001/**
002 *   GRANITE DATA SERVICES
003 *   Copyright (C) 2006-2013 GRANITE DATA SERVICES S.A.S.
004 *
005 *   This file is part of the Granite Data Services Platform.
006 *
007 *   Granite Data Services is free software; you can redistribute it and/or
008 *   modify it under the terms of the GNU Lesser General Public
009 *   License as published by the Free Software Foundation; either
010 *   version 2.1 of the License, or (at your option) any later version.
011 *
012 *   Granite Data Services is distributed in the hope that it will be useful,
013 *   but WITHOUT ANY WARRANTY; without even the implied warranty of
014 *   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU Lesser
015 *   General Public License for more details.
016 *
017 *   You should have received a copy of the GNU Lesser General Public
018 *   License along with this library; if not, write to the Free Software
019 *   Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301,
020 *   USA, or see <http://www.gnu.org/licenses/>.
021 */
022package org.granite.tide.seam;
023
024import org.granite.gravity.Gravity;
025import org.granite.tide.data.DataContext;
026import org.granite.tide.data.DataEnabled;
027import org.granite.tide.data.DataUpdatePostprocessor;
028import org.granite.tide.data.DataEnabled.PublishMode;
029import org.jboss.seam.Component;
030import org.jboss.seam.annotations.intercept.AroundInvoke;
031import org.jboss.seam.annotations.intercept.Interceptor;
032import org.jboss.seam.core.Events;
033import org.jboss.seam.intercept.AbstractInterceptor;
034import org.jboss.seam.intercept.InvocationContext;
035import org.jboss.seam.transaction.TransactionInterceptor;
036
037
038/**
039 * Seam interceptor to handle publishing of data changes instead of relying on the default behaviour
040 * This can be used outside of a HTTP Granite context and inside the security/transaction context
041 * @author William DRAI
042 *
043 */
044@Interceptor(stateless=true, within={TransactionInterceptor.class})
045public class TideDataPublishingInterceptor extends AbstractInterceptor {
046        
047        private static final long serialVersionUID = 1L;
048
049    @AroundInvoke
050    public Object aroundInvoke(InvocationContext invocationContext) throws Exception {
051        DataEnabled dataEnabled = getComponent().getBeanClass().getAnnotation(DataEnabled.class);
052        
053        if (dataEnabled == null || !dataEnabled.useInterceptor())
054                        return invocationContext.proceed();
055        
056                if (SeamUtils.isLifecycleMethod(getComponent(), invocationContext.getMethod()))
057                        return invocationContext.proceed();
058        
059        boolean shouldRemoveContextAtEnd = DataContext.get() == null;
060        boolean shouldInitContext = shouldRemoveContextAtEnd || DataContext.isNull();
061        boolean onCommit = false;
062        
063        if (shouldInitContext) {
064                Gravity gravity = (Gravity)Component.getInstance("org.granite.seam.gravity");
065                DataContext.init(gravity, dataEnabled.topic(), dataEnabled.params(), dataEnabled.publish());
066                
067                DataUpdatePostprocessor dataUpdatePostprocessor = (DataUpdatePostprocessor)Component.getInstance("org.granite.tide.seam.data.dataUpdatePreprocessor", true);
068                if (dataUpdatePostprocessor != null)
069                        DataContext.get().setDataUpdatePostprocessor(dataUpdatePostprocessor);
070        }
071        
072        DataContext.observe();
073        try {
074                if (dataEnabled.publish().equals(PublishMode.ON_COMMIT)) {
075                        Events.instance().raiseTransactionSuccessEvent("org.granite.tide.seam.data.transactionSuccess", shouldRemoveContextAtEnd);
076                        Events.instance().raiseTransactionCompletionEvent("org.granite.tide.seam.data.transactionCompletion", shouldRemoveContextAtEnd);
077                        onCommit = true;
078                }
079                
080                Object ret = invocationContext.proceed();
081                
082                DataContext.publish(PublishMode.ON_SUCCESS);
083                return ret;
084        }
085        finally {
086                if (shouldRemoveContextAtEnd && !onCommit)
087                        DataContext.remove();
088        }
089    }
090    
091        // Needed for Seam 2.1
092    public boolean isInterceptorEnabled() {
093        return getComponent().beanClassHasAnnotation(DataEnabled.class) && getComponent().getBeanClass().getAnnotation(DataEnabled.class).useInterceptor();
094    }
095}