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 org.granite.gravity.Gravity;
024    import org.granite.tide.data.DataContext;
025    import org.granite.tide.data.DataEnabled;
026    import org.granite.tide.data.DataUpdatePostprocessor;
027    import org.granite.tide.data.DataEnabled.PublishMode;
028    import org.jboss.seam.Component;
029    import org.jboss.seam.annotations.intercept.AroundInvoke;
030    import org.jboss.seam.annotations.intercept.Interceptor;
031    import org.jboss.seam.core.Events;
032    import org.jboss.seam.intercept.AbstractInterceptor;
033    import org.jboss.seam.intercept.InvocationContext;
034    import org.jboss.seam.transaction.TransactionInterceptor;
035    
036    
037    /**
038     * Seam interceptor to handle publishing of data changes instead of relying on the default behaviour
039     * This can be used outside of a HTTP Granite context and inside the security/transaction context
040     * @author William DRAI
041     *
042     */
043    @Interceptor(stateless=true, within={TransactionInterceptor.class})
044    public class TideDataPublishingInterceptor extends AbstractInterceptor {
045            
046            private static final long serialVersionUID = 1L;
047    
048        @AroundInvoke
049        public Object aroundInvoke(InvocationContext invocationContext) throws Exception {
050            DataEnabled dataEnabled = getComponent().getBeanClass().getAnnotation(DataEnabled.class);
051            
052            if (dataEnabled == null || !dataEnabled.useInterceptor())
053                            return invocationContext.proceed();
054            
055                    if (SeamUtils.isLifecycleMethod(getComponent(), invocationContext.getMethod()))
056                            return invocationContext.proceed();
057            
058            boolean shouldRemoveContextAtEnd = DataContext.get() == null;
059            boolean shouldInitContext = shouldRemoveContextAtEnd || DataContext.isNull();
060            boolean onCommit = false;
061            
062            if (shouldInitContext) {
063                    Gravity gravity = (Gravity)Component.getInstance("org.granite.seam.gravity");
064                    DataContext.init(gravity, dataEnabled.topic(), dataEnabled.params(), dataEnabled.publish());
065                    
066                    DataUpdatePostprocessor dataUpdatePostprocessor = (DataUpdatePostprocessor)Component.getInstance("org.granite.tide.seam.data.dataUpdatePreprocessor", true);
067                    if (dataUpdatePostprocessor != null)
068                            DataContext.get().setDataUpdatePostprocessor(dataUpdatePostprocessor);
069            }
070            
071            DataContext.observe();
072            try {
073                    if (dataEnabled.publish().equals(PublishMode.ON_COMMIT)) {
074                            Events.instance().raiseTransactionSuccessEvent("org.granite.tide.seam.data.transactionSuccess", shouldRemoveContextAtEnd);
075                            Events.instance().raiseTransactionCompletionEvent("org.granite.tide.seam.data.transactionCompletion", shouldRemoveContextAtEnd);
076                            onCommit = true;
077                    }
078                    
079                    Object ret = invocationContext.proceed();
080                    
081                    DataContext.publish(PublishMode.ON_SUCCESS);
082                    return ret;
083            }
084            finally {
085                    if (shouldRemoveContextAtEnd && !onCommit)
086                            DataContext.remove();
087            }
088        }
089        
090            // Needed for Seam 2.1
091        public boolean isInterceptorEnabled() {
092            return getComponent().beanClassHasAnnotation(DataEnabled.class) && getComponent().getBeanClass().getAnnotation(DataEnabled.class).useInterceptor();
093        }
094    }