001/* 002 * Copyright 2002-2017 the original author or authors. 003 * 004 * Licensed under the Apache License, Version 2.0 (the "License"); 005 * you may not use this file except in compliance with the License. 006 * You may obtain a copy of the License at 007 * 008 * https://www.apache.org/licenses/LICENSE-2.0 009 * 010 * Unless required by applicable law or agreed to in writing, software 011 * distributed under the License is distributed on an "AS IS" BASIS, 012 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. 013 * See the License for the specific language governing permissions and 014 * limitations under the License. 015 */ 016 017package org.springframework.instrument.classloading.websphere; 018 019import java.lang.instrument.ClassFileTransformer; 020 021import org.springframework.core.OverridingClassLoader; 022import org.springframework.instrument.classloading.LoadTimeWeaver; 023import org.springframework.util.Assert; 024import org.springframework.util.ClassUtils; 025 026/** 027 * {@link LoadTimeWeaver} implementation for WebSphere's instrumentable ClassLoader. 028 * Compatible with WebSphere 7 as well as 8 and 9. 029 * 030 * @author Costin Leau 031 * @since 3.1 032 */ 033public class WebSphereLoadTimeWeaver implements LoadTimeWeaver { 034 035 private final WebSphereClassLoaderAdapter classLoader; 036 037 038 /** 039 * Create a new instance of the {@link WebSphereLoadTimeWeaver} class using 040 * the default {@link ClassLoader class loader}. 041 * @see org.springframework.util.ClassUtils#getDefaultClassLoader() 042 */ 043 public WebSphereLoadTimeWeaver() { 044 this(ClassUtils.getDefaultClassLoader()); 045 } 046 047 /** 048 * Create a new instance of the {@link WebSphereLoadTimeWeaver} class using 049 * the supplied {@link ClassLoader}. 050 * @param classLoader the {@code ClassLoader} to delegate to for weaving 051 */ 052 public WebSphereLoadTimeWeaver(ClassLoader classLoader) { 053 Assert.notNull(classLoader, "ClassLoader must not be null"); 054 this.classLoader = new WebSphereClassLoaderAdapter(classLoader); 055 } 056 057 058 @Override 059 public void addTransformer(ClassFileTransformer transformer) { 060 this.classLoader.addTransformer(transformer); 061 } 062 063 @Override 064 public ClassLoader getInstrumentableClassLoader() { 065 return this.classLoader.getClassLoader(); 066 } 067 068 @Override 069 public ClassLoader getThrowawayClassLoader() { 070 return new OverridingClassLoader(this.classLoader.getClassLoader(), 071 this.classLoader.getThrowawayClassLoader()); 072 } 073 074}