1 2 Previous Next 26 Replies Latest reply on Jun 24, 2009 7:50 AM by Chris Laprun

    Cross Page wiring in JBoss

    dorothy taylor Apprentice

      Hi

      Can anyone please suggest how to implement cross page eventing using JSR 286 portlets in JBoss. My events are working perfectly without the aid of any administrative tool, when they are in the same page. But wen the portlets are placed across pages, then the Co-ordination tool is not displaying any events in the admin console. Please suggest how we can use the tool

        • 1. Re: Cross Page wiring in JBoss
          Thomas Heute Master

          You can't. Usually it would be a bad practice. Why do you need this ?

          • 2. Re: Cross Page wiring in JBoss
            dorothy taylor Apprentice

            Well, IBM WPS 6.1 provides that..infact they have it right from the 5.0 version of WPS. It would have been added for a reason. Is it not required in JBoss i mean may be for the sake of being in the competitive space?

            • 3. Re: Cross Page wiring in JBoss
              Thomas Heute Master

              Please, the fact that any vendor does it doesn't mean anything.

              Providing this gives a false sense of portal portability, which in the end allows for vendor lock-in.

              Events are a powerful but dangerous feature "with great power comes great responsibility". This is why I asked for the usecase as often developers tend to use this mechanism to replace a mechanism like JMS that guarantees delivery (and portlet events don't) or other things for which portlet events aren't designed for.

              • 4. Re: Cross Page wiring in JBoss
                Stéphane Toussaint Newbie

                I encounter the same restriction. My use case is that I'm building an application composed by a few modules (each modules comes as a portlet package in a war).

                I use some page spaces in order to compose different views of my application (base on the role or the application context (summary page, detail page)).

                I can pass from one page to another but I need to instruct the target page (in fact the target portlets) for some params. So I build a sort of session Handler (DB storage) on top of synchronized by the sessionID.

                I don't like that to much (should not work on distributed applications), but I don't know how to do that differently. I regret the lake of a Portal Scope variable.

                • 5. Re: Cross Page wiring in JBoss
                  dorothy taylor Apprentice

                  Yes, cross-page wiring will be required when there are different page views to be provided to user based on certain conditions. Is it not a limitation in JBoss then?

                  • 6. Re: Cross Page wiring in JBoss
                    Stéphane Toussaint Newbie

                    Question of language : It is not a limitation... It is a non addressed feature.

                    But I agree with you, JBP lake of this sort of feature.

                    • 7. Re: Cross Page wiring in JBoss
                      Chris Laprun Master

                      JSR 286 events are meant for UI events. I'd argue that, and this is why we haven't implemented cross-page wiring, wanting to change things across several pages is not in the realm of UI anymore (since you won't be able to see everything at the same time), rather it's a business domain issue where, as Thomas pointed out, better but also more appropriate solutions exist for reliable business domain messaging across portlets.

                      That said, you are welcome to open a JIRA feature request for such a feature and make a case for it. :)

                      • 8. Re: Cross Page wiring in JBoss
                        Søren Hilmer Newbie

                        I argue that it can be in the realm of UI. In my setup I have 2 physical monitors and a browser window is shown on each monitor. I would like to display different portal pages in these browser windows and have the portlets loaded on these pages to interoperate.
                        In this setup I am perfectly able to see "everything" at the same time.

                        • 9. Re: Cross Page wiring in JBoss
                          Chris Laprun Master

                          Fair enough. Like I said, feel free to open a JIRA for it if you think this is something that is really missing and for which a valid set of use cases can be identified.

                          We always consider new features if they make sense but we won't implement something just because someone else supports it. :)

                          • 10. Re: Cross Page wiring in JBoss
                            Hardy Massen Novice

                            Hi,

                            to clarify this issue to me:

                            According to JSR 286 a portlet will not react upon a Portlet-Event, if it is on a page, that is not the current viewed page, right?

                            This leads me to another question:
                            As I understood, according to JSR 168 a portlet on a page, that is not the current viewed page, does not even take part in the portlet-lifecycle, i.e. the renderResponse- and processAction-methods won't be invoked. Is this correct?

                            LeoLo

                            • 11. Re: Cross Page wiring in JBoss
                              Søren Hilmer Newbie

                              Hi

                              That sounds about right.

                              To me, what is not set in stone is, whether you can have more that one currently viewed page or not.
                              In a dual monitor setup this is easily achieved, and it would make sense for all portlets on the two pages to take part in the event distribution.

                              --Søren

                              • 12. Re: Cross Page wiring in JBoss
                                dorothy taylor Apprentice

                                Hi

                                I have a confusison here. We are talking about pages, but does the 286 spec even know anything about the pages. I mean creation of pages and aggregation of portlets on the pages is implemntation specific. A portlet cannot know of the page in which it is placed. Is this understanding incorrect?

                                • 13. Re: Cross Page wiring in JBoss
                                  Thomas Heute Master

                                  Dorothy you are right, the spec doesn't defines this as it doesn't own the notion of page.

                                  Hilmer's scenario is an interesting one, if the content on the other page updates itself with something like Ajax (otherwise the other page wouldn't get refreshed).

                                  Dorothy, you are also right that using the portlet API a portlet cannot know on which page it is, but most portal (such as JBoss Portal) offers an API to give you access to that info.

                                  • 14. Re: Cross Page wiring in JBoss
                                    dorothy taylor Apprentice

                                    Yeah, but as chris had suggested, I want to open a jira for the addition of the cross-page wiring feature. Need advise on how to do that. Pl. suggest

                                    Regards
                                    -D

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