How to define custom event and how to trigger the defined event

Question

hi,guys
hurry issue....................hope get help.
I am using oracle weblogic 10gr3 portal.and we choiced java portlet.as of now,we got some question about custom Event.hope you can give some idea....
thank you so much.
question detail:
1.for java portlet ,how to define custom event.
2.how to trigger this event.
3 about the data,may be sometime need to transit Biz data.
auctully,I just want to implements between two portlets communicate.
for example:
existing portletA,portletB.
portletA is a list,like:
A AA <button>
after I click this buttom,then portletB will be effect,it means they are interact with each other.
does anybody hit this issue before,if you solved pls share me .
thank you for you help....

Answer 1

Hello,
Please note that everything below applies to JSR168 portlets ONLY- JSR286 portlets and other portlet types handle events a little differently.
From inside your JSR168 portlet you can send an event during processAction or when receiving another event by using the PortletBackingContext object, such as:
import javax.portlet.ActionResponse;
import javax.portlet.ActionRequest;
import javax.servlet.http.HttpServletRequest;
import com.bea.netuix.servlets.controls.portlet.backing.PortletBackingContext;
public void processAction(ActionRequest actionRequest, ActionResponse actionResponse)
HttpServletRequest httpRequest = (HttpServletRequest) actionRequest.getAttribute("javax.servlet.request");
PortletBackingContext portletBackingContext = PortletBackingContext.getPortletBackingContext(httpRequest);
portletBackingContext.fireCustomEvent("customEvent", "This is a custom event");
To receive an event, in your .portlet file you just need to put in a "handleCustomEvent" tag specifying which method to call when the event is received, such as:
<?xml version="1.0" encoding="UTF-8"?>
<portal:root xmlns:netuix="http://www.bea.com/servers/netuix/xsd/controls/netuix/1.0.0"
xmlns:portal="http://www.bea.com/servers/netuix/xsd/portal/support/1.0.0"
xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
xsi:schemaLocation="http://www.bea.com/servers/netuix/xsd/portal/support/1.0.0 portal-support-1_0_0.xsd">
<netuix:javaPortlet title="Listening Portlet" definitionLabel="yourPortletName">
<netuix:handleCustomEvent event="customEvent" eventLabel="customEvent" filterable="true" description="custom event handler">
<netuix:invokeJavaPortletMethod method="processCustomEvent"/>
</netuix:handleCustomEvent>
</netuix:javaPortlet>
</portal:root>
Then, in your receiving portlet the method "processCustomEvent" would receive the event, such as:
public void processCustomEvent(ActionRequest actionRequest, ActionResponse actionResponse, Event event)
The event payload can be any Serializable object you want, but for forward-compatibility with JSR286 it would be ideal if it had a valid JAXB binding.
Kevin