/*
* JBoss, Home of Professional Open Source
* Copyright 2005, JBoss Inc., and individual contributors as indicated
* by the @authors tag. See the copyright.txt in the distribution for a
* full listing of individual contributors.
*
* This is free software; you can redistribute it and/or modify it
* under the terms of the GNU Lesser General Public License as
* published by the Free Software Foundation; either version 2.1 of
* the License, or (at your option) any later version.
*
* This software is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
* Lesser General Public License for more details.
*
* You should have received a copy of the GNU Lesser General Public
* License along with this software; if not, write to the Free
* Software Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA
* 02110-1301 USA, or see the FSF site: http://www.fsf.org.
*/
package org.jboss.cache.pojo.impl;
import static org.jboss.cache.pojo.impl.InternalConstant.POJOCACHE_OPERATION;
import static org.jboss.cache.pojo.impl.InternalConstant.POJOCACHE_STATUS;
import static org.jboss.cache.notifications.event.Event.Type.TRANSACTION_COMPLETED;
import static org.jboss.cache.notifications.event.Event.Type.TRANSACTION_REGISTERED;
import java.lang.reflect.Field;
import java.util.Collection;
import java.util.HashSet;
import java.util.List;
import java.util.Map;
import java.util.Set;
import java.util.regex.Pattern;
import javax.transaction.Transaction;
import org.apache.commons.logging.Log;
import org.apache.commons.logging.LogFactory;
import org.jboss.cache.Fqn;
import org.jboss.cache.notifications.annotation.CacheListener;
import org.jboss.cache.notifications.annotation.NodeModified;
import org.jboss.cache.notifications.annotation.TransactionCompleted;
import org.jboss.cache.notifications.annotation.TransactionRegistered;
import org.jboss.cache.notifications.event.NodeModifiedEvent;
import org.jboss.cache.notifications.event.TransactionalEvent;
import org.jboss.cache.notifications.event.NodeModifiedEvent.ModificationType;
import org.jboss.cache.pojo.PojoCache;
import org.jboss.cache.pojo.interceptors.PojoTxLockInterceptor;
import org.jboss.cache.pojo.notification.NotificationContext;
import org.jboss.cache.pojo.notification.event.AttachedEvent;
import org.jboss.cache.pojo.notification.event.DetachedEvent;
import org.jboss.cache.pojo.notification.event.Event;
import org.jboss.cache.pojo.notification.event.FieldModifiedEvent;
import org.jboss.cache.pojo.notification.event.ListModifiedEvent;
import org.jboss.cache.pojo.notification.event.MapModifiedEvent;
import org.jboss.cache.pojo.notification.event.SetModifiedEvent;
import org.jboss.cache.pojo.notification.event.TransactionCompletedEvent;
import org.jboss.cache.pojo.notification.event.TransactionRegisteredEvent;
// $Id: CacheListenerAdaptor.java 4100 2007-07-03 01:32:25Z jgreene $
/**
* Adapts the core cache listener API into the POJO listener API.
*
* @author Jason T. Greene
*/
@CacheListener
public class CacheListenerAdaptor
{
private static final HashSet<String> internalKeys = new HashSet<String>();
private static final Log log = LogFactory.getLog(CacheListenerAdaptor.class);
static
{
internalKeys.add(POJOCACHE_STATUS);
internalKeys.add(POJOCACHE_OPERATION);
internalKeys.add(PojoInstance.KEY);
internalKeys.add(PojoReference.KEY);
internalKeys.add(PojoTxLockInterceptor.LOCK_KEY);
}
private PojoCacheImpl cache;
private NotificationDispatcher dispatcher = new NotificationDispatcher();
public CacheListenerAdaptor(PojoCacheImpl cache)
{
this.cache = cache;
}
public PojoCache getPojoCache()
{
return this.cache;
}
private FieldModifiedEvent createModifyEvent(NotificationContext context, Fqn fqn, String key, Object value, boolean local)
{
if (value instanceof PojoReference)
value = cache.find(((PojoReference) value).getFqn().toString());
Object o = cache.find(fqn.toString());
// Detached
if (o == null)
return null;
Field f;
try
{
f = o.getClass().getDeclaredField(key);
}
catch (NoSuchFieldException e)
{
if (log.isWarnEnabled())
log.warn("Could not get field " + key + " on class " + o.getClass());
return null;
}
return new FieldModifiedEvent(context, o, f, value, local);
}
private NotificationContext createContext(final TransactionalEvent event)
{
return new NotificationContext()
{
public PojoCache getPojoCache()
{
return CacheListenerAdaptor.this.getPojoCache();
}
public Transaction getTransaction()
{
return event.getTransaction();
}
};
}
private void sendNotification(Event notification, Set<NotificationDispatcher.Entry> listeners)
{
if (notification == null)
return;
if (listeners == null)
dispatcher.dispatch(notification);
else
dispatcher.dispatch(notification, listeners);
}
@TransactionCompleted
@TransactionRegistered
public void handleTransaction(TransactionalEvent event)
{
if (event.getType() == TRANSACTION_COMPLETED)
{
boolean successful = ((org.jboss.cache.notifications.event.TransactionCompletedEvent) event).isSuccessful();
sendNotification(new TransactionCompletedEvent(createContext(event), successful, event.isOriginLocal()), null);
}
else if (event.getType() == TRANSACTION_REGISTERED)
{
sendNotification(new TransactionRegisteredEvent(createContext(event), event.isOriginLocal()), null);
}
}
@NodeModified
public void nodeModified(NodeModifiedEvent event)
{
Map<Object, Object> data = event.getData();
boolean pre = event.isPre();
Fqn fqn = event.getFqn();
ModificationType modType = event.getModificationType();
boolean isLocal = event.isOriginLocal();
if (pre)
return;
//System.out.println(fqn + " " + modType + " " + data);
// If we are filtering, don't load as much as possible
Set<NotificationDispatcher.Entry> matched = null;
if (dispatcher.hasFilters())
{
matched = matchListeners(fqn);
if (matched != null && matched.isEmpty())
return;
}
if (modType == ModificationType.PUT_DATA)
{
if ("ATTACHED".equals(data.get(POJOCACHE_STATUS)))
{
Object o = cache.find(fqn.toString());
sendNotification(new AttachedEvent(createContext(event), o, isLocal), matched);
}
else if ("DETACHING".equals(data.get(POJOCACHE_STATUS)))
{
Object o = cache.find(fqn.toString());
sendNotification(new DetachedEvent(createContext(event), o, isLocal), matched);
}
else if (data.containsKey(POJOCACHE_OPERATION))
{
Object collection = cache.find(fqn.getParent().toString());
if (collection instanceof List)
{
int i = Integer.parseInt(fqn.getLastElementAsString());
ListModifiedEvent.Operation operation = ListModifiedEvent.Operation.valueOf(data.get(POJOCACHE_OPERATION).toString());
Object value = cache.find(fqn.toString());
sendNotification(new ListModifiedEvent(createContext(event), (List) collection, operation, i, value, isLocal), matched);
}
else if (collection instanceof Set)
{
SetModifiedEvent.Operation operation = SetModifiedEvent.Operation.valueOf(data.get(POJOCACHE_OPERATION).toString());
Object value = cache.find(fqn.toString());
sendNotification(new SetModifiedEvent(createContext(event), (Set) collection, operation, value, isLocal), matched);
}
else if (collection instanceof Map)
{
MapModifiedEvent.Operation operation = MapModifiedEvent.Operation.valueOf(data.get(POJOCACHE_OPERATION).toString());
Object value = cache.find(fqn.toString());
sendNotification(new MapModifiedEvent(createContext(event), (Map) collection, operation, fqn.getLastElement(), value, isLocal), matched);
}
}
else if ("ATTACHED".equals(cache.getCache().get(fqn, POJOCACHE_STATUS)))
{
for (Map.Entry entry : data.entrySet())
{
String key = entry.getKey().toString();
Object value = entry.getValue();
if (internalKeys.contains(key))
continue;
sendNotification(createModifyEvent(createContext(event), fqn, key, value, isLocal), matched);
}
}
}
else if (modType == ModificationType.REMOVE_DATA)
{
for (Map.Entry entry : data.entrySet())
{
String key = entry.getKey().toString();
if (internalKeys.contains(key))
continue;
sendNotification(createModifyEvent(createContext(event), fqn, key, null, isLocal), matched);
}
}
}
private Set<NotificationDispatcher.Entry> matchListeners(Fqn fqn)
{
PojoInstance instance = (PojoInstance) cache.getCache().get(fqn, PojoInstance.KEY);
if (instance != null)
return dispatcher.getListenerEntries(instance.getReferences());
return null;
}
public boolean isEmpty()
{
return dispatcher.isEmpty();
}
public Collection<Object> getListeners()
{
return dispatcher.getListeners();
}
public void addListener(Object listener)
{
dispatcher.add(listener);
}
public void addListener(Object listener, Pattern pattern)
{
if (pattern == null)
dispatcher.add(listener);
else
dispatcher.add(listener, pattern);
}
public void removeListener(Object listener)
{
dispatcher.remove(listener);
}
}