001/* 002 * Copyright 2002-2012 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.remoting.support; 018 019import org.apache.commons.logging.Log; 020import org.apache.commons.logging.LogFactory; 021 022import org.springframework.beans.factory.BeanClassLoaderAware; 023import org.springframework.util.ClassUtils; 024 025/** 026 * Generic support base class for remote accessor and exporters, 027 * providing common bean ClassLoader handling. 028 * 029 * @author Juergen Hoeller 030 * @since 2.5.2 031 */ 032public abstract class RemotingSupport implements BeanClassLoaderAware { 033 034 /** Logger available to subclasses */ 035 protected final Log logger = LogFactory.getLog(getClass()); 036 037 private ClassLoader beanClassLoader = ClassUtils.getDefaultClassLoader(); 038 039 040 @Override 041 public void setBeanClassLoader(ClassLoader classLoader) { 042 this.beanClassLoader = classLoader; 043 } 044 045 /** 046 * Return the ClassLoader that this accessor operates in, 047 * to be used for deserializing and for generating proxies. 048 */ 049 protected ClassLoader getBeanClassLoader() { 050 return this.beanClassLoader; 051 } 052 053 054 /** 055 * Override the thread context ClassLoader with the environment's bean ClassLoader 056 * if necessary, i.e. if the bean ClassLoader is not equivalent to the thread 057 * context ClassLoader already. 058 * @return the original thread context ClassLoader, or {@code null} if not overridden 059 */ 060 protected ClassLoader overrideThreadContextClassLoader() { 061 return ClassUtils.overrideThreadContextClassLoader(getBeanClassLoader()); 062 } 063 064 /** 065 * Reset the original thread context ClassLoader if necessary. 066 * @param original the original thread context ClassLoader, 067 * or {@code null} if not overridden (and hence nothing to reset) 068 */ 069 protected void resetThreadContextClassLoader(ClassLoader original) { 070 if (original != null) { 071 Thread.currentThread().setContextClassLoader(original); 072 } 073 } 074 075}