[flexcoders] Re: cairngorm Events and data payloads
Hi,
The delegate function thinks you just have a CairngormEvent. I think
you just need to check to make sure the event you received is your
custom event type and then cast it.
so:
if (eventHere is LoadScorecardEvent)
{
del.getScorecard( LoadScorecardEvent(eventHere).scorecardId );
}
else
{
// do nothing, or raise error, or log warning, or whatever.
}
best of luck,
Thunder
--- In flexcoders@yahoogroups.com, Douglas Knudsen
[EMAIL PROTECTED] wrote:
can someone point me to a example of how to pass data in a cairngorm
type
event? I'm trying the below with
package com.mycompany.events
{
import com.adobe.cairngorm.control.CairngormEvent;
public class LoadScorecardEvent extends CairngormEvent
{
public static var EVENT_LOAD_SCORECARD: String =
'LoadScorecardEvent';
public var scorecardId:Number;
/**
* The constructor,
*/
public function LoadScorecardEvent( )
{
super( EVENT_LOAD_SCORECARD );
}
}
}
then in a view dispatching like so
var devent : LoadScorecardEvent = new LoadScorecardEvent( );
devent.scorecardId = 5;
CairngormEventDispatcher.getInstance().dispatchEvent(
devent );
and in the command I have
public function execute( eventHere : CairngormEvent ) : void
{
var del : MainDelegate = new MainDelegate( this );
del.getScorecard( eventHere.scorecardId );
}
But this bombs out with a error about scorecardId not in eventHere.
DK
--
Douglas Knudsen
http://www.cubicleman.com
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Re: [flexcoders] Re: cairngorm Events and data payloads
ah, righto. thanks d00ds. I had this hacked up too much...no worky good. If only I can get that damn RO to calm down now and do what its told! but that's another thread.DK
On 7/27/06, thunderstumpgesatwork [EMAIL PROTECTED] wrote:
Hi,The delegate function thinks you just have a CairngormEvent. I thinkyou just need to check to make sure the event you received is yourcustom event type and then cast it.so:if (eventHere is LoadScorecardEvent)
{del.getScorecard( LoadScorecardEvent(eventHere).scorecardId );}else{// do nothing, or raise error, or log warning, or whatever.}best of luck,Thunder--- In
flexcoders@yahoogroups.com, Douglas Knudsen[EMAIL PROTECTED] wrote: can someone point me to a example of how to pass data in a cairngormtype event?I'm trying the below with
package com.mycompany.events { import com.adobe.cairngorm.control.CairngormEvent; public class LoadScorecardEvent extends CairngormEvent { public static var EVENT_LOAD_SCORECARD: String =
'LoadScorecardEvent';public var scorecardId:Number; /*** The constructor,*/ public function LoadScorecardEvent( ) {
super( EVENT_LOAD_SCORECARD ); } } } then in a view dispatching like so var devent : LoadScorecardEvent = new LoadScorecardEvent();
devent.scorecardId = 5;CairngormEventDispatcher.getInstance().dispatchEvent( devent ); and in the command I have public function execute( eventHere : CairngormEvent ) : void
{ var del : MainDelegate = new MainDelegate( this ); del.getScorecard( eventHere.scorecardId );} But this bombs out with a error about scorecardId not in eventHere.
DK -- Douglas Knudsen http://www.cubicleman.com this is my signature, like it?
--Flexcoders Mailing ListFAQ: http://groups.yahoo.com/group/flexcoders/files/flexcodersFAQ.txtSearch Archives:
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* To unsubscribe from this group, send an email to:[EMAIL PROTECTED]* Your use of Yahoo! Groups is subject to:
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Re: [flexcoders] Re: cairngorm Events and data payloads
Its really a pity, that we loose all the nice type information while going all the way through Cairngorm.
Cheers,
Ralf. On 7/27/06, Douglas Knudsen [EMAIL PROTECTED] wrote:
ah, righto. thanks d00ds. I had this hacked up too
much...no worky good. If only I can get that damn RO to
calm down now and do what its told! but that's another thread.DK
On 7/27/06, thunderstumpgesatwork
[EMAIL PROTECTED] wrote:
Hi,The delegate function thinks you just have a CairngormEvent. I thinkyou just need to check to make sure the event you received is yourcustom event type and then cast it.so:if (eventHere is LoadScorecardEvent)
{del.getScorecard( LoadScorecardEvent(eventHere).scorecardId );}else{// do nothing, or raise error, or log warning, or whatever.}best of luck,Thunder--- In
flexcoders@yahoogroups.com, Douglas Knudsen[EMAIL PROTECTED] wrote: can someone point me to a example of how to pass data in a cairngormtype event?I'm trying the below with
package com.mycompany.events { import com.adobe.cairngorm.control.CairngormEvent; public class LoadScorecardEvent extends CairngormEvent { public static var EVENT_LOAD_SCORECARD: String =
'LoadScorecardEvent';public var scorecardId:Number; /*** The constructor,*/ public function LoadScorecardEvent( ) {
super( EVENT_LOAD_SCORECARD ); } } } then in a view dispatching like so var devent : LoadScorecardEvent = new LoadScorecardEvent();
devent.scorecardId = 5;CairngormEventDispatcher.getInstance().dispatchEvent( devent ); and in the command I have public function execute( eventHere : CairngormEvent ) : void
{ var del : MainDelegate = new MainDelegate( this ); del.getScorecard( eventHere.scorecardId );} But this bombs out with a error about scorecardId not in eventHere.
DK -- Douglas Knudsen
http://www.cubicleman.com this is my signature, like it?
--Flexcoders Mailing ListFAQ:
http://groups.yahoo.com/group/flexcoders/files/flexcodersFAQ.txtSearch Archives:
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-- Douglas Knudsenhttp://www.cubicleman.com
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-- Ralf Bokelberg [EMAIL PROTECTED]Flex Flash Consultant based in Cologne/Germany
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Re: [flexcoders] Re: cairngorm Events and data payloads
I'm with you. I've been determing type of
event based on the event.type in the Command's execute method to get my
strong-typing back.
- Original Message -
From: Ralf
Bokelberg
To: flexcoders@yahoogroups.com
Sent: Thursday, July 27, 2006 12:58 PM
Subject: Re: [flexcoders] Re: cairngorm Events and data
payloads
Its really a pity, that we loose all the nice type information
while going all the way through Cairngorm. Cheers,Ralf.
On 7/27/06, Douglas
Knudsen [EMAIL PROTECTED]
wrote:
ah, righto. thanks d00ds. I had this hacked up too much...no
worky good. If only I can get that damn RO to calm down now and do
what its told! but that's another thread.
DK
On 7/27/06, thunderstumpgesatwork
[EMAIL PROTECTED] wrote:
Hi,The
delegate function thinks you just have a CairngormEvent. I thinkyou just
need to check to make sure the event you received is yourcustom event
type and then cast it.so:if (eventHere is
LoadScorecardEvent) {del.getScorecard(
LoadScorecardEvent(eventHere).scorecardId
);}else{// do nothing, or raise
error, or log warning, or whatever.}best of
luck,Thunder--- In flexcoders@yahoogroups.com, "Douglas
Knudsen"[EMAIL PROTECTED] wrote: can someone
point me to a example of how to pass data in a cairngormtype
event?I'm trying the below with package
com.mycompany.events { import
com.adobe.cairngorm.control.CairngormEvent;
public class LoadScorecardEvent extends
CairngormEvent
{ public static var
EVENT_LOAD_SCORECARD: String =
'LoadScorecardEvent';public
var
scorecardId:Number;
/*** The
constructor,*/
public function LoadScorecardEvent(
) {
super( EVENT_LOAD_SCORECARD
);
} }
} then in a view dispatching like so var devent :
LoadScorecardEvent = new LoadScorecardEvent();
devent.scorecardId =
5;CairngormEventDispatcher.getInstance().dispatchEvent(
devent ); and in the command I have public
function execute( eventHere : CairngormEvent ) : void
{
var del : MainDelegate = new MainDelegate( this
);
del.getScorecard( eventHere.scorecardId
);}
But this bombs out with a error about scorecardId not in eventHere.
DK -- Douglas
Knudsen http://www.cubicleman.com this is my signature,
like it?--Flexcoders Mailing
ListFAQ: http://groups.yahoo.com/group/flexcoders/files/flexcodersFAQ.txtSearch
Archives: http://www.mail-archive.com/flexcoders%40yahoogroups.comYahoo!
Groups Links* To visit your group on the web, go
to:
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unsubscribe from this group, send an email to:
[EMAIL PROTECTED]* Your use of
Yahoo! Groups is subject to: http://docs.yahoo.com/info/terms/-- Douglas Knudsenhttp://www.cubicleman.com
this is my signature, like it? --
Ralf Bokelberg [EMAIL PROTECTED]Flex
Flash Consultant based in Cologne/Germany
__._,_.___
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Re: [flexcoders] Re: cairngorm Events and data payloads
The only typesafe solution i can think of, is to abandon CairngormEvents and replace them by methods of the FrontController. Most of the apps i've seen so far don't make use of the runtime changeability anyways. What do we loose if we do it like that?
Cheers,Ralf. On 7/27/06, JesterXL [EMAIL PROTECTED] wrote:
I'm with you. I've been determing type of
event based on the event.type in the Command's execute method to get my
strong-typing back.
- Original Message -
From:
Ralf
Bokelberg
To: flexcoders@yahoogroups.com
Sent: Thursday, July 27, 2006 12:58 PM
Subject: Re: [flexcoders] Re: cairngorm Events and data
payloads
Its really a pity, that we loose all the nice type information
while going all the way through Cairngorm. Cheers,Ralf.
On 7/27/06, Douglas
Knudsen [EMAIL PROTECTED]
wrote:
ah, righto. thanks d00ds. I had this hacked up too much...no
worky good. If only I can get that damn RO to calm down now and do
what its told! but that's another thread.
DK
On 7/27/06, thunderstumpgesatwork
[EMAIL PROTECTED] wrote:
Hi,The
delegate function thinks you just have a CairngormEvent. I thinkyou just
need to check to make sure the event you received is yourcustom event
type and then cast it.so:if (eventHere is
LoadScorecardEvent) {del.getScorecard(
LoadScorecardEvent(eventHere).scorecardId
);}else{// do nothing, or raise
error, or log warning, or whatever.}best of
luck,Thunder--- In
flexcoders@yahoogroups.com, Douglas
Knudsen[EMAIL PROTECTED] wrote: can someone
point me to a example of how to pass data in a cairngormtype
event?I'm trying the below with package
com.mycompany.events { import
com.adobe.cairngorm.control.CairngormEvent;
public class LoadScorecardEvent extends
CairngormEvent
{ public static var
EVENT_LOAD_SCORECARD: String =
'LoadScorecardEvent';public
var
scorecardId:Number;
/*** The
constructor,*/
public function LoadScorecardEvent(
) {
super( EVENT_LOAD_SCORECARD
);
} }
} then in a view dispatching like so var devent :
LoadScorecardEvent = new LoadScorecardEvent();
devent.scorecardId =
5;CairngormEventDispatcher.getInstance().dispatchEvent(
devent ); and in the command I have public
function execute( eventHere : CairngormEvent ) : void
{
var del : MainDelegate = new MainDelegate( this
);
del.getScorecard( eventHere.scorecardId
);}
But this bombs out with a error about scorecardId not in eventHere.
DK -- Douglas
Knudsen http://www.cubicleman.com
this is my signature,
like it?--Flexcoders Mailing
ListFAQ:
http://groups.yahoo.com/group/flexcoders/files/flexcodersFAQ.txtSearch
Archives:
http://www.mail-archive.com/flexcoders%40yahoogroups.comYahoo!
Groups Links* To visit your group on the web, go
to:
http://groups.yahoo.com/group/flexcoders/ * To
unsubscribe from this group, send an email to:
[EMAIL PROTECTED]* Your use of
Yahoo! Groups is subject to:
http://docs.yahoo.com/info/terms/-- Douglas Knudsen
http://www.cubicleman.com
this is my signature, like it? --
Ralf Bokelberg [EMAIL PROTECTED]
Flex
Flash Consultant based in Cologne/Germany
-- Ralf Bokelberg [EMAIL PROTECTED]Flex Flash Consultant based in Cologne/Germany
__._,_.___
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Re: [flexcoders] Re: cairngorm Events and data payloads
Well, my events extend CairngormEvent, so I can
technically upcast 'em when they get in the Command's execute method. I
know Steven didn't really dig this idea, but if you case the type, you can
compare to the Event's constant like:
public static const EVENT_DOSOMETHING:String =
"doSomething";
function execute(event:CairngormEvent)
{
switch(event.type)
{
case
MyEvent.EVENT_DOSOMETHING:
someMethod ( MyEvent(event).someTypeSafeProp);
break;
}
}
- Original Message -
From: Ralf
Bokelberg
To: flexcoders@yahoogroups.com
Sent: Thursday, July 27, 2006 4:20 PM
Subject: Re: [flexcoders] Re: cairngorm Events and data
payloads
The only typesafe solution i can think of, is to abandon
CairngormEvents and replace them by methods of the FrontController. Most of the
apps i've seen so far don't make use of the runtime changeability anyways. What
do we loose if we do it like that? Cheers,Ralf.
On 7/27/06, JesterXL
[EMAIL PROTECTED]
wrote:
I'm with you. I've been determing type of event based on the event.type in the Command's execute method to get my
strong-typing back.
- Original Message -
From:
Ralf Bokelberg
To: flexcoders@yahoogroups.com
Sent: Thursday, July 27, 2006 12:58 PM
Subject: Re: [flexcoders] Re: cairngorm Events and data
payloads
Its really a pity, that we loose all the nice type information
while going all the way through Cairngorm. Cheers,Ralf.
On 7/27/06, Douglas
Knudsen [EMAIL PROTECTED] wrote:
ah, righto. thanks d00ds. I had this hacked up too
much...no worky good. If only I can get that damn RO to calm
down now and do what its told! but that's another thread.
DK
On 7/27/06, thunderstumpgesatwork
[EMAIL PROTECTED] wrote:
Hi,The
delegate function thinks you just have a CairngormEvent. I thinkyou
just need to check to make sure the event you received is yourcustom
event type and then cast it.so:if (eventHere is
LoadScorecardEvent) {del.getScorecard(
LoadScorecardEvent(eventHere).scorecardId
);}else{// do nothing, or raise
error, or log warning, or whatever.}best of
luck,Thunder--- In flexcoders@yahoogroups.com, "Douglas
Knudsen"[EMAIL PROTECTED] wrote: can someone
point me to a example of how to pass data in a cairngormtype
event?I'm trying the below with package
com.mycompany.events { import
com.adobe.cairngorm.control.CairngormEvent;
public class LoadScorecardEvent extends
CairngormEvent
{ public static
var EVENT_LOAD_SCORECARD: String =
'LoadScorecardEvent';public
var
scorecardId:Number;
/***
The
constructor,*/
public function LoadScorecardEvent(
) {
super( EVENT_LOAD_SCORECARD
);
} }
} then in a view dispatching like so var devent :
LoadScorecardEvent = new LoadScorecardEvent();
devent.scorecardId =
5;CairngormEventDispatcher.getInstance().dispatchEvent(
devent ); and in the command I have public
function execute( eventHere : CairngormEvent ) : void
{
var del : MainDelegate = new MainDelegate( this
);
del.getScorecard( eventHere.scorecardId
);}
But this bombs out with a error about scorecardId not in eventHere.
DK -- Douglas
Knudsen http://www.cubicleman.com this is my signature,
like it?--Flexcoders Mailing
ListFAQ: http://groups.yahoo.com/group/flexcoders/files/flexcodersFAQ.txtSearch
Archives: http://www.mail-archive.com/flexcoders%40yahoogroups.comYahoo!
Groups Links* To visit your group on the web, go
to:
http://groups.yahoo.com/group/flexcoders/ * To
unsubscribe from this group, send an email
to:
[EMAIL PROTECTED]* Your use of
Yahoo! Groups is subject to:
http://docs.yahoo.com/info/terms/-- Douglas Knudsenhttp://www.cubicleman.com
this is my signature, like it?
-- Ralf Bokelberg [EMAIL PROTECTED]
Flex Flash Consultant based in Cologne/Germany
-- Ralf Bokelberg
[EMAIL PROTECTED]Flex
Flash Consultant based in Cologne/Germany
__._,_.___
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Visit yo
[flexcoders] Re: cairngorm Events and data payloads
Forgive the dense noob here, but how is the type info lost? I thought
that by subclassing CairngormEvent you get basic checking and then you
can just do a cast or 'event as MyCutomEvent' inside the execute
method. I guess I am just not clear on what the issue is and where the
problem lies. Can someone edumacate me?
Thanks,
Ben
http://www.returnundefined.com/
--- In flexcoders@yahoogroups.com, JesterXL [EMAIL PROTECTED] wrote:
Well, my events extend CairngormEvent, so I can technically upcast
'em when they get in the Command's execute method. I know Steven
didn't really dig this idea, but if you case the type, you can compare
to the Event's constant like:
public static const EVENT_DOSOMETHING:String = doSomething;
function execute(event:CairngormEvent)
{
switch(event.type)
{
case MyEvent.EVENT_DOSOMETHING:
someMethod ( MyEvent(event).someTypeSafeProp);
break;
}
}
- Original Message -
From: Ralf Bokelberg
To: flexcoders@yahoogroups.com
Sent: Thursday, July 27, 2006 4:20 PM
Subject: Re: [flexcoders] Re: cairngorm Events and data payloads
The only typesafe solution i can think of, is to abandon
CairngormEvents and replace them by methods of the FrontController.
Most of the apps i've seen so far don't make use of the runtime
changeability anyways. What do we loose if we do it like that?
Cheers,
Ralf.
On 7/27/06, JesterXL [EMAIL PROTECTED] wrote:
I'm with you. I've been determing type of event based on the
event.type in the Command's execute method to get my strong-typing back.
- Original Message -
From: Ralf Bokelberg
To: flexcoders@yahoogroups.com
Sent: Thursday, July 27, 2006 12:58 PM
Subject: Re: [flexcoders] Re: cairngorm Events and data payloads
Its really a pity, that we loose all the nice type information
while going all the way through Cairngorm.
Cheers,
Ralf.
On 7/27/06, Douglas Knudsen [EMAIL PROTECTED] wrote:
ah, righto. thanks d00ds. I had this hacked up too much...no
worky good. If only I can get that damn RO to calm down now and do
what its told! but that's another thread.
DK
On 7/27/06, thunderstumpgesatwork [EMAIL PROTECTED] wrote:
Hi,
The delegate function thinks you just have a CairngormEvent. I
think
you just need to check to make sure the event you received is your
custom event type and then cast it.
so:
if (eventHere is LoadScorecardEvent)
{
del.getScorecard( LoadScorecardEvent(eventHere).scorecardId );
}
else
{
// do nothing, or raise error, or log warning, or whatever.
}
best of luck,
Thunder
--- In flexcoders@yahoogroups.com, Douglas Knudsen
douglasknudsen@ wrote:
can someone point me to a example of how to pass data in a
cairngorm
type
event? I'm trying the below with
package com.mycompany.events
{
import com.adobe.cairngorm.control.CairngormEvent;
public class LoadScorecardEvent extends CairngormEvent
{
public static var EVENT_LOAD_SCORECARD: String =
'LoadScorecardEvent';
public var scorecardId:Number;
/**
* The constructor,
*/
public function LoadScorecardEvent( )
{
super( EVENT_LOAD_SCORECARD );
}
}
}
then in a view dispatching like so
var devent : LoadScorecardEvent = new LoadScorecardEvent( );
devent.scorecardId = 5;
CairngormEventDispatcher.getInstance().dispatchEvent(
devent );
and in the command I have
public function execute( eventHere : CairngormEvent ) : void
{
var del : MainDelegate = new MainDelegate( this );
del.getScorecard( eventHere.scorecardId );
}
But this bombs out with a error about scorecardId not in
eventHere.
DK
--
Douglas Knudsen
http://www.cubicleman.com
this is my signature, like it?
--
Flexcoders Mailing List
FAQ:
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Yahoo! Groups Links
--
Douglas Knudsen
http://www.cubicleman.com
this is my signature, like it?
--
Ralf Bokelberg [EMAIL PROTECTED]
Flex Flash Consultant based in Cologne/Germany
--
Ralf Bokelberg [EMAIL PROTECTED]
Flex Flash Consultant based in Cologne/Germany
--
Flexcoders Mailing List
FAQ
Re: [flexcoders] Re: cairngorm Events and data payloads
My initial frustration was I'd create this event class, which allowed
strong-typing, like so:
package
{
import com.adobe.control.CairngormEvent;
public class MyEvent extends CairngormEvent
{
public static const ACTION:String = action;
public var someID:int;
public function MyEvent(p_type:String, p_someID:int)
{
super(p_type);
someID = p_someID;
}
}
}
So, my event now has context. If I need to have my Command get a person
record from the DB for example, this event will contain the payload it
needs; the person ID I'm looking for. However, by the time it gets to the
Command, it's a base class, the CairngormEvent.
package
{
public class MyCommand implements AllTheInterfacesEct
{
public function execute ( event:CairngormEvent )
{
trace(event.someID); // faith based programming
}
}
}
Now, for some, their Events are directly linked to Commands, like so:
LoginEvent will fire LoginCommand which calls LoginDelegate
GetPersonEvent will fire GetPersonCommand which calls GetPersonDelegate
At a simple level, yes, this'll do. So, you can acutally make some
assumptions in the above; if you play by the default Cairngorm rules, you
KNOW by convention that your MyCommand class will get a MyEvent, so you
could risk up-casting, like so:
someDelegateMethod ( MyEvent ( event ) . someID );
...that's faith, though. You'll get an exception if for some reason that's
not the real event. It'd be better if the compiler caught that vs. the
runtime, before it's a problem. For me, I use multiple events inside
Commands, so it's exacerbated. The Controller keeps all of this under tabs,
but again, it'd be nice if MyCommand for example GOT MyEvent in the execute.
I supposed you could make that assumption; not sure if it'd compile.
Anyway, convention over strict-typing is ok since a lot of conventions teams
follow can do the above, for example, and assume you'll get what you need.
- Original Message -
From: ben.clinkinbeard [EMAIL PROTECTED]
To: flexcoders@yahoogroups.com
Sent: Thursday, July 27, 2006 10:22 PM
Subject: [flexcoders] Re: cairngorm Events and data payloads
Forgive the dense noob here, but how is the type info lost? I thought
that by subclassing CairngormEvent you get basic checking and then you
can just do a cast or 'event as MyCutomEvent' inside the execute
method. I guess I am just not clear on what the issue is and where the
problem lies. Can someone edumacate me?
Thanks,
Ben
http://www.returnundefined.com/
--- In flexcoders@yahoogroups.com, JesterXL [EMAIL PROTECTED] wrote:
Well, my events extend CairngormEvent, so I can technically upcast
'em when they get in the Command's execute method. I know Steven
didn't really dig this idea, but if you case the type, you can compare
to the Event's constant like:
public static const EVENT_DOSOMETHING:String = doSomething;
function execute(event:CairngormEvent)
{
switch(event.type)
{
case MyEvent.EVENT_DOSOMETHING:
someMethod ( MyEvent(event).someTypeSafeProp);
break;
}
}
- Original Message -
From: Ralf Bokelberg
To: flexcoders@yahoogroups.com
Sent: Thursday, July 27, 2006 4:20 PM
Subject: Re: [flexcoders] Re: cairngorm Events and data payloads
The only typesafe solution i can think of, is to abandon
CairngormEvents and replace them by methods of the FrontController.
Most of the apps i've seen so far don't make use of the runtime
changeability anyways. What do we loose if we do it like that?
Cheers,
Ralf.
On 7/27/06, JesterXL [EMAIL PROTECTED] wrote:
I'm with you. I've been determing type of event based on the
event.type in the Command's execute method to get my strong-typing back.
- Original Message -
From: Ralf Bokelberg
To: flexcoders@yahoogroups.com
Sent: Thursday, July 27, 2006 12:58 PM
Subject: Re: [flexcoders] Re: cairngorm Events and data payloads
Its really a pity, that we loose all the nice type information
while going all the way through Cairngorm.
Cheers,
Ralf.
On 7/27/06, Douglas Knudsen [EMAIL PROTECTED] wrote:
ah, righto. thanks d00ds. I had this hacked up too much...no
worky good. If only I can get that damn RO to calm down now and do
what its told! but that's another thread.
DK
On 7/27/06, thunderstumpgesatwork [EMAIL PROTECTED] wrote:
Hi,
The delegate function thinks you just have a CairngormEvent. I
think
you just need to check to make sure the event you received is your
custom event type and then cast it.
so:
if (eventHere is LoadScorecardEvent)
{
del.getScorecard( LoadScorecardEvent(eventHere).scorecardId );
}
else
{
// do nothing, or raise error, or log warning, or whatever.
}
best of luck,
Thunder
--- In flexcoders
[flexcoders] Re: cairngorm Events and data payloads
Doesn't execute() accept a CairngromEvent for the sake of polymorphism
though? How could you do things any differently and still preserve
that aspect? Additionally, if you want your Commands to support
multiple types of events isn't it essential that execute() accept a
superclass or common interface? Are you just wishing AS supported
method overloading or is there something I am still not getting?
Thanks,
Ben
http://www.returnundefined.com/
--- In flexcoders@yahoogroups.com, JesterXL [EMAIL PROTECTED] wrote:
My initial frustration was I'd create this event class, which allowed
strong-typing, like so:
package
{
import com.adobe.control.CairngormEvent;
public class MyEvent extends CairngormEvent
{
public static const ACTION:String = action;
public var someID:int;
public function MyEvent(p_type:String, p_someID:int)
{
super(p_type);
someID = p_someID;
}
}
}
So, my event now has context. If I need to have my Command get a
person
record from the DB for example, this event will contain the payload it
needs; the person ID I'm looking for. However, by the time it gets
to the
Command, it's a base class, the CairngormEvent.
package
{
public class MyCommand implements AllTheInterfacesEct
{
public function execute ( event:CairngormEvent )
{
trace(event.someID); // faith based programming
}
}
}
Now, for some, their Events are directly linked to Commands, like so:
LoginEvent will fire LoginCommand which calls LoginDelegate
GetPersonEvent will fire GetPersonCommand which calls GetPersonDelegate
At a simple level, yes, this'll do. So, you can acutally make some
assumptions in the above; if you play by the default Cairngorm
rules, you
KNOW by convention that your MyCommand class will get a MyEvent, so you
could risk up-casting, like so:
someDelegateMethod ( MyEvent ( event ) . someID );
...that's faith, though. You'll get an exception if for some reason
that's
not the real event. It'd be better if the compiler caught that vs. the
runtime, before it's a problem. For me, I use multiple events inside
Commands, so it's exacerbated. The Controller keeps all of this
under tabs,
but again, it'd be nice if MyCommand for example GOT MyEvent in the
execute.
I supposed you could make that assumption; not sure if it'd compile.
Anyway, convention over strict-typing is ok since a lot of
conventions teams
follow can do the above, for example, and assume you'll get what you
need.
- Original Message -
From: ben.clinkinbeard [EMAIL PROTECTED]
To: flexcoders@yahoogroups.com
Sent: Thursday, July 27, 2006 10:22 PM
Subject: [flexcoders] Re: cairngorm Events and data payloads
Forgive the dense noob here, but how is the type info lost? I thought
that by subclassing CairngormEvent you get basic checking and then you
can just do a cast or 'event as MyCutomEvent' inside the execute
method. I guess I am just not clear on what the issue is and where the
problem lies. Can someone edumacate me?
Thanks,
Ben
http://www.returnundefined.com/
--- In flexcoders@yahoogroups.com, JesterXL jesterxl@ wrote:
Well, my events extend CairngormEvent, so I can technically upcast
'em when they get in the Command's execute method. I know Steven
didn't really dig this idea, but if you case the type, you can compare
to the Event's constant like:
public static const EVENT_DOSOMETHING:String = doSomething;
function execute(event:CairngormEvent)
{
switch(event.type)
{
case MyEvent.EVENT_DOSOMETHING:
someMethod ( MyEvent(event).someTypeSafeProp);
break;
}
}
- Original Message -
From: Ralf Bokelberg
To: flexcoders@yahoogroups.com
Sent: Thursday, July 27, 2006 4:20 PM
Subject: Re: [flexcoders] Re: cairngorm Events and data payloads
The only typesafe solution i can think of, is to abandon
CairngormEvents and replace them by methods of the FrontController.
Most of the apps i've seen so far don't make use of the runtime
changeability anyways. What do we loose if we do it like that?
Cheers,
Ralf.
On 7/27/06, JesterXL jesterxl@ wrote:
I'm with you. I've been determing type of event based on the
event.type in the Command's execute method to get my strong-typing back.
- Original Message -
From: Ralf Bokelberg
To: flexcoders@yahoogroups.com
Sent: Thursday, July 27, 2006 12:58 PM
Subject: Re: [flexcoders] Re: cairngorm Events and data payloads
Its really a pity, that we loose all the nice type information
while going all the way through Cairngorm.
Cheers,
Ralf.
On 7/27/06, Douglas Knudsen douglasknudsen@ wrote:
ah, righto. thanks d00ds. I had this hacked up too much...no
worky good. If only I can get that damn RO to calm down now and do
what
Re: [flexcoders] Re: cairngorm Events and data payloads
5 coffee's and 3 RedBull's later, I'm running on fumes, so don't really have
intelligent answers for you, just guesses.
Don't know, I guess you're right.
Find some way to either A) follow the convention a Command will get the
event class of a similiar name, and thus feel safe in casting it or B ) find
some way to strongly type that parameter. You can't up-cast function
arguments, though, so it's kind of stuck as CairngormEvent... I think.
For the multiple events, yes, you are correct. I've definately taken for
granted all my other stuff has worked for that very fact. Oops.
Actually, at this point, no clue... wtf were you talking about anyway,
Bokel?
- Original Message -
From: ben.clinkinbeard [EMAIL PROTECTED]
To: flexcoders@yahoogroups.com
Sent: Thursday, July 27, 2006 10:50 PM
Subject: [flexcoders] Re: cairngorm Events and data payloads
Doesn't execute() accept a CairngromEvent for the sake of polymorphism
though? How could you do things any differently and still preserve
that aspect? Additionally, if you want your Commands to support
multiple types of events isn't it essential that execute() accept a
superclass or common interface? Are you just wishing AS supported
method overloading or is there something I am still not getting?
Thanks,
Ben
http://www.returnundefined.com/
--- In flexcoders@yahoogroups.com, JesterXL [EMAIL PROTECTED] wrote:
My initial frustration was I'd create this event class, which allowed
strong-typing, like so:
package
{
import com.adobe.control.CairngormEvent;
public class MyEvent extends CairngormEvent
{
public static const ACTION:String = action;
public var someID:int;
public function MyEvent(p_type:String, p_someID:int)
{
super(p_type);
someID = p_someID;
}
}
}
So, my event now has context. If I need to have my Command get a
person
record from the DB for example, this event will contain the payload it
needs; the person ID I'm looking for. However, by the time it gets
to the
Command, it's a base class, the CairngormEvent.
package
{
public class MyCommand implements AllTheInterfacesEct
{
public function execute ( event:CairngormEvent )
{
trace(event.someID); // faith based programming
}
}
}
Now, for some, their Events are directly linked to Commands, like so:
LoginEvent will fire LoginCommand which calls LoginDelegate
GetPersonEvent will fire GetPersonCommand which calls GetPersonDelegate
At a simple level, yes, this'll do. So, you can acutally make some
assumptions in the above; if you play by the default Cairngorm
rules, you
KNOW by convention that your MyCommand class will get a MyEvent, so you
could risk up-casting, like so:
someDelegateMethod ( MyEvent ( event ) . someID );
...that's faith, though. You'll get an exception if for some reason
that's
not the real event. It'd be better if the compiler caught that vs. the
runtime, before it's a problem. For me, I use multiple events inside
Commands, so it's exacerbated. The Controller keeps all of this
under tabs,
but again, it'd be nice if MyCommand for example GOT MyEvent in the
execute.
I supposed you could make that assumption; not sure if it'd compile.
Anyway, convention over strict-typing is ok since a lot of
conventions teams
follow can do the above, for example, and assume you'll get what you
need.
- Original Message -
From: ben.clinkinbeard [EMAIL PROTECTED]
To: flexcoders@yahoogroups.com
Sent: Thursday, July 27, 2006 10:22 PM
Subject: [flexcoders] Re: cairngorm Events and data payloads
Forgive the dense noob here, but how is the type info lost? I thought
that by subclassing CairngormEvent you get basic checking and then you
can just do a cast or 'event as MyCutomEvent' inside the execute
method. I guess I am just not clear on what the issue is and where the
problem lies. Can someone edumacate me?
Thanks,
Ben
http://www.returnundefined.com/
--- In flexcoders@yahoogroups.com, JesterXL jesterxl@ wrote:
Well, my events extend CairngormEvent, so I can technically upcast
'em when they get in the Command's execute method. I know Steven
didn't really dig this idea, but if you case the type, you can compare
to the Event's constant like:
public static const EVENT_DOSOMETHING:String = doSomething;
function execute(event:CairngormEvent)
{
switch(event.type)
{
case MyEvent.EVENT_DOSOMETHING:
someMethod ( MyEvent(event).someTypeSafeProp);
break;
}
}
- Original Message -
From: Ralf Bokelberg
To: flexcoders@yahoogroups.com
Sent: Thursday, July 27, 2006 4:20 PM
Subject: Re: [flexcoders] Re: cairngorm Events and data payloads
The only typesafe solution i can think of, is to abandon
CairngormEvents and replace them by methods of the FrontController.
Most of the apps i've seen so far don't
[flexcoders] Re: cairngorm Events and data payloads
Heh, sorry dood, didn't mean to challenge you while in an
exhaustion-induced haze. I just wanted to make sure there wasn't some
basic concept quietly sailing above my head. :)
Get some sleep.
--- In flexcoders@yahoogroups.com, JesterXL [EMAIL PROTECTED] wrote:
5 coffee's and 3 RedBull's later, I'm running on fumes, so don't
really have
intelligent answers for you, just guesses.
Don't know, I guess you're right.
Find some way to either A) follow the convention a Command will get the
event class of a similiar name, and thus feel safe in casting it or
B ) find
some way to strongly type that parameter. You can't up-cast function
arguments, though, so it's kind of stuck as CairngormEvent... I think.
For the multiple events, yes, you are correct. I've definately
taken for
granted all my other stuff has worked for that very fact. Oops.
Actually, at this point, no clue... wtf were you talking about anyway,
Bokel?
- Original Message -
From: ben.clinkinbeard [EMAIL PROTECTED]
To: flexcoders@yahoogroups.com
Sent: Thursday, July 27, 2006 10:50 PM
Subject: [flexcoders] Re: cairngorm Events and data payloads
Doesn't execute() accept a CairngromEvent for the sake of polymorphism
though? How could you do things any differently and still preserve
that aspect? Additionally, if you want your Commands to support
multiple types of events isn't it essential that execute() accept a
superclass or common interface? Are you just wishing AS supported
method overloading or is there something I am still not getting?
Thanks,
Ben
http://www.returnundefined.com/
--- In flexcoders@yahoogroups.com, JesterXL jesterxl@ wrote:
My initial frustration was I'd create this event class, which allowed
strong-typing, like so:
package
{
import com.adobe.control.CairngormEvent;
public class MyEvent extends CairngormEvent
{
public static const ACTION:String = action;
public var someID:int;
public function MyEvent(p_type:String, p_someID:int)
{
super(p_type);
someID = p_someID;
}
}
}
So, my event now has context. If I need to have my Command get a
person
record from the DB for example, this event will contain the payload it
needs; the person ID I'm looking for. However, by the time it gets
to the
Command, it's a base class, the CairngormEvent.
package
{
public class MyCommand implements AllTheInterfacesEct
{
public function execute ( event:CairngormEvent )
{
trace(event.someID); // faith based programming
}
}
}
Now, for some, their Events are directly linked to Commands, like so:
LoginEvent will fire LoginCommand which calls LoginDelegate
GetPersonEvent will fire GetPersonCommand which calls
GetPersonDelegate
At a simple level, yes, this'll do. So, you can acutally make some
assumptions in the above; if you play by the default Cairngorm
rules, you
KNOW by convention that your MyCommand class will get a MyEvent,
so you
could risk up-casting, like so:
someDelegateMethod ( MyEvent ( event ) . someID );
...that's faith, though. You'll get an exception if for some reason
that's
not the real event. It'd be better if the compiler caught that
vs. the
runtime, before it's a problem. For me, I use multiple events inside
Commands, so it's exacerbated. The Controller keeps all of this
under tabs,
but again, it'd be nice if MyCommand for example GOT MyEvent in the
execute.
I supposed you could make that assumption; not sure if it'd compile.
Anyway, convention over strict-typing is ok since a lot of
conventions teams
follow can do the above, for example, and assume you'll get what you
need.
- Original Message -
From: ben.clinkinbeard ben.clinkinbeard@
To: flexcoders@yahoogroups.com
Sent: Thursday, July 27, 2006 10:22 PM
Subject: [flexcoders] Re: cairngorm Events and data payloads
Forgive the dense noob here, but how is the type info lost? I thought
that by subclassing CairngormEvent you get basic checking and then you
can just do a cast or 'event as MyCutomEvent' inside the execute
method. I guess I am just not clear on what the issue is and where the
problem lies. Can someone edumacate me?
Thanks,
Ben
http://www.returnundefined.com/
--- In flexcoders@yahoogroups.com, JesterXL jesterxl@ wrote:
Well, my events extend CairngormEvent, so I can technically upcast
'em when they get in the Command's execute method. I know Steven
didn't really dig this idea, but if you case the type, you can compare
to the Event's constant like:
public static const EVENT_DOSOMETHING:String = doSomething;
function execute(event:CairngormEvent)
{
switch(event.type)
{
case MyEvent.EVENT_DOSOMETHING:
someMethod ( MyEvent(event).someTypeSafeProp
