[rules-users] Once the engine gets the package from guvnor, how to cache it and make it independent of guvnor.

[Jaroslaw Kijanowski]

Hi,

Wesley Akio Imamura wrote:
> Hi,
> 
> I'm using this drools 5.0 scenario: agent using changeset file pointing 
> to a LATEST package guvnor URL.
> 
> The guvnor docs says how to start the agent resource scanning to make 
> the engine change aware:
> - ResourceFactory.getResourceChangeNotifierService().start();
> - ResourceFactory.getResourceChangeScannerService().start();
>  
> I suppose once the agent gets the packages from guvnor and caches it, it 
> should not need guvnor anymore unless there are changes. The agent could 
> use the cache and guvnor could be offline for a long time. This worked 
> on version 5 M1. You could even restart the engine and it started using 
> the cached version.


This was broken in 5.0.1, but works fine in trunk.


> 
> The problem I have with the latest 5.0 with new Knowledge classes ang 
> changeset.xml: when guvnor is offline, the resource scanning detects 
> this and unsubscribes the package, leaving the engine without any 
> knowledge. When guvnor is up again, the resource scanning cannot detect 
> it, and the engine remains without any knowledge.
> 
> How do I tell the agent to not unsubscribe url's that are offline, not 
> to remove their knowledge and just use the cache ?
> Can I still configure the cache directory ?


Yes, just use the "drools.resource.urlcache" system property.

Cheers,
  Jarek


> Maybe the problem I have is that I'm using the LATEST packages and not 
> snapshots ?
> 
> The point here is to make the engine totally independent of Guvnor when 
> it got a package once.
> 
> Hope anyone can help me. Maybe I'll try version 5.1 to see what happens 
> then guvnor is down.
> 
> Thanks,
> Wesley.
> 
> [2009:10:292 12:10:296:debug] ResourceChangeScanner attempt to scan 0 
> resources
> 
> -- 
> Wesley Akio Imamura
> São Paulo - SP - Brazil
> 
> 
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