datasource and singleton

[greiff]

simple question:

to avoid expensive JNDI lookups to datasource is it possible to use the singleton pattern for datasources ?

Torsten

[adrian.brock]

Yes, the DataSource is a factory. Singleton caching works with any factory that has
been coded correctly (i.e. it is thread safe).

In fact, the JBossCMP engine does this.

[greiff]

thanks for your quick reply adrion
it's a helpful information

Torsten

[henk53]

"greiff" wrote:

to avoid expensive JNDI lookups to datasource is it possible to use the singleton pattern for datasources ?

Just wondering, are JNDI lookups really that expensive? When looking up an EJB (either programmatic, or via injection), isn't there a JNDI lookup happening all the time?

[henk53]

Anyone?

[vickyk]

"henk53" wrote:

Just wondering, are JNDI lookups really that expensive? When looking up an EJB (either programmatic, or via injection), isn't there a JNDI lookup happening all the time?

Yes, but you need to understand that there is a trade-off between the efficiency and flexibility(loosely coupling).
You should be talking at EJB forums for the EJB details, you can get more help there.