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https://github.com/inamiy/reactiveautomaton

🤖 ReactiveCocoa + State Machine, inspired by Redux and Elm.
https://github.com/inamiy/reactiveautomaton

automaton elm reactivecocoa redux state-machine swift

Last synced: 4 months ago
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🤖 ReactiveCocoa + State Machine, inspired by Redux and Elm.

Host: GitHub
URL: https://github.com/inamiy/reactiveautomaton
Owner: inamiy
License: mit
Archived: true
Created: 2016-05-06T19:39:20.000Z (over 8 years ago)
Default Branch: swift/5.0
Last Pushed: 2021-12-12T05:05:45.000Z (about 3 years ago)
Last Synced: 2024-09-25T22:43:37.212Z (4 months ago)
Topics: automaton, elm, reactivecocoa, redux, state-machine, swift
Language: Swift
Homepage:
Size: 293 KB
Stars: 207
Watchers: 7
Forks: 6
Open Issues: 0
Metadata Files:
- Readme: README.md
- License: LICENSE

Awesome Lists containing this project

README

        ## NOTE: This repository has been discontinued in favor of [Actomaton](https://github.com/inamiy/Actomaton).

# ReactiveAutomaton

[ReactiveCocoa](https://github.com/ReactiveCocoa/ReactiveCocoa) + State Machine, inspired by [Redux](https://github.com/reactjs/redux) and [Elm](http://elm-lang.org/). A successor of [SwiftState](https://github.com/ReactKit/SwiftState).

## Example

(Demo app is available at [ReactiveCocoaCatalog](https://github.com/inamiy/ReactiveCocoaCatalog))

![](Assets/login-diagram.png)

To make a state transition diagram like above _with additional effects_, follow these steps:

```swift

// 1. Define `State`s and `Input`s.

enum State {

    case loggedOut, loggingIn, loggedIn, loggingOut

}

enum Input {

    case login, loginOK, logout, logoutOK

    case forceLogout

}

// Additional effects (`SignalProducer`s) while state-transitioning.

// (NOTE: Use `SignalProducer.empty` for no effect)

let loginOKProducer = /* show UI, setup DB, request APIs, ..., and send `Input.loginOK` */

let logoutOKProducer = /* show UI, clear cache, cancel APIs, ..., and send `Input.logoutOK` */

let forceLogoutOKProducer = /* do something more special, ..., and send `Input.logoutOK` */

let canForceLogout: (State) -> Bool = [.loggingIn, .loggedIn].contains

// 2. Setup state-transition mappings.

let mappings: [Automaton.EffectMapping] = [

  /*  Input   |   fromState => toState     |      Effect       */

  /* ----------------------------------------------------------*/

    .login    | .loggedOut  => .loggingIn  | loginOKProducer,

    .loginOK  | .loggingIn  => .loggedIn   | .empty,

    .logout   | .loggedIn   => .loggingOut | logoutOKProducer,

    .logoutOK | .loggingOut => .loggedOut  | .empty,

    .forceLogout | canForceLogout => .loggingOut | forceLogoutOKProducer

]

// 3. Prepare input pipe for sending `Input` to `Automaton`.

let (inputSignal, inputObserver) = Signal.pipe()

// 4. Setup `Automaton`.

let automaton = Automaton(

    state: .loggedOut,

    input: inputSignal,

    mapping: reduce(mappings),  // combine mappings using `reduce` helper

    strategy: .latest   // NOTE: `.latest` cancels previous running effect

)

// Observe state-transition replies (`.success` or `.failure`).

automaton.replies.observeNext { reply in

    print("received reply = \(reply)")

}

// Observe current state changes.

automaton.state.producer.startWithValues { state in

    print("current state = \(state)")

}

```

And let's test!

```swift

let send = inputObserver.send(value:)

expect(automaton.state.value) == .loggedIn    // already logged in

send(Input.logout)

expect(automaton.state.value) == .loggingOut  // logging out...

// `logoutOKProducer` will automatically send `Input.logoutOK` later

// and transit to `State.loggedOut`.

expect(automaton.state.value) == .loggedOut   // already logged out

send(Input.login)

expect(automaton.state.value) == .loggingIn   // logging in...

// `loginOKProducer` will automatically send `Input.loginOK` later

// and transit to `State.loggedIn`.

// 👨🏽 < But wait, there's more!

// Let's send `Input.forceLogout` immediately after `State.loggingIn`.

send(Input.forceLogout)                       // 💥💣💥

expect(automaton.state.value) == .loggingOut  // logging out...

// `forceLogoutOKProducer` will automatically send `Input.logoutOK` later

// and transit to `State.loggedOut`.

```

Note that **any sizes of `State` and `Input` will work using `ReactiveAutomaton`**, from single state (like above example) to covering whole app's states (like React.js + Redux architecture).

## References

1. [iOSDC 2016 (Tokyo, in Japanese)](https://iosdc.jp/2016/) (2016/08/20)

    - [iOSDC Japan 2016 08/20 Track A / Reactive State Machine / 稲見 泰宏 - YouTube](https://www.youtube.com/watch?v=Yvz9H9AWGFM) (video)

    - [Reactive State Machine (Japanese) // Speaker Deck](https://speakerdeck.com/inamiy/reactive-state-machine-japanese) (slide)

2. [iOSConf SG (Singapore, in English)](http://iosconf.sg/) (2016/10/20-21)

    - [Reactive State Machine - iOS Conf SG 2016 - YouTube](https://www.youtube.com/watch?v=Oau4JjJP3nA) (video)

    - [Reactive State Machine // Speaker Deck](https://speakerdeck.com/inamiy/reactive-state-machine-1) (slide)

## License

[MIT](LICENSE)