[jbossseam-issues] [JBoss JIRA] Updated: (JBSEAM-2001) Use fast optimized API for reading annotations in Seam and Seam RHDS Tools

Mikhail Grushinskiy (JIRA) jira-events at lists.jboss.org
Sun Sep 30 21:20:52 EDT 2007


     [ http://jira.jboss.com/jira/browse/JBSEAM-2001?page=all ]

Mikhail Grushinskiy updated JBSEAM-2001:
----------------------------------------

    Fix Version/s: 2.0.1.GA

> Use fast optimized API for reading annotations in Seam and Seam RHDS Tools
> --------------------------------------------------------------------------
>
>                 Key: JBSEAM-2001
>                 URL: http://jira.jboss.com/jira/browse/JBSEAM-2001
>             Project: JBoss Seam
>          Issue Type: Feature Request
>          Components: Core
>            Reporter: Mikhail Grushinskiy
>             Fix For: 2.0.1.GA
>
>
> Use fast optimized API for reading annotations.
> Seam is using calls to isAnnotationPresent() very frequently and it impacts overall performance and throughput
> backport175 from
> http://backport175.codehaus.org/
> provides API for reading annotations faster than JDK5.
> (They claim in http://fisheye.codehaus.org/browse/backport175/backport175/src/main/org/codehaus/backport175/reader/bytecode/AnnotationReader.java
> as much as 5 times faster)
> Quote:
>     // ===========================================================================
>     // Implementation notes:
>     // Parsing and annotation creation is made in two steps
>     //
>     // 1. The bytecode is parsed and the annotation content is put in elements,
>     //    which are stored for later processing
>     //
>     // 2. Upon annotation access the elements are processed and a dynamic proxy
>     //    for the annotation is created and cached.
>     //
>     // This gives much better performance than reflective access of Java 5
>     // annotations (reflective access is around 5 times slower)
>     // ===========================================================================
> Provide optimizations in Seam for faster annotation reading.  Apart from Seam application performance it also can help Seam tools (in RHDS), 
> as well as application startup time.
> This behavior can be made optional similarly to hibernate's hibernate.jdbc.use_refection_optimizer

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