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.seam;
022    
023    import static org.jboss.seam.annotations.Install.FRAMEWORK;
024    
025    import java.io.Serializable;
026    
027    import org.granite.tide.seam.async.AsyncContext;
028    import org.jboss.seam.Component;
029    import org.jboss.seam.ScopeType;
030    import org.jboss.seam.annotations.AutoCreate;
031    import org.jboss.seam.annotations.Install;
032    import org.jboss.seam.annotations.Name;
033    import org.jboss.seam.annotations.Scope;
034    import org.jboss.seam.annotations.intercept.BypassInterceptors;
035    import org.jboss.seam.async.Schedule;
036    import org.jboss.seam.core.Events;
037    
038    
039    /**
040     * TideEvents override to intercept Seam events handling
041     * 
042     * @author William DRAI
043     */
044    @Name("org.jboss.seam.core.events")
045    @Install(precedence=FRAMEWORK)
046    @Scope(ScopeType.STATELESS)
047    @BypassInterceptors
048    @AutoCreate
049    public class TideEvents extends Events {
050        
051        
052        @Override
053        public void raiseEvent(String type, Object... parameters) {
054            if (ASYNC_EVENT.equals(type)) {
055                    TideInvocation.init();
056                AbstractSeamServiceContext serviceContext = (AbstractSeamServiceContext)Component.getInstance(AbstractSeamServiceContext.COMPONENT_NAME, true);
057                
058                WrappedEvent event = (WrappedEvent)parameters[0];
059                serviceContext.setAsyncContext(event.getAsyncContext());    // Reset context
060                
061                raiseEvent(event.getType(), event.getParams());
062                
063                // Send event through Gravity only 
064                serviceContext.sendEvent(null, null);
065            }
066            else {
067                super.raiseEvent(type, parameters);
068                
069                // Ignore built-in Seam events to avoid stack overflow in component initialization
070                if (!type.startsWith("org.jboss.seam.pre") && !type.startsWith("org.jboss.seam.post")) {
071                    // Event should be always handled if we want to allow to send them through Gravity
072                    AbstractSeamServiceContext serviceContext = (AbstractSeamServiceContext)Component.getInstance(AbstractSeamServiceContext.COMPONENT_NAME, false);
073                    if (serviceContext != null)     // ServiceContext is null during Seam initialization
074                        serviceContext.raiseEvent(type, parameters);
075                }
076            }
077        }
078        
079        
080        protected static final String ASYNC_EVENT = "org.granite.tide.seam.AsyncEvent";
081        
082        protected static class WrappedEvent implements Serializable {
083            
084            private static final long serialVersionUID = 1L;
085            
086            private AsyncContext asyncContext;
087            private String type;
088            private Object[] params;
089            
090            public WrappedEvent(AsyncContext asyncContext, String type, Object[] params) {
091                this.asyncContext = asyncContext;
092                this.type = type;
093                this.params = params;
094            }
095            
096            public AsyncContext getAsyncContext() {
097                return asyncContext;
098            }
099            
100            public String getType() {
101                return type;
102            }
103            
104            public Object[] getParams() {
105                return params;
106            }
107        }
108    
109        
110        @Override
111        public void raiseAsynchronousEvent(String type, Object... parameters) {
112            AbstractSeamServiceContext serviceContext = (AbstractSeamServiceContext)Component.getInstance(AbstractSeamServiceContext.COMPONENT_NAME, false);
113            String sessionId = serviceContext != null ? serviceContext.getSessionId() : null;
114            if (serviceContext != null && sessionId != null)
115                super.raiseAsynchronousEvent(ASYNC_EVENT, new WrappedEvent(serviceContext.getAsyncContext(), type, parameters));
116            else
117                super.raiseAsynchronousEvent(type, parameters);
118        }
119        
120        
121        // Seam 2.0
122        @SuppressWarnings("all")
123        public void raiseTimedEvent(String type, Object schedule, Object... parameters) {
124            AbstractSeamServiceContext serviceContext = (AbstractSeamServiceContext)Component.getInstance(AbstractSeamServiceContext.COMPONENT_NAME, false);
125            String sessionId = serviceContext != null ? serviceContext.getSessionId() : null;
126            if (serviceContext != null && sessionId != null)
127                super.raiseTimedEvent(ASYNC_EVENT, (Schedule)schedule, new WrappedEvent(serviceContext.getAsyncContext(), type, parameters));
128            else
129                super.raiseTimedEvent(type, (Schedule)schedule, parameters);
130        }
131    }