Glassfish example source code file (InterceptorInvocationHandler.java)

This example Glassfish source code file (InterceptorInvocationHandler.java) is included in the DevDaily.com "Java Source Code Warehouse" project. The intent of this project is to help you "Learn Java by Example" ^TM.

Java - Glassfish tags/keywords

aroundinvokeinvocationcontext, aroundinvokeinvocationcontext, ejb, exception, exception, interceptorinvoker, interceptormanager, interceptormanager, invocationhandlerutil, method, object, object, override, reflection, rmi, runtimeexception, servlet, string, util, web

The Glassfish InterceptorInvocationHandler.java source code

/*
 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS HEADER.
 *
 * Copyright (c) 1997-2010 Oracle and/or its affiliates. All rights reserved.
 *
 * The contents of this file are subject to the terms of either the GNU
 * General Public License Version 2 only ("GPL") or the Common Development
 * and Distribution License("CDDL") (collectively, the "License").  You
 * may not use this file except in compliance with the License.  You can
 * obtain a copy of the License at
 * https://glassfish.dev.java.net/public/CDDL+GPL_1_1.html
 * or packager/legal/LICENSE.txt.  See the License for the specific
 * language governing permissions and limitations under the License.
 *
 * When distributing the software, include this License Header Notice in each
 * file and include the License file at packager/legal/LICENSE.txt.
 *
 * GPL Classpath Exception:
 * Oracle designates this particular file as subject to the "Classpath"
 * exception as provided by Oracle in the GPL Version 2 section of the License
 * file that accompanied this code.
 *
 * Modifications:
 * If applicable, add the following below the License Header, with the fields
 * enclosed by brackets [] replaced by your own identifying information:
 * "Portions Copyright [year] [name of copyright owner]"
 *
 * Contributor(s):
 * If you wish your version of this file to be governed by only the CDDL or
 * only the GPL Version 2, indicate your decision by adding "[Contributor]
 * elects to include this software in this distribution under the [CDDL or GPL
 * Version 2] license."  If you don't indicate a single choice of license, a
 * recipient has the option to distribute your version of this file under
 * either the CDDL, the GPL Version 2 or to extend the choice of license to
 * its licensees as provided above.  However, if you add GPL Version 2 code
 * and therefore, elected the GPL Version 2 license, then the option applies
 * only if the new code is made subject to such option by the copyright
 * holder.
 */

package com.sun.ejb.containers.interceptors;

import java.rmi.UnmarshalException;
import javax.ejb.AccessLocalException;

import java.lang.reflect.InvocationHandler;
import java.lang.reflect.InvocationTargetException;
import java.lang.reflect.Proxy;
import java.lang.reflect.Method;

import com.sun.enterprise.deployment.LifecycleCallbackDescriptor.CallbackType;

import com.sun.ejb.containers.InvocationHandlerUtil;

import java.util.Map;

import com.sun.enterprise.container.common.spi.InterceptorInvoker;

/** 
 *
 * @author Kenneth Saks
 */    

public final class InterceptorInvocationHandler  
    implements InvocationHandler, InterceptorInvoker {

    // The actual instance of the application class
    private Object targetInstance;

    // The object held by the application
    private Object clientProxy;

    private Object[] interceptorInstances;
    private InterceptorManager interceptorManager;

    private static Object[] emptyArray = new Object[] {};


    public void init(Object targetInstance, Object[] interceptorInstances,
                     Object clientProxy, InterceptorManager manager)
                     {
        this.targetInstance = targetInstance;
        this.interceptorInstances = interceptorInstances;
        this.clientProxy = clientProxy;
        interceptorManager = manager;

    }

    public Object getProxy() {
        return clientProxy;
    }

    public Object getTargetInstance() {
        return targetInstance;
    }

    public Object[] getInterceptorInstances() {
        return interceptorInstances;
    }

    public void invokePostConstruct() throws Exception {

         invokeCallback(CallbackType.POST_CONSTRUCT);

    }

    public void invokePreDestroy() throws Exception {

         invokeCallback(CallbackType.PRE_DESTROY);
    }

    private void invokeCallback(CallbackType type) throws Exception {

        try {
            interceptorManager.intercept(type, targetInstance,
                    interceptorInstances);
        } catch(Exception e) {
            throw e;
        } catch(Throwable t) {
            throw new Exception(t);
        }

    }


    public Object invoke(Object proxy, Method method, Object[] args) 
        throws Throwable {


        Class methodClass = method.getDeclaringClass();
        if( methodClass == java.lang.Object.class )  {
            return InvocationHandlerUtil.
                invokeJavaObjectMethod(this, method, args);    
        }

        Object returnValue = null;
      
        try {


            Method beanClassMethod = targetInstance.getClass().getMethod
                (method.getName(), method.getParameterTypes());

            InterceptorManager.InterceptorChain chain =
                    interceptorManager.getAroundInvokeChain(null, beanClassMethod);

            Object[] theArgs = (args == null) ? emptyArray : args;

            // Create context for around invoke invocation.  Make sure method set on
            // InvocationContext is from bean class.
            AroundInvokeInvocationContext invContext =
                    new AroundInvokeInvocationContext(targetInstance, interceptorInstances, chain,
                            beanClassMethod, theArgs );

            returnValue = interceptorManager.intercept(chain, invContext);

        } catch(NoSuchMethodException nsme) {
            throw new RuntimeException(nsme);
        } catch(InvocationTargetException ite) {
            throw ite.getCause();
        }

        return returnValue;

    }

    @Override
    public String toString() {
        return (targetInstance != null)? targetInstance.toString() : super.toString();
    }

}