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Posted to commits@heron.apache.org by GitBox <gi...@apache.org> on 2018/12/14 18:16:40 UTC

[GitHub] nwangtw commented on issue #3124: Nwang/fix streamwindowoperator generic types

nwangtw commented on issue #3124: Nwang/fix streamwindowoperator generic types
URL: https://github.com/apache/incubator-heron/pull/3124#issuecomment-447408749
 
 
   > Looks like the semantics for `T` and `R` go against the ones used in Java function types, say, [BiFunction](https://docs.oracle.com/javase/8/docs/api/java/util/function/BiFunction.html) where `T` is considered the input type and `R` as the result type.
   
   Yeah. For some reason R is the default generic type in Streamlet API. Like https://github.com/apache/incubator-heron/blob/5ee2490c025c7684c097962cf6d25f54ead73cf4/heron/api/src/java/org/apache/heron/streamlet/impl/streamlets/SupplierStreamlet.java
   
   I can update all of them if we decide to do so.

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