mapping ActionScript and Java objects

ernivan

Hi

I read the article on http://cometdaily.com/2010/03/07/hello-world-for-flex-amf-with-lightstreamer/

support lightstreamer remote object mapping ?

here is the doc on blazeDS:
http://livedocs.adobe.com/blazeds/1/blazeds_devguide/help.html?content=serialize_data_3.html

thanks

Mone

hi,

is there a difference between what is shown in the blog post an what you're expecting?

You can send any java bean from Lightstreamer server to Flex client. Do you mean something different?

ernivan

AS3 allow to mapping actionscript objects to java objects with tag [remoteClass] tag in ActionScript so the conversion data type is automatic.

http://sujitreddyg.wordpress.com/2008/01/16/mapping-action-script-objects-to-java-objects/

support lightstreamer remote object mapping ?

thanks

Mone

no, the RemoteObject is not supported, you can only receive AMF objects as fields on an item.

also the automatic casting is not supported; if you need to have the received object as an instance of a defined class you can write a wrapper instead.
e.g.: a simple wrapper for the bean of our hello world example will look like this:
[SYNTAX="JS"]package
{

public class FlexHelloBean
{
private var obj:*;

public function FlexHelloBean(obj:*) {
this.obj = obj;
}

public function get hello():String {
return this.obj.hello;
}

public function get now(): Date {
return this.obj.now;
}

}
}[/SYNTAX]

and you'll use it like this:

[SYNTAX="JS"]var bean:FlexHelloBean = new FlexHelloBean(evt.getFieldValue("AMF_field"));
myTextArea.text = dateFormatter.format(bean.now) + " " + bean.hello;[/SYNTAX]

HTH

ernivan

thanks :Smile_Ab:

another questios , use lightstreamer Long polling or Streaming polling ?

http://en.wikipedia.org/wiki/Long_polling#Long_polling

thanks

Mone

Lightstreamer can use both;
by default it uses streaming btw if the infrastructure blocks the streaming (e.g.: a proxy that blocks the http streaming between the client and the server) it falls back to long polling.

ernivan

is there a problem on update data if there is a proxy between server and client in http streaming ?

is it possible to use only to long polling ?

thanks

Mone

it's not like any proxy will block the http streaming, and not like only proxies can block it;

there are proxies that can block streaming, but also firewalls antiviruses and virtually anything between the server and the client processes.
In any case, in our experience in production environments only a small percentage of users need to switch to polling due to issues in the network.

That said you can explicitly set clients to use long polling but this will only offer a worse service to those clients that would be able to use streaming (as said, most of them) and will higher the load on the server as long polling pose a heavier load on it.

explicitly configure clients to start in long polling mode is discouraged unless your application is sandboxed in an environment where you now that streaming is not feasible (and even in this case a better approach would be to try to remove the streaming-stopper).

ernivan

if I send 100 kb from server to client every 3 seconds for a total of 30 mb , stream connection (alway open) consume more bandwidth of the long polling ?

ernivan

Ciao

Have you any test Network of Consuming Bandwidth between AMF binary protocol and XML, JSON, etc. ?

thanks

Mone

if I send 100 kb from server to client every 3 seconds for a total of 30 mb , stream connection (alway open) consume more bandwidth of the long polling ?

long polling will have a bigger overhead (as more http requests are sent over the wire) so it will use more bandwith

ernivan

is there a Stock-List demo made in flax- AMF online ?

Mone

the only AMF example is the one in the HelloWorld tutorial on CometDaily

Mone

on the other hand a non-AMF flex StockListDemo is available here: http://www.lightstreamer.com/demo/Flex_StockListDemo/ (you can find the sources in the Lightstreamer distribution)

ernivan

thanks for all your responses :Smile_Ab: