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package org.junit.experimental;
import java.util.ArrayList;
import java.util.List;
import java.util.concurrent.Callable;
import java.util.concurrent.ExecutorService;
import java.util.concurrent.Executors;
import java.util.concurrent.Future;
import org.junit.runner.Computer;
import org.junit.runner.Runner;
import org.junit.runners.ParentRunner;
import org.junit.runners.model.InitializationError;
import org.junit.runners.model.RunnerBuilder;
import org.junit.runners.model.RunnerScheduler;
public class ParallelComputer extends Computer {
private final boolean fClasses;
private final boolean fMethods;
public ParallelComputer(boolean classes, boolean methods) {
fClasses= classes;
fMethods= methods;
}
public static Computer classes() {
return new ParallelComputer(true, false);
}
public static Computer methods() {
return new ParallelComputer(false, true);
}
private static <T> Runner parallelize(Runner runner) {
if (runner instanceof ParentRunner<?>) {
((ParentRunner<?>) runner).setScheduler(new RunnerScheduler() {
private final List<Future<Object>> fResults= new ArrayList<Future<Object>>();
private final ExecutorService fService= Executors
.newCachedThreadPool();
public void schedule(final Runnable childStatement) {
fResults.add(fService.submit(new Callable<Object>() {
public Object call() throws Exception {
childStatement.run();
return null;
}
}));
}
public void finished() {
for (Future<Object> each : fResults)
try {
each.get();
} catch (Exception e) {
e.printStackTrace();
}
}
});
}
return runner;
}
@Override
public Runner getSuite(RunnerBuilder builder, java.lang.Class<?>[] classes)
throws InitializationError {
Runner suite= super.getSuite(builder, classes);
return fClasses ? parallelize(suite) : suite;
}
@Override
protected Runner getRunner(RunnerBuilder builder, Class<?> testClass)
throws Throwable {
Runner runner= super.getRunner(builder, testClass);
return fMethods ? parallelize(runner) : runner;
}
}
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