How does flex keep track of changes?

[*Ludwig*]

I'm a bit confused about the RIA part of flex. Let's say I wanted to have a
stock quote app at work. All stock quote data was being retrieved from a web
service. How does the data then become dynamic when displayed? Meaning the
data I'm displaying is only as accurate as the last time I made a request to
the web service. Unless I automated my app to check for any changes every
minute, it would not reflect the changes as they were made. Perhaps a web
service is not the best way to develop this type of app, I'm just starting to
investigate the possibilities of Flex, but was wondering if anyone out there
could perhaps explain to me how Flex handles this. Thanks.

[Dave Wolf]

Nearly every implementation of 'server push' is really client pull.
Some peope do the pull asa you say by polling. Another design is to use
a blocking client request, that the server hangs on, and returns control
when the 'event' fires. This is sometimes known as the blocking
registration pattern.

In any case, yes, its always client pull. However Flex has some neat
API's for doing nicer designs like blocking registration.

Weve done many 'server push' architectures with many products in the
past this way.

Dave Wolf
Cynergy Systems
[url]http://www.cynergysystems.com[/url]

*Ludwig* wrote:

> I'm a bit confused about the RIA part of flex. Let's say I wanted to have a
> stock quote app at work. All stock quote data was being retrieved from a web
> service. How does the data then become dynamic when displayed? Meaning the
> data I'm displaying is only as accurate as the last time I made a request to
> the web service. Unless I automated my app to check for any changes every
> minute, it would not reflect the changes as they were made. Perhaps a web
> service is not the best way to develop this type of app, I'm just starting to
> investigate the possibilities of Flex, but was wondering if anyone out there
> could perhaps explain to me how Flex handles this. Thanks.
>

[Carson Hager]

To add on to what Dave has said, MM does offer more of a true server push
through the Flash Communication Server but it does require an additional
license and I'm not familiar with the pricing model.


Carson

________________________________

Carson Hager
Cynergy Systems, Inc.
[url]http://www.cynergysystems.com[/url]


"Dave Wolf" <dave.wolf@cynergysystems.com_nospam> wrote in message
news:cv2g6u$duh$1@forums.macromedia.com...

> Nearly every implementation of 'server push' is really client pull. Some
> peope do the pull asa you say by polling. Another design is to use a
> blocking client request, that the server hangs on, and returns control
> when the 'event' fires. This is sometimes known as the blocking
> registration pattern.
>
> In any case, yes, its always client pull. However Flex has some neat
> API's for doing nicer designs like blocking registration.
>
> Weve done many 'server push' architectures with many products in the past
> this way.
>
> Dave Wolf
> Cynergy Systems
> [url]http://www.cynergysystems.com[/url]
>
> *Ludwig* wrote:

>> I'm a bit confused about the RIA part of flex. Let's say I wanted to
>> have a stock quote app at work. All stock quote data was being retrieved
>> from a web service. How does the data then become dynamic when
>> displayed? Meaning the data I'm displaying is only as accurate as the
>> last time I made a request to the web service. Unless I automated my app
>> to check for any changes every minute, it would not reflect the changes
>> as they were made. Perhaps a web service is not the best way to develop
>> this type of app, I'm just starting to investigate the possibilities of
>> Flex, but was wondering if anyone out there could perhaps explain to me
>> how Flex handles this. Thanks.
>>