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What this is

This file is included in the "Java Source Code Warehouse" project. The intent of this project is to help you "Learn Java by Example" TM.

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The source code

// $Header: /home/cvs/jakarta-jmeter/src/protocol/http/org/apache/jmeter/protocol/http/util/,v 1.5 2004/02/12 00:29:49 sebb Exp $
 * Copyright 2003-2004 The Apache Software Foundation.
 * 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
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * See the License for the specific language governing permissions and
 * limitations under the License.

package org.apache.jmeter.protocol.http.util;

import java.util.HashMap;
import org.w3c.dom.Document;

 * The purpose of this class is to cache the DOM Documents in memory and
 * by-pass parsing. For old systems or laptops, it's not practical to parse the
 * XML documents every time. Therefore using a memory cache can reduce the CPU
 * usage.

* For now this is a simple version to test the feasibility of caching. If it * works, this class will be replaced with an Apache commons or something * equivalent. If I was familiar with Apache Commons Pool, I would probably * use it, but since I don't know the API, it is quicker for Proof of Concept * to just write a dumb one. If the number documents in the pool exceed several * hundred, it will take a long time for the lookup. *

* Created on: Jun 17, 2003
* * @author Peter Lin * @version $Revision: 1.5 $ */ public final class DOMPool { /** * The cache is created with an initial size of 50. Running a webservice * test on an old system will likely run into memory or CPU problems long * before the HashMap is an issue. */ protected static HashMap MEMCACHE = new HashMap(50); /** * Return a document. * @param key * @return Document */ public static Document getDocument(Object key) { return (Document) MEMCACHE.get(key); } /** * Add an object to the cache. * @param key * @param data */ public static void putDocument(Object key, Object data) { MEMCACHE.put(key, data); } /** * Private constructor to prevent instantiation. */ private DOMPool() { } }

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