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
021package org.granite.tide.seam;
022
023import org.granite.gravity.Gravity;
024import org.granite.tide.data.DataContext;
025import org.granite.tide.data.DataEnabled;
026import org.granite.tide.data.DataUpdatePostprocessor;
027import org.granite.tide.data.DataEnabled.PublishMode;
028import org.jboss.seam.Component;
029import org.jboss.seam.annotations.intercept.AroundInvoke;
030import org.jboss.seam.annotations.intercept.Interceptor;
031import org.jboss.seam.core.Events;
032import org.jboss.seam.intercept.AbstractInterceptor;
033import org.jboss.seam.intercept.InvocationContext;
034import 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})
044public 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}