Why two different serviceLocators in petstore demo 1.3 ?? 2003-10-05 - By peng wang
Back
Hi,
In petstore, I find there are two kinds of service
locators, one is for the web tier, the other for the
ejb tier.
In web tier a componentManager gets locator instance
by invoking static method:
static public ServiceLocator getInstance() {
return me;
}
Since there is only one instance, does it then form a
bottle neck in web tier?
In ejb tier, an ejbAction get locator by creating a
new
instance like:
ServiceLocator sl = new ServiceLocator();
So I think there are multi serviceLocator instances in
the ejb tier(differing from web tier).
What is the force for two kinds of serviceLocators in
petstore application? When need to use the first, and
when the second??
Thanks!
__ ____ ____ ____ ____ ____ ______
Do you Yahoo!?
The New Yahoo! Shopping - with improved product search
http://shopping.yahoo.com
====================================================================
Companion Site: http://www.corej2eepatterns.com
J2EE BluePrints: http://java.sun.com/blueprints/corej2eepatterns
List Archive: http://archives.java.sun.com/archives/j2eepatterns-interest.html
Unsubscribing: email "signoff J2EEPATTERNS-INTEREST" to listserv@(protected)
|
|
