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 */
022 package org.granite.tide.cdi;
023
024 import javax.enterprise.event.Event;
025 import javax.enterprise.inject.Instance;
026 import javax.inject.Inject;
027 import javax.interceptor.AroundInvoke;
028 import javax.interceptor.Interceptor;
029 import javax.interceptor.InvocationContext;
030
031 import org.granite.gravity.Gravity;
032 import org.granite.tide.data.DataContext;
033 import org.granite.tide.data.DataEnabled;
034 import org.granite.tide.data.DataEnabled.PublishMode;
035 import org.granite.tide.data.DataTopicParams;
036 import 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
047 public 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 }