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/**
* This file is part of the CRISTAL-iSE kernel.
* Copyright (c) 2001-2014 The CRISTAL Consortium. All rights reserved.
*
* This library 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 3 of the License, or (at
* your option) any later version.
*
* This library is distributed in the hope that it will be useful, but WITHOUT
* ANY WARRANTY; with out 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 library; if not, write to the Free Software Foundation,
* Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA.
*
* http://www.fsf.org/licensing/licenses/lgpl.html
*/
/**
*
*/
package org.cristalise.kernel.utils;
import org.cristalise.kernel.common.InvalidDataException;
import org.cristalise.kernel.common.ObjectNotFoundException;
import org.cristalise.kernel.entity.proxy.ItemProxy;
import org.cristalise.kernel.entity.proxy.MemberSubscription;
import org.cristalise.kernel.entity.proxy.ProxyObserver;
import org.cristalise.kernel.persistency.ClusterStorage;
import org.cristalise.kernel.persistency.outcome.Viewpoint;
public abstract class DescriptionObjectCache<D extends DescriptionObject> {
SoftCache<String, CacheEntry<D>> cache = new SoftCache<String, CacheEntry<D>>();
public D get(String name, int version) throws ObjectNotFoundException, InvalidDataException {
D thisDef;
synchronized(cache) {
CacheEntry<D> thisDefEntry = cache.get(name+"_"+version);
if (thisDefEntry == null) {
Logger.msg(6, name+" v"+version+" not found in cache. Retrieving.");
ItemProxy defItem = LocalObjectLoader.loadLocalObjectDef(getDefRoot(), name);
thisDef = loadObject(name, version, defItem);
cache.put(name+"_"+version, new CacheEntry<D>(thisDef, defItem, this));
}
else {
Logger.msg(6, name+" v"+version+" found in cache.");
thisDef = thisDefEntry.def;
}
}
return thisDef;
}
public abstract String getDefRoot();
public abstract D loadObject(String name, int version, ItemProxy proxy) throws ObjectNotFoundException, InvalidDataException;
public void removeObject(String id) {
synchronized(cache) {
if (cache.keySet().contains(id)) {
Logger.msg(7, "ActDefCache: Removing activity def "+id+" from cache");
cache.remove(id);
}
}
}
public class CacheEntry<E extends DescriptionObject> implements ProxyObserver<Viewpoint> {
public String id;
public ItemProxy proxy;
public E def;
public DescriptionObjectCache<E> parent;
public CacheEntry(E def, ItemProxy proxy, DescriptionObjectCache<E> parent) {
this.id = def.getName()+"_"+def.getVersion();
this.def = def;
this.parent = parent;
this.proxy = proxy;
proxy.subscribe(new MemberSubscription<Viewpoint>(this, ClusterStorage.VIEWPOINT, false));
}
@Override
public void finalize() {
parent.removeObject(id);
proxy.unsubscribe(this);
}
@Override
public void add(Viewpoint contents) {
parent.removeObject(id);
}
@Override
public void remove(String oldId) {
parent.removeObject(oldId);
}
@Override
public String toString() {
return "Cache entry: "+id;
}
@Override
public void control(String control, String msg) {
}
}
}
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