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42 lines
1.3 KiB
42 lines
1.3 KiB
2 years ago
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var Class = require('./Class');
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var clone = require('./clone');
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var remove = require('./remove');
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exports = Class({
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initialize: function ReduceStore(reducer, initialState) {
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this._reducer = reducer;
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this._state = initialState;
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this._curListeners = [];
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this._nextListeners = this._curListeners;
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},
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subscribe: function(listener) {
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var isSubscribed = true;
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this._ensureCanMutateNextListeners();
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this._nextListeners.push(listener);
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var self = this;
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return function() {
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if (!isSubscribed) return;
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isSubscribed = false;
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self._ensureCanMutateNextListeners();
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remove(self._nextListeners, function(val) {
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return val === listener;
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});
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};
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},
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dispatch: function(action) {
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this._state = this._reducer(this._state, action);
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var listeners = (this._curListeners = this._nextListeners);
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for (var i = 0, len = listeners.length; i < len; i++) listeners[i]();
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return action;
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},
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getState: function() {
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return this._state;
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},
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_ensureCanMutateNextListeners: function() {
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if (this._nextListeners === this._curListeners) {
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this._nextListeners = clone(this._curListeners);
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}
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}
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});
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module.exports = exports;
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