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| import { Dispatcher } from 'flux' | |
| function isPromise(obj) { | |
| return obj && (typeof obj === 'object' || typeof obj === 'function') && | |
| typeof obj.then === 'function' | |
| } | |
| const inject = Math.random().toString(16).substr(2, 7) | |
| class Alt { | |
| constructor(options = {}) { | |
| this.dispatcher = new options.Dispatcher() | |
| this.serialize = options.serialize || JSON.stringify | |
| this.deserialize = options.deserialize || JSON.parse | |
| this.actions = {} | |
| this.stores = {} | |
| this.history = options.history || 2 | |
| this.payloads = [] | |
| this.state = this.serialize({}) | |
| } | |
| createActions(namespace, model) { | |
| this.actions[namespace] = Object.keys(model).reduce((actions, name) => { | |
| const action = (...args) => { | |
| const data = model[name](...args) | |
| const meta = { namespace, name, args } | |
| if (isPromise(data)) { | |
| data | |
| .then(x => this.dispatcher.dispatch({ action, data: x, meta })) | |
| .catch(e => this.dispatcher.dispatch({ action: null, data: e, meta })) | |
| } else { | |
| this.dispatcher.dispatch({ action, data, meta }) | |
| } | |
| } | |
| actions[name] = action | |
| return actions | |
| }, {}) | |
| return this.actions[namespace] | |
| } | |
| createStore(namespace, reducer, initialState, ...args) { | |
| const subscriptions = [] | |
| let state = initialState | |
| this.payloads[namespace] = [] | |
| // save the state to app level state | |
| const saveState = state => { | |
| const appState = this.deserialize(this.state) | |
| appState[namespace] = state | |
| this.state = this.serialize(appState) | |
| if (this.payloads.length - 1 < this.history) { | |
| this.payloads[namespace].push(state) | |
| } | |
| } | |
| // dispatch event | |
| this.dispatcher.register((payload) => { | |
| state = reducer(state, payload, ...args) | |
| subscriptions.forEach(f => f(state)) | |
| }) | |
| // our store | |
| const store = { | |
| name: namespace, | |
| subscribe: (onChange) => { | |
| const id = subscriptions.push(onChange) | |
| return () => subscriptions.splice(id, 1) | |
| }, | |
| peek: (n = 1) => { | |
| const payloads = this.payloads[namespace] | |
| return payloads[payloads.length - n - 1] | |
| }, | |
| [inject]: newState => saveState(state = newState) | |
| } | |
| // save the initial state | |
| saveState(initialState) | |
| // make it available | |
| this.stores[namespace] = store | |
| // listener to save state locally for history | |
| store.subscribe(saveState) | |
| return store | |
| } | |
| takeSnapshot() { | |
| return this.state | |
| } | |
| bootstrap(serializedData) { | |
| const data = this.deserialize(serializedData) | |
| Object.keys(data).forEach((name) => { | |
| this.stores[name][inject](data[name]) | |
| }) | |
| } | |
| prepare(store, payload) { | |
| return this.serialize({ | |
| [store.name]: payload | |
| }) | |
| } | |
| recycle() { | |
| Object.keys(this.stores).forEach((name) => { | |
| this.stores[name][inject](this.payloads[name][0]) | |
| }) | |
| } | |
| flush() { | |
| const snapshot = this.takeSnapshot() | |
| this.recycle() | |
| return snapshot | |
| } | |
| } | |
| import assign from 'object-assign' | |
| const alt = new Alt({ Dispatcher, history: 300 }) | |
| // The name is for | |
| // A) to reference this later | |
| // B) DispatcherRecorder and logging | |
| const actions = alt.createActions('Actions', { | |
| fire(x) { | |
| return x | |
| }, | |
| blah() { } | |
| }) | |
| console.log('Actions =>', actions) | |
| const store = alt.createStore('MyStore', (state, { action, data, meta }) => { | |
| return assign({}, state, { | |
| b: data | |
| }) | |
| }, { | |
| a: 0, | |
| b: 0 | |
| }) | |
| console.log('Store =>', store) | |
| console.log('Snapshot 1, 3', alt.takeSnapshot()) | |
| store.subscribe((state) => { | |
| console.log('* Change Event:', state) | |
| }) | |
| actions.fire(1) | |
| actions.fire(2) | |
| actions.fire(3) | |
| actions.fire(4) | |
| console.log('PEEKING 0, 1', store.peek(3)) | |
| const newState = store.peek(3) // 0, 1 | |
| const serialized = alt.prepare(store, newState) // MyStore: { a: 0, b: 1 } | |
| alt.bootstrap(serialized) | |
| console.log('Snapshot 0, 1', alt.takeSnapshot()) |
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