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.lang.Nullable; 024import org.springframework.util.Assert; 025import org.springframework.util.ClassUtils; 026 027/** 028 * {@link LoadTimeWeaver} implementation for WebSphere's instrumentable ClassLoader. 029 * Compatible with WebSphere 7 as well as 8 and 9. 030 * 031 * @author Costin Leau 032 * @since 3.1 033 */ 034public class WebSphereLoadTimeWeaver implements LoadTimeWeaver { 035 036 private final WebSphereClassLoaderAdapter classLoader; 037 038 039 /** 040 * Create a new instance of the {@link WebSphereLoadTimeWeaver} class using 041 * the default {@link ClassLoader class loader}. 042 * @see org.springframework.util.ClassUtils#getDefaultClassLoader() 043 */ 044 public WebSphereLoadTimeWeaver() { 045 this(ClassUtils.getDefaultClassLoader()); 046 } 047 048 /** 049 * Create a new instance of the {@link WebSphereLoadTimeWeaver} class using 050 * the supplied {@link ClassLoader}. 051 * @param classLoader the {@code ClassLoader} to delegate to for weaving 052 */ 053 public WebSphereLoadTimeWeaver(@Nullable ClassLoader classLoader) { 054 Assert.notNull(classLoader, "ClassLoader must not be null"); 055 this.classLoader = new WebSphereClassLoaderAdapter(classLoader); 056 } 057 058 059 @Override 060 public void addTransformer(ClassFileTransformer transformer) { 061 this.classLoader.addTransformer(transformer); 062 } 063 064 @Override 065 public ClassLoader getInstrumentableClassLoader() { 066 return this.classLoader.getClassLoader(); 067 } 068 069 @Override 070 public ClassLoader getThrowawayClassLoader() { 071 return new OverridingClassLoader(this.classLoader.getClassLoader(), 072 this.classLoader.getThrowawayClassLoader()); 073 } 074 075}