如何从期货＃awaitAll的结果中获得一些（x）？

Question

全部。

我写了下面简单的代码来测试scala.actors._：

// java version "1.7.0_02" 
// Scala code runner version 2.9.1.final 
// Windows 7 Ultimate sp1 64-bit 
import scala.actors._ 
import scala.collection.mutable.ArrayBuffer 

object FutureResults extends App { 
    val t1 = System.currentTimeMillis 
    val (timeout, results) = (1000, new ArrayBuffer[Future[_]]) 
    for (i <- 0 until 3) results += new FutureResultsActor !! "execute" 
    val options = Futures awaitAll (timeout, results:_*) 

    val t2 = System.currentTimeMillis 
    println("spent: %,d ms" format t2 - t1) 
    options foreach println 
    results foreach { i => println("isSet: %b" format i.isSet) } 

    Thread sleep timeout 

    val t3 = System.currentTimeMillis 
    println("spent: %,d ms" format t3 - t1) 
    options foreach println 
    results foreach { i => println("isSet: %b" format i.isSet) } 
} 

class FutureResultsActor extends Actor { 
    start 
    override def act = react { case "execute" => Futures future "done" } 
} 

这将产生：

spent: 1,092 ms 
None 
None 
None 
isSet: false 
isSet: false 
isSet: false 

spent: 2,137 ms 
None 
None 
None 
isSet: false 
isSet: false 
isSet: false 

期货Scaladoc的＃awaitAll说：

The result of a future that resolved during the time span is its value wrapped in Some. 
The result of a future that did not resolve during the time span is None. 

是超时值太小？好吧，我将该值更改为5000毫秒，然后重试：

spent: 5,070 ms 
None 
None 
None 
isSet: false 
isSet: false 
isSet: false 

spent: 10,093 ms 
None 
None 
None 
isSet: false 
isSet: false 
isSet: false 

全部为无。为什么？...

如何从期货＃awaitAll的结果中获得一些（x）？

有没有不正确的代码？

Answer 1

事实上，他们都超时。非常悲剧！原因是：你没有发送演员的回复，或者至少没有正确回复。我真的不知道什么是“期货未来”是，但是......我的理解是正确的方式从内部的演员是像这样回复：

class FutureResultsActor extends Actor { 
    start 
    override def act = react { case "execute" => reply("done") } // Use reply()! 
} 

做这让我这样的结果：

spent: 150 ms 
Some(done) 
Some(done) 
Some(done) 
isSet: true 
isSet: true 
isSet: true 
spent: 1,165 ms 
Some(done) 
Some(done) 
Some(done) 
isSet: true 
isSet: true 
isSet: true