Spring Framework example source code file (GlassFishLoadTimeWeaverTests.java)

This example Spring Framework source code file (GlassFishLoadTimeWeaverTests.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

classfiletransformer, classloader, classloader, dummyinstrumentableclassloader, dummyinstrumentableclassloader, exception, glassfishloadtimeweaver, instrumentableclassloader, net, network, object, security, testcase, url, url, urlclassloader, urlclassloader, util

The Spring Framework GlassFishLoadTimeWeaverTests.java source code

/*
 * Copyright 2002-2006 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.instrument.classloading.glassfish;

import java.lang.instrument.ClassFileTransformer;
import java.net.URL;
import java.net.URLClassLoader;
import java.security.SecureClassLoader;
import java.util.ArrayList;
import java.util.Arrays;
import java.util.List;

import javax.persistence.spi.ClassTransformer;

import com.sun.enterprise.loader.InstrumentableClassLoader;
import junit.framework.TestCase;
import org.easymock.ArgumentsMatcher;
import org.easymock.MockControl;

import org.springframework.instrument.classloading.LoadTimeWeaver;

public class GlassFishLoadTimeWeaverTests extends TestCase {

	private MockControl loaderCtrl;
	private InstrumentableClassLoader loader;
	private LoadTimeWeaver ltw;

	private class DummyInstrumentableClassLoader extends SecureClassLoader implements InstrumentableClassLoader {

		public DummyInstrumentableClassLoader() {
			super();
		}

		public DummyInstrumentableClassLoader(ClassLoader parent) {
			super(parent);
		}

		private List<ClassTransformer> transformers = new ArrayList();

		public void addTransformer(ClassTransformer transformer) {
			transformers.add(transformer);
		}

		public ClassLoader copy() {
			return new DummyInstrumentableClassLoader();
		}
	}

	protected void setUp() throws Exception {
		loaderCtrl = MockControl.createControl(InstrumentableClassLoader.class);
		loader = (InstrumentableClassLoader) loaderCtrl.getMock();
		loaderCtrl.replay();

		ltw = new GlassFishLoadTimeWeaver() {
			@Override
			protected InstrumentableClassLoader determineClassLoader(ClassLoader cl) {
				return loader;
			}
		};
	}

	protected void tearDown() throws Exception {
		loaderCtrl.verify();
		ltw = null;
	}

	public void testGlassFishLoadTimeWeaver() {
		try {
			ltw = new GlassFishLoadTimeWeaver();
			fail("expected exception");
		}
		catch (IllegalArgumentException ex) {
			// expected
		}

	}

	public void testGlassFishLoadTimeWeaverClassLoader() {
		try {
			ltw = new GlassFishLoadTimeWeaver(null);
			fail("expected exception");
		}
		catch (RuntimeException e) {
			// expected
		}

		ClassLoader cl1 = new URLClassLoader(new URL[0]);
		ClassLoader cl2 = new URLClassLoader(new URL[0], cl1);
		ClassLoader cl3 = new DummyInstrumentableClassLoader(cl2);
		ClassLoader cl4 = new URLClassLoader(new URL[0], cl3);

		ltw = new GlassFishLoadTimeWeaver(cl4);
		assertSame(cl3, ltw.getInstrumentableClassLoader());

		cl1 = new URLClassLoader(new URL[0]);
		cl2 = new URLClassLoader(new URL[0], cl1);
		cl3 = new DummyInstrumentableClassLoader(cl2);
		cl4 = new DummyInstrumentableClassLoader(cl3);

		ltw = new GlassFishLoadTimeWeaver(cl4);
		assertSame(cl4, ltw.getInstrumentableClassLoader());
	}

	public void testAddTransformer() {
		ClassFileTransformer transformer = (ClassFileTransformer) MockControl.createNiceControl(
				ClassFileTransformer.class).getMock();
		loaderCtrl.reset();
		loader.addTransformer(new ClassTransformerAdapter(transformer));
		loaderCtrl.setMatcher(new ArgumentsMatcher() {

			public boolean matches(Object[] arg0, Object[] arg1) {
				for (int i = 0; i < arg0.length; i++) {
					if (arg0 != null && arg0.getClass() != arg1.getClass())
						return false;
				}
				return true;
			}

			public String toString(Object[] arg0) {
				return Arrays.toString(arg0);
			}

		});

		loaderCtrl.replay();

		ltw.addTransformer(transformer);
	}

	public void testGetThrowawayClassLoader() {
		loaderCtrl.reset();
		ClassLoader cl = new URLClassLoader(new URL[0]);
		loaderCtrl.expectAndReturn(loader.copy(), cl);
		loaderCtrl.replay();

		assertSame(ltw.getThrowawayClassLoader(), cl);
	}

}