| /* |
| * 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.testing; |
| |
| import android.os.Handler; |
| import android.os.HandlerThread; |
| import android.os.Looper; |
| import android.os.Message; |
| import android.os.MessageQueue; |
| import android.os.TestLooperManager; |
| import android.support.test.InstrumentationRegistry; |
| import android.util.ArrayMap; |
| |
| import org.junit.runners.model.FrameworkMethod; |
| |
| import java.lang.annotation.ElementType; |
| import java.lang.annotation.Retention; |
| import java.lang.annotation.RetentionPolicy; |
| import java.lang.annotation.Target; |
| import java.lang.reflect.Field; |
| import java.util.Map; |
| |
| /** |
| * Creates a looper on the current thread with control over if/when messages are |
| * executed. Warning: This class works through some reflection and may break/need |
| * to be updated from time to time. |
| */ |
| public class TestableLooper { |
| |
| private Looper mLooper; |
| private MessageQueue mQueue; |
| private boolean mMain; |
| private Object mOriginalMain; |
| private MessageHandler mMessageHandler; |
| |
| private Handler mHandler; |
| private Runnable mEmptyMessage; |
| private TestLooperManager mQueueWrapper; |
| |
| public TestableLooper(Looper l) throws Exception { |
| this(InstrumentationRegistry.getInstrumentation().acquireLooperManager(l), l); |
| } |
| |
| private TestableLooper(TestLooperManager wrapper, Looper l) throws Exception { |
| mQueueWrapper = wrapper; |
| setupQueue(l); |
| } |
| |
| private TestableLooper(Looper looper, boolean b) throws Exception { |
| setupQueue(looper); |
| } |
| |
| public Looper getLooper() { |
| return mLooper; |
| } |
| |
| private void setupQueue(Looper l) throws Exception { |
| mLooper = l; |
| mQueue = mLooper.getQueue(); |
| mHandler = new Handler(mLooper); |
| } |
| |
| public void setAsMainLooper() throws NoSuchFieldException, IllegalAccessException { |
| mMain = true; |
| setAsMainInt(); |
| } |
| |
| private void setAsMainInt() throws NoSuchFieldException, IllegalAccessException { |
| Field field = mLooper.getClass().getDeclaredField("sMainLooper"); |
| field.setAccessible(true); |
| if (mOriginalMain == null) { |
| mOriginalMain = field.get(null); |
| } |
| field.set(null, mLooper); |
| } |
| |
| /** |
| * Must be called if setAsMainLooper is called to restore the main looper when the |
| * test is complete, otherwise the main looper will not be available for any subsequent |
| * tests. |
| */ |
| public void destroy() throws NoSuchFieldException, IllegalAccessException { |
| mQueueWrapper.release(); |
| if (mMain && mOriginalMain != null) { |
| Field field = mLooper.getClass().getDeclaredField("sMainLooper"); |
| field.setAccessible(true); |
| field.set(null, mOriginalMain); |
| mOriginalMain = null; |
| } |
| } |
| |
| public void setMessageHandler(MessageHandler handler) { |
| mMessageHandler = handler; |
| } |
| |
| /** |
| * Parse num messages from the message queue. |
| * |
| * @param num Number of messages to parse |
| */ |
| public int processMessages(int num) { |
| for (int i = 0; i < num; i++) { |
| if (!parseMessageInt()) { |
| return i + 1; |
| } |
| } |
| return num; |
| } |
| |
| public void processAllMessages() { |
| while (processQueuedMessages() != 0) ; |
| } |
| |
| private int processQueuedMessages() { |
| int count = 0; |
| mEmptyMessage = () -> { }; |
| mHandler.post(mEmptyMessage); |
| waitForMessage(mQueueWrapper, mHandler, mEmptyMessage); |
| while (parseMessageInt()) count++; |
| return count; |
| } |
| |
| private boolean parseMessageInt() { |
| try { |
| Message result = mQueueWrapper.next(); |
| if (result != null) { |
| // This is a break message. |
| if (result.getCallback() == mEmptyMessage) { |
| mQueueWrapper.recycle(result); |
| return false; |
| } |
| |
| if (mMessageHandler != null) { |
| if (mMessageHandler.onMessageHandled(result)) { |
| result.getTarget().dispatchMessage(result); |
| mQueueWrapper.recycle(result); |
| } else { |
| mQueueWrapper.recycle(result); |
| // Message handler indicated it doesn't want us to continue. |
| return false; |
| } |
| } else { |
| result.getTarget().dispatchMessage(result); |
| mQueueWrapper.recycle(result); |
| } |
| } else { |
| // No messages, don't continue parsing |
| return false; |
| } |
| } catch (Exception e) { |
| throw new RuntimeException(e); |
| } |
| return true; |
| } |
| |
| /** |
| * Runs an executable with myLooper set and processes all messages added. |
| */ |
| public void runWithLooper(RunnableWithException runnable) throws Exception { |
| new Handler(getLooper()).post(() -> { |
| try { |
| runnable.run(); |
| } catch (Exception e) { |
| throw new RuntimeException(e); |
| } |
| }); |
| processAllMessages(); |
| } |
| |
| public interface RunnableWithException { |
| void run() throws Exception; |
| } |
| |
| @Retention(RetentionPolicy.RUNTIME) |
| @Target({ElementType.METHOD, ElementType.TYPE}) |
| public @interface RunWithLooper { |
| boolean setAsMainLooper() default false; |
| } |
| |
| private static void waitForMessage(TestLooperManager queueWrapper, Handler handler, |
| Runnable execute) { |
| for (int i = 0; i < 10; i++) { |
| if (!queueWrapper.hasMessages(handler, null, execute)) { |
| try { |
| Thread.sleep(1); |
| } catch (InterruptedException e) { |
| } |
| } |
| } |
| if (!queueWrapper.hasMessages(handler, null, execute)) { |
| throw new RuntimeException("Message didn't queue..."); |
| } |
| } |
| |
| private static final Map<Object, TestableLooper> sLoopers = new ArrayMap<>(); |
| |
| public static TestableLooper get(Object test) { |
| return sLoopers.get(test); |
| } |
| |
| public static class LooperFrameworkMethod extends FrameworkMethod { |
| private HandlerThread mHandlerThread; |
| |
| private final TestableLooper mTestableLooper; |
| private final Looper mLooper; |
| private final Handler mHandler; |
| |
| public LooperFrameworkMethod(FrameworkMethod base, boolean setAsMain, Object test) { |
| super(base.getMethod()); |
| try { |
| mLooper = setAsMain ? Looper.getMainLooper() : createLooper(); |
| mTestableLooper = new TestableLooper(mLooper, false); |
| } catch (Exception e) { |
| throw new RuntimeException(e); |
| } |
| sLoopers.put(test, mTestableLooper); |
| mHandler = new Handler(mLooper); |
| } |
| |
| public LooperFrameworkMethod(TestableLooper other, FrameworkMethod base) { |
| super(base.getMethod()); |
| mLooper = other.mLooper; |
| mTestableLooper = other; |
| mHandler = new Handler(mLooper); |
| } |
| |
| public static FrameworkMethod get(FrameworkMethod base, boolean setAsMain, Object test) { |
| if (sLoopers.containsKey(test)) { |
| return new LooperFrameworkMethod(sLoopers.get(test), base); |
| } |
| return new LooperFrameworkMethod(base, setAsMain, test); |
| } |
| |
| @Override |
| public Object invokeExplosively(Object target, Object... params) throws Throwable { |
| if (Looper.myLooper() == mLooper) { |
| // Already on the right thread from another statement, just execute then. |
| return super.invokeExplosively(target, params); |
| } |
| boolean set = mTestableLooper.mQueueWrapper == null; |
| if (set) { |
| mTestableLooper.mQueueWrapper = InstrumentationRegistry.getInstrumentation() |
| .acquireLooperManager(mLooper); |
| } |
| try { |
| Object[] ret = new Object[1]; |
| // Run the execution on the looper thread. |
| Runnable execute = () -> { |
| try { |
| ret[0] = super.invokeExplosively(target, params); |
| } catch (Throwable throwable) { |
| throw new LooperException(throwable); |
| } |
| }; |
| Message m = Message.obtain(mHandler, execute); |
| |
| // Dispatch our message. |
| try { |
| mTestableLooper.mQueueWrapper.execute(m); |
| } catch (LooperException e) { |
| throw e.getSource(); |
| } catch (RuntimeException re) { |
| // If the TestLooperManager has to post, it will wrap what it throws in a |
| // RuntimeException, make sure we grab the actual source. |
| if (re.getCause() instanceof LooperException) { |
| throw ((LooperException) re.getCause()).getSource(); |
| } else { |
| throw re.getCause(); |
| } |
| } finally { |
| m.recycle(); |
| } |
| return ret[0]; |
| } finally { |
| if (set) { |
| mTestableLooper.mQueueWrapper.release(); |
| mTestableLooper.mQueueWrapper = null; |
| } |
| } |
| } |
| |
| private Looper createLooper() { |
| // TODO: Find way to share these. |
| mHandlerThread = new HandlerThread(TestableLooper.class.getSimpleName()); |
| mHandlerThread.start(); |
| return mHandlerThread.getLooper(); |
| } |
| |
| @Override |
| protected void finalize() throws Throwable { |
| super.finalize(); |
| if (mHandlerThread != null) { |
| mHandlerThread.quit(); |
| } |
| } |
| |
| private static class LooperException extends RuntimeException { |
| private final Throwable mSource; |
| |
| public LooperException(Throwable t) { |
| mSource = t; |
| } |
| |
| public Throwable getSource() { |
| return mSource; |
| } |
| } |
| } |
| |
| public interface MessageHandler { |
| /** |
| * Return true to have the message executed and delivered to target. |
| * Return false to not execute the message and stop executing messages. |
| */ |
| boolean onMessageHandled(Message m); |
| } |
| } |