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    
021    package org.granite.tide.cdi;
022    
023    import java.io.Serializable;
024    
025    import javax.enterprise.context.ContextNotActiveException;
026    import javax.enterprise.event.Observes;
027    import javax.enterprise.event.Reception;
028    import javax.enterprise.inject.Any;
029    import javax.enterprise.inject.spi.Bean;
030    import javax.enterprise.inject.spi.BeanManager;
031    import javax.inject.Inject;
032    
033    
034    /**
035     * TideEvents override to intercept CDI events handling
036     * 
037     * @author William DRAI
038     */
039    public class TideEvents implements Serializable {
040        
041            private static final long serialVersionUID = 1L;
042    
043            @Inject
044        private BeanManager manager;
045        
046        private boolean reentrant = false;
047        
048        
049        public void processEvent(@Observes(notifyObserver=Reception.ALWAYS) @Any Object event) {
050            if (reentrant || TideInvocation.get() == null) {
051                    // Ignore events outside of the current bean invocation
052                    return;
053            }
054            
055            try {
056                    reentrant = true;
057                    // Cannot inject service context as this observer is called very early before the full app initialization
058                    @SuppressWarnings("unchecked")
059                    Bean<CDIServiceContext> scBean = (Bean<CDIServiceContext>)manager.getBeans(CDIServiceContext.class).iterator().next();
060                    CDIServiceContext serviceContext = (CDIServiceContext)manager.getReference(scBean, CDIServiceContext.class, manager.createCreationalContext(scBean));
061                    if (serviceContext != null)
062                            serviceContext.processEvent(event);
063            }
064            catch (ContextNotActiveException e) {
065                    // Ignore event, no session context
066            }
067            finally {
068                    reentrant = false;
069            }
070        }
071    }