在Scala时间有限的尽力而为计算上获得部分结果

import scala.concurrent.Future
import scala.concurrent.ExecutionContext.Implicits.global

def longRunningTask(): Future[Int] = Future {
  // 执行耗时的计算任务
  Thread.sleep(1000)
  42
}

val result: Future[Int] = longRunningTask()
result.onComplete {
  case Success(value) => println(s"计算结果: $value")
  case Failure(exception) => println(s"计算失败: $exception")
}

import scala.concurrent.{Future, Promise}
import scala.concurrent.ExecutionContext.Implicits.global

def longRunningTask(): Future[Int] = {
  val promise = Promise[Int]()
  
  // 执行耗时的计算任务
  Thread.sleep(1000)
  
  // 完成Promise并传递计算结果
  promise.success(42)
  
  promise.future
}

val result: Future[Int] = longRunningTask()
result.onComplete {
  case Success(value) => println(s"计算结果: $value")
  case Failure(exception) => println(s"计算失败: $exception")
}