001/*
002  GRANITE DATA SERVICES
003  Copyright (C) 2011 GRANITE DATA SERVICES S.A.S.
004
005  This file is part of Granite Data Services.
006
007  Granite Data Services is free software; you can redistribute it and/or modify
008  it under the terms of the GNU Library General Public License as published by
009  the Free Software Foundation; either version 2 of the License, or (at your
010  option) any later version.
011
012  Granite Data Services is distributed in the hope that it will be useful, but
013  WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
014  FITNESS FOR A PARTICULAR PURPOSE. See the GNU Library General Public License
015  for more details.
016
017  You should have received a copy of the GNU Library General Public License
018  along with this library; if not, see <http://www.gnu.org/licenses/>.
019*/
020
021package org.granite.messaging.service;
022
023import javax.ejb.NoSuchEJBException;
024import javax.naming.NamingException;
025
026import org.granite.config.flex.Destination;
027import org.granite.logging.Logger;
028
029/**
030 * @author Franck WOLFF
031 */
032public class EjbServiceInvoker extends ServiceInvoker<EjbServiceFactory> {
033
034    private static final Logger log = Logger.getLogger(EjbServiceInvoker.class);
035
036    public static final String CAPITALIZED_DESTINATION_ID = "{capitalized.destination.id}";
037    public static final String DESTINATION_ID = "{destination.id}";
038    
039    private final EjbServiceMetadata metadata;
040    
041    public EjbServiceInvoker(Destination destination, EjbServiceFactory factory) throws ServiceException {
042        super(destination, factory);
043
044        String lookup = factory.getLookup();
045        if (destination.getProperties().containsKey("lookup"))
046            lookup = destination.getProperties().get("lookup");
047
048        // Compute EJB JNDI binding.
049        String name = destination.getId();
050        if (lookup != null) {
051            name = lookup;
052            if (lookup.contains(CAPITALIZED_DESTINATION_ID))
053                name = lookup.replace(CAPITALIZED_DESTINATION_ID, capitalize(destination.getId()));
054            if (lookup.contains(DESTINATION_ID))
055                name = lookup.replace(DESTINATION_ID, destination.getId());
056        }
057
058        log.debug(">> New EjbServiceInvoker looking up: %s", name);
059
060        try {
061            invokee = factory.lookup(name);
062        } catch (NamingException e) {
063            throw new ServiceException("Could not lookup for: " + name, e);
064        }
065        
066        this.metadata = destination.getScannedClass() != null ?
067                new EjbServiceMetadata(destination.getScannedClass(), invokee.getClass()) :
068                new EjbServiceMetadata(destination.getProperties(), invokee.getClass());
069    }
070
071        public EjbServiceMetadata getMetadata() {
072                return metadata;
073        }
074
075        @Override
076        protected void afterInvocationError(ServiceInvocationContext context, Throwable error) {
077        // "A NoSuchEJBException is thrown if an attempt is made to invoke a method
078        // on an object that no longer exists" (javadoc on NoSuchEJBException).
079        if (error instanceof NoSuchEJBException || (
080                        metadata.isStateful() &&
081                        metadata.isRemoveMethod(context.getMethod()) &&
082                        !metadata.getRetainIfException(context.getMethod())
083                ))
084                factory.removeFromCache(destination.getId());
085        }
086
087        @Override
088        protected Object afterInvocation(ServiceInvocationContext context, Object result) {
089                if (metadata.isStateful() && metadata.isRemoveMethod(context.getMethod()))
090                        factory.removeFromCache(destination.getId());
091                return result;
092        }
093        
094        private String capitalize(String s) {
095        if (s == null || s.length() == 0)
096            return s;
097        if (s.length() == 1)
098            return s.toUpperCase();
099        return s.substring(0, 1).toUpperCase() + s.substring(1);
100    }
101}