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titleImplicit Requirements

Requirement 1:  The Listener should be Thread Safe Code

A single instance of the Listener is created during the server startup.

Since a single instance is used to serve all requests thread safe code is a requirement.

We strongly suggest to not to keep any state.

Requirement 2: The Listener should not throw Exceptions

If the listener throw an exception it will make the API call fail.

Requirement 3: The Listener should use IOperation and IOperationResult as indicated below

All API Operations go through every listener so the method signatures should use IOperation and IOperationResult.

Please use instanceof for safe casting.