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Java classes for temporal testing and concurrency

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/*
 * Copyright (c) 2009-2010, tempus-fugit committers
 *
 * 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.code.tempusfugit.concurrency;

import org.junit.runners.BlockJUnit4ClassRunner;
import org.junit.runners.model.InitializationError;
import org.junit.runners.model.RunnerScheduler;

import java.util.concurrent.ExecutorService;
import java.util.concurrent.ThreadFactory;
import java.util.concurrent.atomic.AtomicLong;

import static com.google.code.tempusfugit.concurrency.ExecutorServiceShutdown.shutdown;
import static com.google.code.tempusfugit.temporal.Duration.seconds;
import static java.util.concurrent.Executors.newCachedThreadPool;

public class ConcurrentTestRunner extends BlockJUnit4ClassRunner {

    public ConcurrentTestRunner(Class type) throws InitializationError {
        super(type);
        setScheduler(new ConcurrentScheduler());
    }

    private static class ConcurrentScheduler implements RunnerScheduler {

        private ExecutorService executor;

        public ConcurrentScheduler() {
            executor = newCachedThreadPool(new ThreadFactory() {
                private AtomicLong count = new AtomicLong();
                public Thread newThread(Runnable runnable) {
                    return new Thread(runnable, "ConcurrentTestRunner-Thread-" + count.getAndIncrement());
                }
            });
        }

        public void schedule(Runnable childStatement) {
            executor.submit(childStatement);
        }

        public void finished() {
            shutdown(executor).waitingForCompletion(seconds(10));
        }
    }

}