20、Flux架构中的调度器、存储与视图组件解析

Flux架构中的调度器、存储与视图组件解析

1. 调度器的实现

在Flux架构中，调度器是一个关键组件。与Facebook参考实现不同，这里的调度器是一个简单的模块，暴露了几个函数，包括 dispatch() 和 register() 。

• dispatch() 函数 ：

// Used by action creator functions to dispatch an
// action payload.
export function dispatch(payload) {
  // The dispatcher is busy, meaning that we've
  // called "dispatch()" while an update round
  // was already taking place.
  if (busy) {
    throw 'Nested dispatch() call detected';
  }
  // Marks the dispatcher as "busy" before we
  // start calling any store handlers.
  busy = true;
  // The action "type" determines the method
  // that we'll call on a the store.
  let { type } = payload;