[Interest] Q_PROPERTY notification across processes?

Constantin Makshin cmakshin at gmail.com
Fri May 17 04:46:21 CEST 2013

If these processes will be on different systems, then I doubt that you have
any choice. :-)
On May 17, 2013 5:27 AM, "Charley Bay" <charleyb123 at gmail.com> wrote:

> I have a C++ QObject-derived class that exposes properties for use in QML,
> works fine (Qt5).
> I would like to instantiate an "instance" of this class in each of two
> processes, where changes in one "notifies" the other (in the other
> process).  This is logically something like "local-instance-reflection" to
> a remote instance in a remote process.
> (I could create a second class-type if needed, but current implementation
> suggests I could instantiate the same class type on each side.)
> My current thoughts are to use a "socket" between the two processes, where
> the objects "agree" on a unique identifier that represents that
> "reflected-instance" in each process.  Then, the implementation would
> trigger "onChange" operations in the remote-instance from property-changes
> in the local-instance.  There would be many of these "reflecting-pairs".
> This "implementation-plumbing" would probably be through some C++
> implemented dispatcher, where one would be instantiated in each process,
> and be responsible for the serialization for state-changes/notifications
> between the processes (read/write), and routing the notification to the
> object in the local process.
> A concern I have is that there will be *many* of these pairs (thousands,
> possibly tens-of-thousands), and I don't know if the approach would
> scale-well for lots of notifications.
> Does this design seem reasonable?
> Do you have thoughts on an alternative?
> It seems like the "Q_PROPERTY" notification through QML would be an
> interesting mechanism to enable this "generic-cross-process"
> event-based-synchronization.
> I can't use shared memory, as these processes will typically be on
> different machines.
> --charley
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