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.cdi;
023
024import javax.enterprise.event.Event;
025import javax.enterprise.inject.Instance;
026import javax.inject.Inject;
027import javax.interceptor.AroundInvoke;
028import javax.interceptor.Interceptor;
029import javax.interceptor.InvocationContext;
030
031import org.granite.gravity.Gravity;
032import org.granite.tide.data.DataContext;
033import org.granite.tide.data.DataEnabled;
034import org.granite.tide.data.DataEnabled.PublishMode;
035import org.granite.tide.data.DataTopicParams;
036import org.granite.tide.data.DataUpdatePostprocessor;
037
038
039/**
040 * CDI interceptor to handle publishing of data changes instead of relying on the default behaviour
041 * This can be used outside of a HTTP Granite context and should be applied inside the security/transaction context
042 * 
043 * @author William DRAI
044 */
045@DataEnabled(topic="", params=DataTopicParams.class, publish=PublishMode.MANUAL, useInterceptor=true)
046@Interceptor
047public class TideDataPublishingInterceptor {
048        
049        @Inject
050        private Gravity gravity;
051        
052        @Inject
053        private Instance<DataUpdatePostprocessor> dataUpdatePostprocessor;
054        
055        @Inject
056        private Event<TideDataPublishingEvent> dataPublishingEvent;
057        
058    @AroundInvoke
059    public Object processPublishData(InvocationContext invocationContext) throws Throwable {
060        DataEnabled dataEnabled = invocationContext.getMethod().getDeclaringClass().getAnnotation(DataEnabled.class);
061        if (dataEnabled == null || !dataEnabled.useInterceptor())
062                return invocationContext.proceed();
063        
064        boolean shouldRemoveContextAtEnd = DataContext.get() == null;
065        boolean shouldInitContext = shouldRemoveContextAtEnd || DataContext.isNull();
066        boolean onCommit = false;
067        
068        if (shouldInitContext) {
069                DataContext.init(gravity, dataEnabled.topic(), dataEnabled.params(), dataEnabled.publish());
070                
071                if (!dataUpdatePostprocessor.isUnsatisfied())
072                        DataContext.get().setDataUpdatePostprocessor(dataUpdatePostprocessor.get());
073        }
074        
075        DataContext.observe();
076        try {
077                if (dataEnabled.publish().equals(PublishMode.ON_COMMIT)) {
078                        dataPublishingEvent.fire(new TideDataPublishingEvent(shouldRemoveContextAtEnd));
079                        onCommit = true;
080                }
081                
082                Object ret = invocationContext.proceed();
083                
084                DataContext.publish(PublishMode.ON_SUCCESS);
085                return ret;
086        }
087        finally {
088                if (shouldRemoveContextAtEnd && !onCommit)
089                        DataContext.remove();
090        }
091    }
092}