[jira] [Created] (TAP5-2207) It should be possible to be notified of session creations and invalidations

["Jochen Kemnade (JIRA)" <ji...@apache.org>]

Jochen Kemnade created TAP5-2207:
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             Summary: It should be possible to be notified of session creations and invalidations
                 Key: TAP5-2207
                 URL: https://issues.apache.org/jira/browse/TAP5-2207
             Project: Tapestry 5
          Issue Type: Improvement
          Components: tapestry-core
    Affects Versions: 5.3, 5.4
            Reporter: Jochen Kemnade
            Priority: Minor


There are cases when it would be very helpful if one could subscribe to the creations and invalidations of sessions.
* Clear parts of a cache when a session is no longer valid
* Show how many users are currently using the application

Something like a `SessionStateHub` could be added, that is triggered when a `SessionImpl` is created or invalidated. Then, there should be methods to register listeners, e.g. `addSessionCreatedListener`,  `addSessionWillBeInvalidatedListener`, `addSessionInvalidatedListener`.



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