Jack, I reproduced your code and it seems to work fine. I've enclosed a working copy.
Some comments about your code:
- The foos variable and the foo variable may be getting confused in the
code... the render method may be rendering the same thing based on the
unchanging foos variable.
- Doing null testing is a sign that you have logic errors in your code.
I strongly recommend using either Box or Option for everything that can
logically not contain a value/reference. If you're bridging out to Java
code and are expecting null from the Java code, write a small bridge that
will wrapper the Java return values in Box/Option.
- You have a case class (Tick) that contains no parameters. Please use a
case object instead.
- Your Tick look is a spin loop. You fire a Tick message as part of
processing the Tick message. I would suggest that if you're polling, that
you have a reasonable poll interval, otherwise you'll starve your CPU.
Further, having reRender on each loop through means that you're forcing a
lot of bytes over the wire rather than only doing a reRender on changed
values.
Thanks,
David
On Sun, Nov 8, 2009 at 3:47 PM, Jack Widman <jack.wid...@gmail.com> wrote:
> Sorry. Here it is: As I said, I know that when render is called,
> foo.getValue has the right value. But it does not show on the screen, unless
> I refresh the browser.
>
> package com.foo.comet
>
> import net.liftweb._
> import http._
> import js._
> import JsCmds._
> import net.liftweb.util._
> import net.liftweb.http._
> import _root_.scala.xml._
> import scala.actors._
> import com.authoritude.snippet._
> import scala.collection.mutable.Queue
> import net.liftweb.http.SessionVar
>
>
> class MyComet extends CometActor {
>
> override def defaultPrefix = Full("auth")
>
> private var foos = FooManager.getFoos
>
> def createDisplay(foos:List[Foo]):NodeSeq = {
> <span id="go"><table>
> {
> for {foo <- foos} yield <tr><td>{foo.getValue}</td></tr>
> }
>
> </table></span>
> }
>
> def render = { bind("foo" -> createDisplay(foos)) }
>
> override def localSetup = {
> super.localSetup
> this ! Tick
> }
>
> var foo:Foo = null
> override def lowPriority = {
> case Tick => {
> foo=FooQueue.getLatest
> if (foo!=null && foo.getValue > -1) {
> blogs = FooManager.process(foo, foos)
> } else if (foo!=null){
> foos = foos.remove((f:Foo)=>(f.id==foo.id))
> }
> reRender(false)
> this ! Tick
> }
> }
> }
>
> case class Tick
>
>
>
> On Sun, Nov 8, 2009 at 5:31 AM, Timothy Perrett
> <timo...@getintheloop.eu>wrote:
>
>>
>> Without posting your code it's going to be tough to help you.
>>
>> Cheers, Tim
>>
>> Sent from my iPhone
>>
>> On 8 Nov 2009, at 08:14, jack <jack.wid...@gmail.com> wrote:
>>
>> >
>> > By the way, I know that when render is called, all the variables have
>> > the right values. I just don't see it on the screen unless I refresh
>> > it.
>> >
>> > On Nov 8, 3:12 am, jack <jack.wid...@gmail.com> wrote:
>> >> I have a CometActor. render is called when it is supposed to be but I
>> >> don't see the changes. If I refresh the page at anytime, I do see the
>> >> changes. Any idea what might cause this?
>> > >
>> >
>>
>>
>>
>
>
> --
> Jack Widman
>
> co-founder / cto, Authoritude, Inc.
>
> 203-641-9355
>
>
> >
>
--
Lift, the simply functional web framework http://liftweb.net
Beginning Scala http://www.apress.com/book/view/1430219890
Follow me: http://twitter.com/dpp
Surf the harmonics
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yaker.tgz
Description: GNU Zip compressed data
