Sometimes, the helper methods that RxJS ships with such as fromEvent, fromPromise etc don't always provide the exact values you want & you end up having to do extra work to force them into the shape you require. For more fine-grained control you can…

We have been using Observable.create() a lot in previous lessons, so let's take a closer look how does it work. The create function: var foo = Rx.Observable.create( function(observer){ observer.next(); observer.next(); observer.next(); observer.compl…

1. Observable与观察者模式的关系 其实这里讲的Observable就是一种观察者模式,只不过RxJS把Observable结合了迭代模式以及附件了很多的operator,让他变得很强大,也增添了一些神秘的色彩. 那么设计模式中的观察者模式,其实是非常简单的,可以用生活中的订牛奶的示例来说明, 你订阅了某订奶机构的牛奶,那么付了钱之后,在预定的时间内都会给你送牛奶,如果你取消订阅,那么第二天就收不到新鲜的牛奶了. 其实,观察者模式的模型在生活中很多,突然想到订牛奶,是因为我前段时间订牛…

Get a better understanding of the RxJS Observable by implementing one that's similar from the ground up. class SafeObserver { constructor(destination) { this.destination = destination; } next(value) { const destination = this.destination; if (destina…

old import { Injectable } from '@angular/core'; import { BehaviorSubject } from 'rxjs'; @Injectable({ providedIn: 'root' }) export class DataService { private dataSource = new BehaviorSubject(Object); public currentData = this.dataSource.asObservable…

Download Source Code Providing an example form for creating hierarchical trees in Oracle Forms to control data block records. In this form whenever user selects any node in tree menu then corresponding record is displayed at right side.   This form i…

有这么一个对象c$: Observable<any> 修改里边的值: 声明一个subject subject: Subject<any>; 在ngOnInit()中进行初始化 this.subject = new BehaviorSubject<object>(CLOSE_OPTIONS); 然后将subject赋值给Observable对象 this.c$ = this.subject.asObservable(); 更新值的地方这么写:this.subject.ne…

.share() is an alias for .publish().refCount(). So if the source is not yet completed, no matter how many subscribers subscribe to the source, they share the same source. ).share().take(); const randomNum$ = clock$ .map(i => Math.random() * ).share()…

1. Introduction The Springfox suite of java libraries are all about automating the generation of machine and human readable specifications for JSON APIs written using the spring family of projects. Springfox works by examining an application, once, a…

原文: http://ifeve.com/zookeeper-curato-framework/ zookeeper 的原生客户端库过于底层, 用户为了使用 zookeeper需要编写大量的代码, 为此Curator框架对 zookeeper 进行了高层次的语义封装, 简化使用 zookeeper 的成本. 只可惜 curator 框架仅仅支持 java 语言, 期待 c++版本出现(或者我们自己尝试实现一个) 跟着实例学习ZooKeeper的用法: Curator框架应用 前面的几篇文章介绍了…