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package org.junit.experimental;
import java.util.concurrent.ExecutorService;
import java.util.concurrent.Executors;
import java.util.concurrent.TimeUnit;
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 classes;
private final boolean methods;
public ParallelComputer(boolean classes, boolean methods) {
this.classes = classes;
this.methods = methods;
}
public static Computer classes() {
return new ParallelComputer(true, false);
}
public static Computer methods() {
return new ParallelComputer(false, true);
}
private static Runner parallelize(Runner runner) {
if (runner instanceof ParentRunner) {
((ParentRunner<?>) runner).setScheduler(new RunnerScheduler() {
private final ExecutorService fService = Executors.newCachedThreadPool();
public void schedule(Runnable childStatement) {
fService.submit(childStatement);
}
public void finished() {
try {
fService.shutdown();
fService.awaitTermination(Long.MAX_VALUE, TimeUnit.NANOSECONDS);
} catch (InterruptedException e) {
e.printStackTrace(System.err);
}
}
});
}
return runner;
}
@Override
public Runner getSuite(RunnerBuilder builder, java.lang.Class<?>[] classes)
throws InitializationError {
Runner suite = super.getSuite(builder, classes);
return this.classes ? parallelize(suite) : suite;
}
@Override
protected Runner getRunner(RunnerBuilder builder, Class<?> testClass)
throws Throwable {
Runner runner = super.getRunner(builder, testClass);
return methods ? parallelize(runner) : runner;
}
}
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