/* | |
* Copyright 2005-2008 Jeremy Haile, Les Hazlewood | |
* | |
* 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 org.jsecurity.cache; | |
import java.util.Set; | |
/** | |
* A Cache efficiently stores temporary objects primarily to improve an application's performance. | |
* | |
* <p>JSecurity doesn't implement a full Cache mechanism itself, since that is outside the core competency of a | |
* Security framework. Instead, this interface provides an abstraction (wrapper) API on top of an underlying | |
* cache framework's cache instance (e.g. JCache, Ehcache, JCS, OSCache, JBossCache, TerraCotta, Coherence, | |
* GigaSpaces, etc, etc), allowing a JSecurity user to configure any cache mechanism they choose. | |
* | |
* @author Les Hazlewood | |
* @author Jeremy Haile | |
* @since 0.2 | |
*/ | |
public interface Cache { | |
/** | |
* Returns the Cached value stored under the specified <code>key</code> or | |
* <code>null</code> if there is no Cache entry for that <code>key</code>. | |
* | |
* @param key the key that the value was previous added with | |
* @return the cached object or <tt>null</tt> if there is no Cache entry for the specified <code>key</code> | |
* @throws CacheException if there is a problem accessing the underlying cache system | |
*/ | |
public Object get( Object key ) throws CacheException; | |
/** | |
* Adds a Cache entry. | |
* | |
* @param key the key used to identify the object being stored. | |
* @param value the value to be stored in the cache. | |
* @throws CacheException if there is a problem accessing the underlying cache system | |
*/ | |
public void put( Object key, Object value ) throws CacheException; | |
/** | |
* Remove the cache entry corresponding to the specified key. | |
* | |
* @param key the key of the entry to be removed. | |
* @throws CacheException if there is a problem accessing the underlying cache system | |
*/ | |
public void remove( Object key ) throws CacheException; | |
/** | |
* Clear all entries from the cache. | |
* @throws CacheException if there is a problem accessing the underlying cache system | |
*/ | |
public void clear() throws CacheException; | |
/** | |
* Returns the number of entries in the cache. | |
* @return the number of entries in the cache. | |
*/ | |
public int size(); | |
/** | |
* Returns a view of all the keys for entries contained in this cache. | |
* @return a view of all the keys for entries contained in this cache. | |
*/ | |
public Set keys(); | |
/** | |
* Returns a view of all of the values contained in this cache. | |
* @return a view of all of the values contained in this cache. | |
*/ | |
public Set values(); | |
} |