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At the moment, the only general solution seems to be to put the due synchronization on the Adapter side.
Note that when you get onSubscription() on the client side, you are guaranteed that...

Ok.
By the way, I think it's worth reminding that there isn't a 1:1 relationship between the client subscription and the invocation of subscribe() on the Data Adapter, though this may be the case...

I confirm that the onSubscription() event doesn't have the meaning you expected.
I appreciate that what reported in the documentation

may be misleading.
Actually, the outcome of the subscription...