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/*
* 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.Bundle;
import android.os.Handler;
import android.os.Looper;
import android.os.Message;
import android.os.TestLooperManager;
import android.support.test.runner.AndroidJUnitRunner;
import android.util.Log;
import java.util.ArrayList;
/**
* Wrapper around instrumentation that spins up a TestLooperManager around
* the main looper whenever a test is not using it to attempt to stop crashes
* from stopping other tests from running.
*/
public class TestableInstrumentation extends AndroidJUnitRunner {
private static final String TAG = "TestableInstrumentation";
private static final int MAX_CRASHES = 5;
private static MainLooperManager sManager;
@Override
public void onCreate(Bundle arguments) {
if (TestableLooper.HOLD_MAIN_THREAD) {
sManager = new MainLooperManager();
Log.setWtfHandler((tag, what, system) -> {
if (system) {
Log.e(TAG, "WTF!!", what);
} else {
// These normally kill the app, but we don't want that in a test, instead we want
// it to throw.
throw new RuntimeException(what);
}
});
}
super.onCreate(arguments);
}
@Override
public void finish(int resultCode, Bundle results) {
if (TestableLooper.HOLD_MAIN_THREAD) {
sManager.destroy();
}
super.finish(resultCode, results);
}
public static void acquireMain() {
if (sManager != null) {
sManager.acquireMain();
}
}
public static void releaseMain() {
if (sManager != null) {
sManager.releaseMain();
}
}
public class MainLooperManager implements Runnable {
private final ArrayList<Throwable> mExceptions = new ArrayList<>();
private Message mStopMessage;
private final Handler mMainHandler;
private TestLooperManager mManager;
public MainLooperManager() {
mMainHandler = Handler.createAsync(Looper.getMainLooper());
startManaging();
}
@Override
public void run() {
try {
synchronized (this) {
// Let the thing starting us know we are up and ready to run.
notify();
}
while (true) {
Message m = mManager.next();
if (m == mStopMessage) {
mManager.recycle(m);
return;
}
try {
mManager.execute(m);
} catch (Throwable t) {
if (!checkStack(t) || (mExceptions.size() == MAX_CRASHES)) {
throw t;
}
mExceptions.add(t);
Log.d(TAG, "Ignoring exception to run more tests", t);
}
mManager.recycle(m);
}
} finally {
mManager.release();
synchronized (this) {
// Let the caller know we are done managing the main thread.
notify();
}
}
}
private boolean checkStack(Throwable t) {
StackTraceElement topStack = t.getStackTrace()[0];
String className = topStack.getClassName();
if (className.equals(TestLooperManager.class.getName())) {
topStack = t.getCause().getStackTrace()[0];
className = topStack.getClassName();
}
// Only interested in blocking exceptions from the app itself, not from android
// framework.
return !className.startsWith("android.")
&& !className.startsWith("com.android.internal");
}
public void destroy() {
mStopMessage.sendToTarget();
if (mExceptions.size() != 0) {
throw new RuntimeException("Exception caught during tests", mExceptions.get(0));
}
}
public void acquireMain() {
synchronized (this) {
mStopMessage.sendToTarget();
try {
wait();
} catch (InterruptedException e) {
}
}
}
public void releaseMain() {
startManaging();
}
private void startManaging() {
mStopMessage = mMainHandler.obtainMessage();
synchronized (this) {
mManager = acquireLooperManager(Looper.getMainLooper());
// This bit needs to happen on a background thread or it will hang if called
// from the same thread we are looking to block.
new Thread(() -> {
// Post a message to the main handler that will manage executing all future
// messages.
mMainHandler.post(this);
while (!mManager.hasMessages(mMainHandler, null, this));
// Lastly run the message that executes this so it can manage the main thread.
Message next = mManager.next();
// Run through messages until we reach ours.
while (next.getCallback() != this) {
mManager.execute(next);
mManager.recycle(next);
next = mManager.next();
}
mManager.execute(next);
}).start();
if (Looper.myLooper() != Looper.getMainLooper()) {
try {
wait();
} catch (InterruptedException e) {
}
}
}
}
}
}
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