John Ross created ARIES-968:
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Summary: Consider using a "multiple attempts" strategy versus the
current locking strategy when updating sharing policies.
Key: ARIES-968
URL: https://issues.apache.org/jira/browse/ARIES-968
Project: Aries
Issue Type: Improvement
Components: Subsystem
Reporter: John Ross
Assignee: John Ross
The AriesSubsystem.addRequirements(Collection<Requirement>) method adds the
specified requirements to a subsystem's sharing policy, which is controlled by
a Region in the RegionDigraph API. Updating a region digraph is atomic. This
means a copy of the current digraph is made, updated, and then set in the
digraph service. If something else sets a a different copy between the time the
first copy is made and set, an exception occurs. Currently, this is mitigated
by locking on the SubsystemImpl class. A better mitigating approach would be to
make multiple attempts until it either succeeded or some threshold number of
attempts was surpassed. This would avoid the bottleneck as well as address the
possibility of something outside subsystems interfering.
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