Rupert Westenthaler created STANBOL-985:
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Summary: EventJobManager reports a ChainException if executions
finish before the main thread starts waiting for completion
Key: STANBOL-985
URL: https://issues.apache.org/jira/browse/STANBOL-985
Project: Stanbol
Issue Type: Bug
Components: Enhancer
Affects Versions: enhancer-0.10.0
Reporter: Rupert Westenthaler
Assignee: Rupert Westenthaler
The EventJobManager executes enhancement chains by calling engines in different
threads. The "main" thread does wait for the completion. A semaphore with a
single permit is used for that.
However the method that waits for the completion has the bug that it does
incorrectly return false (has not completed) when the execution of the chain
has already finished before the method is called.
Users affected by this bug will see a ChainException with a message such as
org.apache.stanbol.enhancer.servicesapi.ChainException: Execution timeout
after {time}sec (timeout:60sec) for ContentItem <{content-item-uri}>
where the {time} will be typically less than 1ms.
To fix this the
EnhancementJobHandler.EnhancementJobObserver#waitForCompletion(..) method needs
to be adapted to return "true" - completed - also in cases where there is a
permit available on the semaphore as this state indicates that the execution
has completed before the waitForCompletion(..) was called.
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