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Vertx - Future.compose
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Represents the result of an action that may, or may not, have occurred yet.
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 ...
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 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 ...
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.
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.
不过，这不应该与Java的 Future 混淆。 Vert.x的Future实现是完全独立的。 💡提示: 尽管 Vert.x Future 可以使用 toCompletionStage() 方法转换为 Java的 Future 。 Vert.x Future 有两个描述非常相似且可能会让您感到困惑的方法： compose 和 map 。
Methods inherited from interface io.vertx.core. Future andThen, andThen, await, await, cause, compose, compose, eventually, expecting, failed, flatMap, isComplete, map, map, mapEmpty, onComplete, onComplete, otherwise, otherwise, otherwiseEmpty, recover, result, succeeded, timeout, toCompletionStage, transform, transform
private Future cacheAvatarFromUserBook(String userId, Optional pictureId, Boolean remove) { // clean avatar when changing or when removing Future futureClean = (pictureId.isPresent() || remove) ? cleanAvatarCache(userId)