingThread(r); |
| return mMainThread; |
| } |
| }); |
| |
| public TaskExecutorWithFakeMainThread(int ioThreadCount) { |
| mIOThreadCount = ioThreadCount; |
| mIOService = Executors.newFixedThreadPool(ioThreadCount, new ThreadFactory() { |
| @Override |
| public Thread newThread(@NonNull Runnable r) { |
| return new LoggingThread(r); |
| } |
| }); |
| } |
| |
| @Override |
| public void executeOnDiskIO(Runnable runnable) { |
| mIOService.execute(runnable); |
| } |
| |
| @Override |
| public void postToMainThread(Runnable runnable) { |
| // Tasks in SingleThreadExecutor are guaranteed to execute sequentially, |
| // and no more than one task will be active at any given time. |
| // So if we call this method from the main thread, new task will be scheduled, |
| // which is equivalent to post. |
| mMainThreadService.execute(runnable); |
| } |
| |
| @Override |
| public boolean isMainThread() { |
| return Thread.currentThread() == mMainThread; |
| } |
| |
| List<Throwable> getErrors() { |
| return mCaughtExceptions; |
| } |
| |
| @SuppressWarnings("SameParameterValue") |
| void shutdown(int timeoutInSeconds) throws InterruptedException { |
| mMainThreadService.shutdown(); |
| mIOService.shutdown(); |
| mMainThreadService.awaitTermination(timeoutInSeconds, TimeUnit.SECONDS); |
| mIOService.awaitTermination(timeoutInSeconds, TimeUnit.SECONDS); |
| } |
| |
| /** |
| * Drains tasks at the given time limit |
| * @param seconds Number of seconds to wait |
| * @throws InterruptedException |
| */ |
| public void drainTasks(int seconds) throws InterruptedException { |
| if (isMainThread()) { |
| throw new IllegalStateException(); |
| } |
| final CountDownLatch enterLatch = new CountDownLatch(mIOThreadCount); |
| final CountDownLatch exitLatch = new CountDownLatch(1); |
| for (int i = 0; i < mIOThreadCount; i++) { |
| executeOnDiskIO(new Runnable() { |
| @Override |
| public void run() { |
| enterLatch.countDown(); |
| try { |
| exitLatch.await(); |
| } catch (InterruptedException e) { |
| throw new RuntimeException(e); |
| } |
| } |
| }); |
| } |
| |
| final CountDownLatch mainLatch = new CountDownLatch(1); |
| postToMainThread(new Runnable() { |
| @Override |
| public void run() { |
| mainLatch.countDown(); |
| } |
| }); |
| if (!enterLatch.await(seconds, TimeUnit.SECONDS)) { |
| throw new AssertionError("Could not drain IO tasks in " + seconds |
| + " seconds"); |
| } |
| exitLatch.countDown(); |
| if (!mainLatch.await(seconds, TimeUnit.SECONDS)) { |
| throw new AssertionError("Could not drain UI tasks in " + seconds |
| + " seconds"); |
| } |
| } |
| |
| @SuppressWarnings("WeakerAccess") |
| class LoggingThread extends Thread { |
| LoggingThread(final Runnable target) { |
| super(new Runnable() { |
| @Override |
| public void run() { |
| try { |
| target.run(); |
| } catch (Throwable t) { |
| mCaughtExceptions.add(t); |
| } |
| } |
| }); |
| } |
| } |
| } |