Thomas Watson created FELIX-6155:
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Summary: Add caching of service component metadata
Key: FELIX-6155
URL: https://issues.apache.org/jira/browse/FELIX-6155
Project: Felix
Issue Type: Improvement
Components: Declarative Services (SCR)
Affects Versions: scr-2.1.16
Reporter: Thomas Watson
Assignee: Thomas Watson
SCR has to discover and parse the component XML files of all bundles that have
the Service-Component header. In a configuration that has a significant number
of bundles using SCR this overhead begins to add up. For modest number of
bundles (~300) I see this taking nearly 200 ms in an overall application launch
time of 3000 ms.
This overhead can be greatly reduced if we cached the component metadata such
that on restart the XML files do not need to be discovered or parsed, or even
having to look for the Service-Component header in all active bundles. I am
working on a caching implementation that I would like to contribute which I
plan to have disabled by default so we can experiment with enabling such a
cache for cases where a relaunch performance time is critical.
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