Re: [geowebcache-users] Is their a way to make GeoWebCache send the data back asynchronously instead of synchronously?

[Arne K. <ak...@op...>]

Hi,

I don't think I follow, the only real synchronization in GWC is  
metatiling (only one thread triggers the metatile fetch, the remaining 
ones block). This is done per layer, so no interaction between seeded 
and unseeded layers. There is some hashing / reuse of locks, but you 
should see that 17 metatiles can be fetched simultaneously per layer.

Is this a JavaScript client? If so, see the previous email on this list. 
Browsers will only open two simultaneous connections to the same 
hostname, if those are slow to respond then the client will not move on 
until they have been rendered. But you can alleviate that by using 
different hostnames for the same machine in the definition of the other 
layer.

-Arne

John Mitchell wrote:
> Hi,
>
> It appears that the client -> geowebcache -> back to the client runs 
> synchronously. In other words the first layer requested is always the 
> first layer returned back to the client.
>   *
> *If the layers do not go through GeoWebCache then they are not 
> processed synchronously instead all layers are processed 
> asynchronously so which every layer completes its rendering will come 
> back first even if it is not the first layer requested.
>
> I have tested this on an area where the first layer requested via 
> GeoWebCache has not been seeded but the second layer requested via 
> GeoWebcache has been seeded even though the the second layer can send 
> the data back to the client GeoWebCache does not send it back until 
> after the first layer has finished rendering on the back end and then 
> sent back to the client.
>
> Is their a way to make GeoWebCache send the data back asynchronously 
> instead of synchronously?
>
> Thanks,
>
> John*
> *
> -- 
> John J. Mitchell
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-- 
Arne Kepp
OpenGeo - http://opengeo.org
Expert service straight from the developers