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  1. #1

    Command Mode - ADD items in particular order to client

    Hi,

    I am noticing that in single Level Command Mode adapter publish , the Add items are not received in same order as published to ItemEventListener.

    Am i missing something here,

    say my data Adapter does data retrieval and pushes data in order as shown
    1.
    ItemEventListener.smartUpdate(objectHandle, ITEM-A-VALUE-MAP ,true);
    2. ItemEventListener.smartUpdate(objectHandle, ITEM-B-VALUE-MAP ,true);
    3. ItemEventListener.smartUpdate(objectHandle, ITEM-C-VALUE-MAP ,true);

    When Client subscribes the ItemUpdates are received in some random order, is there a way to ensure the items are received back in same published order.

    Thanks
    Rajesh

  2. #2
    Administrator
    Join Date
    Feb 2012
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    Hi Rajesh,

    You could leverage this configuration, in lightstreamer_conf.xml:

    <!-- Optional. Configuration of the update management for items subscribed to
    in COMMAND mode with unfiltered dispatching, with regard to updates
    pertaining to different keys.
    Can be one of the following:
    - Y: the order in which updates are received from the Data Adapter is
    preserved when sending updates to the clients; in this case, any
    frequency limits imposed by license limitations are applied
    to the whole item and may result in a very slow update flow;
    this was the default behavior before Server 4.0 version.
    - N: provided that no updates are lost, the Server can send enqueued
    updates in whichever order; it must only ensure that, for updates
    pertaining to the same key, the order in which updates are received
    from the Data Adapter is preserved; in this case, any frequency
    limits imposed by license limitations are applied for each
    key independently.
    No item-level choice is possible. However, setting this flag as Y
    allows for backward compatibility to versions before 4.0, if needed.
    Default: N. -->
    <preserve_unfiltered_command_ordering>Y</preserve_unfiltered_command_ordering>


    But please let me stress out some warnings:
    • - the COMMAND mode Items have to be subscribed with the unfilterd dispatching setting (https://lightstreamer.com/docs/clien...edMaxFrequency);
    • - this is a global setting, that means the apply to all the COMMAND mode Items handled by the server;
    • - in the case of global frequency limit, for example those imposed by some license types, apply for the whole Item and no longer for the individual keys. This could lead to a noticeable deterioration in performance.


    Regards,
    Giuseppe

 

 

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