spork-state
Thread-safe state management with one implementation for both Spork and Python.
The first release provides Atom: a mutable reference whose updates are synchronized, validated before commit, and observable through synchronous watches. The implementation lives in Spork; the Python package is a thin, typed facade over its compiled output.
Install
Python projects:
python -m pip install spork-state
Spork projects add the package to spork.it and synchronize the project environment:
:dependencies ["spork-state>=0.1,<0.2"]
spork sync
spork-state supports Python 3.10–3.14, including free-threaded 3.14.
Python API
from spork_state import Atom
counter = Atom(0, validator=lambda value: value >= 0)
unsubscribe = counter.subscribe(
lambda old, new: print(f"{old} -> {new}"),
fire_immediately=True,
)
counter.swap(lambda value, amount: value + amount, 3)
assert counter.value == 3
assert counter.compare_and_set(counter.value, 4)
unsubscribe()
Functional equivalents (atom, deref, swap, reset, and others) are also exported.
Spork API
(ns example.counter
(:require [spork-state.core :as state]))
(def counter (state.atom 0 (fn [value] (>= value 0))))
(state.add-watch! counter :log
(fn [key reference old-value new-value]
(print old-value "->" new-value)))
(state.swap! counter (fn [value amount] (+ value amount)) 3)
(assert (= (state.deref counter) 3))
The core Spork functions are atom, atom?, deref, swap!, swap-vals!, reset!, reset-vals!, compare-and-set!, add-watch!, remove-watch!, get-validator, and set-validator!.
Guarantees
swap,reset, validator replacement, and compare-and-set are linearizable.- A swap function runs exactly once while the atom's reentrant lock is held.
- Validators run before commit. Rejection leaves the old value unchanged.
- Watches run synchronously after commit, outside the lock, in registration order.
- A watch exception propagates but never rolls back committed state.
- Compare-and-set and change notification use object identity, not equality.
- Reading an atom is safe; mutating a mutable value obtained from it is not synchronized. Prefer immutable values.
See the API reference and design semantics for concurrency details.
Development
Requires spork-lang 0.3.5 or newer:
spork sync --dev
spork test
mypy tests/typing/usage.py
spork dist --clean
python -m twine check dist/*
License
MIT
1 maintainer
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