Those are used internally within Sum and its expected that users instead call Sum.integersPerKey, or Sum.doublesPerKey, or Sum.integersGlobally, or ... The Combine.java example specifically calls out using Sum.SumIntegerFn instead of calling Sum.integersPerKey.
I filed https://issues.apache.org/jira/browse/BEAM-1208 to address the visibility of Sum.[*]Fn instances. On Thu, Dec 22, 2016 at 3:07 AM, Stas Levin <stasle...@gmail.com> wrote: > Hi all, > > I was wondering if there was a reason Sum.SumDoubleFn, SumIntegerFn and > SumLongFn are not using the X.of() or X.from() or other instance creation > via static method patterns that are so common in Beam? > > For example: > > new Sum.SumLongFn() > > vs. > > SumFn.ofLong() > > > Regards, > Stas >
