rs-store

A thread-safe Redux-style state management library implemented in Rust.

Overview

rs-store provides a predictable state container inspired by Redux, featuring thread-safe state management with support for reducers, subscribers, and async actions through Thunk. Unlike traditional Redux, rs-store's reducers can produce side effects, providing more flexibility in state management.

Features

• 🔒 Thread-safe state management
• 📢 Publisher/Subscriber pattern for state changes
• 🔄 Support for asynchronous operations via Thunk actions
• 📊 Side effect handling in reducers
• 📊 Middleware handles actions and effects
• 📊 Backpressure handling with configurable policies
• 🔄 Droppable store
• 🎯 Bounded channel size with sync channels
• 🔄 Decoupling state updates from notification delivery
• 📚 State Iterator support
• 📚 Selector support
• 📊 Metrics support
• 🧪 Comprehensive test coverage

Installation

Add this to your Cargo.toml:

[dependencies]
rs-store = "1.1"

with the notify-channel feature:

[dependencies]
rs-store = { version = "1.1", features = ["notify-channel"] }

Quick Start

use std::sync::Arc;
use rs_store::{DispatchOp, Dispatcher, FnReducer, FnSubscriber, StoreBuilder};

pub fn main() {
    // new store with reducer
    let store = StoreBuilder::new(0)
        .with_reducer(Box::new(FnReducer::from(|state: &i32, action: &i32| {
            println!("reducer: {} + {}", state, action);
            DispatchOp::Dispatch(state + action, None)
        })))
        .build()
        .unwrap();

    // add subscriber
    store.add_subscriber(Arc::new(FnSubscriber::from(|state: &i32, _action: &i32| {
        println!("subscriber: state: {}", state);
    })));

    // dispatch actions
    store.dispatch(41);
    store.dispatch(1);

    // stop the store
    store.stop();

    assert_eq!(store.get_state(), 42);
}

Feature Details

Backpressure feature

Backpressure is a feature that allows you to control the rate of state updates. and it also can be used to prevent slow subscribers from blocking state updates.

Side Effects in Reducers

Unlike traditional Redux implementations, rs-store allows reducers to produce side effects directly. This means reducers can produce asynchronous operations.

Middleware

Middleware is a powerful feature that allows you to intercept and modify actions before they reach the reducer, or to handle side effects, logging, metrics, etc.

Notification Channel

The notification channel feature provides a dedicated channel for state notifications to subscribers, separating the concerns of state updates and notification delivery.

State Iterator

You can subscribe to a Store to get the state history, But the state iterator feature provides a way to iterate over the state.

Selector

The selector feature provides a way to select a part of the state.

Metrics

The metrics feature provides a way to collect metrics.

Documentation

For detailed documentation, visit:

• API Documentation (docs.rs)
• Crate Page (crates.io)

Implementation Status

In Progress 🚧

• Latest state notification for new subscribers
• Notification scheduler (CurrentThread, ThreadPool)
• Stream-based pull model(Iterator)
• Stop store after all effects are scheduled
• Separate state interface and implementation
• drop store after all references are dropped

Contributing

Contributions are welcome! Please feel free to submit a Pull Request.

License

This project is licensed under the MIT License - see the LICENSE file for details.