armor alternatives and similar packages
Based on the "Data" category.
Alternatively, view armor alternatives based on common mentions on social networks and blogs.
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lens
Lenses, Folds, and Traversals - Join us on web.libera.chat #haskell-lens -
semantic-source
Parsing, analyzing, and comparing source code across many languages -
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text
Haskell library for space- and time-efficient operations over Unicode text. -
code-builder
Packages for defining APIs, running them, generating client code and documentation. -
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compendium-client
Mu (μ) is a purely functional framework for building micro services. -
cassava
A CSV parsing and encoding library optimized for ease of use and high performance -
holmes
A reference library for constraint-solving with propagators and CDCL. -
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resource-pool
A high-performance striped resource pooling implementation for Haskell -
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primitive
This package provides various primitive memory-related operations. -
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discrimination
Fast linear time sorting and discrimination for a large class of data types -
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reflection
Reifies arbitrary Haskell terms into types that can be reflected back into terms -
IORefCAS
A collection of different packages for CAS based data structures. -
dependent-map
Dependently-typed finite maps (partial dependent products) -
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dependent-sum
Dependent sums and supporting typeclasses for comparing and displaying them -
orgmode-parse
Attoparsec parser combinators for parsing org-mode structured text! -
scientific
Arbitrary-precision floating-point numbers represented using scientific notation -
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streaming
An optimized general monad transformer for streaming applications, with a simple prelude of functions -
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text-icu
This package provides the Haskell Data.Text.ICU library, for performing complex manipulation of Unicode text. -
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Access the most powerful time series database as a service
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README
Armor
Armor yourself against backwards-incompatible serializations once and for all.
Motivation
As almost everyone with significant experience managing production software systems knows, backwards compatibility is incredibly important for any data that is persisted by an application. If you make a change to a data structure that is not backwards compatible with the existing serialized formats, your app will break as soon as it encounters the existing format. Even if you have 100% test coverage, your tests still might not catch this problem because it's not a problem with your app at any single point in time, but a problem with how your app evolves over time.
More subtly, if you deploy a backwards incompatible migration, your app may persist some data in the new format before it crashes on the old format. This can leave your system in the horrible state where not only will it not work with the new code, but rolling back to the old code will also break because the old code doesn't support the new serialized format! You have two incomptable serializations active at the same time!
Proper migration systems can reduce the chances of this problem occurring, but
if your system has any kind of queueing system or message bus, your migrations
might not be applied to in-flight messages. Clearly we need something to help us
protect against this problem. Enter armor.
For an overview of how to use this package, check out the [literate Haskell tutorial in the test suite](test/AppA.lhs).
Credits
Inspiration for this package came from Soostone's safecopy-hunit package.
Details were refined in production at Formation (previously Takt).