org.specrunner.junit.ConcurrentRunnerScheduler Maven / Gradle / Ivy

Go to download
/*
    SpecRunner - Acceptance Test Driven Development Tool
    Copyright (C) 2011-2015  Thiago Santos

    This program is free software: you can redistribute it and/or modify
    it under the terms of the GNU General Public License as published by
    the Free Software Foundation, either version 3 of the License, or
    (at your option) any later version.

    This program is distributed in the hope that it will be useful,
    but WITHOUT ANY WARRANTY; without even the implied warranty of
    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
    GNU General Public License for more details.

    You should have received a copy of the GNU General Public License
    along with this program.  If not, see 
 */
package org.specrunner.junit;

import java.util.LinkedList;
import java.util.Queue;
import java.util.concurrent.CompletionService;
import java.util.concurrent.ExecutorCompletionService;
import java.util.concurrent.ExecutorService;
import java.util.concurrent.Executors;
import java.util.concurrent.Future;

import org.junit.runners.model.RunnerScheduler;

/**
 * Scheduler for concurrent runners.
 * 
 * @author Mathieu Carbou ([email protected])
 * @author Thiago Santos
 * 
 */
public class ConcurrentRunnerScheduler implements RunnerScheduler {
    /**
     * Thread creation ration.
     */
    public static final double RATE = 1.5;

    /**
     * Executor service.
     */
    protected final ExecutorService executorService;
    /**
     * Completion service.
     */
    protected final CompletionService completionService;
    /**
     * Future tasks.
     */
    protected final Queue> tasks = new LinkedList>();

    /**
     * Default constructor.
     * 
     * @param klass
     *            The target class test.
     */
    public ConcurrentRunnerScheduler(Class klass) {
        executorService = Executors.newFixedThreadPool(klass.isAnnotationPresent(Concurrent.class) ? klass.getAnnotation(Concurrent.class).threads() : (int) (Runtime.getRuntime().availableProcessors() * RATE), new NamedFactory(klass.getSimpleName()));
        completionService = new ExecutorCompletionService(executorService);
    }

    @Override
    public void schedule(Runnable childStatement) {
        tasks.offer(completionService.submit(childStatement, Integer.valueOf(0)));
    }

    @Override
    public void finished() {
        try {
            while (!tasks.isEmpty()) {
                tasks.remove(completionService.take());
            }
        } catch (InterruptedException e) {
            Thread.currentThread().interrupt();
        } finally {
            while (!tasks.isEmpty()) {
                tasks.poll().cancel(true);
            }
            executorService.shutdownNow();
        }
    }
}