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List:       xmlbeans-dev
Subject:    [jira] Assigned: (XMLBEANS-271) Path leaks objects in by caching
From:       "Wing Yew Poon (JIRA)" <xmlbeans-dev () xml ! apache ! org>
Date:       2009-10-26 19:18:59
Message-ID: 630802301.1256584739579.JavaMail.jira () brutus
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     [ https://issues.apache.org/jira/browse/XMLBEANS-271?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel \
]

Wing Yew Poon reassigned XMLBEANS-271:
--------------------------------------

    Assignee: Wing Yew Poon

> Path leaks objects in by caching paths and queries
> --------------------------------------------------
> 
> Key: XMLBEANS-271
> URL: https://issues.apache.org/jira/browse/XMLBEANS-271
> Project: XMLBeans
> Issue Type: Bug
> Components: XPath
> Affects Versions: Version 1.0.3
> Environment: WinXP, jdk 1.4.2_05
> Reporter: Scott L'Hommedieu
> Assignee: Wing Yew Poon
> 
> In org.apache.xmlbeans.impl.store.Path
> Several HashMaps are used to cache paths and queries:
> private static Map _xqrlPathCache = new HashMap();
> private static Map _xbeanPathCache = new HashMap();
> private static Map _xqrlQueryCache = new HashMap();
> These caches are then used to store paths and queries as the queries are performed.
> This cache is not managed so as the number of unique queries grows so does the \
> cache. Because the cache is not internally managed by xmlbeans the user should be \
> allowed to set some limit to the cache size to prevent an over utilization of \
> memory. Below is a snippet of code to illustrate my idea of a sized cache.
> private static HashMap _xqrlPathCache = new CacheMap();
> private static HashMap _xbeanPathCache = new CacheMap();
> private static HashMap _xqrlQueryCache = new CacheMap();
> 
> private static class CacheMap extends LinkedHashMap
> {
> private static final String XPATH_CACHE_SIZE = "xpathCacheSize";
> private static int MAX_ENTRIES = -1;
> static{
> String size = null;
> if((size = System.getProperty(XPATH_CACHE_SIZE)) != null){
> try{
> MAX_ENTRIES = Integer.parseInt(size);
> }catch(Exception e)
> {   //There's no other logging in here otherwise I would spit out a message
> }
> }
> }

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