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Query about AIDL

Discussion in 'Android Development' started by Estgobi, Apr 18, 2012.

  1. Estgobi

    Estgobi Lurker
    Thread Starter

    Hi All,

    If I want to communicate between the process , then I need to use AIDL.
    while using AIDL , It is creating Binder thread in my process.I want to know why this thread is needed as communication between the process in Synchronous ?

    I am really want to know, why IPC call is Synchronous, why not Asynchronous?
    as it is designed as Synchronous , it will affect the performance .

    Check out the timestamp and pid in below logs

    04-19 08:23:21.575: INFO/MainActivity(332): mRemoteService.StartTimer calling st
    04-19 08:23:21.575: INFO/Timer Service(323): StartTimer-Binder Thread #2
    04-19 08:23:21.685: INFO/MainActivity(332): mRemoteService.StartTimer called

    please correct me if I am wrong

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  2. alostpacket

    alostpacket Over Macho Grande?

    My guess would be it's almost certainly async. Just seems logical but I don't know for sure.
  3. wubbzy

    wubbzy Well-Known Member

    The answer actually lies in your own question - *IDL concept is borrowed from RPC or other remote method/function execution frameworks. The reason to choose IDL can vary, but they provide one important thing - they are and behave similar (including syntactically) to local function/method call. Just like a local method/function call does not return until it has completed neither does IDL or RPC.

    That being said android tries to manage read/write ends to IDL sides (activity/service combo). So it can tell them when other disconnected or connected, so one end does not wait (recv) and other does not keep sending (return) - simple remote exception handling situation.

    Consider if you really need remote service. If you just have one 'process' (maybe many activities tied to it), then you can simplify this a lot by using local service.
    alostpacket likes this.

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