How to send event to another page?

[krokodylowy]

Hi

How to send javax.portlet.event to different page?

Two typical solution, like below, can change page but events are consumed on current page

PortalRequestContext prContext = Util.getPortalRequestContext();

prContext.setResponseComplete(true);

prContext.getResponse().sendRedirect(prContext.getPortalURI() + destinationPage);

response.setEvent(event.getActionName(), event);

another one

        UIPortal uiPortal = Util.getUIPortal();

        PageNodeEvent<UIPortal> pnevent;

        pnevent = new PageNodeEvent<UIPortal>(uiPortal, PageNodeEvent.CHANGE_PAGE_NODE, prContext.getPortalURI()

            + destinationPage);

        UIPageActionListener.ChangePageNodeActionListener cpn = new UIPageActionListener.ChangePageNodeActionListener();

        cpn.execute(pnevent);

response.setEvent(event.getActionName(), event);

What should I do with event's?

[rraposa]

What should you do with events? Use them between portlets on the same page! That is how they are meant to work.

What is your use-case? I suspect you can accomplish whatever you're trying to do using a different technique. If your event payload is a String, then a public render parameter might work fine on the page you are redirecting to. Otherwise, you can store the event payload in the APPLICATION_SCOPE of the portlet session and share it amongst portlets on the new page that way.

[krokodylowy]

Thanks for response.

Our portlet use standard events. Sometimes one portlet must send event to another page.

Another portals got some extension's which can be used for this case

- Liferay and Sun portlet-ext.properties:

     portlet.container.impl=sun in portal-ext.properties.

     portlet.event.distribution=ALL_PORTLETS

     portlet.public.render.parameter.distribution=ALL_PORTLETS

     portlet.event.max.generation=3

- Pluto got org/apache/pluto/driver/services/container/EventProviderImpl.java

Workaround should simulate IBM Websphere "cross-page-wire" like a "The IBM documentation says about exporting cross-page-wire: cross-page-wire: represents a property broker wiring between two portlet instances on either the same page or on different pages. A wire connects a source and a target portlet instance so that values which change in the source are propagated to the target"

Pluto got a simply solution. It expose PortalCallbackService.getEventProvider and I can simply add an event

to queue for next page.

I don't see any similar code in GateIn portal and portlet container (gatein/components/pc) sources.

[rraposa]

Hi Krashan,

I see that now - I didn't realize other portals provided an implementation extension for event communication between pages. That capability is not a part of the JSR286 spec.

I do not believe GateIn has this capability.

Rich

[krokodylowy]

The best approach should be a some kind of injection after 'cpn.execute' directly to ProcessEventsActionListener but some test do not get a working solution (but portal page is changed)

        UIPortal uiPortal = Util.getUIPortal();

        PageNodeEvent<UIPortal> pnevent;

        pnevent = new PageNodeEvent<UIPortal>(uiPortal, PageNodeEvent.CHANGE_PAGE_NODE, prContext.getPortalURI()

            + destinationPage);

        UIPageActionListener.ChangePageNodeActionListener cpn = new UIPageActionListener.ChangePageNodeActionListener();

        cpn.execute(pnevent);

...

[krokodylowy]

Partial solution

- works good with jsp portlets

- page is changed and rendered but requestContext keep's old url (so if needed it can changed only with adding context.redirect(..newPage)

at the end

- sometimes not work's correctly wih jsf portlet's, page switch break jsf lifecycle so portlet on old page throws NPE (new jsp portlet on

new page is displayed correctly)

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PortalRequestContext portalContext = (PortalRequestContext) WebuiRequestContext.getCurrentInstance();

  // change page

  UIPortal uiPortal = Util.getUIPortal();

  PageNodeEvent<UIPortal> pnevent = new PageNodeEvent<UIPortal>(uiPortal, PageNodeEvent.CHANGE_PAGE_NODE,  destinationPage);

  UIPageActionListener.ChangePageNodeActionListener cpn = new UIPageActionListener.ChangePageNodeActionListener();

  cpn.execute(pnevent);

  // push event to new page and portlet

  WebuiRequestContext context = Util.getPortalRequestContext();

  UIPortalApplication currentPortal = Util.getUIPortalApplication();

  UIPortal currentSite = currentPortal.getShowedUIPortal();

  PageNode foundPage = ExoPortalUtils.findPageInNavigations(currentPortal.getNavigations(), destinationPage);

  if (foundPage == null) {

    // page not found force standard redirect

    portalContext.setResponseComplete(true);

    portalContext.getResponse().sendRedirect(portalContext.getPortalURI()+ destinationPage);

    return;

  }

  // locate ui page

  UIPage foundUIPage = Util.toUIPage(foundPage, currentSite);

  // locate ui portlet if defined by name

  UIPortlet foundUIPortlet = null;

  if (portlet != null && portlet.length() > 0)

    foundUIPortlet = ExoPortalUtils.findPortletByName(foundUIPage,portlet);

  // read current events

  EventsWrapper eventsWrapper = (EventsWrapper)portalContext.getAttribute(UIPortletActionListener.PORTLET_EVENTS);

  List<javax.portlet.Event> events = eventsWrapper != null ?eventsWrapper.getEvents() : null;

  if (events == null)

    events = new ArrayList<javax.portlet.Event>();

  // register event for page or portlet

  javax.portlet.Event portletEvent = new PortletEvent(  new QName(XMLConstants.NULL_NS_URI, event.getActionName()), event);

  events.add(portletEvent);

  portalContext.setAttribute(UIPortletActionListener.PORTLET_EVENTS,new EventsWrapper(events));

  // send event to page or portlet, correct flow may be seen and logged in classes UIPortletActionListener,

  // PortletApplication, StateAwareResponseImpl i ProcessEventsActionListener u

  if (foundUIPortlet != null) {

    foundUIPortlet.createEvent("ProcessEvents",org.exoplatform.webui.event.Event.Phase.PROCESS, portalContext)

    .broadcast();

  } else {

    foundUIPage.createEvent("ProcessEvents",org.exoplatform.webui.event.Event.Phase.PROCESS, portalContext)

    .broadcast();

  }

// send redirect if requestContext must keep page track

// portalContext.getResponse().sendRedirect(portalContext.getPortalURI()+ destinationPage);

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