package async_kernel

  1. Overview
  2. Docs
Module type
Class type

Implements an async aware throttling rate limiter on top of Limiter.

All forms of enqueue_exn and enqueue' below will raise if the requested job is not possible to run within the resource limitations given to the related create_exn.

If any enqueued job raises then the exception will be raised to the monitor in scope when enqueue_exn is called. Deferred jobs passed to enqueue' return Raised (in a deferred manner) instead.

Jobs are always executed in FIFO order.

module Outcome : sig ... end

The outcome of a job

type t
val sexp_of_t : t -> Ppx_sexp_conv_lib.Sexp.t
type limiter = t
val sexp_of_limiter : limiter -> Ppx_sexp_conv_lib.Sexp.t
Specialized limiters

A collection of limiters, specialized to different use-cases, all supporting a shared subset of their interface

module type Common = sig ... end
module Token_bucket : sig ... end

Throttle, Sequencer, and Resource_throttle re-implement the functionality available in the core Async.Throttle module with the hope that these implementations can eventually supplant that code. It is helpful to use these modules in systems that can afford to do a bit more testing so that we can get feedback on the behavior of the new implementation. They are intended to be mostly drop-in replacements.

module Throttle : sig ... end

Implements a basic throttle meant to bound the number of jobs that can concurrently run. Additionally the ~burst_size and ~sustained_rate_per_sec arguments can be used to control how many jobs can be spawned in a burst, and how quickly jobs can be spawned over time. If these options are not given to create_exn they are unbounded.

module Sequencer : sig ... end

A sequencer is a throttle that is specialized to only allow one job at a time and to, by default, not continue on error.

module Resource_throttle : sig ... end

A resource throttle holds a static list of n resources that are handed out in a round-robin fashion to up to n concurrent jobs. A resource given to create may be re-used many times in the lifetime of t but will never be used by more than one job at a time.

module Expert : sig ... end