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/*
 * Copyright (c) 2014 Spotify AB.
 *
 * Licensed to the Apache Software Foundation (ASF) under one
 * or more contributor license agreements.  See the NOTICE file
 * distributed with this work for additional information
 * regarding copyright ownership.  The ASF licenses this file
 * to you 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.spotify.helios;

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

import java.util.concurrent.ExecutorService;
import java.util.concurrent.Executors;
import java.util.concurrent.TimeUnit;

public class Parallelized extends BlockJUnit4ClassRunner {

  private static class ThreadPoolScheduler implements RunnerScheduler {

    private ExecutorService executor;

    public ThreadPoolScheduler() {
      String threads = System.getProperty("junit.parallel.threads", "16");
      int numThreads = Integer.parseInt(threads);
      executor = Executors.newFixedThreadPool(numThreads);
    }

    @Override
    public void finished() {
      executor.shutdown();
      try {
        executor.awaitTermination(10, TimeUnit.MINUTES);
      } catch (InterruptedException exc) {
        throw new RuntimeException(exc);
      }
    }

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

  public Parallelized(Class klass) throws Throwable {
    super(klass);
    setScheduler(new ThreadPoolScheduler());
  }
}