package org.junit.internal.requests;


import org.junit.internal.builders.AllDefaultPossibilitiesBuilder;
import org.junit.runner.Request;
import org.junit.runner.Runner;

public class ClassRequest extends Request {
	private final Class<?> fTestClass;

	private boolean fCanUseSuiteMethod;

	public ClassRequest(Class<?> testClass, boolean canUseSuiteMethod) {
		fTestClass= testClass;
		fCanUseSuiteMethod= canUseSuiteMethod;
	}

	public ClassRequest(Class<?> testClass) {
		this(testClass, true);
	}

	@Override
	public Runner getRunner() {
		return new AllDefaultPossibilitiesBuilder(fCanUseSuiteMethod).safeRunnerForClass(fTestClass);
	}
}
package org.junit.internal.requests;


import org.junit.internal.builders.AllDefaultPossibilitiesBuilder;
import org.junit.runner.Request;
import org.junit.runner.Runner;

public class ClassRequest extends Request {
	private final Object fRunnerLock = new Object();
	private final Class<?> fTestClass;
	private final boolean fCanUseSuiteMethod;
	private Runner fRunner;

	public ClassRequest(Class<?> testClass, boolean canUseSuiteMethod) {
		fTestClass= testClass;
		fCanUseSuiteMethod= canUseSuiteMethod;
	}

	public ClassRequest(Class<?> testClass) {
		this(testClass, true);
	}

	@Override
	public Runner getRunner() {
		synchronized (fRunnerLock) {
			if (fRunner == null) {
				fRunner = new AllDefaultPossibilitiesBuilder(fCanUseSuiteMethod).safeRunnerForClass(fTestClass);
			}
			return fRunner;
		}
	}
}
Make ClassRequest memoize the runner. Creating the runner can be an expensive operation. Other types of requests are written in such a way that the runner is already memoized.