Lov Webservice called multiple times instead of once

Question

Hi,
I am having a LOV which is being populated by a webservice call.
I have attached this LOV to a view object attribute.
Binded this attribute to a UI(Combo list of values) and when I pick the value from LOV, it fires a
webservice call and fetches data.
When I select a particular value from the list of values, it again fires the webservice call twice.
Can some one advice me on how I can avoid the second and third calls to the webservice being made.
I want the call to be made only once.
Also is there any method in the VOImpl which can help me change this behavior when overriden.
Thanks,
Malathy.

Answer 1

One possible solution is store the LOV values in some scope while retrieving it first time from the web service.
Next time whenever LOV is called then return the LOV values from the scope instead of calling the web service.
psedo code:
        if (ADFContext.getCurrent() != null &&
            ADFContext.getCurrent().getSessionScope().containsKey("LOV_LIST")) {
            LOVList =
                    (List<SelectItem>)ADFContext.getCurrent().getSessionScope().get("LOV_LIST");
        } else {
            LOVList = this.populateVendorListFromWS();
            ADFContext.getCurrent().getSessionScope().put("LOV_LIST",
                                                          LOVList );
        }Hope it helps.