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。但是我的代码显示了顺序行为而不是并发行为。我究竟做错了什么?Twitter的Future.collect不能同时工作(Scala)
这里是我的代码,
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)
,这是输出我得到的,
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
我想到的是输出,
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
那么'Future'的整个点就是将计算卸载到另一个线程。因此,在mainFunction的第一行中,将产生三个新线程,这些线程(当生成的线程完成时)会产生另一个线程来执行oncomplete函数。 在第二行中,生成另一个线程,并将与其他线程并行执行。所以我认为实际产出似乎有效... – irundaia