package org.apache.velocity.runtime.resource;
/*
* 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 java.util.Iterator;
import org.apache.velocity.runtime.RuntimeServices;
/**
* Interface that defines the shape of a pluggable resource cache
* for the included ResourceManager
*
* @author <a href="mailto:[email protected]">Geir Magnusson Jr.</a>
* @version $Id: ResourceCache.java 463298 2006-10-12 16:10:32Z henning $
*/
public interface ResourceCache
{
/**
* initializes the ResourceCache. Will be
* called before any utilization
*
* @param rs RuntimeServices to use for logging, etc
*/
public void initialize( RuntimeServices rs );
/**
* retrieves a Resource from the
* cache
*
* @param resourceKey key for Resource to be retrieved
* @return Resource specified or null if not found
*/
public Resource get( Object resourceKey );
/**
* stores a Resource in the cache
*
* @param resourceKey key to associate with the Resource
* @param resource Resource to be stored
* @return existing Resource stored under this key, or null if none
*/
public Resource put( Object resourceKey, Resource resource );
/**
* removes a Resource from the cache
*
* @param resourceKey resource to be removed
* @return stored under key
*/
public Resource remove( Object resourceKey );
/**
* returns an Iterator of Keys in the cache.
* @return An Iterator of Keys in the cache.
*/
public Iterator enumerateKeys();
}
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