cvs commit: db-ojb/src/java/org/apache/ojb/broker/cache ObjectCachePerBrokerImpl.java

[th...@apache.org]

thma        2003/02/09 12:13:42

  Added:       src/java/org/apache/ojb/broker/cache
                        ObjectCachePerBrokerImpl.java
  Log:
  provide new cache implementation providing per broker sub-caches
  
  Revision  Changes    Path
  1.1                  db-ojb/src/java/org/apache/ojb/broker/cache/ObjectCachePerBrokerImpl.java
  
  Index: ObjectCachePerBrokerImpl.java
  ===================================================================
  package org.apache.ojb.broker.cache;
  /* ====================================================================
   * The Apache Software License, Version 1.1
   *
   * Copyright (c) 2001 The Apache Software Foundation.  All rights
   * reserved.
   *
   * Redistribution and use in source and binary forms, with or without
   * modification, are permitted provided that the following conditions
   * are met:
   *
   * 1. Redistributions of source code must retain the above copyright
   *    notice, this list of conditions and the following disclaimer.
   *
   * 2. Redistributions in binary form must reproduce the above copyright
   *    notice, this list of conditions and the following disclaimer in
   *    the documentation and/or other materials provided with the
   *    distribution.
   *
   * 3. The end-user documentation included with the redistribution,
   *    if any, must include the following acknowledgment:
   *       "This product includes software developed by the
   *        Apache Software Foundation (http://www.apache.org/)."
   *    Alternately, this acknowledgment may appear in the software itself,
   *    if and wherever such third-party acknowledgments normally appear.
   *
   * 4. The names "Apache" and "Apache Software Foundation" and
   *    "Apache ObjectRelationalBridge" must not be used to endorse or promote products
   *    derived from this software without prior written permission. For
   *    written permission, please contact apache@apache.org.
   *
   * 5. Products derived from this software may not be called "Apache",
   *    "Apache ObjectRelationalBridge", nor may "Apache" appear in their name, without
   *    prior written permission of the Apache Software Foundation.
   *
   * THIS SOFTWARE IS PROVIDED ``AS IS'' AND ANY EXPRESSED OR IMPLIED
   * WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
   * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
   * DISCLAIMED.  IN NO EVENT SHALL THE APACHE SOFTWARE FOUNDATION OR
   * ITS CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
   * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
   * LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF
   * USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND
   * ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,
   * OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT
   * OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
   * SUCH DAMAGE.
   * ====================================================================
   *
   * This software consists of voluntary contributions made by many
   * individuals on behalf of the Apache Software Foundation.  For more
   * information on the Apache Software Foundation, please see
   * <http://www.apache.org/>.
   */
  
  import java.util.HashMap;
  
  import org.apache.ojb.broker.Identity;
  import org.apache.ojb.broker.PBKey;
  import org.apache.ojb.broker.PersistenceBroker;
  import org.apache.ojb.broker.metadata.ClassNotPersistenceCapableException;
  import org.apache.ojb.broker.singlevm.PersistenceBrokerThreadMapping;
  
  /**
   * This cache implementation allows to have dedicated caches per broker.
   * All calls are delegated to the cache associated with the currentBroker.
   * The Broker lookup is done with the PersistenceBrokerThreadMapping.
   * @author Thomas Mahler
   */
  public class ObjectCachePerBrokerImpl implements ObjectCache
  {
  	/**
  	 * the map holding all broker caches
  	 */
  	private HashMap brokerMap;
  	
  	/**
  	 * lookup the currently active broker from the PersistenceBrokerThreadMapping
  	 */
  	protected synchronized ObjectCache getCacheForCurrentBroker()
  	{
  		PersistenceBroker currentBroker = PersistenceBrokerThreadMapping.currentDefaultPersistenceBroker();			
  		PBKey key = currentBroker.getPBKey();
  		
  		ObjectCache result = (ObjectCache) brokerMap.get(key);
  		if (result == null)
  		{
  			result = new ObjectCacheDefaultImpl();
  			brokerMap.put(key, result);	
  		}
  		return result;
  	}
  	
      /**
       * Constructor for ObjectCachePerBrokerImpl.
       */
      public ObjectCachePerBrokerImpl()
      {
          super();
          brokerMap = new HashMap();
      }
  
      /**
       * @see org.apache.ojb.broker.cache.ObjectCache#cache(Object)
       */
      public void cache(Object obj) throws ClassNotPersistenceCapableException
      {
      	getCacheForCurrentBroker().cache(obj);
      }
  
      /**
       * @see org.apache.ojb.broker.cache.ObjectCache#cache(Identity, Object)
       */
      public void cache(Identity oid, Object obj)
      {
      	getCacheForCurrentBroker().cache(oid, obj);
      }
  
      /**
       * @see org.apache.ojb.broker.cache.ObjectCache#lookup(Identity)
       */
      public Object lookup(Identity oid)
      {
          return getCacheForCurrentBroker().lookup(oid);
      }
  
      /**
       * @see org.apache.ojb.broker.cache.ObjectCache#remove(Object)
       */
      public void remove(Object obj)
      {
      	getCacheForCurrentBroker().remove(obj);
      }
  
      /**
       * @see org.apache.ojb.broker.cache.ObjectCache#clear()
       */
      public void clear()
      {
      	getCacheForCurrentBroker().clear();
      }
  
  }