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From manuzhang <...@git.apache.org>
Subject [GitHub] incubator-gearpump issue #85: [GEARPUMP-23] add window dsl
Date Wed, 28 Sep 2016 01:03:59 GMT
Github user manuzhang commented on the issue:

    https://github.com/apache/incubator-gearpump/pull/85
  
    @kkasravi 
    
    `stream.groupBy` is now a shortcut for `stream.window(CountWindow.apply(1).triggering(CountTrigger).accumulating).groupBy`.
    
    so `groupBy` has windowing semantics and all window operations should follow `groupBy`
    
    here is the window semantics
    
    ```
    - Window
        - WindowFn 
             -> SlidingWindowFn // FixedWindow and SlidingWindow 
             -> CountWindowFn  // CountWindow
        - Trigger
             -> EventTimeTrigger  // event time aggregation
             -> ProcessingTimeTrigger  // processing time aggregation
             -> CountTrigger // count aggregation, used with CountWindowFn
         - AccumulationMode
             -> Accumulating   // states are accumulated across windows
             -> Discarding  // states are not accumulated  
    ```


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