John Ross created ARIES-1388:
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Summary: Compute requirement filters only once.
Key: ARIES-1388
URL: https://issues.apache.org/jira/browse/ARIES-1388
Project: Aries
Issue Type: Improvement
Components: Subsystem
Affects Versions: subsystem-2.0.2
Reporter: John Ross
Assignee: John Ross
ResourceHelper.matches(Requirement, Capability) is an often used method during
resolution. Currently, it recomputes the requirement filter with each call.
The measurements used the same test scenario being developed as part of
ARIES-1357. The time it took to install 50 features was measured. Each feature
consists of 10 bundles plus one application. All features share the same 10
bundles. Each bundle exports 5 unique packages. Each application consists of 10
unique bundles. The bundles import packages offered by the containing feature.
The baseline average time for installing all 50 features was 67.9 seconds.
AbstractRequirement will now lazily compute the requirement filter when asked
for the first time. Subsequent calls will return the already computed value.
ResourceHelper now asks whether or not the Requirement is an instance of
AbstractRequirement. If so, it asks for the filter directly. If not, the filter
is computed as before.
After these modifications, the average time for installing all 50 features was
46.6 seconds, a 31.3% improvement.
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