[XESAM] changes in the Xesam XML Query Languae

[jamie]

On Mon, 2007-05-21 at 21:43 +0200, Mikkel Kamstrup Erlandsen wrote:

> 
> 
>         >
>         > 5) And a bigger issue, that is a tough call... Should we use
>         real dbus
>         > objects for sessions/searches? According to Havoc Pennington
>         it
>         > doesn't take a roundtrip to the bus to register a new
>         object, so 
>         > spawning lots of search objects shouldn't flood the bus (not
>         with
>         > object-registration requests at least).
>         
>         yes the overhead is negligible - its not like an app is going
>         to
>         construct 100's of search objects all at once
> 
> I just had seconds thoughts on this. One thing is that the spawning of
> the Search object on the server doesn't touch the bus, but what about
> when the client sets up a proxy to it?
> 
> The current way where only handles are used is guaranteed to not have
> extra dbus roundtrips and I really think this is an important
> feature. 
>  

well we can - we only need a unique Id for the session so its one round
trip max. For each new query we can append queryX where X is an
incrementing integer to the session object path so no round trip is
needed


> Maybe we wont handle 100's of searches, but I could easily imagine
> myself doing 50 searches/sec or whatever the engine could pull off.
> This could fx be in a scenario where I would like to extract
> meta-information about the index. Such as information clusters. 

can easily reuse existing search query objects for that - no need to
keep creating new ones?


jamie