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From "Alasdair Nottingham (JIRA)" <j...@apache.org>
Subject [jira] Created: (ARIES-338) osgi:service JNDI damping performs like a one legged dog under an anesthetic
Date Tue, 15 Jun 2010 12:47:22 GMT
osgi:service JNDI damping performs like a one legged dog under an anesthetic
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                 Key: ARIES-338
                 URL: https://issues.apache.org/jira/browse/ARIES-338
             Project: Aries
          Issue Type: Bug
          Components: JNDI
    Affects Versions: 0.1
            Reporter: Alasdair Nottingham
            Assignee: Alasdair Nottingham
             Fix For: 0.2


I updated some of my code to use the JNDI implementation of osgi:service which does the service
damping and my application saw a 3x slowdown (i.e. it took 3 second to do something it used
to take 1 seconds).

It appears the problem is that every time a lookup is performed a new java.lang.reflect.Proxy
class is generated and doing this over and over when the same service is looked up is expensive.
Instead of doing this we can generate a proxy once per client BundleContext per service and
cache it between lookups. The cache needs to be managed, so if the client goes away we clear
the cache and if the service goes away we purge it too.

I have written the code and shown that it improves performance so I'm raising this JIRA so
I can integrate the performance fix.



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