alvinalexander.com | career | drupal | java | mac | mysql | perl | scala | uml | unix  

Glassfish example source code file (InitHandler.java)

This example Glassfish source code file (InitHandler.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

abstractattributehandler, annotation, annotation, class, ejb, ejbinitinfo, ejbsessiondescriptor, init, init, inithandler, log, method, method, methoddescriptor, methoddescriptor, reflection, servlet, string, string, web

The Glassfish InitHandler.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 org.glassfish.ejb.deployment.annotation.handlers;

import java.lang.annotation.Annotation;
import java.lang.annotation.ElementType;
import java.lang.reflect.AnnotatedElement;
import java.lang.reflect.Method;
import java.lang.NoSuchMethodException;
import java.util.logging.Level;

import javax.ejb.Init;

import com.sun.enterprise.deployment.EjbDescriptor;
import com.sun.enterprise.deployment.EjbInitInfo;
import com.sun.enterprise.deployment.EjbSessionDescriptor;
import com.sun.enterprise.deployment.MethodDescriptor;
import com.sun.enterprise.deployment.util.TypeUtil;

import org.glassfish.apf.AnnotationInfo;
import org.glassfish.apf.AnnotationProcessorException;
import org.glassfish.apf.HandlerProcessingResult;
import com.sun.enterprise.deployment.annotation.context.EjbContext;
import org.glassfish.ejb.deployment.annotation.handlers.AbstractAttributeHandler;
import org.jvnet.hk2.annotations.Service;

/**
 * This handler is responsible for handling the javax.ejb.Init attribute
 *
 */
@Service
public class InitHandler extends AbstractAttributeHandler {
    
    public InitHandler() {
    }
    
    /**
     * @return the annoation type this annotation handler is handling
     */
    public Class<? extends Annotation> getAnnotationType() {
        return Init.class;
    }    
        
    protected HandlerProcessingResult processAnnotation(AnnotationInfo ainfo,
            EjbContext[] ejbContexts) throws AnnotationProcessorException {

        Init init = (Init) ainfo.getAnnotation();

        for(EjbContext next : ejbContexts) {
            
            EjbSessionDescriptor sessionDescriptor = 
                (EjbSessionDescriptor) next.getDescriptor();

            Method m = (Method) ainfo.getAnnotatedElement();

            // Check for matching method on home and/or local home interface.

            int numMatches = 0;

            
            String adaptedCreateMethodName = init.value();

            try {
                if( sessionDescriptor.isRemoteInterfacesSupported() ) {
                    addInitMethod(sessionDescriptor, m, 
                                  adaptedCreateMethodName, false);
                    numMatches++;
                }
            } catch(Exception e) {
            }                   

            try {                
                if( sessionDescriptor.isLocalInterfacesSupported() ) {
                    addInitMethod(sessionDescriptor, m, 
                                  adaptedCreateMethodName, true);
                    numMatches++;
                }
            } catch(Exception e) {                
            }

            if( numMatches == 0 ) {
                log(Level.SEVERE, ainfo, 
                    localStrings.getLocalString(
                    "enterprise.deployment.annotation.handlers.notmatchcreate",
                    "Unable to find matching Home create method for Init method {0} on bean {1}.",
                    new Object[] { m, sessionDescriptor.getName() }));
                return getDefaultFailedResult();
            }
        }

        return getDefaultProcessedResult();
    }

    private void addInitMethod(EjbSessionDescriptor descriptor,
                               Method beanMethod, 
                               String adaptedCreateMethodName, boolean local) 
        throws Exception {

        String homeIntfName = local ? descriptor.getLocalHomeClassName() :
            descriptor.getHomeClassName();            

        ClassLoader cl = descriptor.getEjbBundleDescriptor().getClassLoader();

        Class homeIntf = cl.loadClass(homeIntfName);
        
        Method createMethod = null;
        if( (adaptedCreateMethodName == null) || 
            (adaptedCreateMethodName.equals("")) ) {
            // Can't make any assumptions about matching method name.  Could
            // be "create" or some form of create<METHOD>, so match based on
            // signature.
            for(Method next : homeIntf.getMethods()) {
                if( next.getName().startsWith("create") &&
                    TypeUtil.sameParamTypes(next, beanMethod) ) {
                    createMethod = next;
                    break;
                }
            }
            if( createMethod == null ) {
                throw new NoSuchMethodException("No matching adapted home " +
                                                "method found for @Init " +
                                                " method " + beanMethod);
            }
        } else {
            createMethod = homeIntf.getMethod(adaptedCreateMethodName, 
                                              beanMethod.getParameterTypes());
        }
        
        MethodDescriptor beanMethodDescriptor =
            new MethodDescriptor(beanMethod, MethodDescriptor.EJB_BEAN);
        
        MethodDescriptor createMethodDescriptor = 
            new MethodDescriptor(createMethod, 
                                 ( local ?
                                   MethodDescriptor.EJB_HOME :
                                   MethodDescriptor.EJB_LOCALHOME ));
        
        EjbInitInfo initInfo = new EjbInitInfo();
                    
        initInfo.setBeanMethod(beanMethodDescriptor);
        initInfo.setCreateMethod(createMethodDescriptor);

        descriptor.addInitMethod(initInfo);
        
    }

    /**
     * @return an array of annotation types this annotation handler would 
     * require to be processed (if present) before it processes it's own 
     * annotation type.
     */
    public Class<? extends Annotation>[] getTypeDependencies() {
        return getEjbAnnotationTypes();
    }
}

Other Glassfish examples (source code examples)

Here is a short list of links related to this Glassfish InitHandler.java source code file:

... this post is sponsored by my books ...

#1 New Release!

FP Best Seller

 

new blog posts

 

Copyright 1998-2021 Alvin Alexander, alvinalexander.com
All Rights Reserved.

A percentage of advertising revenue from
pages under the /java/jwarehouse URI on this website is
paid back to open source projects.