Question

我试图了解如何解决商店之间的依赖关系。问题是我有一个全面的数据树，需要从服务器获取一个相互依赖的请求链。

问题： waitFor接缝不应该用于异步请求。假设下一个事件链：

NEED_A（查看StoreA）
NEED_B（查看StoreB）此处StoreB执行AppDispatcher.waitFor([StoreA.dispatchToken])。但实际上我们想要等待GET_A
SOME_OTHER_ACTION（查看StoreA）

自waitFor调用StoreA.dispatchToken以来的第二步，第三步中断了SOME_OTHER_ACTION。

问题： 等待某些特定操作（GET_A）的真实方式是什么？

让我们来看看代码（请注意三条PROBLEM条评论）：

StoreA

var a = [];

var StoreA = assign({}, EventEmitter.prototype, {

   getAProps: () => copyOfAProps(a);

   asyncGetA: () => ... //Async request returns Promise
});

StoreA.dispatchToken = AppDispatcher.register((action) => {

  switch(action.type) {
     NEED_A:
       StoreA.asyncGetA().then((data) => {             
         ActionCreator.getA(data); //Dispatches GET_A event
       });
       break;
     GET_A: 
       a = action.data;
       StoreA.emitChange();
     SOME_OTHER_ACTION: 
       //do whatever
  }

});

StoreB

var b = [];

var StoreB = assign({}, EventEmitter.prototype, {

   // PROBLEM: this request depends on data fetched from StoreA.asyncGetA
   asyncGetB: (A) => ...
});

StoreB.dispatchToken = AppDispatcher.register((action) => {

  switch(action.type) {
    //PROBLEM: NEED_B may happen before GET_A
    NEED_B:
      //PROBLEM: As I understand waitFor doesn't work here
      AppDispatcher.waitFor([StoreA.dispatchToken]);
      StoreB.asyncGetB(StoreA.getAProps()).then((data) => {
        ActionCreator.getB(data);
      });
    GET_B:
      b = action.data;
      StoreB.emitChange();
  }
});

Answer 1

以下是来自https://github.com/calitek/ReactPatterns React.13 / ReFluxWebSocket的示例。 App.js触发Api.Store对ws.api.js执行的操作。然后ws.api.js触发Api.Store作出反应的另一个动作。这是一系列行动的例子。

这是Api.Store.js

    import Reflux from 'reflux';

    import Actions from './Actions';
    import ApiFct from './../utils/ws.api.js';

    function _apiInit() { ApiFct.init(); }
    function _apiInitDone() { ApiFct.getData(); }
    function _apiSetData(data) { ApiFct.setData(data); }

    var ApiStoreObject = {
        listenables: Actions,
        apiInit: _apiInit,
        apiInitDone: _apiInitDone,
        apiSetData: _apiSetData
    }
    const ApiStore = Reflux.createStore(ApiStoreObject);
    export default ApiStore;

这是ws.api.js

    import Actions from '../flux/Actions';

    module.exports = {
        socket: {},
        init: function() {
            this.socket = new Primus();
            this.socket.on('server:GotData', this.gotData);
            Actions.apiInitDone();
        },
        getData: function() { this.socket.send('client:GetData', {}); },
        gotData: function(data) { Actions.gotData(data); Actions.gotData2(data); },
        setData: function(data) { this.socket.send('client:SetData', data); },
    };

这是Actions.js

    import Reflux from 'reflux';

    var apiActions = [
        'apiInit',
        'apiInitDone',
        'apiSetData'
    ]

    var wsActions = [
        'gotData',
        'gotData2'
    ]

    var actionArray = wsActions.concat(apiActions);
    module.exports = Reflux.createActions(actionArray);

这是app.js

    'use strict';

    import React  from 'react';

    import AppCtrl from './components/app.ctrl.js';
    import Actions from './flux/Actions';
    import ApiStore from './flux/Api.Store';

    window.React = React;

    Actions.apiInit();

    React.render( <AppCtrl />, document.getElementById('react') );

Flux：waitFor特定事件

1 个答案: