Dirk Rudolph created SLING-8946:
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Summary: Non-deterministic shadowing of resource observation
Key: SLING-8946
URL: https://issues.apache.org/jira/browse/SLING-8946
Project: Sling
Issue Type: Bug
Components: ResourceResolver
Affects Versions: Resource Resolver 1.5.34
Reporter: Dirk Rudolph
The BasicObservationReporter implements shadowing of events being propagated
per ResourceProvider instance [1]. Assuming we do have 2 ResourceProviders
registered, where the one shadows the other like this:
- RP A registered on /
- RP B registered on /path
then currently the excludes given to the BasicObservationReporter are different
depending on either RP A or RP B gets registered first:
- RP A before RP B => excludes are empty
- RP B before RP A => excludes contain /path
This is because only the newly registered RP gets its ProviderContext updated
[2]
Same applies if RP B is registered before RP A and gets unregistered. In that
case the ObservationReporter of RP A stays untouched.
[1]
[https://github.com/apache/sling-org-apache-sling-resourceresolver/blob/master/src/main/java/org/apache/sling/resourceresolver/impl/observation/BasicObservationReporter.java#L102]
[2]
[https://github.com/apache/sling-org-apache-sling-resourceresolver/blob/master/src/main/java/org/apache/sling/resourceresolver/impl/providers/ResourceProviderTracker.java#L358]
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