Re: [Xen-API] Xen Management API draft

["Mike D. Day" <ncmike@xxxxxxxxxx>]

Ewan Mellor wrote:

> Here's a thought -- how about we provide a call with the semantics of "please
> give me the next event", which blocks at the server until an event becomes
> available.  The client would call the server with registration for events, and
> then make this synchronous call in another thread or in a select() loop, which
> would block until an event arrives.  If the connection gets broken without an
> event, just reconnect and block again.
Yes, this would work. The advantage of a blocking poll is simplicity. 
And we could use this method for all asynchronous methods.
I still believe we need an asynchronous notification. The blocking poll 
is pretty heavy. If you imagine a management application that is 
monitoring one hundred machines, it would need to have 100 sessions 
blocked on the event method.
Mike

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