auto-update

Efficiently run periodic, on-demand actions

https://github.com/yesodweb/wai

Version on this page:0.1.4.1
LTS Haskell 24.28:0.2.6
Stackage Nightly 2026-01-14:0.2.6
Latest on Hackage:0.2.6

See all snapshots auto-update appears in

MIT licensed by Michael Snoyman
Maintained by [email protected]
This version can be pinned in stack with:auto-update-0.1.4.1@sha256:4361715d6a145a9d06eac261714f5e12399879440bdcd5815a0205da4b2defab,1219

Module documentation for 0.1.4.1

  • Control
    • Control.AutoUpdate
    • Control.Debounce
    • Control.Reaper
Depends on 1 package(full list with versions):
base
Used by 7 packages in nightly-2019-06-05(full list with versions):
datadog, dns, fast-logger, katip, tls-session-manager, warp, yesod-core

auto-update

A common problem is the desire to have an action run at a scheduled interval, but only if it is needed. For example, instead of having every web request result in a new getCurrentTime call, we’d like to have a single worker thread run every second, updating an IORef. However, if the request frequency is less than once per second, this is a pessimization, and worse, kills idle GC.

This library allows you to define actions which will either be performed by a dedicated thread or, in times of low volume, will be executed by the calling thread.

For original use case, see yesod-scaffold issue #15.

Changes

ChangeLog for auto-update

0.1.4.1

  • #693: Improve documentation for reaperAction function.
  • #732: Fixed memory leak in reaperAdd function.

0.1.4

  • Provide updateActionModify API in AutoUpdate #547

0.1.3.1

  • Doc improvements

0.1.3

  • Adding a new AIP - reaperKill

0.1.2

  • Added Control.Debounce