in demo-apps/demo-kda-app/src/main/java/com/amazonaws/services/kinesisanalytics/operators/CountWindowFn.java [18:27]
public void apply(Tuple tuple,
TimeWindow timeWindow,
Iterable<EmployeeInfo> iterable,
Collector<Tuple2<Long, Long>> collector) throws Exception {
long count = Iterables.size(iterable);
EmployeeInfo employeeInfo = Iterables.get(iterable, 0);
collector.collect(new Tuple2<>(employeeInfo.getCompanyid(), count));
}