001    /*
002      GRANITE DATA SERVICES
003      Copyright (C) 2012 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.client.tide.data;
022    
023    import org.granite.client.messaging.messages.responses.FaultMessage;
024    import org.granite.client.messaging.messages.responses.FaultMessage.Code;
025    import org.granite.client.tide.Context;
026    import org.granite.client.tide.server.ExceptionHandler;
027    import org.granite.client.tide.server.TideFaultEvent;
028    import org.granite.logging.Logger;
029    
030    /**
031       * @author William DRAI
032       */
033    public class OptimisticLockExceptionHandler implements ExceptionHandler {
034          
035            private static Logger log = Logger.getLogger("org.granite.tide.data.OptimisticLockExceptionHandler");
036      
037    
038            @Override
039            public boolean accepts(FaultMessage emsg) {
040                    return emsg.getCode().equals(Code.OPTIMISTIC_LOCK);
041            }
042    
043            @Override
044            public void handle(Context context, FaultMessage emsg, TideFaultEvent faultEvent) {
045                    log.debug("optimistic lock error received %s", emsg.toString());
046                    
047                    String receivedSessionId = faultEvent.getServerSession().getSessionId() + "_error";
048                    Object entity = (emsg.getExtended() != null && emsg.getExtended().get("entity") != null) ? emsg.getExtended().get("entity") : null;
049      
050                    // Received entity should be the correct version from the database
051            if (entity != null)
052                    context.getEntityManager().mergeExternalData(faultEvent.getServerSession(), entity, null, receivedSessionId, null, null);
053          }
054      }