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/*
 * Copyright 2002-2013 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.lang.reflect.InvocationTargetException;
import java.lang.reflect.Method;

import org.springframework.instrument.classloading.LoadTimeWeaver;
import org.springframework.util.Assert;
import org.springframework.util.ClassUtils;

/**
 * {@link LoadTimeWeaver} implementation for GlassFish's
 * {@code org.glassfish.api.deployment.InstrumentableClassLoader InstrumentableClassLoader}.
 *
 * 

As of Spring 4.0, this weaver supports GlassFish V3 and V4. * * @author Costin Leau * @author Juergen Hoeller * @since 2.0.1 */ public class GlassFishLoadTimeWeaver implements LoadTimeWeaver { private static final String INSTRUMENTABLE_LOADER_CLASS_NAME = "org.glassfish.api.deployment.InstrumentableClassLoader"; private final ClassLoader classLoader; private final Method addTransformerMethod; private final Method copyMethod; public GlassFishLoadTimeWeaver() { this(ClassUtils.getDefaultClassLoader()); } public GlassFishLoadTimeWeaver(ClassLoader classLoader) { Assert.notNull(classLoader, "ClassLoader must not be null"); Class instrumentableLoaderClass; try { instrumentableLoaderClass = classLoader.loadClass(INSTRUMENTABLE_LOADER_CLASS_NAME); } catch (ClassNotFoundException ex) { throw new IllegalStateException( "Could not initialize GlassFishLoadTimeWeaver because GlassFish API classes are not available", ex); } try { this.addTransformerMethod = instrumentableLoaderClass.getMethod("addTransformer", ClassFileTransformer.class); this.copyMethod = instrumentableLoaderClass.getMethod("copy"); } catch (Exception ex) { throw new IllegalStateException( "Could not initialize GlassFishLoadTimeWeaver because GlassFish API classes are not available", ex); } ClassLoader clazzLoader = null; // Detect transformation-aware ClassLoader by traversing the hierarchy // (as in GlassFish, Spring can be loaded by the WebappClassLoader). for (ClassLoader cl = classLoader; cl != null && clazzLoader == null; cl = cl.getParent()) { if (instrumentableLoaderClass.isInstance(cl)) { clazzLoader = cl; } } if (clazzLoader == null) { throw new IllegalArgumentException(classLoader + " and its parents are not suitable ClassLoaders: A [" + instrumentableLoaderClass.getName() + "] implementation is required."); } this.classLoader = clazzLoader; } @Override public void addTransformer(ClassFileTransformer transformer) { try { this.addTransformerMethod.invoke(this.classLoader, transformer); } catch (InvocationTargetException ex) { throw new IllegalStateException("GlassFish addTransformer method threw exception", ex.getCause()); } catch (Exception ex) { throw new IllegalStateException("Could not invoke GlassFish addTransformer method", ex); } } @Override public ClassLoader getInstrumentableClassLoader() { return this.classLoader; } @Override public ClassLoader getThrowawayClassLoader() { try { return (ClassLoader) this.copyMethod.invoke(this.classLoader); } catch (InvocationTargetException ex) { throw new IllegalStateException("GlassFish copy method threw exception", ex.getCause()); } catch (Exception ex) { throw new IllegalStateException("Could not invoke GlassFish copy method", ex); } } }





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