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From Thomas Vandahl <thomas.vand...@tewisoft.de>
Subject Re: closing Datasources at Torque.shutdown()
Date Mon, 27 Jun 2005 07:07:39 GMT
Thomas Fischer wrote:

> Closing works fine for SharedPoolDataSourceFactory and 
> PerUserPoolDataSourceFactory. It does not work, however, for 
> DataSourceFactories deployed/retrieved via JNDI. This has two reasons:
> - First, one does not want to close Pools retrieved via JNDI. Other 
> applications might use the same Datasource. Also, because we have not 
> deployed the Datasource, we are not responsible for shutting it down.
> - Second, even if we have deployed the Datasource, it is very 
> problematic to shut it down because the interface DataSource does not 
> have a close() method or anything similar. As any DataSource can be 
> deployed, we do not know how to shut it down. One might think "See if it 
> is a DBCP Datasource, if yes, we know how to shut it down, let's do it" 
> is also no good solution because it is a very unintuitive behaviour and 
> can lead to very strange errors.

AFAICS, the recommended handling of JNDI DataSources is to leave their 
management to the container. I suggest to implement an empty close() 
method in DataSourceFactory which could be overridden in implementations 
that support closing a DataSource.

Bye, Thomas.


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