来自 node.js 背景,我是 Scala 的新手,我尝试使用 Twitter 的 Future.collect 来执行一些简单的并发操作。但是我的代码显示的是顺序行为而不是并发行为。我究竟做错了什么?
这是我的代码,
import com.twitter.util.Future
def waitForSeconds(seconds: Int, container:String): Future[String] = Future[String] {
Thread.sleep(seconds*1000)
println(container + ": done waiting for " + seconds + " seconds")
container + " :done waiting for " + seconds + " seconds"
}
def mainFunction:String = {
val allTasks = Future.collect(Seq(waitForSeconds(1, "All"), waitForSeconds(3, "All"), waitForSeconds(2, "All")))
val singleTask = waitForSeconds(1, "Single")
allTasks onSuccess { res =>
println("All tasks succeeded with result " + res)
}
singleTask onSuccess { res =>
println("Single task succeeded with result " + res)
}
"Function Complete"
}
println(mainFunction)
这是我得到的输出,
All: done waiting for 1 seconds
All: done waiting for 3 seconds
All: done waiting for 2 seconds
Single: done waiting for 1 seconds
All tasks succeeded with result ArraySeq(All :done waiting for 1 seconds, All :done waiting for 3 seconds, All :done waiting for 2 seconds)
Single task succeeded with result Single :done waiting for 1 seconds
Function Complete
我期望的输出是,
All: done waiting for 1 seconds
Single: done waiting for 1 seconds
All: done waiting for 2 seconds
All: done waiting for 3 seconds
All tasks succeeded with result ArraySeq(All :done waiting for 1 seconds, All :done waiting for 3 seconds, All :done waiting for 2 seconds)
Single task succeeded with result Single :done waiting for 1 seconds
Function Complete