/*
* Galaxy
* Copyright (c) 2012-2014, Parallel Universe Software Co. All rights reserved.
*
* This program and the accompanying materials are dual-licensed under
* either the terms of the Eclipse Public License v1.0 as published by
* the Eclipse Foundation
*
* or (per the licensee's choosing)
*
* under the terms of the GNU Lesser General Public License version 3.0
* as published by the Free Software Foundation.
*/
package co.paralleluniverse.galaxy.objects;
import co.paralleluniverse.galaxy.Cache;
import co.paralleluniverse.galaxy.CacheListener;
/**
* Wraps T and implements Distributed interface
*
* @author eitan
* @param <T>
*/
public class DistributedReferenceStore<R extends DistributedReference<T>, T> {
private final Cache cache;
public DistributedReferenceStore(Cache cache) {
this.cache = cache;
}
public R newRef(long id, T obj) {
if (id <= 0)
return null;
assert cache.getListener(id) == null;
R ref = createRef(id, obj);
cache.setListener(id, ref);
return ref;
}
public R getOrCreateRef(long id) {
if (id <= 0)
return null;
CacheListener ref = cache.getListener(id);
return (R) (ref != null ? ref : cache.setListenerIfAbsent(id, createRef(id, null)));
}
protected R createRef(long id, T obj) {
return (R) new DistributedReference<T>(id, obj);
}
public static <T> DistributedReference<T> newRef(Cache cache, long id, T obj) {
if (id <= 0)
return null;
assert cache.getListener(id) == null;
DistributedReference<T> ref = new DistributedReference<T>(id, obj);
cache.setListener(id, ref);
return ref;
}
public static <T> DistributedReference<T> getOrCreateRef(Cache cache, long id) {
if (id <= 0)
return null;
CacheListener ref = cache.getListener(id);
return (DistributedReference<T>) (ref != null ? ref : cache.setListenerIfAbsent(id, new DistributedReference<T>(id, null)));
}
}