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  1. #1
    Member
    Join Date
    Mar 2009
    Location
    Madrid
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    16

    Difference between createEngine and seekEngine

    hi,
    I've read the documentation and i have a doubt with createEngine and seekEngine.

    I understand that createEngine works in the same way that seekEngine if already exists a master push-page with SHARE_SESSION especified in the creation of the engine , isn't it?

    I explain it:
    In every page I have, i use createEngine with SHARE_SESSION flag.

    - the first page i load create the engine instance --> MASTER PUSH-PAGE
    - in another window, i load another page that try to create the engine again , but doesn`t do it because the engine already exists --> this page use the current Engine instance --> PUSH-PAGE

    In the second page, should I use seekEngine instead of createEngine?

  2. #2
    Administrator
    Join Date
    Jul 2006
    Location
    Milan
    Posts
    975
    You understand correctly,
    so you can use "createEngine" with SHARE_SESSION in all your pages.
    In fact, if your site is based on SHARE_SESSION, there is no need for "seekEngine".
    Just note that all pages that call "createEngine" must define the "onEngineCreation" callback exactly in the same way and using "seekEngine" releaves you from this burden.

    On the other hand, if your main page calls "createEngine" and specifies NEW_SESSION or FAIL instead of SHARE_SESSION as the "onSimilarEngineFound" argument,
    then all other pages have to use "seekEngine" (here is the docs link, for other readers).
    The latter policy may be needed if multiple instances of the main page can be opened but they can't share the same engine (for example, in case each instance of the main page allows the user to set a bandwidth constraint).

    The use of the SHARE_SESSION flag allows Lightstreamer library to provide the "Engine Migration" feature, to recover the closing of the main window. This also does not depend on the use of "createEngine" or "seekEngine" on the other pages.

  3. #3
    Member
    Join Date
    Mar 2009
    Location
    Madrid
    Posts
    16
    ok,
    thank you very much for the explanation.

 

 

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