[Lift] Re: Yahoo Lift error

2009-05-23 Thread Charles F. Munat

I'm getting it in Firebug when I try to use AJAX. It was working fine a 
month or two ago.

Here's the code that calls the AJAX. It adds or deletes a venue from an 
event.

def getVenuesBlock: NodeSeq = {
   val items = Model.createNamedQuery[Venue](findAllVenues).findAll
   val ev = Model.createNamedQuery[Event](findEventById,
 id - event.id).findOne.openOr(new Event())
   val allItems = items.toList.map((x: Venue) = {
 (x.id.toString, x.name)
   })
   val currentItems = JPA.setToWrapper(ev.venues).toList.map(
 (x: Venue) = {(x.id.toString, x.name)}
   )
   val unusedItems = (allItems -- currentItems)

   div class=venuesBlock
 div{
   if (currentItems.isEmpty)
 emNone/em
   else
 JPA.setToWrapper(ev.venues).toList.map(
   (x: Venue) = {
 div id={venues + x.id.toString}{
   SHtml.ajaxButton(-,
 () = {
   val item = Model.getReference[Venue](classOf[Venue],
 x.id)
   val ev = Model.getReference[Event](classOf[Event],
 event.id)
   ev.venues.remove(item)
   Model.merge(ev)
   Model.flush()
   SetHtml(venuesBlock, getVenuesBlock)
 },
 (title, Remove this venue),
 (class, removeButton)
   )
 }{x.name}/div
   }
 )
   }/div
   {
 if (unusedItems.isEmpty)
   Text()
 else
   div id=addVenue{
 SHtml.ajaxForm(
   pinput type=submit value=+ class=addButton
 title=Add this venue/ {
   SHtml.select(unusedItems, Empty,
 (id: String) = {
   val item =
 Model.getReference[Venue](classOf[Venue],
   id.toLong)
   val ev = Model.getReference[Event](classOf[Event],
 event.id)
   ev.venues.add(item)
   Model.merge(ev)
   Model.flush()
   SetHtml(venuesBlock, getVenuesBlock)
 },
 (id, selectVenue)
   )
 }
   /p
 )
   }/div
   }
   /div
}

David Pollak wrote:
 Are you getting it in the console... in the browser... where?  What are 
 you doing to get the message?
 
 On Fri, May 22, 2009 at 9:31 PM, Charles F. Munat c...@munat.com 
 mailto:c...@munat.com wrote:
 
 
 Any idea why I'm getting this:
 
 YAHOO.lift is undefined
 lift_actualAjaxCall(F1048611400615MAS=true, function(),
 function())liftAjax.js (line 134)
 lift_doAjaxCycle()liftAjax.js (line 105)
 lift_ajaxHandler(F1048611400615MAS=true, null, null)liftAjax.js
 (line 16)
 onclick(click clientX=132, clientY=431)g95xgMP4...YfQ%3D%3D (line 2)
 [Break on this error] url =
 YAHOO.lift.buildURI(addPageName('/...nSuccess(res);}, failure :
 onFailure });
 
 Chas.
 
 
 
 
 
 -- 
 Lift, the simply functional web framework http://liftweb.net
 Beginning Scala http://www.apress.com/book/view/1430219890
 Follow me: http://twitter.com/dpp
 Git some: http://github.com/dpp
 
  

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[Lift] Re: Some questions about menu MetaMegaProtoUser

2009-05-23 Thread Jeppe Nejsum Madsen

Thanks for the rapid feedback. A few comments below

On Fri, May 22, 2009 at 6:12 PM, David Pollak
feeder.of.the.be...@gmail.com wrote:

[...]

 def onLoginPage: Boolean = S.request.flatMap(_.location.map(_.name ==
 Login)) openOr false

 override def screenWrap: Box[NodeSeq] = Full(if (onLoginPage)
     lift:surround with=login_template at=contentlift:bind
 //lift:surround
         else lift:surround with=default at=contentlift:bind
 //lift:surround)

Ahh didn't realize screenWrap was dynamically evaluated. Nice.

Being new to Scala I spent some time trying to decode:

def onLoginPage = S.request.flatMap(_.location.map(_.name == Login))
openOr false

Am I correct in that it basically evaluates S.request.location.name ==
Login with proper handling of Empty/Full boxes?
If yes, is there a good rule of thumb when to use flatMap/map or do I
just need more Scala time before this becomes natural?

 2) I would like to have a primary navigation menu at the top, and each
 primary menu item should have some secondary and tertiary menu items
 shown at the left. Only the secondary/tertiary items for the currently
 selected primary menu item should be visible. I believe I can render
 the primary menu items using a LocGroup, but how do I render the
 current subitems on the left sidebar?

 Getting the top level menu items:

 def topMenuItems: List[MenuItem] =
 S.request.toList.flatMap(_.buildMenu.lines)

Works like a charm.

 Getting the secondary menu items:
   def secondaryMenuItems: Seq[MenuItem] =
   for {
     req - S.request.toList
     line - req.buildMenu.lines
     kid - line.kids
   } yield kid

While this does get all the current secondary menu items, I need all
the current secondary menu items as well as their children (and their
children) since I'll be handling the structure client side. I tried
various combinations and hacking of the Menu snippet but can't seem to
render all the children. Part of the problem is probably that I don't
really know the Menu/MenuItem/Loc structure very well and the
Scaladocs are.somewhat lacking :-)

I'll keep trying to decipher the source to come up with something, but
any further insights will be appreciated

/Jeppe

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[Lift] Re: Robust and clear ways to do performant JDBC?

2009-05-23 Thread Oliver Lambert
Yes, I helped with the code!

On Sat, May 23, 2009 at 9:28 PM, Timothy Perrett timo...@getintheloop.euwrote:



 To what degree are you wanting to re-invent the wheel? Derek has done
 amazing work with JPA and Scala - the resulting output being scala-jpa and
 the jpa archetypes for lift. Are you familiar with them?

 Cheers, Tim

 On 23/05/2009 11:56, Oliver Lambert olambo...@gmail.com wrote:

  JPA is a ORM tool. I think it would be great if someone would create a
  Scala solution using JPA as the starting point - any takers?
 



 


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[Lift] Re: New Lift Actor code

2009-05-23 Thread Timothy Perrett

David, this is extremely interesting.

Given the points you outlined this makes perfect sense to move from
scala.actors - however, if come the 2.8 release EPFL fix the actors
library so that it then becomes acceptable to use within lift again,
would you want to move back to it? IMO, and as you said in your mail,
you (or indeed we) have no interest in maintaing our own actors
implementation and it seems like it would be most optiomal to use the
EPFL implementation when it becomes appropriate to.

Cheers, Tim

On May 23, 6:19 am, David Pollak feeder.of.the.be...@gmail.com
wrote:
 Folks,

 It is not lightly that I've made the decision to write an alternative Actor
 library and move the Lift code base from the Scala Actors to Lift Actors
 (working name).  I want to spend a little time talking about the steps that
 led to the decision as well as the impact that it will have on Lift code.

 Since November, I've been chasing a series of memory leaks in the Actor
 library.  Philipp Haller from EPFL has been responsive in addressing the
 individual memory leaks, but the issue seems to be one of whack-a-mole...
 each time one memory leak is fixed, another one appears.  Further, the
 existing Actor architecture does not lend itself to the kind of Actor usage
 cycle that we find in Lift apps.  Specifically:

    - Lift creates/destroys an Actor for each Comet request.  This rapid
    creation/destruction of Actors caused memory back-ups, and the existing
    Actor code seems to be oriented to long running Actors rather than Actors
    with Object-length lifespans.
    - The FJ libraries used for Actor scheduling have problems on multi-core
    machines and are also a source of memory retention issues.
    - Replacing the FJ libraries with a scheduler based on
    java.util.concurrent exposes race/deadlock conditions related to the fact
    that some parts of the Actor processing (e.g., testing mailbox items 
 against
    partial functions while the Actor itself is synchronized)
    - The Actors require external threads to function and it's not possible
    to create external threads in the Google App Engine (making Actor-based
    functionality including CometActors non-functioning in GAE apps)
    - Actors are fragile when exceptions are thrown
    - Actors have running and not running states (as compared with objects
    which can always respond to message sends).  In practice, managing the
    running and not running states is as hard as managing memory in C.
    - There are hidden actors associated with each thread which display the
    above fragility and state management issues
    - And as a practical matter, I've got a couple of applications that are
    going into production over the next few weeks and cannot wait for the
    various fixes to make it into Scala 2.8 and the hacks and work-arounds that
    I've done to the 2.7.4 Actor libraries became too complex for my comfort.

 I have written a simple Actor class that is focused on message sending and
 processing of messages asynchronously.  This means there's a single
 operation that you can perform on Actors, the message send operation.
 Actors can be specicialized (they only access messages of a certain type).
 In order to receive a response from an Actor, you can pass in a Future as
 part of the message and that Future may be satisfied asynchronously.  This
 means that a sender of a message need not be an Actor and that the Actor
 recipient of a message cannot determine the sender of a message.  Actors
 have two bits of internal state: a mailbox and a flag indicating that the
 Actor is currently processing messages in its mailbox.  The amount of
 synchronization of Actors is minimal (on inserting messages into the
 mailbox, on removing messages from the mailbox, and on changing state
 to/from processing messages.)

 An Actor instance must provide a messageHandler method which returns a
 PartialFunction that is used to pattern match against the messages in the
 mailbox.  The instance may also provide an optional exception handler that
 is called if an Exception is thrown during the handling of a message.

 The Actor is guaranteed to only be processing one message at a time and the
 Actor is guaranteed not to be in a monitor (synchronized) during the
 processing of messages.  An Actor is guaranteed to maintain the order of the
 messages in its mailbox, however, messages that do not currently match the
 messageHandler will be retained in the order that they were received in the
 event that the messageHandler changes and they can be processed.

 The Lift Actors will, by default, use the java.util.concurrent library for
 thread pooling, although I have worked out a mechanism for
 thread-piggy-backing such that if the Actors are running in GAE, they need
 not use any additional thread (this will enable Lift's comet support in
 GAE.)  There will also be a scheduler (much like the existing ActorPing)
 which will send a message to an Actor at some time in the 

[Lift] Re: Robust and clear ways to do performant JDBC?

2009-05-23 Thread Timothy Perrett

Lol! Sorry oliver... I remember now :)

What did you have in mind for ³scala solution using JPA²? Is this not what
we have already?

Cheers, Tim

On 23/05/2009 12:33, Oliver Lambert olambo...@gmail.com wrote:

 Yes, I helped with the code!
 
 On Sat, May 23, 2009 at 9:28 PM, Timothy Perrett timo...@getintheloop.eu
 wrote:
 
 
 To what degree are you wanting to re-invent the wheel? Derek has done
 amazing work with JPA and Scala - the resulting output being scala-jpa and
 the jpa archetypes for lift. Are you familiar with them?
 
 Cheers, Tim
 
 On 23/05/2009 11:56, Oliver Lambert olambo...@gmail.com wrote:
 
  JPA is a ORM tool. I think it would be great if someone would create a
  Scala solution using JPA as the starting point - any takers?
   
 
 
 
 
 
 
  
 


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[Lift] Re: Robust and clear ways to do performant JDBC?

2009-05-23 Thread Oliver Lambert
When I want to have user defined types, I have to write them as a Hibernate
hack to JPA - Id rather not be wedded to Hibernate.When I get a collection
out of a returned entity, I have to use JCL to wrap it. I'd rather, have
everything in Scala collections.
When I have a read only entity, I'd like it to be immutable. In fact, maybe
all entities should be, but thats probably too hard.
I'm just taking about the lower layer of JPA that Derek's stuff hooks into -
its OK for Java, it kind of sucks for Scala.

Just my thoughts, don't expect anyone to agree.

cheers
Oliver

On Sat, May 23, 2009 at 9:41 PM, Timothy Perrett timo...@getintheloop.euwrote:


 Lol! Sorry oliver... I remember now :)

 What did you have in mind for “scala solution using JPA”? Is this not what
 we have already?

 Cheers, Tim


 On 23/05/2009 12:33, Oliver Lambert olambo...@gmail.com wrote:

 Yes, I helped with the code!

 On Sat, May 23, 2009 at 9:28 PM, Timothy Perrett timo...@getintheloop.eu
 wrote:



 To what degree are you wanting to re-invent the wheel? Derek has done
 amazing work with JPA and Scala - the resulting output being scala-jpa and
 the jpa archetypes for lift. Are you familiar with them?

 Cheers, Tim

 On 23/05/2009 11:56, Oliver Lambert olambo...@gmail.com wrote:

  JPA is a ORM tool. I think it would be great if someone would create a
  Scala solution using JPA as the starting point - any takers?
 









 


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[Lift] Re: Robust and clear ways to do performant JDBC?

2009-05-23 Thread Timothy Perrett
Interesting...

Have you seen jorge's scala utils? Perhaps we could do some magic with  
that to manage translations between java.util.list etc to native scala  
types...?

Cheers, Tim

Sent from my iPhone

On 23 May 2009, at 12:58, Oliver Lambert olambo...@gmail.com wrote:

 When I want to have user defined types, I have to write them as a  
 Hibernate hack to JPA - Id rather not be wedded to Hibernate.
 When I get a collection out of a returned entity, I have to use JCL  
 to wrap it. I'd rather, have everything in Scala collections.
 When I have a read only entity, I'd like it to be immutable. In  
 fact, maybe all entities should be, but thats probably too hard.
 I'm just taking about the lower layer of JPA that Derek's stuff  
 hooks into - its OK for Java, it kind of sucks for Scala.

 Just my thoughts, don't expect anyone to agree.

 cheers
 Oliver

 On Sat, May 23, 2009 at 9:41 PM, Timothy Perrett timo...@getintheloop.eu 
  wrote:

 Lol! Sorry oliver... I remember now :)

 What did you have in mind for “scala solution using JPA”? Is this  
 not what we have already?

 Cheers, Tim


 On 23/05/2009 12:33, Oliver Lambert olambo...@gmail.com wrote:

 Yes, I helped with the code!

 On Sat, May 23, 2009 at 9:28 PM, Timothy Perrett timo...@getintheloop.eu 
  wrote:


 To what degree are you wanting to re-invent the wheel? Derek has done
 amazing work with JPA and Scala - the resulting output being scala- 
 jpa and
 the jpa archetypes for lift. Are you familiar with them?

 Cheers, Tim

 On 23/05/2009 11:56, Oliver Lambert olambo...@gmail.com wrote:

  JPA is a ORM tool. I think it would be great if someone would  
 create a
  Scala solution using JPA as the starting point - any takers?
 












 

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[Lift] LiftRules.unloadHooks problem

2009-05-23 Thread Ewan

After banging my head trying to get Jetty to shutdown cleanly having
been playing with actors I came across   this entry in the wiki
http://wiki.liftweb.net/index.php/FAQ#How_do_I_execute_code_when_my_application_is_unloaded.3F
which suggests adding your own function to LiftRules.unloadHooks
except LiftRules.unloadHooks += myUnloader _ does not compile due to
reassignment to val but LiftRules.unloadHooks.append(myUnloader)
does.  Has my lack of Scala experience got the better of me again or
has the api changed since the wiki entry was added?

-- Ewan

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[Lift] Re: project stockholm

2009-05-23 Thread David Pollak
On Sat, May 23, 2009 at 2:34 AM, Jostein Stuhaug jost...@solidsystem.nowrote:


 Off topic, but I could not help myself.


Speaking of off topic, too bad there's not a Nobel Geek Prize... :-)



 The Nobel Peace Prize is in fact awarded in Oslo, all the others are
 given out in Stockholm. But I guess it's not the peace prize you are
 aiming for... Keep up the good work though, who knows what might happen..

 Regards,
 Jostein.


 Charles F. Munat wrote:
  Dynamite!
 
  Meredith Gregory wrote:
 
  Charles,
 
  Stockholm's feature set competes with Microsoft's Oslo; but Stockholm is
  where you receive the Nobel Prize.
 
  Best wishes,
 
  --greg
 
  On Thu, May 21, 2009 at 8:02 PM, Charles F. Munat c...@munat.com
  mailto:c...@munat.com wrote:
 
 
  Because of Stockholm Syndrome?
 
  Meredith Gregory wrote:
All,
   
i've been working in earnest on a little open source project for
 DSL
generation
  git%20clone%20git://github.com/leithaus/stockholm.git%20
  http://github.com/leithaus/stockholm.git%20
that my wife suggested i call stockholm (whom am i to argue). At
 this
point it's just about syntax, not execution. From a BNF file you
  generate
   
* a web-hosted parser/repl
* the abstract syntax class of the parser support visitor
 pattern
  traversal
* a set of subclasses that map the abstract syntax to store
  o right now i've got SQL via a JPA layer
  o shortly i will also have an XML persistence layer via
  DBXML
   
Slightly burdensome dependencies
   
* i use BNFC which means you need Haskell + Happy + Alex
  installed
  on your system. (On a mac this is port install Haskell,
 port
  install Happy, port install Alex.)
* When the XML persistence comes on line there will be a
  dependency
  on DBXML.
* Neither of these dependencies play nicely with maven. i've
 got
  some strategies for workin around this for the parser
  generator,
  but not for the XML persistence layer.
   
In a not too distant release i will add some support for
  specifying and
generating operational semantics via techniques borrowed from
 Peter
Sewell's Ott.
   
Best wishes,
   
--greg
   
--
L.G. Meredith
Managing Partner
Biosimilarity LLC
1219 NW 83rd St
Seattle, WA 98117
   
+1 206.650.3740
   
http://biosimilarity.blogspot.com
   

 
 
 
 
 
  --
  L.G. Meredith
  Managing Partner
  Biosimilarity LLC
  1219 NW 83rd St
  Seattle, WA 98117
 
  +1 206.650.3740
 
  http://biosimilarity.blogspot.com
 
 
 
  
 

 



-- 
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Beginning Scala http://www.apress.com/book/view/1430219890
Follow me: http://twitter.com/dpp
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[Lift] Re: LiftRules.unloadHooks problem

2009-05-23 Thread David Pollak
On Fri, May 22, 2009 at 11:31 PM, Ewan ehar...@gmail.com wrote:


 After banging my head trying to get Jetty to shutdown cleanly having
 been playing with actors I came across   this entry in the wiki

 http://wiki.liftweb.net/index.php/FAQ#How_do_I_execute_code_when_my_application_is_unloaded.3F
 which suggests adding your own function to LiftRules.unloadHooks
 except LiftRules.unloadHooks += myUnloader _ does not compile due to
 reassignment to val but LiftRules.unloadHooks.append(myUnloader)
 does.  Has my lack of Scala experience got the better of me again or
 has the api changed since the wiki entry was added?


Yeah, the API changed pretty radically in November and December of last
year.

We've had a bunch of ill-fated attempts to find a wiki gardener... someone
who will go through the wiki, find stuff that needs changing and make a list
or enter tickets into our GitHub ticket system.  With a list of needed
changes, there are a fair number of us who can make those changes.




 -- Ewan

 



-- 
Lift, the simply functional web framework http://liftweb.net
Beginning Scala http://www.apress.com/book/view/1430219890
Follow me: http://twitter.com/dpp
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[Lift] Re: Some questions about menu MetaMegaProtoUser

2009-05-23 Thread David Pollak
On Sat, May 23, 2009 at 4:20 AM, Jeppe Nejsum Madsen je...@ingolfs.dkwrote:


 Thanks for the rapid feedback. A few comments below

 On Fri, May 22, 2009 at 6:12 PM, David Pollak
 feeder.of.the.be...@gmail.com wrote:

 [...]

  def onLoginPage: Boolean = S.request.flatMap(_.location.map(_.name ==
  Login)) openOr false
 
  override def screenWrap: Box[NodeSeq] = Full(if (onLoginPage)
  lift:surround with=login_template at=contentlift:bind
  //lift:surround
  else lift:surround with=default at=contentlift:bind
  //lift:surround)

 Ahh didn't realize screenWrap was dynamically evaluated. Nice.

 Being new to Scala I spent some time trying to decode:

 def onLoginPage = S.request.flatMap(_.location.map(_.name == Login))
 openOr false


If you were writing code with a high McCabe number it would look like:

def onLoginPage = {
  val boolBox: Box[Boolean] = if (S.request.isDefined) {
val req = S.request.open_! // note never use open_! unless you know the
Box is Full
if (req.location.isDefined) {
  val loc = req.location.open_!
  Full(loc.name == Login)
} else Empty
  } else Empty

  if (boolBox.isDefined) boolBox.open_! else false
}


You can also write the code in a for comprehension:

def onLoginPage = {
  val bb =
for {
  req - S.request
  loc - req.location
} yield loc.name == Login

  bb openOr false
}




 Am I correct in that it basically evaluates S.request.location.name ==
 Login with proper handling of Empty/Full boxes?
 If yes, is there a good rule of thumb when to use flatMap/map or do I
 just need more Scala time before this becomes natural?


When you are dealing with Box/Option, its good to either use map/flatMap or
the for comprehension (which is syntactic sugar for map/flatMap)




  Getting the secondary menu items:
def secondaryMenuItems: Seq[MenuItem] =
for {
  req - S.request.toList
  line - req.buildMenu.lines
  kid - line.kids
} yield kid

 While this does get all the current secondary menu items, I need all
 the current secondary menu items as well as their children (and their
 children) since I'll be handling the structure client side. I tried
 various combinations and hacking of the Menu snippet but can't seem to
 render all the children. Part of the problem is probably that I don't
 really know the Menu/MenuItem/Loc structure very well and the
 Scaladocs are.somewhat lacking :-)

 I'll keep trying to decipher the source to come up with something, but
 any further insights will be appreciated


Each MenuItem has a kids property which is the submenus.  You can recurse
into the kids on display.  The net.liftweb.http.snippet.Menu.scala code has
examples of this.

Thanks,

David




 /Jeppe

 



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[Lift] Re: New Lift Actor code

2009-05-23 Thread David Pollak
On Sat, May 23, 2009 at 7:39 AM, Martin Ellis ellis@gmail.com wrote:


 On Sat, May 23, 2009 at 6:19 AM, David Pollak
 feeder.of.the.be...@gmail.com wrote:
  I am happy to share the Lift Actor code with EPFL and if it makes it into
  the Scala distribution as SimpleActors or something similar, I'm totally
  cool with that.  I'm not interested in owning or maintaining an Actor
  library.  I am however, dedicated to making sure that Lift apps can run
 in
  production for months (or even years) without retaining memory or having
  other problems that can impact the stability of applications.

 The cool thing about this is that it provides solid evidence that Scala -
 as a language - does satisfy the aim of being be a scalable language.


Yes, this is absolutely right.  It also points up what I missed in my
original posting... the amazing value of the Scala Actors which include:

   - First, and most important to Lift, a conceptual framework for doing
   concurrency.  Without the Actor model, Lift would not have such a rich model
   for building interactive applications.
   - A design that keeps true to the Erlang Actor model in that it supports
   linking, run states, and other things that make an OTP style library
   possible. (Hey Jonas, where's that OTP library?)
   - A design that has evolved from simply supporting send/wait-for-response
   (!?) to send and immediately receive Future and other cool features.
   - Blocking until Futures are satisfied without consuming a thread if the
   Future was within a react-based Actor.
   - An implementation that worked well in JDK 1.4.  Many of the current
   memory and scheduling issues are a result of the fact that Scala's Actors
   worked on JDK 1.4, back when 1.4 was the target for the Scala distribution.

Scala is a language that supports multiple Actor libraries, just as it
supports multiple collections libraries.  There are no built-in collections
classes in Scala.  All collections are implemented at the library level.
And just as there were defects in some on the Scala collections classes that
David MacIver fixed, there are existing defects in the Actor libraries.
Just as there are specialized Map() collections that are appearing for Scala
that maximize performance for particular data types and/or key
distributions, we are creating a specialized Actor library that's optimized
for the kind of use that we see in Lift and web apps in general.

This is a testament to Scala's flexibility and to the foresight of including
such a powerful concurrency library, Actors, as part of the distribution.
But for those two things, Lift would not be nearly as cool as it is.

So, please do not read this thread as a repudiation of the Scala Actor
library, please read it as an expansion of what is possible within Scala.

Thanks,

David




 I'm referring to the fact that Scala actors are not part of the core
 language.
 They're just a library that can be replaced with a different library, which
 can
 also to provide the 'feel' of native language support for objects of that
 type.
 It's such a fundamental part of the language design that Programming in
 Scala talks about it in Chapter 1, Section 1.

 It's timely that you sent the email so soon after the link to the Guy
 Steele
 Growing a Language OOPSLA presentation (of which I am still in awe)
 went around on twitter.
 http://video.google.com/videoplay?docid=-8860158196198824415

 I guess this demonstrates that Scala provides the features for growth that
 Steele says are needed for languages to be successful in the long term,
 and that he would have liked Java to have.  Awesome.

 Nice, clear explanation, by the way.  Should avoid any any NIH allegations
 on
 the diggs and reddits of the world ;o)

 Martin

 



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[Lift] Problems with redirect after login and protected pages

2009-05-23 Thread Jeppe Nejsum Madsen

Hi.

I want to protect all pages in the app (except login :-) so if you try
to access a page, you get to the login page and after successful
login, you get redirected back to the requested page. I'm combining
the ideas from

http://groups.google.com/group/liftweb/browse_thread/thread/5d724fa1ab66a352/f27134216c81fc91

and

http://groups.google.com/group/liftweb/browse_thread/thread/5d724fa1ab66a352/f27134216c81fc91

I'm running 1.1-SNAPSHOT and extending the basic example with the following:

Boot.scala
val entries = Menu(Loc(Home, List(index), Home, Loc.EarlyResponse(
  () = Full(RedirectResponse(/user_mgt/login)).
  filter(ignore = !User.loggedIn_?))) ) :: User.sitemap

And User.scala
 object loginReferer extends SessionVar(/)

  override def homePage = {
var ret = loginReferer.is
loginReferer.remove()
ret
  }

  override def login = {
Log.info(Before Logging in S:+S + , loggedIn:+User.loggedIn_?
+  ref:+loginReferer.is+ S.ref: +S.referer)
for (r - S.referer if loginReferer.is == /) loginReferer.set(r)
super.login
  }

Here are the issues:
- When I hit http://localhost:8080/ I get to the login page ok, after
login I get the homepage but with an error:
  already logged in. Please logout first.
- If I try to access another page, I always gets redirected to the
home page after login (with the same error)

It seems the problems are caused by an empty referrer as seen in the
logs below. This makes sense since the original request to / doesn't
contain a referer, the redirect doesn't either.

So the question is: is there a better way to capture the original page
the user was requesting? Since the redirect happens in the
EarlyResponse I was wondering if it was possible to just tack it on as
a parameter in the RedirectReponse. But is there a better way?

/Jeppe


Navigate to /
INFO - Service request (GET) / took 249 Milliseconds
INFO - Before login - ref:/, S.ref: Empty
INFO - Service request (GET) /user_mgt/login;jsessionid=e7pkao54lhcm
took 156 Milliseconds
INFO - Service request (GET) /images/ajax-loader.gif took 0 Milliseconds
INFO - Service request (GET) /favicon.ico took 0 Milliseconds

Enter login credentials

INFO - Before login - ref:/, S.ref:
Full(http://localhost:8080/user_mgt/login;jsessionid=e7pkao54lhcm)
INFO - Service request (POST) /user_mgt/login took 172 Milliseconds
INFO - Service request (GET) /user_mgt/login;jsessionid=e7pkao54lhcm
took 0 Milliseconds
INFO - Service request (GET) / took 31 Milliseconds

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[Lift] Re: Problems with redirect after login and protected pages

2009-05-23 Thread Jeppe Nejsum Madsen

On Sat, May 23, 2009 at 6:22 PM, Jeppe Nejsum Madsen je...@ingolfs.dk wrote:
 Hi.

 I want to protect all pages in the app (except login :-) so if you try
 to access a page, you get to the login page and after successful
 login, you get redirected back to the requested page. I'm combining
 the ideas from
[...]

 It seems the problems are caused by an empty referrer as seen in the
 logs below. This makes sense since the original request to / doesn't
 contain a referer, the redirect doesn't either.

 So the question is: is there a better way to capture the original page
 the user was requesting? Since the redirect happens in the
 EarlyResponse I was wondering if it was possible to just tack it on as
 a parameter in the RedirectReponse. But is there a better way?

Reply to self: This seems to work:

 override def login = {
for {r - S.request
 ret - r.param(returnTo) if loginReferer.is == /}
loginReferer.set(ret)
super.login
  }

 val loggedIn = Loc.EarlyResponse(
  () =
Full(RedirectResponse(/profile//login?returnTo=+S.uri)).filter(ignore
= !User.loggedIn_?))

/Jeppe

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[Lift] Re: New Lift Actor code

2009-05-23 Thread Jonas Bonér

 First, and most important to Lift, a conceptual framework for doing
 concurrency.  Without the Actor model, Lift would not have such a rich model
 for building interactive applications.
 A design that keeps true to the Erlang Actor model in that it supports
 linking, run states, and other things that make an OTP style library
 possible. (Hey Jonas, where's that OTP library?)

Here it is the repo:
http://github.com/jboner/scala-otp/tree/master

Or do you mean that it has not happened much there for a while?
I certainly plan to expand it quite a lot, even have some code I could
make its way into it eventually.

-- 
Jonas Bonér

twitter: @jboner
blog:http://jonasboner.com
work:   http://crisp.se
work:   http://scalablesolutions.se
code:   http://github.com/jboner

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[Lift] Can't find scala jar

2009-05-23 Thread Charles F. Munat

I used the lift-archetype-jpa-blank archetype to build a new Lift app, 
then tried to compile and run it. I get an error from Maven that says it 
can't find scala 2.7.4:

[ERROR] BUILD ERROR
[INFO] -
[INFO] Failed to resolve artifact.

Missing:
--
1) org.scala-lang:scala-library:jar:2.7.4

Does one need to download and install the library jar, or is there 
something wrong here?

Thanks,
Chas.

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[Lift] Re: truncated urls

2009-05-23 Thread Channing Walton

done http://github.com/dpp/liftweb/issues/#issue/23

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[Lift] Re: Can't find scala jar

2009-05-23 Thread Charles F. Munat

Can't find the compiler jar, either. I installed both locally, and now 
when I run the app I get this:

[INFO] Starting jetty 6.1.16 ...
2009-05-23 14:49:09.691::INFO:  jetty-6.1.16
2009-05-23 14:49:09.877::INFO:  No Transaction manager found - if your 
webapp requires one, please configure one.
2009-05-23 14:49:10.304::WARN:  failed LiftFilter
java.lang.VerifyError: (class: net/liftweb/util/EmptyBox, method: 
open_$bang signature: ()Ljava/lang/Object;) Can only throw Throwable objects

Am I screwing things up here, or is there some problem with the archetype?

Thanks!
Chas.

Charles F. Munat wrote:
 I used the lift-archetype-jpa-blank archetype to build a new Lift app, 
 then tried to compile and run it. I get an error from Maven that says it 
 can't find scala 2.7.4:
 
 [ERROR] BUILD ERROR
 [INFO] -
 [INFO] Failed to resolve artifact.
 
 Missing:
 --
 1) org.scala-lang:scala-library:jar:2.7.4
 
 Does one need to download and install the library jar, or is there 
 something wrong here?
 
 Thanks,
 Chas.
 
  

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[Lift] Re: Can't find scala jar

2009-05-23 Thread David Pollak
Try:

rm -rf ~/.m2

mvn -clean install

Thanks,

David

On Sat, May 23, 2009 at 2:55 PM, Charles F. Munat c...@munat.com wrote:


 Can't find the compiler jar, either. I installed both locally, and now
 when I run the app I get this:

 [INFO] Starting jetty 6.1.16 ...
 2009-05-23 14:49:09.691::INFO:  jetty-6.1.16
 2009-05-23 14:49:09.877::INFO:  No Transaction manager found - if your
 webapp requires one, please configure one.
 2009-05-23 14:49:10.304::WARN:  failed LiftFilter
 java.lang.VerifyError: (class: net/liftweb/util/EmptyBox, method:
 open_$bang signature: ()Ljava/lang/Object;) Can only throw Throwable
 objects

 Am I screwing things up here, or is there some problem with the archetype?

 Thanks!
 Chas.

 Charles F. Munat wrote:
  I used the lift-archetype-jpa-blank archetype to build a new Lift app,
  then tried to compile and run it. I get an error from Maven that says it
  can't find scala 2.7.4:
 
  [ERROR] BUILD ERROR
  [INFO] -
  [INFO] Failed to resolve artifact.
 
  Missing:
  --
  1) org.scala-lang:scala-library:jar:2.7.4
 
  Does one need to download and install the library jar, or is there
  something wrong here?
 
  Thanks,
  Chas.
 
  

 



-- 
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Beginning Scala http://www.apress.com/book/view/1430219890
Follow me: http://twitter.com/dpp
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[Lift] Re: Can't find scala jar

2009-05-23 Thread Charles F. Munat

Nope. Still can't find it.

David Pollak wrote:
 Try:
 
 rm -rf ~/.m2
 
 mvn -clean install
 
 Thanks,
 
 David
 
 On Sat, May 23, 2009 at 2:55 PM, Charles F. Munat c...@munat.com 
 mailto:c...@munat.com wrote:
 
 
 Can't find the compiler jar, either. I installed both locally, and now
 when I run the app I get this:
 
 [INFO] Starting jetty 6.1.16 ...
 2009-05-23 14:49:09.691::INFO:  jetty-6.1.16
 2009-05-23 14:49:09.877::INFO:  No Transaction manager found - if your
 webapp requires one, please configure one.
 2009-05-23 14:49:10.304::WARN:  failed LiftFilter
 java.lang.VerifyError: (class: net/liftweb/util/EmptyBox, method:
 open_$bang signature: ()Ljava/lang/Object;) Can only throw Throwable
 objects
 
 Am I screwing things up here, or is there some problem with the
 archetype?
 
 Thanks!
 Chas.
 
 Charles F. Munat wrote:
   I used the lift-archetype-jpa-blank archetype to build a new Lift
 app,
   then tried to compile and run it. I get an error from Maven that
 says it
   can't find scala 2.7.4:
  
   [ERROR] BUILD ERROR
   [INFO]
 -
   [INFO] Failed to resolve artifact.
  
   Missing:
   --
   1) org.scala-lang:scala-library:jar:2.7.4
  
   Does one need to download and install the library jar, or is there
   something wrong here?
  
   Thanks,
   Chas.
  
   
 
 
 
 
 
 -- 
 Lift, the simply functional web framework http://liftweb.net
 Beginning Scala http://www.apress.com/book/view/1430219890
 Follow me: http://twitter.com/dpp
 Git some: http://github.com/dpp
 
  

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[Lift] jpa blank archetype

2009-05-23 Thread Charles F. Munat

Another weird thing about the JPA blank archetype: there is an 
index.html file that calls the default template, but the 
templates-hidden folder is missing (along with the default template).

Chas.

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[Lift] Re: Can't find scala jar

2009-05-23 Thread Charles F. Munat

Here is more detail on this error:

2009-05-23 15:41:20.856::INFO:  Logging to STDERR via 
org.mortbay.log.StdErrLog
[INFO] Context path = /
[INFO] Tmp directory =  determined at runtime
[INFO] Web defaults = org/mortbay/jetty/webapp/webdefault.xml
[INFO] Web overrides =  none
[INFO] Starting jetty 6.1.16 ...
2009-05-23 15:41:20.981::INFO:  jetty-6.1.16
2009-05-23 15:41:21.197::INFO:  No Transaction manager found - if your 
webapp requires one, please configure one.
2009-05-23 15:41:21.513::WARN:  failed LiftFilter
java.lang.VerifyError: (class: net/liftweb/util/EmptyBox, method: 
open_$bang signature: ()Ljava/lang/Object;) Can only throw Throwable objects
 at net.liftweb.http.LiftRules$.init(LiftRules.scala:184)
 at net.liftweb.http.LiftRules$.clinit(LiftRules.scala)
 at net.liftweb.http.LiftFilter.init(LiftServlet.scala:574)
 at 
org.mortbay.jetty.servlet.FilterHolder.doStart(FilterHolder.java:97)
 at 
org.mortbay.component.AbstractLifeCycle.start(AbstractLifeCycle.java:50)
 at 
org.mortbay.jetty.servlet.ServletHandler.initialize(ServletHandler.java:653)
 at org.mortbay.jetty.servlet.Context.startContext(Context.java:140)
 at 
org.mortbay.jetty.webapp.WebAppContext.startContext(WebAppContext.java:1239)
 at 
org.mortbay.jetty.handler.ContextHandler.doStart(ContextHandler.java:517)
 at 
org.mortbay.jetty.webapp.WebAppContext.doStart(WebAppContext.java:466)
 at 
org.mortbay.jetty.plugin.Jetty6PluginWebAppContext.doStart(Jetty6PluginWebAppContext.java:124)
 at 
org.mortbay.component.AbstractLifeCycle.start(AbstractLifeCycle.java:50)
 at 
org.mortbay.jetty.handler.HandlerCollection.doStart(HandlerCollection.java:152)
 at 
org.mortbay.jetty.handler.ContextHandlerCollection.doStart(ContextHandlerCollection.java:156)
 at 
org.mortbay.component.AbstractLifeCycle.start(AbstractLifeCycle.java:50)
 at 
org.mortbay.jetty.handler.HandlerCollection.doStart(HandlerCollection.java:152)
 at 
org.mortbay.component.AbstractLifeCycle.start(AbstractLifeCycle.java:50)
 at 
org.mortbay.jetty.handler.HandlerWrapper.doStart(HandlerWrapper.java:130)
 at org.mortbay.jetty.Server.doStart(Server.java:222)
 at 
org.mortbay.component.AbstractLifeCycle.start(AbstractLifeCycle.java:50)
 at 
org.mortbay.jetty.plugin.Jetty6PluginServer.start(Jetty6PluginServer.java:132)
 at 
org.mortbay.jetty.plugin.AbstractJettyMojo.startJetty(AbstractJettyMojo.java:441)
 at 
org.mortbay.jetty.plugin.AbstractJettyMojo.execute(AbstractJettyMojo.java:383)
 at 
org.mortbay.jetty.plugin.AbstractJettyRunMojo.execute(AbstractJettyRunMojo.java:210)
 at 
org.mortbay.jetty.plugin.Jetty6RunMojo.execute(Jetty6RunMojo.java:184)
 at 
org.apache.maven.plugin.DefaultPluginManager.executeMojo(DefaultPluginManager.java:451)
 at 
org.apache.maven.lifecycle.DefaultLifecycleExecutor.executeGoals(DefaultLifecycleExecutor.java:558)
 at 
org.apache.maven.lifecycle.DefaultLifecycleExecutor.executeStandaloneGoal(DefaultLifecycleExecutor.java:512)
 at 
org.apache.maven.lifecycle.DefaultLifecycleExecutor.executeGoal(DefaultLifecycleExecutor.java:482)
 at 
org.apache.maven.lifecycle.DefaultLifecycleExecutor.executeGoalAndHandleFailures(DefaultLifecycleExecutor.java:330)
 at 
org.apache.maven.lifecycle.DefaultLifecycleExecutor.executeTaskSegments(DefaultLifecycleExecutor.java:291)
 at 
org.apache.maven.lifecycle.DefaultLifecycleExecutor.execute(DefaultLifecycleExecutor.java:142)
 at org.apache.maven.DefaultMaven.doExecute(DefaultMaven.java:336)
 at org.apache.maven.DefaultMaven.execute(DefaultMaven.java:129)
 at org.apache.maven.cli.MavenCli.main(MavenCli.java:287)
 at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
 at 
sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:39)
 at 
sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:25)
 at java.lang.reflect.Method.invoke(Method.java:585)
 at 
org.codehaus.classworlds.Launcher.launchEnhanced(Launcher.java:315)
 at org.codehaus.classworlds.Launcher.launch(Launcher.java:255)
 at 
org.codehaus.classworlds.Launcher.mainWithExitCode(Launcher.java:430)
 at org.codehaus.classworlds.Launcher.main(Launcher.java:375)

Charles F. Munat wrote:
 Can't find the compiler jar, either. I installed both locally, and now 
 when I run the app I get this:
 
 [INFO] Starting jetty 6.1.16 ...
 2009-05-23 14:49:09.691::INFO:  jetty-6.1.16
 2009-05-23 14:49:09.877::INFO:  No Transaction manager found - if your 
 webapp requires one, please configure one.
 2009-05-23 14:49:10.304::WARN:  failed LiftFilter
 java.lang.VerifyError: (class: net/liftweb/util/EmptyBox, method: 
 open_$bang signature: ()Ljava/lang/Object;) Can only throw Throwable objects
 
 Am I 

[Lift] Re: Some questions about menu MetaMegaProtoUser

2009-05-23 Thread Jeppe Nejsum Madsen

On Sat, May 23, 2009 at 5:54 PM, Jeppe Nejsum Madsen je...@ingolfs.dk wrote:
 On Sat, May 23, 2009 at 4:52 PM, David Pollak
 feeder.of.the.be...@gmail.com wrote:

  Getting the secondary menu items:
    def secondaryMenuItems: Seq[MenuItem] =
    for {
      req - S.request.toList
      line - req.buildMenu.lines
      kid - line.kids
    } yield kid

 While this does get all the current secondary menu items, I need all
 the current secondary menu items as well as their children (and their
 children) since I'll be handling the structure client side. I tried
 various combinations and hacking of the Menu snippet but can't seem to
 render all the children. Part of the problem is probably that I don't
 really know the Menu/MenuItem/Loc structure very well and the
 Scaladocs are.somewhat lacking :-)

 I'll keep trying to decipher the source to come up with something, but
 any further insights will be appreciated

 Each MenuItem has a kids property which is the submenus.  You can recurse
 into the kids on display.  The net.liftweb.http.snippet.Menu.scala code has
 examples of this.

 I'm on it already

..and seem stuck. I have the following menu structure

M1
  M1.1
 M1.1.1
 M1.1.2
  M1.2
M2
 M2

etc. I can't seem to get all the third level items (M1.1.1, M1.1.2)
unless the active page is M1.1. Even if I put in lift:Menu.builder
expandAll=true/, they're only shown if I select M1.1.

The code above which yields kid, outputs M1.1 and M1.2 when M1 is
selected. When looking at the data, at seems like the kid.kids for
M1.1 is empty unless I'm on page M1.1.

What am I missing?

/Jeppe

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[Lift] The new LiftActor code is live

2009-05-23 Thread David Pollak
Folks,

The new LiftActor-based Lift is live in the new_actor branch in the
repository.

I'm running the new code on http://demo.liftweb.net  If all goes well, I'll
cut the main Lift branch over to the new code on Wednesday.

Thanks,

David

-- 
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[Lift] Namespace prefix error.

2009-05-23 Thread KaniniPazham

I am keep on getting the following error. Please help me. I have read
enough blogs to solve this... stll clueless for my limited knowledge.

error on line 81 at column 35: Namespace prefix question on subject is
not defined
error on line 86 at column 26: Namespace prefix question on detail is
not defined

lift:QS.add form=post
table
tr
td colspan=2question:subjectTo 
Do/question:subject/td
19
/tr
tr
tdDescription:/td
tdquestion:detailTo 
Do/question:detail/td
19
/tr
tr
tdnbsp;/td
tdquestion:submit
buttonNew/button
/question:submit/td
/tr
/table
/lift:QS.add

--
in my QS,scala

def add(form: NodeSeq)  : NodeSeq = {
var question: Question = new Question

def checkAndSave(): Unit = {
  if(question.save) {
  println(Saved)
  S.redirectTo(thank-you)
  }
}

bind(question, form,
subject - SHtml.text(question.subject, 
question.subject(_)),
detail - SHtml.text(question.detail, question.detail(_)),
submit - SHtml.submit(New, checkAndSave))

}

Mohan

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[Lift] Namespace prefix error.

2009-05-23 Thread KaniniPazham

I guess my previous post didn't reach.

I have tried enough to my lift knowledge, but need someone's help.

error on line 81 at column 35: Namespace prefix question on subject is
not defined
error on line 86 at column 26: Namespace prefix question on detail is
not defined

My snippet in QS.Scala.

lift:QS.add form=post
table
tr
td colspan=2question:subjectTo 
Do/question:subject/td
19
/tr
tr
tdDescription:/td
tdquestion:detailTo 
Do/question:detail/td
19
/tr
tr
tdnbsp;/td
tdquestion:submit
buttonNew/button
/question:submit/td
/tr
/table
/lift:QS.add



lift:QS.add form=post
table
tr
td colspan=2question:subjectTo 
Do/question:subject/td
19
/tr
tr
tdDescription:/td
tdquestion:detailTo 
Do/question:detail/td
19
/tr
tr
tdnbsp;/td
tdquestion:submit
buttonNew/button
/question:submit/td
/tr
/table
/lift:QS.add

Mohan

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