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Spring Framework example source code file (ConcurrencyThrottleInterceptorTests.java)

This example Spring Framework source code file (ConcurrencyThrottleInterceptorTests.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

advised, concurrencytest, concurrencythrottleinterceptor, concurrencythrottleinterceptor, derivedtestbean, itestbean, itestbean, nr_of_threads, proxyfactory, proxyfactory, testbean, thread, throwable, throwable

The Spring Framework ConcurrencyThrottleInterceptorTests.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.aop.interceptor;

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

import org.springframework.aop.framework.Advised;
import org.springframework.aop.framework.ProxyFactory;
import org.springframework.beans.DerivedTestBean;
import org.springframework.beans.ITestBean;
import org.springframework.beans.TestBean;
import org.springframework.util.SerializationTestUtils;

/**
 * @author Juergen Hoeller
 * @since 06.04.2004
 */
public class ConcurrencyThrottleInterceptorTests extends TestCase {

	protected static final Log logger = LogFactory.getLog(ConcurrencyThrottleInterceptorTests.class);

	public static final int NR_OF_THREADS = 100;

	public static final int NR_OF_ITERATIONS = 1000;


	public void testSerializable() throws Exception {
		DerivedTestBean tb = new DerivedTestBean();
		ProxyFactory proxyFactory = new ProxyFactory();
		proxyFactory.setInterfaces(new Class[] {ITestBean.class});
		ConcurrencyThrottleInterceptor cti = new ConcurrencyThrottleInterceptor();
		proxyFactory.addAdvice(cti);
		proxyFactory.setTarget(tb);
		ITestBean proxy = (ITestBean) proxyFactory.getProxy();
		proxy.getAge();

		ITestBean serializedProxy = (ITestBean) SerializationTestUtils.serializeAndDeserialize(proxy);
		Advised advised = (Advised) serializedProxy;
		ConcurrencyThrottleInterceptor serializedCti =
				(ConcurrencyThrottleInterceptor) advised.getAdvisors()[0].getAdvice();
		assertEquals(cti.getConcurrencyLimit(), serializedCti.getConcurrencyLimit());
		serializedProxy.getAge();
	}

	public void testMultipleThreadsWithLimit1() {
		testMultipleThreads(1);
	}

	public void testMultipleThreadsWithLimit10() {
		testMultipleThreads(10);
	}

	private void testMultipleThreads(int concurrencyLimit) {
		TestBean tb = new TestBean();
		ProxyFactory proxyFactory = new ProxyFactory();
		proxyFactory.setInterfaces(new Class[] {ITestBean.class});
		ConcurrencyThrottleInterceptor cti = new ConcurrencyThrottleInterceptor();
		cti.setConcurrencyLimit(concurrencyLimit);
		proxyFactory.addAdvice(cti);
		proxyFactory.setTarget(tb);
		ITestBean proxy = (ITestBean) proxyFactory.getProxy();

		Thread[] threads = new Thread[NR_OF_THREADS];
		for (int i = 0; i < NR_OF_THREADS; i++) {
			threads[i] = new ConcurrencyTest(proxy, null);
			threads[i].start();
		}
		for (int i = 0; i < NR_OF_THREADS / 10; i++) {
			try {
				Thread.sleep(5);
			}
			catch (InterruptedException ex) {
				ex.printStackTrace();
			}
			threads[i] = new ConcurrencyTest(proxy,
					i % 2 == 0 ? (Throwable) new OutOfMemoryError() : (Throwable) new IllegalStateException());
			threads[i].start();
		}
		for (int i = 0; i < NR_OF_THREADS; i++) {
			try {
				threads[i].join();
			}
			catch (InterruptedException ex) {
				ex.printStackTrace();
			}
		}
	}


	private static class ConcurrencyTest extends Thread {

		private ITestBean proxy;
		private Throwable ex;

		public ConcurrencyTest(ITestBean proxy, Throwable ex) {
			this.proxy = proxy;
			this.ex = ex;
		}

		public void run() {
			if (this.ex != null) {
				try {
					this.proxy.exceptional(this.ex);
				}
				catch (RuntimeException ex) {
					if (ex == this.ex) {
						logger.debug("Expected exception thrown", ex);
					}
					else {
						// should never happen
						ex.printStackTrace();
					}
				}
				catch (Error err) {
					if (err == this.ex) {
						logger.debug("Expected exception thrown", err);
					}
					else {
						// should never happen
						ex.printStackTrace();
					}
				}
				catch (Throwable ex) {
					// should never happen
					ex.printStackTrace();
				}
			}
			else {
				for (int i = 0; i < NR_OF_ITERATIONS; i++) {
					this.proxy.getName();
				}
			}
			logger.debug("finished");
		}
	}

}

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