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From Sylvain Wallez <>
Subject Re: Use of a connection in an avalon component
Date Thu, 09 Oct 2003 13:10:13 GMT
Olivier Billard wrote:

> Hi all !
> I wonder how to use a DataSourceComponent and its connection in a 
> custom cocoon avalon component, that is ThreadSafe, to use all 
> performance and connection pool used in Cocoon.
> Should I :
>  - get a connection via datasource.getConnection() and close() it for 
> each public method call,
>  - get a connection in the initialize() method from the interface 
> Initializable, close() it on the dispose() method from Disposable 
> interface, and only create a Statement for each public method call ?
>  - implement another avalon interface, like Runnable, to get/relase 
> the Connection ?
> I looked for exemples in the databases block, but the helpers are not 
> Components. 

If your component is ThreadSafe, a single instance of it will exist in 
the whole system. JDBC connections being non thread safe, you *must* get 
and close them at each call. Don't be afraid to call close(): the 
connection you get is a wrapper managed by the DataSourceComponent which 
puts back the real request in the pool for later reuse when close() is 
called on the wrapper.


Sylvain Wallez                                  Anyware Technologies 
{ XML, Java, Cocoon, OpenSource }*{ Training, Consulting, Projects }
Orixo, the opensource XML business alliance  -

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