异步垂直与复合未来垂直。 它们有何不同？

Question

I have two Hello World handle methods written in Kotlin Vert.x. I want to get a clear understanding of how they are working, if possible in detail. One is AsyncVertilce while other is CompositeVerticle.

This one is Hello World Coroutine Async Verticle handle method.

    var result = async {
        callFunctionAwait(
            getDependentAddress(HELLO_WORLD), message.headers(), message.body(), messageMarker
        )
    }

    var result1 = async {
        callFunctionAwait(
            getDependentAddress(HELLO_WORLD), message.headers(), message.body(), messageMarker
        )
    }

    // both requests are going to execute in parallel
    val res = result.await()
    val res1 = result1.await()
    message.reply(res.body, DeliveryOptions().setHeaders(res1.headers))

}

This one is Hello World Coroutine Composite Verticle

    var future1 = callFunction(getDependentAddress(HELLO_WORLD), message.headers(), message.body(), messageMarker)
    var future2 = callFunction(getDependentAddress(HELLO_WORLD), message.headers(), message.body(), messageMarker)

    val result = CompositeFuture.all(future1, future2).await()
    if (result.succeeded()) {
        message.reply(future1.result().body, DeliveryOptions().setHeaders(future2.result().headers))
    } else {
        log.error(messageMarker, "Request failed with an exception ", result.cause())
        message.fail(500, result.cause().message)
    }
}

Answer 1

From the documentation

CompositeFuture.all() takes several futures arguments (up to 6) and returns a future that is succeeded when all the futures are succeeded and failed when at least one of the futures is failed

One of the main use cases is when you want all or nothing operations; when you expect a single result for a given number of futures.

There are other variants of CompositeFuture like CompositeFuture.any and CompositeFuture.join

The async way of executing futures, will run each future individually and their results will be gotten irrespective of the other future(s).