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A Haskell library that simplifies access to remote data, such as databases or web-based services.
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Haxl
example Fix haxl core tests Apr 10, 2019
tests
.gitignore Make haxl compile cleanly with stack build --pedantic Oct 5, 2016
.travis.yml
CODE_OF_CONDUCT.md Adopt Contributor Covenant Aug 30, 2019
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LICENSE Update haxl copyright headers Mar 11, 2015
Setup.hs Initial open source import Jun 10, 2014
changelog.md Fix documentation Sep 20, 2019
haxl.cabal Add ParallelTests to .cabal file (facebook#104) Nov 29, 2019
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readme.md

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Haxl

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Haxl is a Haskell library that simplifies access to remote data, such as databases or web-based services. Haxl can automatically

  • batch multiple requests to the same data source,
  • request data from multiple data sources concurrently,
  • cache previous requests,
  • memoize computations.

Having all this handled for you behind the scenes means that your data-fetching code can be much cleaner and clearer than it would otherwise be if it had to worry about optimizing data-fetching. We'll give some examples of how this works in the pages linked below.

There are two Haskell packages here:

To use Haxl in your own application, you will likely need to build one or more data sources: the thin layer between Haxl and the data that you want to fetch, be it a database, a web API, a cloud service, or whatever.

There is a generic datasource in "Haxl.DataSource.ConcurrentIO" that can be used for performing arbitrary IO operations concurrently, given a bit of boilerplate to define the IO operations you want to perform.

The haxl-facebook package shows how we might build a Haxl data source based on the existing fb package for talking to the Facebook Graph API.

Where to go next?

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