Sharing a connection pool among contexts

[Scott <mi...@linkline.com>]

Hi, I have configured the commons-dbcp datasource as a JNDI resource for 
MSSQL and Oracle and all is working as expected. However, as I understand, 
it is only possible to keep a factory as a resource and so a new datapool 
must be created everytime a JNDI lookup is done. I would like to share a 
single connection pool among different contexts.

My first attempt was to create a listener that put a single instance of a 
pool into the JNDI only to find that it is read-only. For my next attempt I 
am thinking of creating a javabean with a static collection of datasources 
and name keys that can be gotten as a JNDI resource so that the different 
applications can just retrieve the bean and do a lookup of the datasource 
that way.

Am I missing an easier or better way to do this? I do not have any 
experience with Javabeans and based on the stuff I've seen on the web beans 
are usually graphic oriented. Is this an appropriate use of a bean (or 
perhaps an Enterprise Javabean)?

Thank you in advance,
Scott



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Re: Sharing a connection pool among contexts

[Emerson Cargnin <em...@tre-sc.gov.br>]

I do it in a different way :

I have a servlet in charge to set all pools, and I have a class with  
statics methods to manage the pools, creating, test, and show their use.
This class is shared with all contexts through a jar in common/lib.

So I have a servlet, with all configuration of the pools in param in the 
web.xml. this servlet can create pools (in its init method), test and 
show it, and show statistics.
I works great, and I can share a pool among contexts.
I use the bitmechanic connection pool, a little old, but still works. 
http://www.bitmechanic.com/projects/jdbcpool/dist/jdbcpool-1.0b1.zip    
          
I put the jar of the pool in the common/lib dir. I f anyone is 
interested in the ConnectionManager, I can share it, it's an eclipse 
project with ant build file that generates both war and the lib jar.

Hope it can help :)

Emerson

Scott wrote:

> Hi, I have configured the commons-dbcp datasource as a JNDI resource 
> for MSSQL and Oracle and all is working as expected. However, as I 
> understand, it is only possible to keep a factory as a resource and so 
> a new datapool must be created everytime a JNDI lookup is done. I 
> would like to share a single connection pool among different contexts.
>
> My first attempt was to create a listener that put a single instance 
> of a pool into the JNDI only to find that it is read-only. For my next 
> attempt I am thinking of creating a javabean with a static collection 
> of datasources and name keys that can be gotten as a JNDI resource so 
> that the different applications can just retrieve the bean and do a 
> lookup of the datasource that way.
>
> Am I missing an easier or better way to do this? I do not have any 
> experience with Javabeans and based on the stuff I've seen on the web 
> beans are usually graphic oriented. Is this an appropriate use of a 
> bean (or perhaps an Enterprise Javabean)?
>
> Thank you in advance,
> Scott
>
>
>
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> To unsubscribe, e-mail: tomcat-user-unsubscribe@jakarta.apache.org
> For additional commands, e-mail: tomcat-user-help@jakarta.apache.org
>
>

-- 
Emerson Cargnin
Analista de Sitemas
Setor de Desenvolvimento de Sistemas - TRE-SC
tel : (048) - 251-3700 - Ramal 3181




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