/*
 * Copyright (C) 2009 eXo Platform SAS.
 *
 * This is free software; you can redistribute it and/or modify it
 * under the terms of the GNU Lesser General Public License as
 * published by the Free Software Foundation; either version 2.1 of
 * the License, or (at your option) any later version.
 *
 * This software 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 software; if not, write to the Free
 * Software Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA
 * 02110-1301 USA, or see the FSF site: http://www.fsf.org.
 */
package org.etk.component.database.impl;

import org.etk.kernel.cache.ExoCache;
import org.hibernate.cache.Cache;
import org.hibernate.cache.CacheException;
import org.hibernate.cache.Timestamper;

import java.io.Serializable;
import java.util.Map;

/**
 * Jul 17, 2004
 * 
 * @author: Tuan Nguyen
 * @email: tuan08@users.sourceforge.net
 * @version: $Id: ExoCachePlugin.java,v 1.1 2004/08/29 21:47:58 benjmestrallet
 *           Exp $
 */
public class ExoCachePlugin implements Cache {

  private ExoCache<Serializable, Object> cache_;

  public ExoCachePlugin(ExoCache<Serializable, Object> cache) {
    cache_ = cache;
  }

  /**
   * {@inheritDoc}
   */
  public Object get(Object key) throws CacheException {
    try {
      return cache_.get((Serializable) key);
    } catch (Exception ex) {
      throw new CacheException(ex);
    }
  }

  /**
   * Get an item from the cache
   * 
   * @param key
   * @return the cached object or <tt>null</tt>
   * @throws CacheException
   */
  public Object read(Object key) throws CacheException {
    return get(key);
  }

  /**
   * {@inheritDoc}
   */
  public void put(Object key, Object value) throws CacheException {
    try {
      cache_.put((Serializable) key, (Serializable) value);
    } catch (Exception ex) {
      throw new CacheException(ex);
    }
  }

  /**
   * Add an item to the cache
   * 
   * @param key
   * @param value
   * @throws CacheException
   */
  public void update(Object key, Object value) throws CacheException {
    put(key, value);
  }

  /**
   * {@inheritDoc}
   */
  public void remove(Object key) throws CacheException {
    try {
      cache_.remove((Serializable) key);
    } catch (Exception ex) {
      throw new CacheException(ex);
    }
  }

  /**
   * {@inheritDoc}
   */
  public void clear() throws CacheException {
    try {
      cache_.clearCache();
    } catch (Exception ex) {
      throw new CacheException(ex);
    }
  }

  /**
   * {@inheritDoc}
   */
  public void destroy() throws CacheException {
  }

  /**
   * {@inheritDoc}
   */
  public void lock(Object key) throws CacheException {
  }

  /**
   * {@inheritDoc}
   */
  public void unlock(Object key) throws CacheException {
  }

  /**
   * {@inheritDoc}
   */
  public long nextTimestamp() {
    return Timestamper.next();
  }

  /**
   * Returns the lock timeout for this cache.
   */
  public int getTimeout() {
    return Timestamper.ONE_MS * 60000;
  }

  /**
   * Get the name of the cache region
   */
  public String getRegionName() {
    return cache_.getName();
  }

  /**
   * 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() {
    return -1;
  }

  /**
   * 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() {
    return -1;
  }

  /**
   * 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() {
    return -1;
  }

  /**
   * optional operation
   */
  @SuppressWarnings("unchecked")
  public Map toMap() {
    return null;
  }

}