/*
 * The Apache Software License, Version 1.1
 *
 * Copyright (c) 2002 The Apache Software Foundation.  All rights
 * reserved.
 *
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions
 * are met:
 *
 * 1. Redistributions of source code must retain the above copyright
 *    notice, this list of conditions and the following disclaimer.
 *
 * 2. Redistributions in binary form must reproduce the above copyright
 *    notice, this list of conditions and the following disclaimer in
 *    the documentation and/or other materials provided with the
 *    distribution.
 *
 * 3. The end-user documentation included with the redistribution, if
 *    any, must include the following acknowlegement:
 *       "This product includes software developed by the
 *        Apache Software Foundation (http://www.apache.org/)."
 *    Alternately, this acknowlegement may appear in the software itself,
 *    if and wherever such third-party acknowlegements normally appear.
 *
 * 4. The names "The Jakarta Project", "Jakarta-Regexp", and "Apache Software
 *    Foundation" must not be used to endorse or promote products derived
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 * 5. Products derived from this software may not be called "Apache"
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 * OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
 * SUCH DAMAGE.
 * ====================================================================
 *
 * This software consists of voluntary contributions made by many
 * individuals on behalf of the Apache Software Foundation.  For more
 * information on the Apache Software Foundation, please see
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 *
 */
package org.apache.tools.ant.taskdefs.optional.rjunit;

import junit.extensions.TestDecorator;
import junit.framework.AssertionFailedError;
import junit.framework.Test;
import junit.framework.TestResult;

/**
 * A Test decorator that allows to cancel a test if it exceeds
 * a certain time. It can be used globally or individually over
 * each testcase.
 *
 */
public class WatchdogTest extends TestDecorator {

    /** the time out delay in msecs */
    private long timeOut;

    /**
     * Create a new watchdog.
     * @param test the test to watch for
     * @param msecs the time out delay in msecs.
     */
    public WatchdogTest(Test test, long msecs) {
        super(test);
        timeOut = msecs;
    }

    public void run(TestResult result) {
        Thread worker = createWorker(result);
        worker.start();

        try {
            // wait at most the timeOut time.
            worker.join(timeOut);

            // if the thread is still alive, it must be killed.
            if (worker.isAlive()) {
                worker.interrupt();
                result.addFailure(getTest(),
                        new AssertionFailedError("Timed out after " + timeOut + "ms"));
            }
        } catch (InterruptedException e) {
            worker.interrupt();
            result.addError(getTest(), e);
            result.stop();
        }
    }

    /** create a new worker thread */
    protected Thread createWorker(final TestResult result) {
        Thread worker = new Thread("JUnit Test Worker") {
            public void run() {
                getTest().run(result);
            }
        };
        return worker;
    }

}
