Yeah,
I guess I'll be going down the thread path after all :)
If anyone comes up with a nice solution, please post it, I'd be very
interested.
Thanks,
Mike (the beginner one)
On 09/02/07, Paul Spencer <[EMAIL PROTECTED]> wrote:
Mikael,
I suggest the action should spawn a thread or post a "todo" for another
thread/process to do the actual work. This way the action will return
quickly.
Paul Spencer
Mikael Andersson wrote:
> Hi,
> I'm afraid I don't quite understand.
>
> First a little more on my problem:
>
> I have a page with at table where each row contains the status of a task
> and
> a commandLink to execute that task (a bit simplified). When ever that
page
> is refreshed it re-displays all tasks and their current status.
> My problem now is that when I click the commandLink, the page hangs
waiting
> for the action method to finish. I was hoping for an easy way to just
tell
> tell the browser via the response to go to a page (the same page in this
> case), without the action method finishing its execution.
>
> How can I have a refresh trigger a JSF action in plain JSF (without
using
> shale viewcontroller)?
>
> Thanks,
> Mike
>
> On 09/02/07, Mike Kienenberger <[EMAIL PROTECTED]> wrote:
>>
>> Right. I'm saying that you only use the refresh as a one-time timer
>> rather than an ongoing thing.
>>
>> You start at a page that is set to refresh.
>> The refresh triggers a normal JSF action.
>> The JSF servlet returns back an equivalent auto-refreshing page.
>> Repeat until the action returns back a different page.
>>
>> On 2/9/07, Mikael Andersson <[EMAIL PROTECTED]> wrote:
>> > The browser keeps waiting for the action method to finish (when
>> submitting),
>> > that is why I thought it might be possible to force a
redirect/forward
>> > programmatically so the action could do its length computation and
the
>> > progress page could be redisplayed (without starting a new thread).
>> >
>> > - mike
>> >
>> >
>> > On 08/02/07, Mike Kienenberger <[EMAIL PROTECTED]> wrote:
>> > > If it were me, I'd look at having a meta-refresh tag submit a
normal
>> > action.
>> > > The action would check the status of the background process, and
>> > > either return the "in progress" page again or return the "action
>> > > completed" page.
>> > >
>> > > You shouldn't need to anything strange like try to short-circult
the
>> > > JSF lifecycle or manually construct a response.
>> > >
>> > > On 2/8/07, Mikael Andersson < [EMAIL PROTECTED]> wrote:
>> > > > Looking for some more suggestions :), I would prefer not to use
>> ajax
>> > since
>> > > > it is quite a simple page.
>> > > >
>> > > > I have tried some more (hacky) stuff which didn't work either :(
:
>> > > >
>> > > > The below changed the location URL, but don't load the page?? Any
>> ideas.
>> > > >
>> > > > public static void programmaticForward2( final String viewId )
>> throws
>> > > > IOException{
>> > > > FacesContext faces = FacesContext.getCurrentInstance();
>> > > > HttpServletResponse response = (HttpServletResponse)
>> > > > faces.getExternalContext().getResponse();
>> > > >
>> > > > response.setContentType("text/html");
>> > > > response.setHeader("Location", "http://localhost:8080/dss";
>> > > > +viewId);
>> > > >
>> > > > faces.responseComplete();
>> > > > response.getOutputStream().flush();
>> > > > response.getOutputStream().close();
>> > > >
>> > > > }
>> > > >
>> > > > The below didn't do anything?
>> > > >
>> > > > public static void programmaticForward3( final String viewId )
>> throws
>> > > > IOException{
>> > > > FacesContext faces = FacesContext.getCurrentInstance();
>> > > > HttpServletResponse response = (HttpServletResponse)
>> > > > faces.getExternalContext().getResponse();
>> > > > HttpServletRequest request =
>> > > >
>> > (HttpServletRequest)faces.getExternalContext().getRequest();
>> > > >
>> > > > PrintWriter out = response.getWriter();
>> > > >
>> > > > response.setContentType("text/html");
>> > > > response.sendRedirect("http://"; +request.getServerName()
>> +":"
>> > > > +request.getServerPort() +"/dss" +viewId);
>> > > >
>> > > > faces.responseComplete();
>> > > > out.flush();
>> > > > out.close();
>> > > >
>> > > > }
>> > > >
>> > > > Cheers,
>> > > > Mike no.2
>> > > >
>> > > >
>> > > >
>> > > > On 07/02/07, Mike Kienenberger <[EMAIL PROTECTED]> wrote:
>> > > > > Here's an ajax solution for a progress bar:
>> > > > >
>> > > > >
>> > > >
>> >
>>
http://weblogs.java.net/blog/edburns/archive/2005/05/ajaxian_faces_p.html
>> > > > >
>> > > >
>> >
>>
https://blueprints.dev.java.net/bpcatalog/ee5/ajax/usingAJAXwithoutJSF.html
>>
>> > > > >
>> > > > > Seems like there should be a way to solve this without ajax,
>> though.
>> > > > > Maybe using a meta refresh.
>> > > > >
>> > > > >
>> > > > > On 2/7/07, Mikael Andersson < [EMAIL PROTECTED]> wrote:
>> > > > > > Hi,
>> > > > > > I have an action which performs a length operation, I'd like
to
>> get
>> > the
>> > > > > > browser to redisplay the page while the process keeps
>> running on
>> the
>> > > > server.
>> > > > > >
>> > > > > > I wonder how I perform a programmatic forward which in an
>> action
>> > method,
>> > > > > > which causes the browser to re-render the page while the
action
>> > method
>> > > > is
>> > > > > > still running.
>> > > > > >
>> > > > > > Is there a way of doing this without spawning a new Thread?
>> > > > > >
>> > > > > > I made the following futile attempt :
>> > > > > >
>> > > > > > Managed bean:
>> > > > > >
>> > > > > > public String longishRunningAction(){
>> > > > > >
>> > > > > > try{
>> > > > > > NavigationUtil.programmaticForward
>> > > > > > ("/report/index.xhtml");
>> > > > > > }
>> > > > > > catch(Exception e){}
>> > > > > >
>> > > > > > doLongishRunningOperation();
>> > > > > >
>> > > > > > return null;
>> > > > > > }
>> > > > > >
>> > > > > >
>> > > > > > Some of the stuff in here were added just to see if the made
a
>> > > > difference,
>> > > > > > they didn't :)
>> > > > > >
>> > > > > > public class NavigationUtil {
>> > > > > >
>> > > > > > /**
>> > > > > > * Force a forward programmatically
>> > > > > > *
>> > > > > > * @param viewId the viewId to forward to, ex.
>> > /report/index.xhtml
>> > > > > > * @throws ServletException
>> > > > > > * @throws IOException
>> > > > > > */
>> > > > > > public static void programmaticForward( final String
viewId
>> )
>> > throws
>> > > > > > ServletException, IOException{
>> > > > > >
>> > > > > > ExternalContext eCtx =
>> > > > > > FacesContext.getCurrentInstance().getExternalContext();
>> > > > > > HttpServletRequest request =
>> > > > > > (HttpServletRequest)eCtx.getRequest();
>> > > > > > HttpServletResponse response =
>> > > > > > (HttpServletResponse)eCtx.getResponse();
>> > > > > > RequestDispatcher dispatcher =
>> request.getRequestDispatcher(
>> > > > viewId
>> > > > > > );
>> > > > > >
>> > > > > > dispatcher.forward(request,response);
>> > > > > >
>> > > > > > FacesContext.getCurrentInstance().responseComplete();
>> > > > > >
>> > > > > > response.getOutputStream().flush();
>> > > > > > response.getOutputStream().close();
>> > > > > >
>> > > > > > }
>> > > > > >
>> > > > > > }
>> > > > > >
>> > > > > >
>> > > > >
>> > > >
>> > > >
>> > >
>> >
>> >
>>
>
