Commons JXPath example source code file (StressTest.java)

This example Commons JXPath source code file (StressTest.java) is included in the DevDaily.com "Java Source Code Warehouse" project. The intent of this project is to help you "Learn Java by Example" ^TM.

Java - Commons JXPath tags/keywords

double, interrupted, jxpathcontext, stressrunnable, stresstest, testcase, thread, thread, thread_count, thread_count, thread_duration, thread_duration, throwable, throwable

The Commons JXPath StressTest.java source code

/*
 * 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.commons.jxpath.ri;

import junit.framework.TestCase;

import org.apache.commons.jxpath.JXPathContext;

/**
 * Test thread safety.
 *
 * @author Dmitri Plotnikov
 * @version $Revision: 652845 $ $Date: 2008-05-02 12:46:46 -0500 (Fri, 02 May 2008) $
 */
public class StressTest extends TestCase {
    
    private static final int THREAD_COUNT = 50;
    private static final int THREAD_DURATION = 1000;
    private static JXPathContext context;
    private static int count;
    private static Throwable exception;

    public void testThreads() throws Throwable {
        context = JXPathContext.newContext(null, new Double(100));
        Thread[] threadArray = new Thread[THREAD_COUNT];
        for (int i = 0; i < THREAD_COUNT; i++) {
            threadArray[i] = new Thread(new StressRunnable());
        }
        
        for (int i = 0; i < threadArray.length; i++) {
            threadArray[i].start();
        }

        for (int i = 0; i < threadArray.length; i++) {
            try {
                threadArray[i].join();
            }
            catch (InterruptedException e) {
                assertTrue("Interrupted", false);
            }
        }

        if (exception != null) {
            throw exception;
        }
        assertEquals("Test count", THREAD_COUNT * THREAD_DURATION, count);
    }    

    private final class StressRunnable implements Runnable {
        public void run() {
            for (int j = 0; j < THREAD_DURATION && exception == null; j++) {
                try { 
                    double random = 1 + Math.random();
                    double sum =
                        ((Double) context.getValue("/ + " + random))
                            .doubleValue();
                    assertEquals(100 + random, sum, 0.0001);
                    synchronized (context) {
                        count++;
                    }
                }                    
                catch (Throwable t) {
                    exception = t;
                }
            }
        }
    }
}