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Erlang stats collection and distributed tracing framework

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opencensus src oc_stat_aggregation.erl
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src/oc_stat_aggregation.erl 

-module(oc_stat_aggregation).



-export_types(data/0).



-type data_rows(AggregationValue) :: [#{tags := oc_tags:tags(),

                                        value := AggregationValue}].



-type data(Type, AggregationValue) :: #{type := Type,

                                        rows := data_rows(AggregationValue)}.



-type data() :: data(latest, number())

              | data(count, number())

              | data(sum, #{count := non_neg_integer(),

                            mean := number(),

                            sum := number()})

              | data(distribution, #{count := non_neg_integer(),

                                     mean := number(),

                                     sum := number(),

                                     buckets := [{number, non_neg_integer()}]}).



-type keys()  :: [oc_tags:key()].



-callback init(oc_stat_view:name(), keys(), any()) -> any().



-callback type() -> latest | count | sum | distribution.



-callback add_sample(oc_stat_view:name(), oc_tags:tags(), number(), any()) -> ok.



-callback export(oc_stat_view:name(), any()) -> data().