我想测量 IO 容器内的经过时间。使用普通调用或期货相对容易(例如下面的代码)
class MonitoringComponentSpec extends FunSuite with Matchers with ScalaFutures {
import scala.concurrent.ExecutionContext.Implicits.global
def meter[T](future: Future[T]): Future[T] = {
val start = System.currentTimeMillis()
future.onComplete(_ => println(s"Elapsed ${System.currentTimeMillis() - start}ms"))
future
}
def call(): Future[String] = Future {
Thread.sleep(500)
"hello"
}
test("metered call") {
whenReady(meter(call()), timeout(Span(550, Milliseconds))) { s =>
s should be("hello")
}
}
}
但不确定如何包装 IO 调用
def io_meter[T](effect: IO[T]): IO[T] = {
val start = System.currentTimeMillis()
???
}
def io_call(): IO[String] = IO.pure {
Thread.sleep(500)
"hello"
}
test("metered io call") {
whenReady(meter(call()), timeout(Span(550, Milliseconds))) { s =>
s should be("hello")
}
}
谢谢!