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From Michael Baessler <...@michael-baessler.de>
Subject Re: Sharing a database connection across Analysis Engines
Date Mon, 15 Oct 2007 07:48:29 GMT
Hi Thomas,

it is possible to share resources between analysis engines. You will 
find an example in the UIMA documentation for FileResources that are 

In your case I think you can also look at the UIMA tutorial example 6. 
There an individual external resource called StringMapResource is 
created. I think you can do something similar.

Create a config file with all you database connection information and 
load it using your own resource e.g. DBResource. Within the DBResource 
implementation you can open the connection and return it on request.

I haven't tried that myself, but I think it should work :-)

-- Michael

Thomas Francart wrote:
> Hi all
> I want to share a remote connection to an EJB (it could be to a database)
> across analysis engines.
> 1. If I assume that all my AE are local, is this possible ? how ?
> 2. In the UIMA philosophy, should each AE open its own connection ?
> 3. If I need to open a connection for each AE, how can I share the
> connection properties for this connection in a single file ? in other words,
> how can I access a single properties file (or maybe a resource XML
> description) from every AE ?
> 4. I understood there was a notion of "session" that was intended to share
> data across multiple instances of the same AE. Isn't there a notion of
> session to share data across the different AE in the flow ? (I don't want to
> put connection parameters inside the CAS, it has nothing to do with the
> document analysis)
> Thanks for your help
> Thomas

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