Felix Meschberger created FELIX-4692:
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Summary: 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
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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