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.util.ArrayList;
024    import java.util.List;
025    
026    import javax.inject.Inject;
027    import javax.interceptor.AroundInvoke;
028    import javax.interceptor.Interceptor;
029    import javax.interceptor.InvocationContext;
030    
031    import org.granite.tide.invocation.ContextUpdate;
032    
033    
034    @TideComponent @Interceptor
035    public class TideComponentInterceptor {
036            
037            @Inject
038            private CDIServiceContext tideContext;
039            
040    
041            @AroundInvoke
042            public Object doAround(InvocationContext invocation) throws Exception {
043                    
044            TideInvocation tideInvocation = TideInvocation.get();
045            
046            if (tideContext == null || tideInvocation == null || tideInvocation.isLocked())
047                return invocation.proceed();
048            
049            boolean evaluate = false;
050            
051            if (tideInvocation.isEnabled() && !tideInvocation.isUpdated()) {
052                List<ContextUpdate> updates = new ArrayList<ContextUpdate>(tideInvocation.getUpdates());
053                tideInvocation.updated();
054                tideContext.restoreContext(updates, invocation.getTarget());
055                evaluate = true;
056            }
057                    
058                    Object result = invocation.proceed();
059    
060            if (evaluate)
061                tideInvocation.evaluated(tideContext.evaluateResults(invocation.getTarget(), false));
062    
063                    return result;
064            }
065    }