001/* 002 * Copyright 2002-2016 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.weblogic; 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 WebLogic's instrumentable 029 * ClassLoader. 030 * 031 * <p><b>NOTE:</b> Requires BEA WebLogic version 10 or higher. 032 * 033 * @author Costin Leau 034 * @author Juergen Hoeller 035 * @since 2.5 036 */ 037public class WebLogicLoadTimeWeaver implements LoadTimeWeaver { 038 039 private final WebLogicClassLoaderAdapter classLoader; 040 041 042 /** 043 * Creates a new instance of the {@link WebLogicLoadTimeWeaver} class using 044 * the default {@link ClassLoader class loader}. 045 * @see org.springframework.util.ClassUtils#getDefaultClassLoader() 046 */ 047 public WebLogicLoadTimeWeaver() { 048 this(ClassUtils.getDefaultClassLoader()); 049 } 050 051 /** 052 * Creates a new instance of the {@link WebLogicLoadTimeWeaver} class using 053 * the supplied {@link ClassLoader}. 054 * @param classLoader the {@code ClassLoader} to delegate to for weaving 055 */ 056 public WebLogicLoadTimeWeaver(@Nullable ClassLoader classLoader) { 057 Assert.notNull(classLoader, "ClassLoader must not be null"); 058 this.classLoader = new WebLogicClassLoaderAdapter(classLoader); 059 } 060 061 062 @Override 063 public void addTransformer(ClassFileTransformer transformer) { 064 this.classLoader.addTransformer(transformer); 065 } 066 067 @Override 068 public ClassLoader getInstrumentableClassLoader() { 069 return this.classLoader.getClassLoader(); 070 } 071 072 @Override 073 public ClassLoader getThrowawayClassLoader() { 074 return new OverridingClassLoader(this.classLoader.getClassLoader(), 075 this.classLoader.getThrowawayClassLoader()); 076 } 077 078}