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in-package search v0.1.0
This module implements bandwidth counters based on (cumulative) exponential moving average. Each counter is identified by an integer. They are stored in an internal hash table.
See i.e. https://en.wikipedia.org/wiki/Moving_average#Exponential_moving_average for the algorithm.
val fresh_state : id:string -> refresh_interval:float -> state
fresh_state ~id ~refresh_interval initializes the state of a worker handling a family of counter. The worker wakes up every
id is a string identifier used for distinguishing distinct Moving_average workers..
create state ~init ~alpha is a counter with initial value
init and factor
alpha. The counter is added to the
state. It is not removed automatically: it must be removed manually.
val add : t -> int -> unit
add state t v adds
v to the counter
val on_update : state -> (unit -> unit) -> unit
on_update state f registers
f to be called on each update of the internal worker associated to
val updated : state -> unit Lwt_condition.t
updated state is a condition variable that gets signaled on each update of the internal worker..