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/**
*
*/
package com.c2kernel.utils;
import com.c2kernel.common.InvalidDataException;
import com.c2kernel.common.ObjectNotFoundException;
import com.c2kernel.entity.proxy.ProxyObserver;
import com.c2kernel.entity.proxy.ItemProxy;
import com.c2kernel.entity.proxy.MemberSubscription;
import com.c2kernel.persistency.ClusterStorage;
import com.c2kernel.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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