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/**************************************************************************
* EntityProxy.java
*
* $Revision: 1.35 $
* $Date: 2005/05/10 11:40:09 $
*
* Copyright (C) 2001 CERN - European Organization for Nuclear Research
* All rights reserved.
**************************************************************************/
package com.c2kernel.entity.proxy;
import java.util.*;
import com.c2kernel.common.ObjectNotFoundException;
import com.c2kernel.entity.*;
import com.c2kernel.persistency.*;
import com.c2kernel.process.Gateway;
import com.c2kernel.property.Property;
import com.c2kernel.utils.*;
/******************************************************************************
* It is a wrapper for the connection and communication with Entities.
* It can cache data loaded from the Entity to reduce communication with it.
* This cache is syncronised with corresponding Entity through an event mechanism.
*
* @version $Revision: 1.35 $ $Date: 2005/05/10 11:40:09 $
* @author $Author: abranson $
******************************************************************************/
abstract public class EntityProxy implements ManageableEntity
{
protected ManageableEntity mEntity = null;
protected org.omg.CORBA.Object mIOR;
protected int mSystemKey;
private HashMap mSubscriptions;
/**************************************************************************
*
**************************************************************************/
protected EntityProxy( org.omg.CORBA.Object ior,
int systemKey)
throws ObjectNotFoundException
{
Logger.msg(8,"EntityProxy::EntityProxy() - Initialising '" +systemKey+ "' entity");
initialise( ior, systemKey);
}
/**************************************************************************
*
**************************************************************************/
private void initialise( org.omg.CORBA.Object ior,
int systemKey)
throws ObjectNotFoundException
{
Logger.msg(8, "EntityProxy::initialise() - Initialising '" +systemKey+ "' entity");
mIOR = ior;
mSystemKey = systemKey;
mSubscriptions = new HashMap();
}
/**************************************************************************
*
**************************************************************************/
public ManageableEntity getEntity() throws ObjectNotFoundException
{
if (mEntity == null) {
mEntity = narrow();
}
return mEntity;
}
abstract public ManageableEntity narrow() throws ObjectNotFoundException;
/**************************************************************************
*
**************************************************************************/
//check who is using.. and if toString() is sufficient
public int getSystemKey()
{
return mSystemKey;
}
/**************************************************************************
*
**************************************************************************/
public String queryData( String path )
throws ObjectNotFoundException
{
try {
Logger.msg(7, "EntityProxy.queryData() - "+mSystemKey+"/"+path);
if (path.endsWith("all")) {
Logger.msg(7, "EntityProxy.queryData() - listing contents");
String[] result = Gateway.getStorage().getClusterContents(mSystemKey, path.substring(0, path.length()-3));
StringBuffer retString = new StringBuffer();
for (int i = 0; i < result.length; i++) {
retString.append(result[i]);
if (i<result.length-1) retString.append(",");
}
Logger.msg(7, "EntityProxy.queryData() - "+retString.toString());
return retString.toString();
}
C2KLocalObject target = Gateway.getStorage().get(mSystemKey, path, null);
return CastorXMLUtility.marshall(target);
} catch (ObjectNotFoundException e) {
throw e;
} catch (Exception e) {
Logger.error(e);
return "<ERROR>"+e.getMessage()+"</ERROR>";
}
}
public String[] getContents( String path ) throws ObjectNotFoundException {
try {
return Gateway.getStorage().getClusterContents(mSystemKey, path.substring(0, path.length()));
} catch (ClusterStorageException e) {
throw new ObjectNotFoundException(e.toString());
}
}
/**************************************************************************
*
**************************************************************************/
public C2KLocalObject getObject( String xpath )
throws ObjectNotFoundException
{
// load from storage, falling back to proxy loader if not found in others
try
{
return Gateway.getStorage().get( mSystemKey, xpath , this);
}
catch( ClusterStorageException ex )
{
Logger.msg(4, "Exception loading object :"+mSystemKey+"/"+xpath);
throw new ObjectNotFoundException( ex.toString() );
}
}
public String getProperty( String name )
throws ObjectNotFoundException
{
Logger.msg(5, "Get property "+name+" from syskey/"+mSystemKey);
Property prop = (Property)getObject("Property/"+name);
try
{
return prop.getValue();
}
catch (NullPointerException ex)
{
throw new ObjectNotFoundException();
}
}
public String getName()
{
try {
return getProperty("Name");
} catch (ObjectNotFoundException ex) {
return null;
}
}
/**************************************************************************
* Subscription methods
**************************************************************************/
public void subscribe (EntityProxyObserver observer,
String interest,
boolean preload)
{
MemberSubscription newSub = new MemberSubscription(this, interest, observer, preload);
synchronized (this){
mSubscriptions.put( newSub, observer );
}
new Thread(newSub).start();
Logger.msg(7, "Subscribed "+observer.getClass().getName()+" for "+interest);
}
public void unsubscribe(EntityProxyObserver observer)
{
synchronized (this){
for (Iterator e = mSubscriptions.keySet().iterator(); e.hasNext();) {
MemberSubscription thisSub = (MemberSubscription)e.next();
if (mSubscriptions.get( thisSub ) == observer) {
e.remove();
Logger.msg(7, "Unsubscribed "+observer.getClass().getName());
}
}
}
}
public void dumpSubscriptions(int logLevel) {
if (mSubscriptions.size() == 0) return;
Logger.msg(logLevel, "Subscriptions to proxy "+mSystemKey+":");
synchronized(this) {
for (Iterator iter = mSubscriptions.keySet().iterator(); iter.hasNext();) {
MemberSubscription element = (MemberSubscription)iter.next();
EntityProxyObserver obs = element.getObserver();
if (obs != null)
Logger.msg(logLevel, " "+element.getObserver().getClass().getName()+" subscribed to "+element.interest);
else
Logger.msg(logLevel, " Phantom subscription to "+element.interest);
}
}
}
public void notify(ProxyMessage message) {
Logger.msg(4, "EntityProxy.notify() - Received change notification for "+message.getPath()+" on "+mSystemKey);
synchronized (this){
if (!message.getServer().equals(EntityProxyManager.serverName))
Gateway.getStorage().clearCache(mSystemKey, message.getPath());
for (Iterator e = mSubscriptions.keySet().iterator(); e.hasNext();) {
MemberSubscription newSub = (MemberSubscription)e.next();
if (newSub.getObserver() == null) { // phantom
Logger.msg(4, "Removing phantom subscription to "+newSub.interest);
e.remove();
}
else
newSub.update(message.getPath(), message.getState());
}
}
}
/**
* If this is reaped, clear out the cache for it too.
*/
protected void finalize() throws Throwable {
Logger.msg(7, "Proxy "+mSystemKey+" reaped");
Gateway.getStorage().clearCache(mSystemKey, null);
Gateway.getProxyManager().removeProxy(mSystemKey);
super.finalize();
}
}
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