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From "Dale LaBossiere (JIRA)" <j...@apache.org>
Subject [jira] [Created] (QUARKS-230) Add timer triggered window aggregations
Date Fri, 15 Jul 2016 15:12:20 GMT
Dale LaBossiere created QUARKS-230:
--------------------------------------

             Summary: Add timer triggered window aggregations
                 Key: QUARKS-230
                 URL: https://issues.apache.org/jira/browse/QUARKS-230
             Project: Quarks
          Issue Type: New Feature
            Reporter: Dale LaBossiere
            Assignee: Dale LaBossiere


A recent use case involved the desire for "timer triggered" instead of "partition content
change triggered" window aggregations.  E.g., "I want to trigger an aggregation every second
over the last 10 tuples in a window partition" -- a count-based window with timer triggered
aggregations.

I propose adding 3 methods to TWindow.  Two in direct support of "timer triggered" aggregations
(this processing model seems like it could be common enough to warrant making it conveniently
available) and one to make it easier to use the lower level Window API to define and use other
processing models.

I'm submitting a PR with the details for review but the net is these additions to TWindow:

```
    <U> TStream<U> timedAggregate(long period, TimeUnit unit, BiFunction<List<T>,
K, U> aggregator);
    <U> TStream<U> timedBatch(long period, TimeUnit unit, BiFunction<List<T>,
K, U> batcher);
    <U, L extends List<T>> TStream<U> process(Window<T,K,L> window,
BiFunction<List<T>, K, U> aggregator);
```



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