[jira] [Commented] (FELIX-4692) Improve Service access time

["Carsten Ziegeler (JIRA)" <ji...@apache.org>]

    [ https://issues.apache.org/jira/browse/FELIX-4692?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14251685#comment-14251685 ] 

Carsten Ziegeler commented on FELIX-4692:
-----------------------------------------

[~rickhall] Do you think we should apply this patch anyway? It looks at least like a good first step.

> Improve Service access time
> ---------------------------
>
>                 Key: FELIX-4692
>                 URL: https://issues.apache.org/jira/browse/FELIX-4692
>             Project: Felix
>          Issue Type: Improvement
>          Components: Framework
>    Affects Versions: framework-4.4.1
>            Reporter: Felix Meschberger
>            Assignee: Felix Meschberger
>             Fix For: framework-4.6.0
>
>         Attachments: FELIX-4692.diff
>
>
> Currently the ServiceRegistry takes roughly 1ms to access a single service. In a reasonably large system, this may over time consume considerable time.
> For example in our inhouse system sporting roughly 5000 services with 15'000 service accesses during startup, these accesses acount for almost 15 seconds or roughly 25-30% of the total startup time.
> Internally all accesses to services are handled with a Filter even if the service is simply retrieved with the service name without a filter. This causes a considerable overhead.
> A simple improvement is to keep services not only in a global Capabitliy Set accessible through generic filters but also keep such a set for each registered service name.
> The measured improvement of this change is substantial: accessing these 15'000 services now only takes roughly 3 seconds or 0.2 ms per service or 5 times faster.



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