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.axis2.jaxws.lifecycle; import org.apache.axis2.jaxws.i18n.Messages; import org.apache.axis2.java.security.AccessController; import org.apache.commons.logging.Log; import org.apache.commons.logging.LogFactory; import javax.annotation.PostConstruct; import javax.annotation.PreDestroy; import java.lang.annotation.Annotation; import java.lang.reflect.InvocationTargetException; import java.lang.reflect.Method; import java.security.PrivilegedAction; import java.security.PrivilegedExceptionAction; import java.security.PrivilegedActionException; public abstract class BaseLifecycleManager { private static final Log log = LogFactory.getLog(BaseLifecycleManager.class); protected Object instance; public void invokePostConstruct() throws LifecycleException { if (instance == null) { throw new LifecycleException(Messages.getMessage("EndpointLifecycleManagerImplErr1")); } Method method = getPostConstructMethod(); if (method != null) { invokePostConstruct(method); } } protected void invokePostConstruct(final Method method) throws LifecycleException { if (log.isDebugEnabled()) { log.debug("Invoking Method with @PostConstruct annotation"); } /* * As per JSR-250 pre destroy and post construct can be * public, protected, private or default encapsulation. * I will check and make sure the methods are accessible * before we invoke them. * */ try { AccessController.doPrivileged(new PrivilegedExceptionAction() { public Object run() throws InvocationTargetException, IllegalAccessException { if (!method.isAccessible()) { method.setAccessible(true); } return null; } }); } catch (PrivilegedActionException e) { throw new LifecycleException(e.getException()); } invokeMethod(method, null); if (log.isDebugEnabled()) { log.debug("Completed invoke on Method with @PostConstruct annotation"); } } public void invokePreDestroy() throws LifecycleException { if (instance == null) { throw new LifecycleException(Messages.getMessage("EndpointLifecycleManagerImplErr1")); } Method method = getPreDestroyMethod(); if (method != null) { invokePreDestroy(method); } } protected void invokePreDestroy(Method method) throws LifecycleException { if (log.isDebugEnabled()) { log.debug("Invoking Method with @PreDestroy annotation"); } invokeMethod(method, null); if (log.isDebugEnabled()) { log.debug("Completed invoke on Method with @PreDestroy annotation"); } } protected void invokeMethod(final Method m, final Object[] params) throws LifecycleException { try { AccessController.doPrivileged(new PrivilegedExceptionAction() { public Object run() throws InvocationTargetException, IllegalAccessException { return m.invoke(instance, params); } }); } catch (PrivilegedActionException e) { throw new LifecycleException(e.getException()); } } protected Method getPostConstructMethod() { // REVIEW: This method should not be called in performant situations. // Plus the super class methods are not being considered //return Method with @PostConstruct Annotation. if (instance != null) { final Class endpointClazz = instance.getClass(); Method[] methods = (Method[]) AccessController.doPrivileged(new PrivilegedAction() { public Object run() { return endpointClazz.getMethods(); } }); for (Method method : methods) { if (isPostConstruct(method)) { return method; } } } return null; } protected Method getPreDestroyMethod() { // REVIEW: This method should not be called in performant situations. // Plus the super class methods are not being considered //return Method with @PreDestroy Annotation if (instance != null) { final Class endpointClazz = instance.getClass(); Method[] methods = (Method[]) AccessController.doPrivileged(new PrivilegedAction() { public Object run() { return endpointClazz.getMethods(); } }); for (Method method : methods) { if (isPreDestroy(method)) { return method; } } } return null; } protected boolean isPostConstruct(final Method method) { Annotation[] annotations = (Annotation[]) AccessController.doPrivileged(new PrivilegedAction() { public Object run() { return method.getDeclaredAnnotations(); } }); for (Annotation annotation : annotations) { return PostConstruct.class.isAssignableFrom(annotation.annotationType()); } return false; } protected boolean isPreDestroy(final Method method) { Annotation[] annotations = (Annotation[]) AccessController.doPrivileged(new PrivilegedAction() { public Object run() { return method.getDeclaredAnnotations(); } }); for (Annotation annotation : annotations) { return PreDestroy.class.isAssignableFrom(annotation.annotationType()); } return false; } }