[asterisk-bugs] [JIRA] (ASTERISK-20880) Add channel caching to event subsystem

[Matt Jordan (JIRA)]

     [ https://issues.asterisk.org/jira/browse/ASTERISK-20880?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]

Matt Jordan updated ASTERISK-20880:
-----------------------------------

    Status: Open  (was: Triage)
    
> Add channel caching to event subsystem
> --------------------------------------
>
>                 Key: ASTERISK-20880
>                 URL: https://issues.asterisk.org/jira/browse/ASTERISK-20880
>             Project: Asterisk
>          Issue Type: New Feature
>          Components: Core/Stasis
>            Reporter: Matt Jordan
>              Labels: Asterisk12
>
> Elements built on top of Stasis-Core will need to subscribe for changes in the channel state and be able to query for a channel's current state. While Stasis-Core may eventually be a separate module/subsystem, for now it makes sense to build the functionality on top of the existing event pub/sub system.
> There are a couple of 'requirements' that a solution should meet:
> # {{ast_channel}} objects should not be passed directly. Events being raised should not affect the lifetime of the channel object and should not provide direct access to the {{ast_channel}} object, but should instead pass a copy of the necessary information. This helps keep event consumers thread-safe.
> # The channel information passed by the event subsystem does not have to be all information contained in a channel, but should carry the name, unique ID, state, and other information likely to change on a channel.
> # Alternatively, a key/value pair mechanism containing the updated parameters of the channel can be passed (using either {{ast_variable}} or typed tuples, as prototyped on https://reviewboard.asterisk.org/r/2248/
> As an initial candidate of consuming this information, AMI should be refactored to subscribe for channel state updates and send the event based on this information. The existing {{Newstate}} event should be refactored into manager.c and built on top of this information.

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