seaside December 2005

seaside@lists.squeakfoundation.org

59 participants
54 discussions

Some questions about Seaside architecture
by Oleg Mürk 13 Dec '05

13 Dec '05

Hello, I have some questions about the internal implementation of Seaside. I have read Seaside docs including the article http://www.iam.unibe.ch/~scg/Archive/Papers/Duca04eSeaside.pdf but I would like to clarify some questions mostly revolving around continuations and back-button support. I don't have any experience with Smalltalk, so please forgive me using Java syntax in my examples. Also, please don't suggest to RTFS unless I ask something too stupid or complicated :) * How essential are continuations to the design of Seaside? * How is "blocking component call" implemented? My interpretation of section 8.4 of the article would be that when child component is called, a continuation is taken, and essentially the follwoing code is executed: childComponent.addOnAnswerEventHandler(continuation) decorator.replaceMe(childComponent) To be more precise, the continuation should be partial, with respect to the start of event handler. * If instead of "blocking calls", one would have primitive: callAsync(component, onCompleteEventHandler) how much the design of Seaside framework would change? Would it still use continuations? Or would it suffice to have event handlers (that never block) implemented using closures? * Is it possible to "block" for some events other than "answer". Would it be possible to write something like: buttonYes = new Button() buttonNo = new Button() eventYes = buttonYes.getOnClickEvent() eventNo = buttonNo.getOnClickEvent() event = eventOr (eventYes, eventNo) waitEvent(event) if (eventYes.hasOccured) message "You pressed Yes!" else message "You pressed No!" * Back-button suport: * Are continuations essential to back-button support? Or are they orthogonal? * Is 'registerObjectForBacktracking' essentially equivalent of Java serialization with exception that some objects are omitted? Does it make a shallow or deep copy of registered objects? Does it give substantially better memory footprint in useful configurations? ... as compared to copying whole application tree on each request. * How does 'registerObjectForBacktracking' work with garbage collection? Weak refereces? * Can one backtrack mutable variables within the closures that are not referenced from components? * Are Seaside sessions serializable? Are closures serializable in Smalltalk? * Would it be feasible to implement copy-on-change saving of snapshots for backtracking? * What is Your opinion, whether it would be feasible to implement Java version of Seaside using: http://jakarta.apache.org/commons/sandbox/javaflow/ (note that this is weaker than real continuations & call/cc) and not using Java threads to imitate continuations like LakeShore does: http://lakeshore.sourceforge.net/usersguide.shtml Or is there some other important language feature missing? As a side note, I have participated in creating (an internal) Java web framework which allows building composite hierarchies of components with event-handling. Based on this one could easily implement both reusable widgets (form controls, lists) and such things as CallStackComponent, TabbedComponent, WizardComponent, etc. I can confirm that possibility of having CallStackComponent at an arbitrary place in component tree allows building miraculously well-decomposed UI :) But we didn't use continuations in any form, so essentially each component was defined by a bunch of event handlers. Keep up the good work, Oleg Mürk

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Displaying international text
by Wilkes Joiner 13 Dec '05

13 Dec '05

I have a string that I am reading from the iTunes xml. Characters with accent marks are being displayed as ? in Firefox and the equivalent in Safari. I haven't tried IE. Everything is fine within the squeak image, and as far as I can tell they are being displayed properly when viewing other sites. I've tried setting the content type by using updateRoot:, but nothing seems to work. Here is a sample string in Squeak: 'Alfredo Rodríguez' rendered by seaside: Alfredo Rodr�guez Any ideas? Thanks, Wilkes

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RE: [Seaside] Some questions about Seaside architecture
by Ramon Leon 13 Dec '05

13 Dec '05

> I don't agree with You. I don't want to start philosophical > discussion > whether rich UI should have back button (my opinion is NO, > Your opinion > is clearly YES). But there ARE very clean ways to forbid back button. Cees is correct, it doesn't matter what your opinion of the back button is, it's there, it isn't going away, trying to hack around it goes against the grain of what the web is. It's much smarter to simply accept the back button, even embrace it, seaside does this. > For instance: > * Application must be able to rerender itself without side effects > * Each response returns with (sequentially incremented) sequence ID > * If web server receives stale sequence ID, it just rerenders > the application's > last state and goes on. Optionally one could also display > warning message. Hacks that break the users expectation of what "HIS" back button should do on the web. People seem to forget that the application does not own the back button, the user does. It's no accident that people treat the back button as undo, being able to support this natural behavior makes Seaside more capable.

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include music in seaside web-app
by Tanguy Mezzano 12 Dec '05

12 Dec '05

where can i get info on how to include like a background mp3 music for a Seaside Web-App (working with Visual Works). Thanks in advance, Tanguy -- Tanguy Mezzano email: tanguy.mezzano(a)gmail.com gsm: 0479201571

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How do I test for deploymentMode?
by Todd Blanchard 11 Dec '05

11 Dec '05

I throw an exception handler around some iffy code when running normally, but this is a drag for debugging as it prevents the walkback. How do I test for deployment mode in the app?

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Little app I'm testing
by Blanchard, Todd 09 Dec '05

09 Dec '05

I've just deployed an early version of a seaside app I've been working on lately that checks correctness of web pages. http://blackbagops.net/seaside/html Thought I would share and perhaps get some free testing/feedback. There is a link to a feedback form on the first page of the app or you can email me comments. Two things I am interested in improving: 1) The initial rendering of the analysis takes a long time. Lots of this is browser and pipe I think, but it would be good to put up an interstitial page that refreshes periodically until the results are done. Not sure how to do that. 2) I think I might be stressing the canvas node model a bit performance wise with the page visualizer component and am wondering whether I can have it pre-render the output once and cache it on subsequent requests - what would be the good way to do that? Can I just make a renderer, call renderContentOn: with it, and then get its result as a String? This is running on a pretty crummy little server on a wireless lan over a dsl connection - patience is a virtue here. Squeak/Seaside ROCKS! -Todd Blanchard

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Online version of ShoreComponents is down
by astares＠gmx.de 08 Dec '05

08 Dec '05

Hi, http://shorecomponents.seaside.st is down. Any ideas? Thx Torsten -- Telefonieren Sie schon oder sparen Sie noch? NEU: GMX Phone_Flat http://www.gmx.net/de/go/telefonie

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Re: Some Real Estate app wroted in Squeak/Seaside
by Ian Prince 08 Dec '05

08 Dec '05

> Date: Sat, 03 Dec 2005 08:18:42 -0300 > From: German Arduino <gsa(a)softhome.net> > Subject: [Seaside] Some Real Estate app wroted in Squeak/Seaside > I'm starting a project with a new customer. The domain is Real Estate. > > Want to ask if someone know if already exist this sort of app in our > preferred environment (Squeak/Seaside). I believe Damien Cassou is developing something along those lines. http://kilana.unibe.ch:8888/GestionImmo/ "Gestion Parc Immobilier", based on Magritte+SmallWiki 2" Cheers, Ian.

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asCapitalizedPhrase
by Ross Boylan 07 Dec '05

07 Dec '05

'hi there' asCapitalizedPhrase -> 'Hi there' >From the name, I would expect every word to be capitalize, i.e., 'Hi There'. This appears to be a seaside2 method on String. Is this a bug?

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The Weekly Squeak No.14: November 20th - November 26th
by Giovanni Corriga 07 Dec '05

07 Dec '05

Dear squeakers, Hello, and welcome back to the The Weekly Squeak, a weekly report on what's going on in the world of Squeak. It seems like this past week has been a little slow on the news side. Could it be that the Squeak developer are working at making Squeak an even better system? Anyway, we are happy to provide you with a good mix of news from the various Squeak-related mailing lists. In this issue you'll find: 1. Pier 1.0.0 alpha: now with access control 2. A German Squeakland success story 3. SoapCore 0.8 on SqueakMap 4. A report on the Bern Smalltalk Gathering 5. @squeak-mentors.org 6. MCConfigurations quick howto 7. Squeakland and particle systems 8. SQLite3 FFI wrapper for Mac OS X 9. Squeak on an electronic paper display 10. Packaging media with Monticello 11. More work on the bootstrapped kernel image 12. Upcoming Squeak Chats You'll find the complete report at http://minnow.cc.gatech.edu/squeak/5740 . The past issues archive can be found at http://minnow.cc.gatech.edu/squeak/5751 . The Weekly Squeak has an RSS feed: http://people.squeakfoundation.org/person/gcorriga/rss.xml .

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seaside December 2005