perf: cache clientMetadata lambda to avoid per-call allocation#1952
perf: cache clientMetadata lambda to avoid per-call allocation#1952tobias-ibounig-dt wants to merge 1 commit into
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This pull request refactors OpenFeatureClient to store a clientMetadata field initialized with a lambda reference in the constructor, returning it in getMetadata(). The reviewer suggests optimizing this further by having OpenFeatureClient directly implement the ClientMetadata interface, which would allow getMetadata() to return this and completely eliminate the extra field and lambda allocation.
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| @Override | ||
| public ClientMetadata getMetadata() { | ||
| return this::getDomain; | ||
| return clientMetadata; |
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Instead of introducing a new clientMetadata field and allocating a lambda instance in the constructor, OpenFeatureClient can directly implement the ClientMetadata interface.
Since OpenFeatureClient already has a public getDomain() method (generated by Lombok's @Getter on the domain field), it already satisfies the ClientMetadata interface requirements.
To apply this optimization:
- Update the class signature to:
public class OpenFeatureClient implements Client, ClientMetadata {
- Remove the
clientMetadatafield and its initialization in the constructor. - Update
getMetadata()to returnthisas suggested below.
This completely avoids any extra field overhead and lambda allocation (reducing it to zero allocation).
| return clientMetadata; | |
| return this; |
Signed-off-by: Tobias Ibounig <tobias.ibounig@dynatrace.com>
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ClientMetadatalambda in a final field to avoid re-allocating it on everygetMetadata()callRelated Issues
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Notes
getMetadata()is called once per flag evaluation to build theSharedHookContext. Previously it returnedthis::getDomain— a new lambda instance each time. The field is initialized once in the constructor.Allocation impact is negligible, but reduces on
totalAllocatedInstancescan be seen.main(baseline)run:+totalAllocatedBytesrun:+totalAllocatedInstancesFollow-up Tasks