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The Future object implements some interesting patterns that smartly help resolving async issues: Map Compose Recover Future Mapping For those of you who know about the map function, part of the java Stream API, this feature should be immediate to understand. The Future's map function accepts a function that transforms the result from one type ...
Represents the result of an action that may, or may not, have occurred yet.
The great advantage of using Future is the ability to chain them using Future.compose(). First, let's translate standard Vertx methods, which receive callbacks to methods and returns Future.
compose with vertx for sequential code Asked 8 years, 1 month ago Modified 6 years, 10 months ago Viewed 15k times
Future.compose () example Note: if the first future fails, the whole future sequence fails, and the handler is skipped. Compose is very useful for daisy chaining two or three dependent futures ...
Future 和 Promise 是 Vert.X 4.0中的重要角色，贯穿了整个 Vert.X 框架。掌握 Future/Promise 的用法，是用好 Vert.X、编写高质量异步代码的基础。本文从 Future/Promise 的概念出发，介绍这两者的定义以及如何理解其定义；然后介绍 Prom
Compose this future with a provided next future. When this (the one on which compose is called) future succeeds, the handler will be called with the completed value, this handler should complete the next future.
1.vertx中的Future与java原生中不同,二者都有封装结果的功能,但是vertx中为了避免await阻塞event loop线程,导致不能及时响应的问题.通过在Future中定义回调Handler来解决这个问题. demo1:
但是 compose 将实际值包装成一个 Future，而 map 将底层的 Future 包装成一个新值。 我之前承诺过，我将演示在真实的 Vert.x 代码中可以在何处进行 Future 嵌套。
private Future cacheAvatarFromUserBook(String userId, Optional pictureId, Boolean remove) { // clean avatar when changing or when removing Future futureClean = (pictureId.isPresent() || remove) ? cleanAvatarCache(userId)