//$Id: SessionFactoryObjectFactory.java 11338 2007-03-22 22:43:13Z epbernard $
package org.hibernate.impl;
import java.util.Hashtable;
import java.util.Iterator;
import java.util.Properties;
import javax.naming.Context;
import javax.naming.InvalidNameException;
import javax.naming.Name;
import javax.naming.NamingException;
import javax.naming.Reference;
import javax.naming.event.EventContext;
import javax.naming.event.NamespaceChangeListener;
import javax.naming.event.NamingEvent;
import javax.naming.event.NamingExceptionEvent;
import javax.naming.event.NamingListener;
import javax.naming.spi.ObjectFactory;
import org.hibernate.SessionFactory;
import org.hibernate.util.FastHashMap;
import org.hibernate.util.NamingHelper;
import org.apache.commons.logging.Log;
import org.apache.commons.logging.LogFactory;
/**
* Resolves <tt>SessionFactory</tt> JNDI lookups and deserialization
*/
public class SessionFactoryObjectFactory implements ObjectFactory {
private static final SessionFactoryObjectFactory INSTANCE; //to stop the class from being unloaded
private static final Log log;
static {
log = LogFactory.getLog(SessionFactoryObjectFactory.class);
INSTANCE = new SessionFactoryObjectFactory();
log.debug("initializing class SessionFactoryObjectFactory");
}
private static final FastHashMap INSTANCES = new FastHashMap();
private static final FastHashMap NAMED_INSTANCES = new FastHashMap();
private static final NamingListener LISTENER = new NamespaceChangeListener() {
public void objectAdded(NamingEvent evt) {
log.debug( "A factory was successfully bound to name: " + evt.getNewBinding().getName() );
}
public void objectRemoved(NamingEvent evt) {
String name = evt.getOldBinding().getName();
log.info("A factory was unbound from name: " + name);
Object instance = NAMED_INSTANCES.remove(name);
Iterator iter = INSTANCES.values().iterator();
while ( iter.hasNext() ) {
if ( iter.next()==instance ) iter.remove();
}
}
public void objectRenamed(NamingEvent evt) {
String name = evt.getOldBinding().getName();
log.info("A factory was renamed from name: " + name);
NAMED_INSTANCES.put( evt.getNewBinding().getName(), NAMED_INSTANCES.remove(name) );
}
public void namingExceptionThrown(NamingExceptionEvent evt) {
log.warn( "Naming exception occurred accessing factory: " + evt.getException() );
}
};
public Object getObjectInstance(Object reference, Name name, Context ctx, Hashtable env) throws Exception {
log.debug("JNDI lookup: " + name);
String uid = (String) ( (Reference) reference ).get(0).getContent();
return getInstance(uid);
}
public static void addInstance(String uid, String name, SessionFactory instance, Properties properties) {
log.debug("registered: " + uid + " (" + ( (name==null) ? "unnamed" : name ) + ')');
INSTANCES.put(uid, instance);
if (name!=null) NAMED_INSTANCES.put(name, instance);
//must add to JNDI _after_ adding to HashMaps, because some JNDI servers use serialization
if (name==null) {
log.info("Not binding factory to JNDI, no JNDI name configured");
}
else {
log.info("Factory name: " + name);
try {
Context ctx = NamingHelper.getInitialContext(properties);
NamingHelper.bind(ctx, name, instance);
log.info("Bound factory to JNDI name: " + name);
( (EventContext) ctx ).addNamingListener(name, EventContext.OBJECT_SCOPE, LISTENER);
}
catch (InvalidNameException ine) {
log.error("Invalid JNDI name: " + name, ine);
}
catch (NamingException ne) {
log.warn("Could not bind factory to JNDI", ne);
}
catch(ClassCastException cce) {
log.warn("InitialContext did not implement EventContext");
}
}
}
public static void removeInstance(String uid, String name, Properties properties) {
//TODO: theoretically non-threadsafe...
if (name!=null) {
log.info("Unbinding factory from JNDI name: " + name);
try {
Context ctx = NamingHelper.getInitialContext(properties);
ctx.unbind(name);
log.info("Unbound factory from JNDI name: " + name);
}
catch (InvalidNameException ine) {
log.error("Invalid JNDI name: " + name, ine);
}
catch (NamingException ne) {
log.warn("Could not unbind factory from JNDI", ne);
}
NAMED_INSTANCES.remove(name);
}
INSTANCES.remove(uid);
}
public static Object getNamedInstance(String name) {
log.debug("lookup: name=" + name);
Object result = NAMED_INSTANCES.get(name);
if (result==null) {
log.debug("Not found: " + name);
log.debug(NAMED_INSTANCES);
}
return result;
}
public static Object getInstance(String uid) {
log.debug("lookup: uid=" + uid);
Object result = INSTANCES.get(uid);
if (result==null) {
log.debug("Not found: " + uid);
log.debug(INSTANCES);
}
return result;
}
}
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