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With inspiration from other libraries
package org.junit.runner.notification;
import static java.util.Arrays.asList;
import java.util.ArrayList;
import java.util.List;
import java.util.concurrent.CopyOnWriteArrayList;
import org.junit.runner.Description;
import org.junit.runner.Result;
/**
* If you write custom runners, you may need to notify JUnit of your progress running tests.
* Do this by invoking the RunNotifier passed to your implementation of
* {@link org.junit.runner.Runner#run(RunNotifier)}. Future evolution of this class is likely to
* move {@link #fireTestRunStarted(Description)} and {@link #fireTestRunFinished(Result)}
* to a separate class since they should only be called once per run.
*
* @since 4.0
*/
public class RunNotifier {
private final List listeners = new CopyOnWriteArrayList();
private volatile boolean pleaseStop = false;
/**
* Internal use only
*/
public void addListener(RunListener listener) {
if (listener == null) {
throw new NullPointerException("Cannot add a null listener");
}
listeners.add(wrapIfNotThreadSafe(listener));
}
/**
* Internal use only
*/
public void removeListener(RunListener listener) {
if (listener == null) {
throw new NullPointerException("Cannot remove a null listener");
}
listeners.remove(wrapIfNotThreadSafe(listener));
}
/**
* Wraps the given listener with {@link SynchronizedRunListener} if
* it is not annotated with {@link RunListener.ThreadSafe}.
*/
RunListener wrapIfNotThreadSafe(RunListener listener) {
return listener.getClass().isAnnotationPresent(RunListener.ThreadSafe.class) ?
listener : new SynchronizedRunListener(listener, this);
}
private abstract class SafeNotifier {
private final List currentListeners;
SafeNotifier() {
this(listeners);
}
SafeNotifier(List currentListeners) {
this.currentListeners = currentListeners;
}
void run() {
int capacity = currentListeners.size();
ArrayList safeListeners = new ArrayList(capacity);
ArrayList failures = new ArrayList(capacity);
for (RunListener listener : currentListeners) {
try {
notifyListener(listener);
safeListeners.add(listener);
} catch (Exception e) {
failures.add(new Failure(Description.TEST_MECHANISM, e));
}
}
fireTestFailures(safeListeners, failures);
}
abstract protected void notifyListener(RunListener each) throws Exception;
}
/**
* Do not invoke.
*/
public void fireTestRunStarted(final Description description) {
new SafeNotifier() {
@Override
protected void notifyListener(RunListener each) throws Exception {
each.testRunStarted(description);
}
}.run();
}
/**
* Do not invoke.
*/
public void fireTestRunFinished(final Result result) {
new SafeNotifier() {
@Override
protected void notifyListener(RunListener each) throws Exception {
each.testRunFinished(result);
}
}.run();
}
/**
* Invoke to tell listeners that an atomic test is about to start.
*
* @param description the description of the atomic test (generally a class and method name)
* @throws StoppedByUserException thrown if a user has requested that the test run stop
*/
public void fireTestStarted(final Description description) throws StoppedByUserException {
if (pleaseStop) {
throw new StoppedByUserException();
}
new SafeNotifier() {
@Override
protected void notifyListener(RunListener each) throws Exception {
each.testStarted(description);
}
}.run();
}
/**
* Invoke to tell listeners that an atomic test failed.
*
* @param failure the description of the test that failed and the exception thrown
*/
public void fireTestFailure(Failure failure) {
fireTestFailures(listeners, asList(failure));
}
private void fireTestFailures(List listeners,
final List failures) {
if (!failures.isEmpty()) {
new SafeNotifier(listeners) {
@Override
protected void notifyListener(RunListener listener) throws Exception {
for (Failure each : failures) {
listener.testFailure(each);
}
}
}.run();
}
}
/**
* Invoke to tell listeners that an atomic test flagged that it assumed
* something false.
*
* @param failure the description of the test that failed and the
* {@link org.junit.AssumptionViolatedException} thrown
*/
public void fireTestAssumptionFailed(final Failure failure) {
new SafeNotifier() {
@Override
protected void notifyListener(RunListener each) throws Exception {
each.testAssumptionFailure(failure);
}
}.run();
}
/**
* Invoke to tell listeners that an atomic test was ignored.
*
* @param description the description of the ignored test
*/
public void fireTestIgnored(final Description description) {
new SafeNotifier() {
@Override
protected void notifyListener(RunListener each) throws Exception {
each.testIgnored(description);
}
}.run();
}
/**
* Invoke to tell listeners that an atomic test finished. Always invoke
* this method if you invoke {@link #fireTestStarted(Description)}
* as listeners are likely to expect them to come in pairs.
*
* @param description the description of the test that finished
*/
public void fireTestFinished(final Description description) {
new SafeNotifier() {
@Override
protected void notifyListener(RunListener each) throws Exception {
each.testFinished(description);
}
}.run();
}
/**
* Ask that the tests run stop before starting the next test. Phrased politely because
* the test currently running will not be interrupted. It seems a little odd to put this
* functionality here, but the RunNotifier is the only object guaranteed
* to be shared amongst the many runners involved.
*/
public void pleaseStop() {
pleaseStop = true;
}
/**
* Internal use only. The Result's listener must be first.
*/
public void addFirstListener(RunListener listener) {
if (listener == null) {
throw new NullPointerException("Cannot add a null listener");
}
listeners.add(0, wrapIfNotThreadSafe(listener));
}
}