reselect | 易学教程

Dubbo服务调用——流程分析

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【推荐】2019 Java 开发者跳槽指南.pdf(吐血整理) >>> 我们根据官网的案例来分析Dubbo的调用过程是什么样的 1.首先粘贴下调用源头 public static void main(String[] args) throws Exception { ClassPathXmlApplicationContext context = new ClassPathXmlApplicationContext(new String[]{"META-INF/spring/dubbo-demo-consumer.xml"}); context.start(); DemoService demoService = (DemoService) context.getBean("demoService"); // 获取远程服务代理 String hello = demoService.sayHello("world"); // 执行远程方法 System.out.println(hello); // 显示调用结果 System.in.read(); } 断点根据调用堆栈得知，实际上调用了InvokerInvocationHandler的代理对象(动态代理) public Object invoke(Object proxy, Method method, Object[] args)

React / Redux / Reselect - is mapped state to props using selectors synchronous or asynchronous?

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问题 In our project we are using react-redux with reselect and redux-saga In the store I have a selectedStageId along with an array of stages and a memoized selector that finds and returns the correct stage based on the id. This selector is mapped to one of my components props as this.props.selectedStage , and in one of my onClick handlers, I dispatch an action to update the selectedStageId to the id of the newly selected UI item, and then attempt to pass the new selectedStage to an edit method...

Reactjs Redux:mapStateToProps not rendering the component on state change

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问题 I have search filter and sort inputs on the same component.I'm using reselect(selector package) where the data array is filtered and sorted. The mapStateToProps is updating the component on each search filter result.but the mapStateToProps is not updating the component after sorting the array. selectors/index.js import { createSelector } from 'reselect' const getListOfCategory = (state) => state.products.product const getSearchText = (state) => state.products.searchText const getSortValue =

Use reselect selector with parameters

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问题 How do I pass additional parameters to combined selectors? I am trying to • Get data • Filter data • Add custom value to my data set / group data by myValue export const allData = state => state.dataTable export const filterText = state => state.filter.get('text') export const selectAllData = createSelector( allData, (data) => data ) export const selectAllDataFiltered = createSelector( [ selectAllData, filterText ], (data, text) => { return data.filter(item => { return item.name === text }) }

Redux - pass ownProps argument to selector

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问题 I cannot pass variable ownProps from mapStateToProps to selector. My selector: export const nameSelector = createSelector( [ state => state.element.get('name') ], (name) => !name.trim() ); const mapStateToProps = (state, ownProps) => ({ disabledAfterSave: nameSelector(state) }); And I need to have a selector: export const nameSelector = createSelector( [ state => state.element.get('name') ], (name, ownProps) => !name.trim() && ownProps.showMessage ); const mapStateToProps = (state, ownProps)

Redux - pass ownProps argument to selector

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I cannot pass variable ownProps from mapStateToProps to selector. My selector: export const nameSelector = createSelector( [ state => state.element.get('name') ], (name) => !name.trim() ); const mapStateToProps = (state, ownProps) => ({ disabledAfterSave: nameSelector(state) }); And I need to have a selector: export const nameSelector = createSelector( [ state => state.element.get('name') ], (name, ownProps) => !name.trim() && ownProps.showMessage ); const mapStateToProps = (state, ownProps) => ({ disabledAfterSave: nameSelector(state, ownProps) }); But now I get an error: ReferenceError:

How to deal with relational data in Redux?

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The app I'm creating has a lot of entities and relationships (database is relational). To get an idea, there're 25+ entities, with any type of relations between them (one-to-many, many-to-many). The app is React + Redux based. For getting data from the Store, we're using Reselect library. The problem I'm facing is when I try to get an entity with its relations from the Store. In order to explain the problem better, I've created a simple demo app, that has similar architecture. I'll highlight the most important code base. In the end I'll include a snippet (fiddle) in order to play with it. Demo