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// Copyright 2012 The Bazel Authors. All Rights Reserved.
//
// 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 com.google.testing.junit.runner.internal.junit4;
import com.google.testing.junit.junit4.runner.MemoizingRequest;
import com.google.testing.junit.junit4.runner.RunNotifierWrapper;
import javax.inject.Inject;
import javax.inject.Singleton;
import org.junit.runner.Description;
import org.junit.runner.Request;
import org.junit.runner.Runner;
import org.junit.runner.notification.RunNotifier;
import org.junit.runner.notification.StoppedByUserException;
/**
* Creates requests that can be cancelled.
*/
@Singleton
public class CancellableRequestFactory {
private boolean requestCreated;
private volatile ThreadSafeRunNotifier currentNotifier;
private volatile boolean cancelRequested = false;
@Inject
public CancellableRequestFactory() {}
/**
* Creates a request that can be cancelled. Can only be called once.
*
* @param delegate request to wrap
*/
public Request createRequest(Request delegate) {
if (requestCreated) {
throw new IllegalStateException("a request was already created");
}
return new MemoizingRequest(delegate) {
@Override
protected Runner createRunner(Request delegate) {
return new CancellableRunner(delegate.getRunner());
}
};
}
/**
* Cancels the request created by this request factory.
*/
public void cancelRun() {
cancelRequested = true;
RunNotifier notifier = currentNotifier;
if (notifier != null) {
notifier.pleaseStop();
}
}
private class CancellableRunner extends Runner {
private final Runner delegate;
public CancellableRunner(Runner delegate) {
this.delegate = delegate;
}
@Override
public Description getDescription() {
return delegate.getDescription();
}
@Override
public void run(RunNotifier notifier) {
currentNotifier = new ThreadSafeRunNotifier(notifier);
if (cancelRequested) {
currentNotifier.pleaseStop();
}
try {
delegate.run(currentNotifier);
} catch (StoppedByUserException e) {
if (cancelRequested) {
throw new RuntimeException("Test run interrupted", e);
}
throw e;
}
}
}
private static class ThreadSafeRunNotifier extends RunNotifierWrapper {
private volatile boolean stopRequested;
public ThreadSafeRunNotifier(RunNotifier delegate) {
super(delegate);
}
/**
* {@inheritDoc}<p>
*
* The implementation is almost an exact copy of the version in
* {@code RunNotifier} but is thread-safe.
*/
@Override
public void fireTestStarted(Description description) throws StoppedByUserException {
if (stopRequested) {
throw new StoppedByUserException();
}
getDelegate().fireTestStarted(description);
}
/**
* {@inheritDoc}<p>
*
* This method is thread-safe.
*/
@Override
public void pleaseStop() {
stopRequested = true;
}
}
}
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