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//$Id: Cache.java 6478 2005-04-21 07:57:19Z oneovthafew $
package org.hibernate.cache;
import java.util.Map;
/**
* Implementors define a caching algorithm. All implementors
* must be threadsafe.
*/
public interface Cache {
/**
* Get an item from the cache
* @param key
* @return the cached object or null
* @throws CacheException
*/
public Object read(Object key) throws CacheException;
/**
* Get an item from the cache, nontransactionally
* @param key
* @return the cached object or null
* @throws CacheException
*/
public Object get(Object key) throws CacheException;
/**
* Add an item to the cache, nontransactionally, with
* failfast semantics
* @param key
* @param value
* @throws CacheException
*/
public void put(Object key, Object value) throws CacheException;
/**
* Add an item to the cache
* @param key
* @param value
* @throws CacheException
*/
public void update(Object key, Object value) throws CacheException;
/**
* Remove an item from the cache
*/
public void remove(Object key) throws CacheException;
/**
* Clear the cache
*/
public void clear() throws CacheException;
/**
* Clean up
*/
public void destroy() throws CacheException;
/**
* If this is a clustered cache, lock the item
*/
public void lock(Object key) throws CacheException;
/**
* If this is a clustered cache, unlock the item
*/
public void unlock(Object key) throws CacheException;
/**
* Generate a timestamp
*/
public long nextTimestamp();
/**
* Get a reasonable "lock timeout"
*/
public int getTimeout();
/**
* Get the name of the cache region
*/
public String getRegionName();
/**
* The number of bytes is this cache region currently consuming in memory.
*
* @return The number of bytes consumed by this region; -1 if unknown or
* unsupported.
*/
public long getSizeInMemory();
/**
* The count of entries currently contained in the regions in-memory store.
*
* @return The count of entries in memory; -1 if unknown or unsupported.
*/
public long getElementCountInMemory();
/**
* The count of entries currently contained in the regions disk store.
*
* @return The count of entries on disk; -1 if unknown or unsupported.
*/
public long getElementCountOnDisk();
/**
* optional operation
*/
public Map toMap();
}