Spring Framework example source code file (ConcurrentBeanWrapperTests.java)

This example Spring Framework source code file (ConcurrentBeanWrapperTests.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 - Spring Framework tags/keywords

beanwrapperimpl, bytearrayoutputstream, concurrentbeanwrappertests, io, ioexception, properties, properties, system, testbean, testbean, testrun, testrun, thread, thread, throwable, util

The Spring Framework ConcurrentBeanWrapperTests.java source code

/*
 * Copyright 2002-2005 the original author or authors.
 * 
 * Licensed 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.springframework.beans;

import java.io.ByteArrayOutputStream;
import java.io.IOException;
import java.util.Collections;
import java.util.HashSet;
import java.util.Iterator;
import java.util.Properties;
import java.util.Set;

import junit.framework.TestCase;
import org.apache.commons.logging.Log;
import org.apache.commons.logging.LogFactory;

/**
 * @author Guillaume Poirier
 * @author Juergen Hoeller
 * @since 08.03.2004
 */
public class ConcurrentBeanWrapperTests extends TestCase {

	private final Log logger = LogFactory.getLog(getClass());

	private Set set = Collections.synchronizedSet(new HashSet());

	private Throwable ex = null;

	public void testSingleThread() {
		for (int i = 0; i < 100; i++) {
			performSet();
		}
	}

	public void testConcurrent() {
		for (int i = 0; i < 10; i++) {
			TestRun run = new TestRun(this);
			set.add(run);
			Thread t = new Thread(run);
			t.setDaemon(true);
			t.start();
		}
		logger.info("Thread creation over, " + set.size() + " still active.");
		synchronized (this) {
			while (!set.isEmpty() && ex == null) {
				try {
					wait();
				}
				catch (InterruptedException e) {
					logger.info(e.toString());
				}
				logger.info(set.size() + " threads still active.");
			}
		}
		if (ex != null) {
			fail(ex.getMessage());
		}
	}

	private static void performSet() {
		TestBean bean = new TestBean();

		Properties p = (Properties) System.getProperties().clone();

		assertTrue("The System properties must not be empty", p.size() != 0);

		for (Iterator i = p.entrySet().iterator(); i.hasNext();) {
			i.next();
			if (Math.random() > 0.9) {
				i.remove();
			}
		}

		ByteArrayOutputStream buffer = new ByteArrayOutputStream();
		try {
			p.store(buffer, null);
		}
		catch (IOException e) {
			// ByteArrayOutputStream does not throw
			// any IOException
		}
		String value = new String(buffer.toByteArray());

		BeanWrapperImpl wrapper = new BeanWrapperImpl(bean);
		wrapper.setPropertyValue("properties", value);
		assertEquals(p, bean.getProperties());
	}


	private static class TestRun implements Runnable {

		private ConcurrentBeanWrapperTests test;

		public TestRun(ConcurrentBeanWrapperTests test) {
			this.test = test;
		}

		public void run() {
			try {
				for (int i = 0; i < 100; i++) {
					performSet();
				}
			}
			catch (Throwable e) {
				test.ex = e;
			}
			finally {
				synchronized (test) {
					test.set.remove(this);
					test.notifyAll();
				}
			}
		}
	}


	private static class TestBean {

		private Properties properties;

		public Properties getProperties() {
			return properties;
		}

		public void setProperties(Properties properties) {
			this.properties = properties;
		}
	}

}