ServiceLocator and environment references. 2003-11-14 - By Sean Brydon
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Hi,
You could take a look at a service locator example at J2EE BluePrints at
http://java.sun.com/blueprints/code/jps131/src/com/sun/j2ee/blueprints
/servicelocator/web/ServiceLocator.java.html
in which we use the caching mechanism for resources like EJB Homes etc
but dont cache the env entries.
hope that helps,
Sean
James Telfer wrote:
>Hello all,
>
>I am quite new to J2EE and have been using the ServiceLocator pattern based
>on the example code provided in the 2nd Edition. While I am aware that
>example code is just that, I would like to know if my problem is a bug in
>the example or a gap in my understanding.
>
>My question is whether JNDI references in the "java:comp/env" context should
>be cached.
>
>As I understand it the env context is specific to each bean, allowing
>implementors to introduce a layer of abstraction between their hard-coded
>JNDI references and the deployment environment. If this is the case, my
>implementation should exclude local environment references.
>
>This would not be an issue if the Singleton pattern was not used, of course,
>but neither would the caching be as effective. That said, if extensive use
>of the *-ref deployment descriptor elements is made, caching would be of
>very little value.
>
>Thanks for your help,
>James Telfer
>
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