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/*
 * 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;

import java.lang.instrument.ClassFileTransformer;
import java.lang.instrument.Instrumentation;

import org.springframework.instrument.InstrumentationSavingAgent;
import org.springframework.util.Assert;
import org.springframework.util.ClassUtils;

/**
 * Load time weaver relying on Instrumentation.
 * Start with java agent, with JVM options like:
 * 
 * -javaagent:path/to/spring-agent.jar
 * 
 * where spring-agent.jar is a JAR file
 * containing the InstrumentationSavingAgent class.
 *
 * 

In Eclipse, for example, set the Run configuration's JVM * args to be of the form: * * -javaagent:${project_loc}/lib/spring-agent.jar * * * @author Rod Johnson * @since 2.0 * @see InstrumentationSavingAgent */ public class InstrumentationLoadTimeWeaver implements LoadTimeWeaver { public void addTransformer(ClassFileTransformer transformer) { Assert.notNull(transformer, "Transformer must not be null"); Instrumentation instrumentation = InstrumentationSavingAgent.getInstrumentation(); if (instrumentation == null) { throw new IllegalStateException( "Must start with Java agent to use InstrumentationLoadTimeWeaver. See Spring documentation."); } instrumentation.addTransformer(transformer); } /** * We have the ability to weave the current class loader when starting the * JVM in this way, so the instrumentable class loader will always be the * current loader. */ public ClassLoader getInstrumentableClassLoader() { return ClassUtils.getDefaultClassLoader(); } /** * This implementation always returns a SimpleThrowawayClassLoader. * @see SimpleThrowawayClassLoader */ public ClassLoader getThrowawayClassLoader() { return new SimpleThrowawayClassLoader(getInstrumentableClassLoader()); } }





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