reactive

RxJS: JSON data with an array, processing each item further in the stream

会有一股神秘感。 提交于 2019-11-28 05:57:46
问题 I receive a HTTP response, which contains, if all goes well, a single array, coded as JSON. I want to get this array, filter out some items, and process the passing items as events. What I do so far is: return this._http.get(url) .map((res:Response) => res.json()) .map((data:any) => { if (!Array.isArray(data) || data.length == 0) { throw new Error("No items returned, URL: " + url); } let projects = <ProjectModel[]>service.fromJSONarray(data, this._http); return Observable.from(projects)

ReactiveCrudRepository to use Hibernate in spring

你说的曾经没有我的故事 提交于 2019-11-28 05:56:06
Is it possible to use Hibernate and Mysql with ReactiveCrudRepository instead of CrudRepository ? I have tried some samples with Spring Data Jpa and Hibernate, but couldn't get it to work. I was only able to find a few samples on ReactiveCrudRepository for MongoDB and cassandra . Is it possible to use Hibernate and Mysql with ReactiveCrudRepository instead of CrudRepository ? TL;DR: Not with Hibernate and MySQL, but with R2DBC and Postgres, Microsoft SQL Server or H2. Take a look at Spring Data R2DBC . Long Version Why not JPA? With Hibernate/JPA included this won't happen in the foreseeable

When to use RxJava in Android and when to use LiveData from Android Architectural Components?

放肆的年华 提交于 2019-11-28 02:38:30
I am not getting the reason to use RxJava in Android and LiveData from Android Architectural Components.It would be really helpful if the usecases and differences between the both are explained along with sample example in the form of code which explains the differences between the both. Android LiveData is a variant of the original observer pattern, with the addition of active/inactive transitions. As such, it is very restrictive in its scope. Using the example described in Android LiveData , a class is created to monitor location data, and register and unregister based on application state.

Spring WebClient vs. RestTemplate

强颜欢笑 提交于 2019-11-27 16:37:21
1. 简介 本教程中,我们将对比 Spring 的两种 Web 客户端实现 —— RestTemplate 和 Spring 5 中全新的 Reactive 替代方案 WebClient 。 2. 阻塞式 vs 非阻塞式客户端 Web 应用中,对其他服务进行 HTTP 调用是一个很常见的需求。因此,我们需要一个 Web 客户端工具。 2.1. RestTemplate 阻塞式客户端 很长一段时间以来,Spring 一直提供 RestTemplate 作为 Web 客户端抽象。在底层, RestTemplate 使用了基于每个请求对应一个线程模型(thread-per-request)的 Java Servlet API。 这意味着,直到 Web 客户端收到响应之前,线程都将一直被阻塞下去。而阻塞代码带来的问题则是,每个线程都消耗了一定的内存和 CPU 周期。 让我们考虑下有很多传入请求,它们正在等待产生结果所需的一些慢服务。 等待结果的请求迟早都会堆积起来。**因此,程序将创建很多线程,这些线程将耗尽线程池或占用所有可用内存。**由于频繁的 CPU 上下文(线程)切换,我们还会遇到性能下降的问题。 2.2. WebClient 非阻塞式客户端 另一方面, WebClient 使用 Spring Reactive Framework 所提供的异步非阻塞解决方案。 当

When to use RxJava in Android and when to use LiveData from Android Architectural Components?

て烟熏妆下的殇ゞ 提交于 2019-11-27 04:56:26
问题 I am not getting the reason to use RxJava in Android and LiveData from Android Architectural Components.It would be really helpful if the usecases and differences between the both are explained along with sample example in the form of code which explains the differences between the both. 回答1: Android LiveData is a variant of the original observer pattern, with the addition of active/inactive transitions. As such, it is very restrictive in its scope. Using the example described in Android

ReactiveCrudRepository to use Hibernate in spring

会有一股神秘感。 提交于 2019-11-27 01:07:21
问题 Is it possible to use Hibernate and Mysql with ReactiveCrudRepository instead of CrudRepository ? I have tried some samples with Spring Data Jpa and Hibernate, but couldn't get it to work. I was only able to find a few samples on ReactiveCrudRepository for MongoDB and cassandra . 回答1: Is it possible to use Hibernate and Mysql with ReactiveCrudRepository instead of CrudRepository ? TL;DR: Not with Hibernate and MySQL, but with R2DBC and Postgres, Microsoft SQL Server or H2. Take a look at