/*
* #!
* Ontopia Engine
* #-
* Copyright (C) 2001 - 2013 The Ontopia Project
* #-
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
* !#
*/
package net.ontopia.utils;
import java.util.HashMap;
import java.util.HashSet;
import java.util.Iterator;
import java.util.Map;
import java.util.Set;
/**
* INTERNAL: A manager class that manages cached objects. Cached objects
* can be registered with the cache manager in order to follow the
* life cycle set by the environment using the cache manager. The
* cached objects must implement the CachedIF interface.</p>
*
* Note that this class also implements the CachedIF interface, so
* that it can itself be fully refreshed and also be managed by other
* cache managers.</p>
*/
public class CacheManager implements CachedIF {
protected Map<Object, Set<CachedIF>> caches = new HashMap<Object, Set<CachedIF>>();
public Set<Object> getGroups() {
return caches.keySet();
}
public Set<CachedIF> getCached(Object group) {
return caches.get(group);
}
public void addCached(CachedIF cached, Object group) {
if (!caches.containsKey(group)) caches.put(group, new HashSet<CachedIF>());
caches.get(group).add(cached);
}
public void removeCached(CachedIF cached, Object group) {
Set<CachedIF> grouped = caches.get(group);
// todo: correct fix?
grouped.remove(cached);
if (grouped.isEmpty())
caches.remove(group);
}
public void refresh(Object group) {
if (!caches.containsKey(group)) return;
Iterator<CachedIF> iter = caches.get(group).iterator();
while (iter.hasNext()) {
CachedIF cached = iter.next();
cached.refresh();
}
}
public void refresh() {
Iterator<Object> iter1 = caches.keySet().iterator();
while (iter1.hasNext()) {
Object group = iter1.next();
Iterator<CachedIF> iter2 = caches.get(group).iterator();
while (iter2.hasNext()) {
CachedIF cached = iter2.next();
cached.refresh();
}
}
}
}