Integrating with a J2EE Application Server

[CitiMan]

Following on this same subject, I would like a search form that once served by the application server, posts it's form data to a Lightstreamer DataAdapter. I am not sure at present how to communicate this form data (even as query string) to the lightstreamer server, nor do I know how to access a query string from the data adapter.

Is this possible?

thanks

[Alessandro]

Do you mean anything similar to the RoundTrip Demo or anything else?

In the RoundTrip Demo the data written in the form is sent to a servlet, that publishes it on a JMS bus (provided by JBoss App Server). The LS Data Adapter implements a JMS subscriber that receives the data and injects it into Lightstreamer Kernel, that in turns delivers it to the Clients that have subscribed to that item.

So the flow is:

browser form --> servlet --> JMS --> LS Data Adapter / LS Kernel --> browsers

This is a flesible approach, because in a clustered environment more instances of Lightstreamer Server can receive the client contribution through JMS.

For simpler scenarios, Lightstreamer offers the sendMessage() method to directly deliver any data to the Metadata Adapter (that can pass it to the Data Adapter).

[CitiMan]

regarding the sendMessage() js function, can you post some sample server side code that shows how this message is intercepted and passed to the DataAdapter?

thanks

[Mone]

Hi,

Sorry, but actually I don't have any piece of code using the sendMessage.
You have to implement MetadataProvider's notifyUserMessage to intercept user's messages.
To pass the message received from the MetaDataApadter to the DataAdapter there isn't a fixed way.
You can for (very simple) example save the refrence of your DataAdapter instance in a static variable and then access that static variable from the MetaDataAdapter to pass the message.

Hope that helps.
Mone.

[Mone]

I've moved the discussion about the comunication between Adapters here:
http://www.lightstreamer.com/vb/showthread.php?p=125