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  1. #1
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    Send data back using LS

    It could have been explained before but I have to ask this again:
    Is it possbile to send some data back to the server (data adapter) from the client page?
    If yes, any samples available?

    Thanks for help.

  2. #2
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    Hi Mark,

    Currently you cannot talk directly to the Data Adapter from the client, but you can talk to the Metadata Adapter, through the sendMessage method. The Metadata Adapter will receive a call to notifyUserMessage. Then, the Metadata Adapter could talk to the Data Adapter.

    Consider that for enterprise applications, you will probably have a cluster of Lightstreamer Servers and you may want to leverage a server-side middleware (e.g. JMS) to dispatch messages to all your Data Adapters. In this case, you will probably deliver messages from the client to a typical web server component (e.g. a servlet), which will publish the data to the messaging bus. And the Data Adapters will listen to this bus.

  3. #3
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    Does that require Java backend?
    I am running .Net data Adapter though. Will it work then? If yes, could you please show some sample code?

    Thanks

  4. #4
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    The simple technique (i.e. sendMessage + notifyUserMessage + Metadata/Data Adapter communication) is also available with Remote .NET Data Adapters.
    You should code your Metadata Adapter as a Remote .NET Adapter too ("NotifyUserMessage" is still provided by the .NET library interface).
    Then you can have your Remote Metadata and Data Adapter talk to each other quite easily by loading them in the same Remote Server instance. This is shown in DOCS-SDKs\sdk_adapter_dotnet; see chapter 1.6 in doc\DotNet Adapters.pdf. The sample code shows loading both adapters, though communication between them is not covered.

    The full technique (i.e. an intermediate servlet and a message bus) is entirely played outside Lightstreamer. We use it in the PortfolioDemo; see http://www.lightstreamer.com/portfolioDemo.htm, where some raw code is available for the java case.

  5. #5
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    But isn't sendMessage a server side method?
    How am I triggering it from the client (Browser)?

    Thanks

  6. #6
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    No, sorry for the confusion; I have now fixed my previous post.
    sendMessage is provided by the Web Client Library as a method of the LightstreamerEngine object
    http://www.lightstreamer.com/docs/cl...ml#sendMessage
    A call to sendMessage by your client triggers, on the server side, the invocation of the notifyUserMessage method on your Metadata Adapter; this is supported both for java adapters and (as NotifyUserMessage) for remote .NET adapters.

 

 

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