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List:       lucene-dev
Subject:    Re: Interfaces
From:       Maik Schreiber <blizzy-keyword-lucene_dev.6564c8 () blizzy ! de>
Date:       2005-03-18 15:22:17
Message-ID: 423AF229.3020509 () blizzy ! de
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> However, the primary focus of 
> Lucene is and always will be performance.  It would be important to 
> demonstrate that resource utilization and performance are not adversely 
> affected by such changes.

I can't see why interfaces should affect performance or resource utilization 
in a tangible way.

For interface calls, the resulting bytecode would use invokeinterface 
instead of invokevirtual calls, but the speed difference is absolutely 
negligible (in the range of 500 nanoseconds per call at most during my tests 
with JDK 1.5.0_02 and JProfiler 3.3).

Resource utilization would take up some bytes for the additional interfaces 
and generated code from the JIT compiler, but that's about it.

-- 
Maik Schreiber   *   http://www.blizzy.de

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