blob: d5c788594478e1c1f056c7719bbce436c51c47da [file] [log] [blame]
package org.apache.jcs;
/*
* Licensed to the Apache Software Foundation (ASF) under one
* or more contributor license agreements. See the NOTICE file
* distributed with this work for additional information
* regarding copyright ownership. The ASF licenses this file
* to you under the Apache License, Version 2.0 (the
* "License"); you may not use this file except in compliance
* with the License. You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing,
* software distributed under the License is distributed on an
* "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
* KIND, either express or implied. See the License for the
* specific language governing permissions and limitations
* under the License.
*/
import org.apache.jcs.access.GroupCacheAccess;
import org.apache.jcs.access.exception.CacheException;
import org.apache.jcs.engine.behavior.ICompositeCacheAttributes;
import org.apache.jcs.engine.control.CompositeCache;
import org.apache.jcs.engine.control.CompositeCacheManager;
/**
* Simple class for using JCS. To use JCS in your application, you can use the static methods of
* this class to get access objects (instances of this class) for your cache regions. Ideally this
* class should be all you need to import to use JCS. One JCS should be created for each region you
* want to access. If you have several regions, then get instances for each. For best performance
* the getInstance call should be made in an initialization method.
*/
public class JCS
extends GroupCacheAccess
{
/** cache.ccf alternative. */
private static String configFilename = null;
/** The manager returns cache instances. */
private static CompositeCacheManager cacheMgr;
/**
* Protected constructor for use by the static factory methods.
* <p>
* @param cacheControl Cache which the instance will provide access to
*/
protected JCS( CompositeCache cacheControl )
{
super( cacheControl );
}
/**
* Get a JCS which accesses the provided region.
* <p>
* @param region Region that return JCS will provide access to
* @return A JCS which provides access to a given region.
* @exception CacheException
*/
public static JCS getInstance( String region )
throws CacheException
{
ensureCacheManager();
return new JCS( cacheMgr.getCache( region ) );
}
/**
* Get a JCS which accesses the provided region.
* <p>
* @param region Region that return JCS will provide access to
* @param icca CacheAttributes for region
* @return A JCS which provides access to a given region.
* @exception CacheException
*/
public static JCS getInstance( String region, ICompositeCacheAttributes icca )
throws CacheException
{
ensureCacheManager();
return new JCS( cacheMgr.getCache( region, icca ) );
}
/**
* Gets an instance of CompositeCacheManager and stores it in the cacheMgr class field, if it is
* not already set. Unlike the implementation in CacheAccess, the cache manager is a
* CompositeCacheManager. NOTE: This can will be moved up into GroupCacheAccess.
*/
protected static synchronized void ensureCacheManager()
{
if ( cacheMgr == null )
{
if ( configFilename == null )
{
cacheMgr = CompositeCacheManager.getInstance();
}
else
{
cacheMgr = CompositeCacheManager.getUnconfiguredInstance();
cacheMgr.configure( configFilename );
}
}
}
/**
* Set the filename that the cache manager will be initialized with. Only matters before the
* instance is initialized.
* <p>
* @param configFilename
*/
public static void setConfigFilename( String configFilename )
{
JCS.configFilename = configFilename;
}
}