Question about caching of properties

[fmartinsons]

Hello,

I have a zbus proxy built with dbus_proxy macro and I use the same proxy instance accross my program to read some properties of a remote service.
I came accross something that puzzled me: if the remote service is stopped after the proxy creation, reading properties still succeed with the last known value. I though I'd receive an error of kind "The name x.y.z was not provided by any .service files" .
Moreover, after the remote service went up again, the property value is still the "old" one (last one read when the proxy was created)
If I use ProxyBuilder and disable caching of properties, the behavior is what I expected (error on property read and refresh when remote service went up again).

Is it "normal" that the cache is not invalidated if remote service went down or did I do something wrong ?
By the way I used zbus 3.15.2 , if the last zbus version changes this behavior , please tell me.

Thanks

[zeenix]

Is it "normal" that the cache is not invalidated if remote service went down or did I do something wrong ?

Yes. The service being down doesn't really mean that you shouldn't be able to get the last known value of a property. I can see why this could be confusing but OTOH I'm not sure if this is something people would want: an error instead of the last known value of the property. We've a an API for folks to keep a track of the service.

[fmartinsons]

Thank you for your answer,

I can understand the choice of returning the last known cached value when a remote service is down but it is more troubling when the service is alive and the property read is not in line with the "real" value.
So to be sure to have real value , one must disable the property cache or use the API you pointed to keep track of remote service status.
In the later and in case of property cache enabled, what can be done to if we are notify about a service restart (done then up again) ? Are we force to recreate the proxy ?