OTS 1.1 MAILINGLIST Avatar
  1. OMG Issue

OTS11 — ChildBegin on a subordinate node

  • Key: OTS11-5
  • Legacy Issue Number: 4711
  • Status: closed  
  • Source: International Business Machines ( Ian Robinson)
  • Summary:

    The final adopted specification of the Activity Service specification
    states, in section 2.2.1:
    "If the parent of a sub-Activity is not a root Activity (i.e., it is an
    interposed subordinate)
    then the distribution of the ChildLifetime signals is delegated upstream to
    the superior
    ActivityCoordinator."

    Since no service context would flow on a delegated process_signal_set
    request to an
    upstream ActivityCoordinator, then any Action registered in the upstream
    node with an
    interest in the ChildLifetime SignalSet would not be able to determine the
    identity
    of the child activity begun.

    Any solution to this problem needs to interoperable rather than dependent
    on implementation
    since the upstream ActivityCoordinator could be part of a foreign domain.

    2 potential solutions are:
    1. New methods on the ActivityCoordinator and and SignalSet interfaces:
    ActivityCoordinator::process_signal_set_with_data(in string ssName,
    in CompletionStatus cs, in any signalData);
    and
    SignalSet::get_signal_with_data(inout boolean lastSignal, in any signalData);

    The subordinate Coordinator-Action could build the ActivityInformation any
    required by the ChildLifetime SignalSet and pass this in the signalData on
    the upstream process_signal_set_with_data.
    2. Change the specification to state that ChildLifetime signals are distributed
    from the node in which the child Activity begins. In the case where there are
    Actions registered with the parent in an upstream node on which the child does
    not execute, then these Actions are not informed of the event.

    (2) is simpler but compromises the ideal of location transparency.

  • Reported: OTS 1.0 — Fri, 23 Nov 2001 05:00 GMT
  • Disposition: Resolved — OTS 1.1
  • Disposition Summary:

    see above

  • Updated: Fri, 6 Mar 2015 20:57 GMT