Question

我有这样的代码示例

val request: Defered[Int] = client.getSomeIntAsynFromSocket();

request.addCallBack(result => result.success[String])
request.addErrback(error => error.fail[Integer])

如何从deferred'request'和可用的回调中构造Future [Validation [String，Int]]

============================================== < / p>

我自己的解决方案：

val f = Future {
    val queue = java.util.concurrent.ArrayBlockingQueue[Validation[String, Int]](1)

    val request: Defered[Int] = client.getSomeIntAsynFromSocket();
    request.addCallBack(result => queue.add(result.success[String]))
    request.addErrback(error => queue(error.fail[Integer]))

    f.take
}

Answer 1

对于Akka 2.x，将方法放在某处，您可以通过导入重复使用它。

def asFuture[T](d: Defered[T])(implicit e: ExecutionContext): Future[T] = {
  val p = Promise[T]()
  d.addCallback(r => p tryComplete Right(r))
  d.addErrback(e => p tryComplete Left(e))
  p.future
}

val f = asFuture(client.getIntAsynFromSocket())

从回调构造scala / akka Future

1 个答案: