[英]convert Scala Future to Twitter Future
I use Finagle as a web server which I want to return Scala-Futures from my application logic. 我使用Finagle作为Web服务器,我想从我的应用程序逻辑返回Scala-Futures。 How to convert scala.concurrent.Future to com.twitter.util.Future, in a non-blocking way of course?
如何将scala.concurrent.Future转换为com.twitter.util.Future,当然是以非阻塞的方式?
Have not enough environment to test this, but here is what i write for "com.twitter" %% "finagle-http" % "6.25.0"
: 没有足够的环境来测试这个,但这里是我写的
"com.twitter" %% "finagle-http" % "6.25.0"
:
import com.twitter.{util => twitter}
import scala.concurrent.{ExecutionContext, Promise, Future}
import scala.util.{Failure, Success, Try}
import language.implicitConversions
object TwitterConverters {
implicit def scalaToTwitterTry[T](t: Try[T]): twitter.Try[T] = t match {
case Success(r) => twitter.Return(r)
case Failure(ex) => twitter.Throw(ex)
}
implicit def twitterToScalaTry[T](t: twitter.Try[T]): Try[T] = t match {
case twitter.Return(r) => Success(r)
case twitter.Throw(ex) => Failure(ex)
}
implicit def scalaToTwitterFuture[T](f: Future[T])(implicit ec: ExecutionContext): twitter.Future[T] = {
val promise = twitter.Promise[T]()
f.onComplete(promise update _)
promise
}
implicit def twitterToScalaFuture[T](f: twitter.Future[T]): Future[T] = {
val promise = Promise[T]()
f.respond(promise complete _)
promise.future
}
}
It's also possible to use Twitter bijections library: https://github.com/twitter/bijection 也可以使用Twitter bijections库: https : //github.com/twitter/bijection
Namely com.twitter.bijection.twitter_util.UtilBijections
( https://github.com/twitter/bijection/blob/develop/bijection-util/src/main/scala/com/twitter/bijection/twitter_util/UtilBijections.scala ) 即
com.twitter.bijection.twitter_util.UtilBijections
( https://github.com/twitter/bijection/blob/develop/bijection-util/src/main/scala/com/twitter/bijection/twitter_util/UtilBijections.scala )
This library handles important details, for example if you convert object forth and back, it just unwraps original object. 此库处理重要的细节,例如,如果您前后转换对象,它只是解开原始对象。
Here's an example using the twitter bijection library: 以下是使用twitter双向库的示例:
import scala.concurrent.{Future => ScalaFuture}
import com.twitter.util.{Future => TwitterFuture}
// extend values by adding the conversion method "as"
import com.twitter.bijection.Conversion.asMethod
// pull in various implicit converters that "as" expects,
// including twitter2ScalaFuture:
import com.twitter.bijection.twitter_util.UtilBijections._
def doSomething: ScalaFuture[T] = {
val response: TwitterFuture[T] = ???
response.as[ScalaFuture[T]]
}
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