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Hibernate example source code file (Region.java)

This example Hibernate source code file (Region.java) is included in the DevDaily.com "Java Source Code Warehouse" project. The intent of this project is to help you "Learn Java by Example" TM.

Java - Hibernate tags/keywords

cacheexception, cacheexception, map, map, region, region, string, string, util

The Hibernate Region.java source code

/*
 * Hibernate, Relational Persistence for Idiomatic Java
 *
 * Copyright (c) 2008-2011, Red Hat Inc. or third-party contributors as
 * indicated by the @author tags or express copyright attribution
 * statements applied by the authors.  All third-party contributions are
 * distributed under license by Red Hat Inc.
 *
 * This copyrighted material is made available to anyone wishing to use, modify,
 * copy, or redistribute it subject to the terms and conditions of the GNU
 * Lesser General Public License, as published by the Free Software Foundation.
 *
 * This program is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY
 * or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU Lesser General Public License
 * for more details.
 *
 * You should have received a copy of the GNU Lesser General Public License
 * along with this distribution; if not, write to:
 * Free Software Foundation, Inc.
 * 51 Franklin Street, Fifth Floor
 * Boston, MA  02110-1301  USA
 */
package org.hibernate.cache.spi;

import java.util.Map;

import org.hibernate.cache.CacheException;

/**
 * Defines a contract for accessing a particular named region within the 
 * underlying cache implementation.
 *
 * @author Steve Ebersole
 */
public interface Region {
	/**
	 * Retrieve the name of this region.
	 *
	 * @return The region name
	 */
	public String getName();

	/**
	 * The "end state" contract of the region's lifecycle.  Called
	 * during {@link org.hibernate.SessionFactory#close()} to give
	 * the region a chance to cleanup.
	 *
	 * @throws org.hibernate.cache.CacheException Indicates problem shutting down
	 */
	public void destroy() throws CacheException;

	/**
	 * Determine whether this region contains data for the given key.
	 * <p/>
	 * The semantic here is whether the cache contains data visible for the
	 * current call context.  This should be viewed as a "best effort", meaning
	 * blocking should be avoid if possible.
	 *
	 * @param key The cache key
	 *
	 * @return True if the underlying cache contains corresponding data; false
	 * otherwise.
	 */
	public boolean contains(Object key);

	/**
	 * 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();

	/**
	 * Get the contents of this region as a map.
	 * <p/>
	 * Implementors which do not support this notion
	 * should simply return an empty map.
	 *
	 * @return The content map.
	 */
	public Map toMap();

	public long nextTimestamp();
	public int getTimeout();
}

Other Hibernate examples (source code examples)

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