[Bug 33766] New: Document the case for multiple non-interactive "pre-approvers"

[bugzilla-daemon at freedesktop.org]

https://bugs.freedesktop.org/show_bug.cgi?id=33766

           Summary: Document the case for multiple non-interactive
                    "pre-approvers"
           Product: Telepathy
           Version: git master
          Platform: All
        OS/Version: All
            Status: NEW
          Severity: enhancement
          Priority: medium
         Component: tp-spec
        AssignedTo: telepathy-bugs at lists.freedesktop.org
        ReportedBy: mikhail.zabaluev at nokia.com
         QAContact: telepathy-bugs at lists.freedesktop.org


In handling channels, there may be a need to reliably confirm certain facts
before the user is alerted by an approver, or the channel is dispatched to the
handler.
As an example, before launching an incoming call alert, the following actions
need to be completed:
* The logger needs to reliably store the incoming call event;
* The resource policy hook needs to reserve resources necessary for the call.

The message flow described in bug #27860 details how one client can "hijack"
the channel, but it does not describe how multiple entities can serve as
mandatory checkpoints.
The observer property DelayApprovers looks like the necessary hinge to
implement this: it's possible for observers to delay return from
ObserveChannels until they have confirmed readiness. If this is deemed to be a
good enough way (the channel dispatcher is supposed to give sensible timeouts
to ObserveChannels?), it should be documented.

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