Re: [Flashcoders] Removing loaded swf...

2008-08-17 Thread Juan Pablo Califano 

The last parameter - here set to true - makes the reference to your
pageComplete function
weak. Meaning if this reference is the only reference left to your removed
object that object
becomes ready for garbage collection.


If I'm not wrong, technically, the function object could be removed before
the event even fires for the first time...

I've read a lot of times about this best practice, but I'm not really
sure if its such a good idea. From Grant Skinner's articles, it seems that
the rationale behind this is that since some people will forget to clean up
properly after them, let's just use weak refs and let's trust out good
luck -- at some point, the GC will do its job, so cross our fingers and hope
it doesn't run untimely and screw us. Honestly, I don't think that could
be rightfully called a best practice.

It rather looks like a source of hard to find bugs. You're basically saying
ok, I won't bother to clean up as I should, I'll just use a weak ref and
hope for the best, i.e. that the GC won't run before an event I'm listening
for is triggered and this best practice backfires at me.

I could be wrong, though, but I'd like to hear what others thinks about it.

Cheers
Juan Pablo Califano


2008/8/15, dr.ache [EMAIL PROTECTED]:

 Hi Sander.

 When you add an EventListener you should in 99% set the weak reference flag
 like this:

 mLoader.contentLoaderInfo.addEventListener( Event.COMPLETE,
 pageComplete,false,0,true );

 The last parameter - here set to true - makes the reference to your
 pageComplete function
 weak. Meaning if this reference is the only reference left to your removed
 object that object
 becomes ready for garbage collection. Have a look in the as3 language
 reference to learn more about it.

 Mark



 Sander Schuurman schrieb:

 Hi cool list!

 I'm trying do build a generic structure of pages (swf's) loaded in a main
 swf, and unloading as well ofcourse.
 Now I'm trying to unload a loaded swf, with the famous Garbage Collection.
 But I'm not sure I'm doing it the right way. Hope you could point me in the
 right direction.

 My code:

 private function loadPage( qUrl :String ) :void
 {
var mLoader:Loader= new Loader();
var mRequest:URLRequest = new URLRequest( qUrl );

mLoader.contentLoaderInfo.addEventListener( Event.COMPLETE,
 pageComplete );
mLoader.load( mRequest );
 }
 private function pageComplete( e :Event ) :void
 {
currentPage = e.currentTarget.content;

 currentPage.addEventListener( Page.PAGE_INIT, initPage );
currentPage.addEventListener( Page.GOTO_PAGE, gotoPage );

addChild(currentPage);
 }
 private function gotoPage( e :Event ) :void
 {
var nextPage = currentPage.gotoPage;

currentPage.removeEventListener( Page.PAGE_INIT, initPage );
currentPage.removeEventListener( Page.GOTO_PAGE, gotoPage );

var loader:Loader = Loader( e.target );
loader.unload();

loadPage( nextPage );
 }

 I'm not sure about the gotoPage method, if I can make a Loader object of
 the currentPage and unload it. Is it totally ready for the GC to be deleted?
 Thnx in advance.

 Sander
 ___
 Flashcoders mailing list
 Flashcoders@chattyfig.figleaf.com
 http://chattyfig.figleaf.com/mailman/listinfo/flashcoders





 ___
 Flashcoders mailing list
 Flashcoders@chattyfig.figleaf.com
 http://chattyfig.figleaf.com/mailman/listinfo/flashcoders

___
Flashcoders mailing list
Flashcoders@chattyfig.figleaf.com
http://chattyfig.figleaf.com/mailman/listinfo/flashcoders

Re: [Flashcoders] Removing loaded swf...

2008-08-17 Thread Juan Pablo Califano 
PD:

On a second thought, I guess I misundertood the issue

In this scenario:

private function listenerFunc(evt:Event):void {

}

someDispatcher.addEventListener( someEvent, listenerFunc);


listenerFunc has a ref count of 1 before adding it to someDispatcher (and
that count will be 2 if I'm not using weak red), so even if I used a weak
ref and the GC runs, as long as listenerFunc is still on scope, it won't be
collected (because it's ref count would be 1, not 0).

Still, removeEventListener should be called explicitly in my opinion, but I
guess my previous post was wrong...


Cheers
Juan Pablo Califano

2008/8/17, Juan Pablo Califano [EMAIL PROTECTED]:

 
 The last parameter - here set to true - makes the reference to your
 pageComplete function
 weak. Meaning if this reference is the only reference left to your removed
 object that object
 becomes ready for garbage collection.
 

 If I'm not wrong, technically, the function object could be removed before
 the event even fires for the first time...

 I've read a lot of times about this best practice, but I'm not really
 sure if its such a good idea. From Grant Skinner's articles, it seems that
 the rationale behind this is that since some people will forget to clean up
 properly after them, let's just use weak refs and let's trust out good
 luck -- at some point, the GC will do its job, so cross our fingers and hope
 it doesn't run untimely and screw us. Honestly, I don't think that could
 be rightfully called a best practice.

 It rather looks like a source of hard to find bugs. You're basically saying
 ok, I won't bother to clean up as I should, I'll just use a weak ref and
 hope for the best, i.e. that the GC won't run before an event I'm listening
 for is triggered and this best practice backfires at me.

 I could be wrong, though, but I'd like to hear what others thinks about it.

 Cheers
 Juan Pablo Califano


 2008/8/15, dr.ache [EMAIL PROTECTED]:

 Hi Sander.

 When you add an EventListener you should in 99% set the weak reference
 flag like this:

 mLoader.contentLoaderInfo.addEventListener( Event.COMPLETE,
 pageComplete,false,0,true );

 The last parameter - here set to true - makes the reference to your
 pageComplete function
 weak. Meaning if this reference is the only reference left to your removed
 object that object
 becomes ready for garbage collection. Have a look in the as3 language
 reference to learn more about it.

 Mark



 Sander Schuurman schrieb:

 Hi cool list!

 I'm trying do build a generic structure of pages (swf's) loaded in a main
 swf, and unloading as well ofcourse.
 Now I'm trying to unload a loaded swf, with the famous Garbage
 Collection. But I'm not sure I'm doing it the right way. Hope you could
 point me in the right direction.

 My code:

 private function loadPage( qUrl :String ) :void
 {
var mLoader:Loader= new Loader();
var mRequest:URLRequest = new URLRequest( qUrl );

mLoader.contentLoaderInfo.addEventListener( Event.COMPLETE,
 pageComplete );
mLoader.load( mRequest );
 }
 private function pageComplete( e :Event ) :void
 {
currentPage = e.currentTarget.content;

 currentPage.addEventListener( Page.PAGE_INIT, initPage );
currentPage.addEventListener( Page.GOTO_PAGE, gotoPage );

addChild(currentPage);
 }
 private function gotoPage( e :Event ) :void
 {
var nextPage = currentPage.gotoPage;

currentPage.removeEventListener( Page.PAGE_INIT, initPage );
currentPage.removeEventListener( Page.GOTO_PAGE, gotoPage );

var loader:Loader = Loader( e.target );
loader.unload();

loadPage( nextPage );
 }

 I'm not sure about the gotoPage method, if I can make a Loader object of
 the currentPage and unload it. Is it totally ready for the GC to be deleted?
 Thnx in advance.

 Sander
 ___
 Flashcoders mailing list
 Flashcoders@chattyfig.figleaf.com
 http://chattyfig.figleaf.com/mailman/listinfo/flashcoders





 ___
 Flashcoders mailing list
 Flashcoders@chattyfig.figleaf.com
 http://chattyfig.figleaf.com/mailman/listinfo/flashcoders



___
Flashcoders mailing list
Flashcoders@chattyfig.figleaf.com
http://chattyfig.figleaf.com/mailman/listinfo/flashcoders

[Flashcoders] Removing loaded swf...

2008-08-15 Thread Sander Schuurman 
Hi cool list!

I'm trying do build a generic structure of pages (swf's) loaded in a main swf, 
and unloading as well ofcourse.
Now I'm trying to unload a loaded swf, with the famous Garbage Collection. But 
I'm not sure I'm doing it the right way. Hope you could point me in the right 
direction.

My code:

private function loadPage( qUrl :String ) :void
{
var mLoader:Loader= new Loader();
var mRequest:URLRequest = new URLRequest( qUrl );

mLoader.contentLoaderInfo.addEventListener( Event.COMPLETE, 
pageComplete );
mLoader.load( mRequest );
}
private function pageComplete( e :Event ) :void
{
currentPage = e.currentTarget.content;

currentPage.addEventListener( Page.PAGE_INIT, initPage );
currentPage.addEventListener( Page.GOTO_PAGE, gotoPage );

addChild(currentPage);
}
private function gotoPage( e :Event ) :void
{
var nextPage = currentPage.gotoPage;

currentPage.removeEventListener( Page.PAGE_INIT, initPage );
currentPage.removeEventListener( Page.GOTO_PAGE, gotoPage );

var loader:Loader = Loader( e.target );
loader.unload();

loadPage( nextPage );
}

I'm not sure about the gotoPage method, if I can make a Loader object of the 
currentPage and unload it. Is it totally ready for the GC to be deleted?
Thnx in advance.

Sander
___
Flashcoders mailing list
Flashcoders@chattyfig.figleaf.com
http://chattyfig.figleaf.com/mailman/listinfo/flashcoders

Re: [Flashcoders] Removing loaded swf...

2008-08-15 Thread Eduardo Omine 
In gotoPage(), try this:

var loader:Loader = Loader(currentPage.parent);


instead of:

var loader:Loader = Loader(e.target); // e.target refers to currentPage


-- 
Eduardo Omine
http://blog.omine.net/
http://www.omine.net/
___
Flashcoders mailing list
Flashcoders@chattyfig.figleaf.com
http://chattyfig.figleaf.com/mailman/listinfo/flashcoders

Re: [Flashcoders] Removing loaded swf...

2008-08-15 Thread H 
Hmm, Loader.unload() only removes the content from the loader object. It
might be a good idea to remove it from the container you are adding it to.

Make sure currentPage has no listeners to objects outside of its own scope,
or objects inside of its scope listening to anything out of its scope, or
objects outside of its scope referencing anything inside of its scope, and
all streams closed when you unload. Always clean up timers and enterframe
listeners from the swf being loaded. It is a good idea to have a deinit()
like method that you call for clean up. I think you're okay if you're
cleanly in general :)

Here is a nice article about System.gc(), it might be helpful:
http://www.craftymind.com/2008/04/09/kick-starting-the-garbage-collector-in-actionscript-3-with-air/

And if you haven't already, check this out:
http://www.gskinner.com/blog/archives/2008/04/failure_to_unlo.html

H

On Fri, Aug 15, 2008 at 7:41 AM, Sander Schuurman 
[EMAIL PROTECTED] wrote:

 Hi cool list!

 I'm trying do build a generic structure of pages (swf's) loaded in a main
 swf, and unloading as well ofcourse.
 Now I'm trying to unload a loaded swf, with the famous Garbage Collection.
 But I'm not sure I'm doing it the right way. Hope you could point me in the
 right direction.

 My code:

 private function loadPage( qUrl :String ) :void
 {
var mLoader:Loader= new Loader();
var mRequest:URLRequest = new URLRequest( qUrl );

mLoader.contentLoaderInfo.addEventListener( Event.COMPLETE,
 pageComplete );
mLoader.load( mRequest );
 }
 private function pageComplete( e :Event ) :void
 {
currentPage = e.currentTarget.content;

 currentPage.addEventListener( Page.PAGE_INIT, initPage );
currentPage.addEventListener( Page.GOTO_PAGE, gotoPage );

addChild(currentPage);
 }
 private function gotoPage( e :Event ) :void
 {
var nextPage = currentPage.gotoPage;

currentPage.removeEventListener( Page.PAGE_INIT, initPage );
currentPage.removeEventListener( Page.GOTO_PAGE, gotoPage );

var loader:Loader = Loader( e.target );
loader.unload();

loadPage( nextPage );
 }

 I'm not sure about the gotoPage method, if I can make a Loader object of
 the currentPage and unload it. Is it totally ready for the GC to be deleted?
 Thnx in advance.

 Sander
 ___
 Flashcoders mailing list
 Flashcoders@chattyfig.figleaf.com
 http://chattyfig.figleaf.com/mailman/listinfo/flashcoders

___
Flashcoders mailing list
Flashcoders@chattyfig.figleaf.com
http://chattyfig.figleaf.com/mailman/listinfo/flashcoders

Re: [Flashcoders] Removing loaded swf...

2008-08-15 Thread dr.ache 

Hi Sander.

When you add an EventListener you should in 99% set the weak reference 
flag like this:


mLoader.contentLoaderInfo.addEventListener( Event.COMPLETE, 
pageComplete,false,0,true );

The last parameter - here set to true - makes the reference to your 
pageComplete function
weak. Meaning if this reference is the only reference left to your removed 
object that object
becomes ready for garbage collection. Have a look in the as3 language reference 
to learn more about it.

Mark



Sander Schuurman schrieb:

Hi cool list!

I'm trying do build a generic structure of pages (swf's) loaded in a main swf, 
and unloading as well ofcourse.
Now I'm trying to unload a loaded swf, with the famous Garbage Collection. But 
I'm not sure I'm doing it the right way. Hope you could point me in the right 
direction.

My code:

private function loadPage( qUrl :String ) :void
{
var mLoader:Loader= new Loader();
var mRequest:URLRequest = new URLRequest( qUrl );

mLoader.contentLoaderInfo.addEventListener( Event.COMPLETE, 
pageComplete );
mLoader.load( mRequest );
}
private function pageComplete( e :Event ) :void
{
currentPage = e.currentTarget.content;

currentPage.addEventListener( Page.PAGE_INIT, initPage );
currentPage.addEventListener( Page.GOTO_PAGE, gotoPage );

addChild(currentPage);
}
private function gotoPage( e :Event ) :void
{
var nextPage = currentPage.gotoPage;

currentPage.removeEventListener( Page.PAGE_INIT, initPage );
currentPage.removeEventListener( Page.GOTO_PAGE, gotoPage );

var loader:Loader = Loader( e.target );
loader.unload();

loadPage( nextPage );
}

I'm not sure about the gotoPage method, if I can make a Loader object of the 
currentPage and unload it. Is it totally ready for the GC to be deleted?
Thnx in advance.

Sander
___
Flashcoders mailing list
Flashcoders@chattyfig.figleaf.com
http://chattyfig.figleaf.com/mailman/listinfo/flashcoders


  


___
Flashcoders mailing list
Flashcoders@chattyfig.figleaf.com
http://chattyfig.figleaf.com/mailman/listinfo/flashcoders

Re: [Flashcoders] Removing loaded swf...

2008-08-15 Thread Hans Wichman 
Hi,

I thought the point of Grant's article was that it's hopelessly bugged in
player 9 even if you are an academic?:)

greetz
JC



On Fri, Aug 15, 2008 at 3:47 PM, Eduardo Omine [EMAIL PROTECTED]wrote:

 In gotoPage(), try this:

 var loader:Loader = Loader(currentPage.parent);


 instead of:

 var loader:Loader = Loader(e.target); // e.target refers to currentPage


 --
 Eduardo Omine
 http://blog.omine.net/
 http://www.omine.net/
  ___
 Flashcoders mailing list
 Flashcoders@chattyfig.figleaf.com
 http://chattyfig.figleaf.com/mailman/listinfo/flashcoders

___
Flashcoders mailing list
Flashcoders@chattyfig.figleaf.com
http://chattyfig.figleaf.com/mailman/listinfo/flashcoders

Re: [Flashcoders] Removing loaded swf...

2008-08-15 Thread H 
It is a bit like that isn't it :)

H

On Fri, Aug 15, 2008 at 9:13 AM, Hans Wichman 
[EMAIL PROTECTED] wrote:

 Hi,

 I thought the point of Grant's article was that it's hopelessly bugged in
 player 9 even if you are an academic?:)

 greetz
 JC



 On Fri, Aug 15, 2008 at 3:47 PM, Eduardo Omine [EMAIL PROTECTED]
 wrote:

  In gotoPage(), try this:
 
  var loader:Loader = Loader(currentPage.parent);
 
 
  instead of:
 
  var loader:Loader = Loader(e.target); // e.target refers to currentPage
 
 
  --
  Eduardo Omine
  http://blog.omine.net/
  http://www.omine.net/
   ___
  Flashcoders mailing list
  Flashcoders@chattyfig.figleaf.com
  http://chattyfig.figleaf.com/mailman/listinfo/flashcoders
 
 ___
 Flashcoders mailing list
 Flashcoders@chattyfig.figleaf.com
 http://chattyfig.figleaf.com/mailman/listinfo/flashcoders

___
Flashcoders mailing list
Flashcoders@chattyfig.figleaf.com
http://chattyfig.figleaf.com/mailman/listinfo/flashcoders