Thomas Heigl created WICKET-6773:
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Summary: Improve performance of getting behaviors for components
Key: WICKET-6773
URL: https://issues.apache.org/jira/browse/WICKET-6773
Project: Wicket
Issue Type: Improvement
Components: wicket-core
Affects Versions: 9.0.0-M5, 8.7.0
Reporter: Thomas Heigl
Another method that showed up as hot in our production profiler is
{{Behaviors.getBehaviors()}}.
I wrote a JHM benchmark and identified the problematic part of the method as
{{Collections.unmodifiableList(subset)}}. For components without behaviors *but
with* model or metadata, this method wraps an empty list in an unmodifiable
list. This seems to be extremely slow because it does not optimize for the case
of an empty list.
If we return {{Collections.emptyList()}} in this case, the throughput of the
method nearly doubles:
||Benchmark||Score||Units||
|BehaviorsBenchmarks.getOld|86802535,017|ops/s|
|BehaviorsBenchmarks.getNew|143565516,640|ops/s|
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