Spring Framework example source code file (HotSwappableTargetSourceTests.java)

This example Spring Framework source code file (HotSwappableTargetSourceTests.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, exception, hotswappabletargetsource, hotswappabletargetsource, illegalargumentexception, illegalargumentexception, person, proxyfactory, serializableperson, serializableperson, shouldn't, sideeffectbean, sideeffectbean, xmlbeanfactory

The Spring Framework HotSwappableTargetSourceTests.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.target;

import junit.framework.TestCase;

import org.springframework.aop.framework.Advised;
import org.springframework.aop.framework.ProxyFactory;
import org.springframework.aop.interceptor.SerializableNopInterceptor;
import org.springframework.aop.interceptor.SideEffectBean;
import org.springframework.aop.support.DefaultPointcutAdvisor;
import org.springframework.beans.Person;
import org.springframework.beans.SerializablePerson;
import org.springframework.beans.factory.xml.XmlBeanFactory;
import org.springframework.core.io.ClassPathResource;
import org.springframework.util.SerializationTestUtils;

/**
 * @author Rod Johnson
 */
public class HotSwappableTargetSourceTests extends TestCase {

	/** Initial count value set in bean factory XML */
	private static final int INITIAL_COUNT = 10;

	private XmlBeanFactory beanFactory;
	
	protected void setUp() throws Exception {
		this.beanFactory = new XmlBeanFactory(new ClassPathResource("hotSwapTests.xml", getClass()));
	}
	
	/**
	 * We must simulate container shutdown, which should clear threads.
	 */
	protected void tearDown() {
		// Will call pool.close()
		this.beanFactory.destroySingletons();
	}

	/**
	 * Check it works like a normal invoker
	 *
	 */
	public void testBasicFunctionality() {
		SideEffectBean target1 = (SideEffectBean) beanFactory.getBean("target1");
		SideEffectBean proxied = (SideEffectBean) beanFactory.getBean("swappable");
		assertEquals(INITIAL_COUNT, proxied.getCount() );
		proxied.doWork();
		assertEquals(INITIAL_COUNT + 1, proxied.getCount() );
		
		proxied = (SideEffectBean) beanFactory.getBean("swappable");
		proxied.doWork();
		assertEquals(INITIAL_COUNT + 2, proxied.getCount() );
	}
	
	public void testValidSwaps() {
		SideEffectBean target1 = (SideEffectBean) beanFactory.getBean("target1");
		SideEffectBean target2 = (SideEffectBean) beanFactory.getBean("target2");
		
		SideEffectBean proxied = (SideEffectBean) beanFactory.getBean("swappable");
	//	assertEquals(target1, ((Advised) proxied).getTarget());
		assertEquals(target1.getCount(), proxied.getCount() );
		proxied.doWork();
		assertEquals(INITIAL_COUNT + 1, proxied.getCount() );
	
		HotSwappableTargetSource swapper = (HotSwappableTargetSource) beanFactory.getBean("swapper");
		Object old = swapper.swap(target2);
		assertEquals("Correct old target was returned", target1, old);
		
		// TODO should be able to make this assertion: need to fix target handling
		// in AdvisedSupport
		//assertEquals(target2, ((Advised) proxied).getTarget());
		
		assertEquals(20, proxied.getCount());
		proxied.doWork();
		assertEquals(21, target2.getCount());
		
		// Swap it back
		swapper.swap(target1);
		assertEquals(target1.getCount(), proxied.getCount());
	}
	
	
	/**
	 * 
	 * @param invalid
	 * @return the message
	 */
	private IllegalArgumentException testRejectsSwapToInvalidValue(Object invalid) {
		HotSwappableTargetSource swapper = (HotSwappableTargetSource) beanFactory.getBean("swapper");
		IllegalArgumentException aopex = null;
		try {
			swapper.swap(invalid);
			fail("Shouldn't be able to swap to invalid value [" + invalid + "]");
		}
		catch (IllegalArgumentException ex) {
			// Ok
			aopex = ex;
		}
		
		// It shouldn't be corrupted, it should still work
		testBasicFunctionality();
		return aopex;
	}
	
	public void testRejectsSwapToNull() {
		IllegalArgumentException ex = testRejectsSwapToInvalidValue(null);
		assertTrue(ex.getMessage().indexOf("null") != -1);
	}
	
	// TODO test reject swap to wrong interface or class?
	// how to decide what's valid?
	
	
	public void testSerialization() throws Exception {
		SerializablePerson sp1 = new SerializablePerson();
		sp1.setName("Tony");
		SerializablePerson sp2 = new SerializablePerson();
		sp1.setName("Gordon");
		
		HotSwappableTargetSource hts = new HotSwappableTargetSource(sp1);
		ProxyFactory pf = new ProxyFactory();
		pf.addInterface(Person.class);
		pf.setTargetSource(hts);
		pf.addAdvisor(new DefaultPointcutAdvisor(new SerializableNopInterceptor()));
		Person p = (Person) pf.getProxy();
		
		assertEquals(sp1.getName(), p.getName());
		hts.swap(sp2);
		assertEquals(sp2.getName(), p.getName());
		
		p = (Person) SerializationTestUtils.serializeAndDeserialize(p);
		// We need to get a reference to the client-side targetsource
		hts = (HotSwappableTargetSource) ((Advised) p).getTargetSource();
		assertEquals(sp2.getName(), p.getName());
		hts.swap(sp1);
		assertEquals(sp1.getName(), p.getName());
		
	}
}