PropertiesChanged signal, take 2

David Zeuthen zeuthen at
Wed May 12 15:22:32 PDT 2010

Hey Lennart,

Actually, thinking about it some more, it adds zero value having a
PropertiesChanged() signal if it is not including the value!

That is, it's not going to help any generic proxy mechanism. Either
the client-side proxy is dumb and does a Get() on every access. And we
won't need a PropertiesChanged() signal at all. And app-access (e.g.
reading the property) is blocking because we need the Get(). Otherwise
the client-side proxy is smart and does Subscribe() + GetAll() +
updates cached value on receiving signals. And the app code can do
non-blocking access. Hence, "true_no_value" actually makes no sense at
all. So I think we should just remove true_no_value from the spec!


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