Server-Push

[ciwee_ufrj]

I read somewhere that Flex Data Services provides Server-Push
functionality. That is, the server starts a conversation with the
client. It's obvious that, In order to such thing ocurr, there has
to be a persistent connection between server and client.



I've being reading about Data Management Service to learn how
to implement this Server-Push and all I see is about a method
called Fill() that is thriggered from the client and syncronizes
it's data with the server. But it's not server-push



Does it really exist?

[aBill]

Hi,



When you create a DataService and fill your collection. The
collection becomes managed. You don't have to call fill again if
there is any change in the data. Server pushs updates to clients
when the client's dataservice is using rtmp channel. It is a live
connection between the server and the client. For example,

you fill(collection, "hqsql", from products where price <
100). If one of the product's price increases, server push a
message to your collection to remove it. If a product's product's
price decrease, it will be added to the collection. The push is
happened based on your fill method.



William Chan

[ciwee_ufrj]

You made it clearer now Bill, thx!. So I'll keep studying how
I'll do this. See ya!

[marcel_panse]

How does this rtmp channel work? I mean it isn't http based?
Is there a open port directly to some server-side code or
something?



The problem i have is when there is a rtmp message request
send for data from the server, it isn't going through any of the
servlets, so it isn't captured by Spring/Java which does all the
security through the servlets and the HttpSession (session scoped
proxy bean from spring2.0) .



This session scoped bean isn't available from a FDS call
because it isn't session scoped...



I don't think there is a solution to this? Configure the rmtp
as a spring bean maybe?

[ciwee_ufrj]

RMTP is a persistent connection so it cant be HTTP. And yes
it works in a different port. If you take a look at
services-config.xml file in the /WEB-INF/flex/ from the sample
applications that come with Flex Data Services you will see the
channel configurations available. Search for them for better
understanding.

[marcel_panse]

Thnx a lot.. ill think of another solution for our security
model. I have enough info :-)