/*
* Copyright 2005, 2006 Gregory Block, Ralf Joachim
*
* Licensed 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.
*/
package org.castor.cache.hashbelt.container;
import java.util.ArrayList;
import java.util.Iterator;
import java.util.concurrent.ConcurrentHashMap;
/**
* A very basic, HashMap-based implementation of the hashmap container strategy,
* using nothing more than a basic hashmap to store key/value pairs. This works
* well for lots of gets and a reasonably high volume of removes; if few removes
* are required, and iterators are important to your particluar use-case of the
* cache, it's better to use the FastIteratingContainer, which can handle
* iterating at a higher speed, still has a map for accessing hash values, but has
* a higher removal cost.
*
* @author <a href="mailto:gblock AT ctoforaday DOT com">Gregory Block</a>
* @author <a href="mailto:ralf DOT joachim AT syscon DOT eu">Ralf Joachim</a>
* @version $Revision$ $Date: 2006-04-25 16:09:10 -0600 (Tue, 25 Apr 2006) $
* @since 1.0
*/
public final class MapContainer
extends ConcurrentHashMap<Object, Object>
implements Container {
//--------------------------------------------------------------------------
/** SerialVersionUID. */
private static final long serialVersionUID = -7215860376133906243L;
/** Timestamp of this container. */
private long _timestamp = 0;
//--------------------------------------------------------------------------
// additional operations of container interface
/**
* {@inheritDoc}
*/
public void updateTimestamp() { _timestamp = System.currentTimeMillis(); }
/**
* {@inheritDoc}
*/
public long getTimestamp() { return _timestamp; }
/**
* {@inheritDoc}
*/
public Iterator<Object> keyIterator() {
return new ArrayList<Object>(keySet()).iterator();
}
/**
* {@inheritDoc}
*/
public Iterator<Object> valueIterator() {
return new ArrayList<Object>(values()).iterator();
}
//--------------------------------------------------------------------------
}