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Posted to ojb-dev@db.apache.org by ma...@apache.org on 2003/08/05 23:13:09 UTC
cvs commit: db-ojb/src/java/org/apache/ojb/broker/cache AttributeBasedObjectCacheImpl.java
mattbaird 2003/08/05 14:13:09
Added: src/java/org/apache/ojb/broker/cache
AttributeBasedObjectCacheImpl.java
Log:
new attribute based cache per class. Just add an attribute cacheClass="some value"
Revision Changes Path
1.1 db-ojb/src/java/org/apache/ojb/broker/cache/AttributeBasedObjectCacheImpl.java
Index: AttributeBasedObjectCacheImpl.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 org.apache.ojb.broker.Identity;
import org.apache.ojb.broker.PersistenceBroker;
import org.apache.ojb.broker.metadata.ClassDescriptor;
import org.apache.ojb.broker.metadata.MetadataManager;
import org.apache.ojb.broker.util.logging.Logger;
import org.apache.ojb.broker.util.logging.LoggerFactory;
import java.util.HashMap;
import java.util.Iterator;
import java.util.Map;
/**
* reads the attribute from the class descriptor to find the appropriate cache to use.
*
* @author Matthew Baird (mattbaird@yahoo.com)
*/
public class AttributeBasedObjectCacheImpl implements ObjectCache
{
private Logger logger = LoggerFactory.getLogger(AttributeBasedObjectCacheImpl.class);
private Map m_caches = new HashMap();
private ObjectCache m_defaultCache;
private PersistenceBroker m_broker;
private static final String CACHE_CLASS_ATTRIBUTE_NAME = "cacheClass";
public AttributeBasedObjectCacheImpl()
{
}
/**
* public Default Constructor
*/
public AttributeBasedObjectCacheImpl(PersistenceBroker broker)
{
m_broker = broker;
m_defaultCache = new ObjectCacheDefaultImpl(broker);
}
public void cache(Identity oid, Object obj)
{
ObjectCache cache = getCacheForClass(oid.getObjectsRealClass());
cache.cache(oid, obj);
}
public Object lookup(Identity oid)
{
ObjectCache cache = getCacheForClass(oid.getObjectsRealClass());
return cache.lookup(oid);
}
public void remove(Identity oid)
{
ObjectCache cache = getCacheForClass(oid.getObjectsRealClass());
cache.remove(oid);
}
public void clear()
{
/**
* first be nice to the GC and clear each internal cache.
*/
Iterator it = m_caches.values().iterator();
ObjectCache oc = null;
while (it.hasNext())
{
oc = (ObjectCache) it.next();
oc.clear();
}
/**
* then call clear on the caches hashmap.
*/
m_caches.clear();
}
private ObjectCache getCacheForClass(Class clazz)
{
ObjectCache retval = null;
retval = (ObjectCache) m_caches.get(clazz);
if (retval == null)
{
// lookup type and create
ClassDescriptor cd = MetadataManager.getInstance().getGlobalRepository().getDescriptorFor(clazz);
String cacheClass = cd.getAttribute(CACHE_CLASS_ATTRIBUTE_NAME);
if (cacheClass != null && cacheClass.trim().length() > 0)
{
try
{
retval = (ObjectCache) Class.forName(cacheClass).newInstance();
}
catch (InstantiationException e)
{
logger.error("AttributeBasedObjectCacheImpl caught an InstantiationException for class type: " + cacheClass);
}
catch (IllegalAccessException e)
{
logger.error("AttributeBasedObjectCacheImpl caught an IllegalAccessException for class type: " + cacheClass);
}
catch (ClassNotFoundException e)
{
logger.error("AttributeBasedObjectCacheImpl caught an ClassNotFoundException for class type: " + cacheClass);
}
}
/**
* handle all cases of failure
*/
if (retval == null)
{
retval = m_defaultCache;
}
m_caches.put(clazz, retval);
}
return retval;
}
}
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