Java tutorial
/**************************************************************** * Licensed to the Apache Software Foundation (ASF) under one * * or more contributor license agreements. See the NOTICE file * * distributed with this work for additional information * * regarding copyright ownership. The ASF licenses this file * * to you 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.apache.james.container.spring.lifecycle; import org.springframework.beans.BeansException; import org.springframework.beans.FatalBeanException; import org.springframework.beans.factory.BeanFactory; import org.springframework.beans.factory.BeanFactoryAware; import org.springframework.beans.factory.ListableBeanFactory; import org.springframework.beans.factory.config.BeanPostProcessor; import org.springframework.core.Ordered; import org.springframework.core.PriorityOrdered; /** * Abstract base class which BeanPostProcessors should extend if they provide an * LifeCycle handling. * * @param <T> */ public abstract class AbstractLifecycleBeanPostProcessor<T> implements BeanPostProcessor, PriorityOrdered, BeanFactoryAware { private int order = Ordered.HIGHEST_PRECEDENCE; private ListableBeanFactory factory; @Override public void setBeanFactory(BeanFactory factory) throws BeansException { this.factory = (ListableBeanFactory) factory; } /** * @see org.springframework.beans.factory.config.BeanPostProcessor * #postProcessBeforeInitialization(java.lang.Object, java.lang.String) */ @SuppressWarnings("unchecked") public final Object postProcessBeforeInitialization(Object bean, String name) throws BeansException { try { Class<T> lClass = getLifeCycleInterface(); if (lClass.isInstance(bean)) { // Check if the bean is registered in the context. // If not it was created by the container and so there // is no need to execute the callback. if (factory.containsBeanDefinition(name)) { executeLifecycleMethodBeforeInit((T) bean, name); } } } catch (Exception e) { throw new FatalBeanException("Unable to execute lifecycle method on bean" + name, e); } return bean; } /** * @see org.springframework.beans.factory.config.BeanPostProcessor * #postProcessAfterInitialization(java.lang.Object, java.lang.String) */ @SuppressWarnings("unchecked") public final Object postProcessAfterInitialization(Object bean, String name) throws BeansException { try { Class<T> lClass = getLifeCycleInterface(); if (lClass.isInstance(bean)) { // Check if the bean is registered in the context. // If not it was created by the container and so there is no // need to execute the callback. if (factory.containsBeanDefinition(name)) { executeLifecycleMethodAfterInit((T) bean, name); } } } catch (Exception e) { throw new FatalBeanException("Unable to execute lifecycle method on bean" + name, e); } return bean; } /** * Return the class which mark the lifecycle. * * @return interfaceClass */ protected abstract Class<T> getLifeCycleInterface(); /** * Method which gets executed if the bean implement the LifeCycleInterface. * Override this if you wish perform any action. Default is todo nothing * * @param bean * the actual bean * @param beanname * then name of the bean * @throws Exception */ protected abstract void executeLifecycleMethodBeforeInit(T bean, String beanname) throws Exception; /** * Method which gets executed if the bean implement the LifeCycleInterface. * Override this if you wish perform any action. Default is todo nothing * * @param bean * the actual bean * @param beanname * then name of the bean * @throws Exception */ protected abstract void executeLifecycleMethodAfterInit(T bean, String beanname) throws Exception; /** * @param order */ public void setOrder(int order) { this.order = order; } /** * @see org.springframework.core.Ordered#getOrder() */ public int getOrder() { return order; } }