James' Cookbook

Have you ever wanted to perform multiple HTTP requests in Java in parallel and wondered how to execute them in a non blocking fashion ? In this post we are going to explain how to execute them using a nonblocking RESTful API controller using the Spring WebFlux (Netty) framework with WebClient, based on Project Reactor Nonblocking REST controller It is necessary to use the Flux<> type to signify there is a list of items in the response Spring Webflux Client In our example, the Spring Webflux client returns a single string which represents an XML value. It uses a reactive stream using the Mono<> type. Its value is mapped to an object using Jackson. The three HTTP calls are then merged using the Flux.merge statement Performance Comparison The link below compares the performance of API requests performed using the Spring Webflux framework with WebClient versus DeferredResult or CompletableFuture with Servlet and a Blocking HTTP call with servlet https:/...

Have you ever tried to use async pipes  in your Angular application and wondered how to unit test them ? In this post we are going to explain how to unit test them in deeply nested smart components typically used in large scale Angular applications. If you are looking to learn more about async pipes and how to use them with deeply nested smart components, have a look at the post "Angular OnPush Change Detection and Component Design - Avoid Common Pitfalls" Data service First, lets create a data service that sets up an rxjs observable and subject that we will use in the application Front end Next, lets create a front end page with the ability to fire immutable visibility changed and reset events, along with the ability to show content depending on the state of the async pipe. Unit testing Component Host It is necessary to wrap the component in a host component to facilitate unit testing async pipes. Click the following github issue report to discover ...