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61 lines
2.0 KiB
61 lines
2.0 KiB
7 years ago
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/*
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* Copyright (c) 2008, 2009, 2011 Oracle, Inc. All rights reserved.
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*
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* This program and the accompanying materials are made available under the
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* terms of the Eclipse Public License v1.0 and Eclipse Distribution License v. 1.0
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* which accompanies this distribution. The Eclipse Public License is available
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* at http://www.eclipse.org/legal/epl-v10.html and the Eclipse Distribution License
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* is available at http://www.eclipse.org/org/documents/edl-v10.php.
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*/
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package com.fr.third.javax.persistence;
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/**
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* Interface used to interact with the second-level cache.
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* If a cache is not in use, the methods of this interface have
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* no effect, except for <code>contains</code>, which returns false.
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*
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* @since Java Persistence 2.0
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*/
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public interface Cache {
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/**
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* Whether the cache contains data for the given entity.
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* @param cls entity class
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* @param primaryKey primary key
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* @return boolean indicating whether the entity is in the cache
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*/
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public boolean contains(Class cls, Object primaryKey);
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/**
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* Remove the data for the given entity from the cache.
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* @param cls entity class
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* @param primaryKey primary key
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*/
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public void evict(Class cls, Object primaryKey);
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/**
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* Remove the data for entities of the specified class (and its
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* subclasses) from the cache.
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* @param cls entity class
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*/
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public void evict(Class cls);
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/**
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* Clear the cache.
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*/
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public void evictAll();
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/**
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* Return an object of the specified type to allow access to the provider-specific API.
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*
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* If the provider's Cache implementation does not support the specified class, the
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* PersistenceException is thrown.
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* @param cls the class of the object to be returned. This is normally either the
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* underlying Cache implementation class or an interface that it implements.
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* @return an instance of the specified class
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* @throws PersistenceException if the provider does not support the call
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*/
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public <T> T unwrap(Class<T> cls);
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}
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