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From Matthias Weßendorf (JIRA) <...@myfaces.apache.org>
Subject [jira] Resolved: (TRINIDAD-1247) org.apache.myfaces.trinidadinternal.skin.RequestSkinWrapper.getStyleSheetDocumentId has very poor performance
Date Fri, 03 Oct 2008 17:58:44 GMT

     [ https://issues.apache.org/jira/browse/TRINIDAD-1247?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
]

Matthias Weßendorf resolved TRINIDAD-1247.
------------------------------------------

       Resolution: Fixed
    Fix Version/s: 1.0.10-core
                   1.2.10-core
         Assignee: Matthias Weßendorf

> org.apache.myfaces.trinidadinternal.skin.RequestSkinWrapper.getStyleSheetDocumentId has
very poor performance
> -------------------------------------------------------------------------------------------------------------
>
>                 Key: TRINIDAD-1247
>                 URL: https://issues.apache.org/jira/browse/TRINIDAD-1247
>             Project: MyFaces Trinidad
>          Issue Type: Bug
>            Reporter: Stevan Malesevic
>            Assignee: Matthias Weßendorf
>             Fix For: 1.2.10-core, 1.0.10-core
>
>         Attachments: patch.patch
>
>
> Application we use makes a calls to org.apache.myfaces.trinidadinternal.skin.RequestSkinWrapper.getStyleSheetDocumentId
for each instance of particular component. So there is a couple of calls per request.
> While looking at CPU and memory usage we noticed that a significant amount is spent in
this call. In terms of memory for 45 invocations of this method 5802KB of memory is allocated
, which means about 129K per method invocation
> Most of this memory is spent creating Version objects in org.apache.myfaces.trinidadinternal.style.xml.parse.StyleSheetNode.compareVariants.

> To fix this issue we should change StyleSheetNode._compareBrowserAndVersion method to
have signature like
> private int _compareBrowserAndVersion(int browser, TrinidadAgent agent)
> and create Version object inside the method just before it is needed.   This will greatly
reduce the number of Version objects. 
> The method looks like this:
>   private int _compareBrowserAndVersion(int browser, TrinidadAgent agent)
>   {
>     // If we don't have a browser specified, we match anything
>     if (_agentVersions.isEmpty())
>       return _BROWSER_UNKNOWN_MATCH;
>     // On the other hand, if we do have a browser specified, but
>     // the client browser is not known, we don't have a match
>     if (browser == TrinidadAgent.APPLICATION_UNKNOWN)
>       return 0;
>     
>     //If we have browser exact match, compare versions
>     Integer browserNum = Integer.valueOf(browser);
>     if (_agentVersions.containsKey(browserNum))
>     {
>       Set<Version> versions = _agentVersions.get(browserNum);
>       if (versions.isEmpty())
>         return _BROWSER_EXACT_MATCH | _VERSION_UNKNOWN_MATCH;
>       
>       Version version = new Version(agent.getAgentVersion());
>         
>       for (Version av : versions)
>       {
>         if (av.compareTo(version) == 0)
>         {
>           return _BROWSER_EXACT_MATCH | _VERSION_EXACT_MATCH;
>         }
>       }
>       
>       return 0;
>     }
>     return 0;
>   }
> In my test case memory went down to 214K

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