Kdux

Android + Kotlin + Redux = :heart:

Installation

Add the JitPack repository to your root build.gradle at the end of repositories:

allprojects {
    repositories {
        ...
        maven { url 'https://jitpack.io' }
    }
}

Add the dependency:

dependencies {
    implementation 'com.github.htdangkhoa:kdux:<latest_version>'
}

Usage

State:

data class CounterState(val number: Int = 0): State

Action:

sealed class CounterAction: Action {
    object INCREASE: CounterAction()
    object DECREASE: CounterAction()
    companion object {
        fun increaseAction(dispatch: Dispatch) = dispatch(INCREASE)
        fun decreaseAction(dispatch: Dispatch) = dispatch(DECREASE)
    }
}

Reducer:

class CounterReducer: Reducer<CounterState> {
    override fun reduce(state: CounterState, action: Action): CounterState {
        return when (action) {
            CounterAction.INCREASE -> state.copy(number = state.number + 1)
            CounterAction.DECREASE -> state.copy(number = state.number - 1)
            else -> state
        }
    }
}

Activity:

class CounterActivity: AppCompatActivity(), Enhancer<CounterState> {
    private val store: Store<CounterState> by lazy {
        Store(
            CounterReducer(),
            CounterState()
            // applyMiddleware(...)
        )
    }
    override fun onCreate(savedInstanceState: Bundle?) {
        super.onCreate(savedInstanceState)
        setContentView(R.layout.activity_counter)
        btnIncrease.setOnClickListener {
            CounterAction.increaseAction { store.dispatch(it) }
        }
        btnDecrease.setOnClickListener {
            CounterAction.decreaseAction { store.dispatch(it) }
        }
    }
    override fun onStart() {
        super.onStart()
        store.subscribe(this)
    }
    override fun onStop() {
        super.onStop()
        store.unsubscribe(this)
    }
    override fun enhance(state: CounterState) {
        txtNumber.text = "${state.number}"
    }
}

Middleware: (List middlewares)

class DemoMiddleware<S: State>: Middleware<S> {
    override fun onBeforeDispatch(store: Store<S>, action: Action) {
        // Doing somthings...
    }
    override fun onDispatch(store: Store<S>, action: Action, next: Dispatcher) {
        // Doing somthings...
        next.dispatch(action)
    }
    override fun onAfterDispatch(store: Store<S>, action: Action) {
        // Doing somthings...
    }
}

Examples

Bonus

Thunk:

// Action
sealed class CounterAction: Action {
    object INCREASE: CounterAction()
    object DECREASE: CounterAction()
    companion object {
        fun increaseAction(): Action = KduxThunkAction(object: Thunk {
            override fun invoke(dispatcher: Dispatcher, state: State) {
                dispatcher.dispatch(INCREASE)
            }
        })
        fun decreaseAction(): Action = KduxThunkAction(object: Thunk {
            override fun invoke(dispatcher: Dispatcher, state: State) {
                dispatcher.dispatch(DECREASE)
            }
        })
    }
}
// Store
private val store = Store(
    ...,
    applyMiddleware(KduxThunk())
)
store.dispatch(increaseAction())
store.dispatch(decreaseAction())

Logger:

private val store: Store<CounterState> by lazy {
    Store(
        ...,
        applyMiddleware(KduxLogger())
    )
}

Debounce:

private val store: Store<CounterState> by lazy {
    Store(
        ...,
        applyMiddleware(KduxDebounce(debounce = 500)) // Range of debounce from 0 to 30000.
    )
}

DevTools:

private val store: Store<CounterState> by lazy {
    composeWithDevTools(
        Store(
            ...,
            // applyMiddleware(...)
        )
    )
}
// UNDO
store.dispatch(KduxDevToolAction.UNDO)
// REDO
store.dispatch(KduxDevToolAction.REDO)
// RESET
store.dispatch(KduxDevToolAction.RESET)

License

MIT License
Copyright (c) 2019 Huỳnh Trần Đăng Khoa
Permission is hereby granted, free of charge, to any person obtaining a copy
of this software and associated documentation files (the "Software"), to deal
in the Software without restriction, including without limitation the rights
to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
copies of the Software, and to permit persons to whom the Software is
furnished to do so, subject to the following conditions:
The above copyright notice and this permission notice shall be included in all
copies or substantial portions of the Software.
THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
SOFTWARE.