/*
 * 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 org.apache.maven.surefire.junitcore;

import java.util.ArrayList;
import java.util.Collections;
import java.util.List;
import java.util.concurrent.ExecutionException;
import java.util.concurrent.ExecutorService;
import java.util.concurrent.Executors;
import java.util.concurrent.Future;

import org.junit.runners.model.RunnerScheduler;

/**
 * Since SUREFIRE 2.18 this class is deprecated.
 * Please use {@link org.apache.maven.surefire.junitcore.pc.ParallelComputerBuilder} instead.
 *
 * @author <a href="mailto:kristian@zenior.no">Kristian Rosenvold</a>
 */
@Deprecated
public class AsynchronousRunner implements RunnerScheduler {
    private final List<Future<Object>> futures = Collections.synchronizedList(new ArrayList<>());

    private final ExecutorService fService;

    public AsynchronousRunner(ExecutorService fService) {
        this.fService = fService;
    }

    @Override
    public void schedule(final Runnable childStatement) {
        futures.add(fService.submit(Executors.callable(childStatement)));
    }

    @Override
    public void finished() {
        try {
            waitForCompletion();
        } catch (ExecutionException e) {
            throw new RuntimeException(e);
        }
    }

    public void waitForCompletion() throws ExecutionException {
        for (Future<Object> each : futures) {
            try {
                each.get();
            } catch (InterruptedException e) {
                throw new RuntimeException(e);
            }
        }
    }
}
