flux | 易学教程

Why should I keep the state flat

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问题 I'm using ReactJs with Redux and on some tutorials and codes I see people suggesting and using normalizr to keep the state flat . But what is the real advantage in keeping it flat ? Will I encounter any problems if I don't ? Is it necessary ? 回答1: Three main reasons: Updating nested Javascript objects immutably generally results in uglier code that is harder to maintain, unless you use a utility library to wrap up the process Immutably updating nested data requires that you return new copies

How to coordinate server error messages between Flux and React?

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问题 I've been learning React and Flux over the past few months, and one thing I've not yet dealt with is displaying error messages to users. Specifically, error messages that occur as a result of an ajax http request within a flux action creator method. A simple example is user sign in - if the sign in ajax request fails due to a bad password, the server responds with the failure. At that moment, within my flux action creator method, my only option is to dispatch an action containing the error

Sharing data between components in React

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问题 I'm developing an app using Meteor and React as view engine Consider this diagram: React hide component from another example I need to change C2 component state when C4 button click event is fired. Since they don't have a direct relationship i cannot access to C2 state directly from C4. Another example would be submit a form from a Component and get the data (value of input fields) declared in another Component. I know there are some possible hacks to solve this problem (e.g. Meteor Session,

reactor3 flux的map与flatMap的区别

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序本文主要研究一下flux的map与flatMap的区别 map @Test public void test Map() throws InterruptedException { Flux.just(1, 2, 3, 4) .log() .map(i -> { try { TimeUnit.SECONDS.sleep(1); } catch (InterruptedException e) { e.printStackTrace(); } return i * 2; }) .subscribe(e -> LOGGER.info( "get:{}" ,e)); } 复制代码这里头的map是纯元素转换输出 10:53:57.058 [main] INFO reactor.Flux.Array.1 - | onSubscribe([Synchronous Fuseable] FluxArray.ArraySubscription) 10:53:57.062 [main] INFO reactor.Flux.Array.1 - | request(unbounded) 10:53:57.063 [main] INFO reactor.Flux.Array.1 - | onNext(1) 10:53:58.067 [main] INFO com.example.demo

Spring Reactor 入门与实践

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适合阅读的人群：本文适合对 Spring、Netty 等框架，以及 Java 8 的 Lambda、Stream 等特性有基本认识，希望了解 Spring 5 的反应式编程特性的技术人员阅读。一、前言最近几年，随着 Node.js、Golang 等新技术、新语言的出现，Java 的服务器端开发语言老大的地位受到了不小的挑战。虽然，Java 的市场份额依旧很大，短时间内也不会改变，但 Java 社区对于挑战也并没有无动于衷。相反，Java 社区积极应对这些挑战，不断提高自身应对高并发服务器端开发场景的能力。为了应对高并发的服务器端开发，在2009年的时候，微软提出了一个更优雅地实现异步编程的方式 —— Reactive Programming，中文称反应式编程。随后，其它技术也迅速地跟上了脚步，像 ES6 通过 Promise 引入了类似的异步编程方式。Java 社区也没有落后很多，Netflix 和 TypeSafe 公司提供了 RxJava 和 Akka Stream 技术，让 Java 平台也有了能够实现反应式编程的框架。其实，在更早之前，像 Mina 和 Netty 这样的 NIO 框架其实也能搞定高并发的服务器端开发任务，但这样的技术相对来说只是少数高级开发人员手中的工具。对于更多的普通开发者来说，难度显得大了些，所以不容易普及。很多年过去了，到了2017年

Why should addChangeListener be in componentDidMount instead of componentWillMount?

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问题 I saw this line as an answer to another question on here: "componentWillMount should be componentDidMount, or else you'll leak event emitters in node." and I don't really understand it. Can someone explain with more detail? More info: Building a react application with flux, as part of the initial render, a child component computes some data. Ideally, after this data is computed, I would like to call an action that updates the store's state with a portion of this new data. Normally, updating

data flow in react application

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I am currently learning react and I have run into the problem of elegently extracting states from my components. basically I have a few components which contains forms and other inputs from which I need the data in my business logic, the data I need is coupled with the state of the component. From what I understand the data should have unidirectional flow but I can't think of how I can make my data flow back towards my business logic. I could just make some interface functions which call the respective, but I feel this would violate the unidirectional flow. anyhelp with some examples would be

状态管理之 Flux、Redux、Vuex、MobX（概念篇）

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本文是对 Flux、Redux、Vuex、MobX 几种常用状态管理模式的总结，偏向于概念层面，不涉及过多代码。状态管理什么是状态管理？状态管理就是，把组件之间需要共享的状态抽取出来，遵循特定的约定，统一来管理，让状态的变化可以预测。为什么需要状态管理？状态共享组件之间通常会有一些共享的状态，在 Vue 或者 React 中我们一般会将这部分状态提升至公共父组件的 props 中，由父组件来统一管理共享的状态，状态的改变也是由父组件执行并向下传递。这样会导致两个问题: 需要将共享的状态提升至公共的父组件，若无公共的父组件，往往需要自行构造状态由父组件自上而下逐层传递，若组件层级过多，数据传递会变得很冗杂变化跟踪在应用调试过程中，可能会有跟踪状态变化过程的需求，方便对某些应用场景的复现和回溯。这时候就需要统一对状态进行管理，并遵循特定的约定去变更状态，从而让状态的变化可预测。 Store 模式 Store 模式是一种相对简单的状态管理模式，一般有以下约定：状态存储在外部变量 store 里（也可以是全局变量） store 中的 state 用于存储数据，由 store 实例维护 store 中的 actions 封装了改变 state 的逻辑流程图如下：如果对 state 的变更均通过 actions，那么实现记录变更、保存快照、历史回滚就会很简单，但是

How can I return a Flux<Order> when my response is wrapped in a json pagination object with Spring 5?

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问题 I've got a web service that I'm trying to consume with the new Spring 5 WebClient. Working example # GET /orders/ [ { orderId: 1, ... }, { orderId: 1, ... } ] And the java code for the call // Java Flux<Order> ordersStream = webClient.get() .uri("/orders/") .exchange() .flatMap(response -> response.bodyToFlux(Order.class)); Problem The response from the web service is paginated and therefore doesn't contain the list of items directly as in the example above. It looks like this # GET /orders/

状态管理之 Flux、Redux、Vuex、MobX（概念篇）

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