如何使用Net-SNMP API编写发送用户定义的陷阱的代码(How to write a code sending user defined traps by using Net-SNMP API)

 所以现在我已经尝试使用Scalaz Either（这是一个正确的偏向Either与中性scala Either相比）和Monad Transformer EitherT，它似乎完全符合我的要求。 感谢Huw，特别是Lars Hupel暗示我正确的方向。 
 
 这里有一个Twitter期货和Scalaz Either和EitherT的样本： 
 
import com.twitter.util.{Await, Future}
import scalaz.{Monad, Functor, EitherT, \/}
import scalaz.syntax.ToIdOps

object EitherTest extends App with ToIdOps{

  // make Twitter futures work with EitherT
  implicit val FutureFunctor = new Functor[Future] {
    def map[A, B](a: Future[A])(f: A => B): Future[B] = a map f
  }
  implicit val FutureMonad = new Monad[Future] {
    def point[A](a: => A): Future[A] = Future(a)
    def bind[A, B](fa: Future[A])(f: (A) => Future[B]): Future[B] = fa flatMap f
  }

  // The example begins here:

  case class InvalidInfo(error: String)
  case class Response(msg: String)


  class ComponentA {
    def foo(fail: Boolean): Future[\/[InvalidInfo, Response]] = {
      if(fail) Future(InvalidInfo("Error A").left) else Future(Response("ComponentA Success").right)
    }
  }
  class ComponentB {
    def bar(fail: Boolean): Future[\/[InvalidInfo, Response]] = {
      if(fail) Future(InvalidInfo("Error B").left) else Future(Response("ComponentB Success").right)
    }
  }

  val a = new ComponentA
  val b = new ComponentB

  val result = for {
    resultA <- EitherT(a.foo(false))
    resultB <- EitherT(b.bar(false))
  } yield (resultA, resultB)

  println(Await.result(result.run))
}

So now I've tried to use Scalaz Either (which is a right biased Either compared to the neutral scala Either) and the Monad Transformer EitherT and it seems it does exactly what I want. Thanks to Huw and especially Lars Hupel for hinting me in the right direction.
 
Here is working a sample for Twitter futures and Scalaz Either and EitherT:
 
import com.twitter.util.{Await, Future}
import scalaz.{Monad, Functor, EitherT, \/}
import scalaz.syntax.ToIdOps

object EitherTest extends App with ToIdOps{

  // make Twitter futures work with EitherT
  implicit val FutureFunctor = new Functor[Future] {
    def map[A, B](a: Future[A])(f: A => B): Future[B] = a map f
  }
  implicit val FutureMonad = new Monad[Future] {
    def point[A](a: => A): Future[A] = Future(a)
    def bind[A, B](fa: Future[A])(f: (A) => Future[B]): Future[B] = fa flatMap f
  }

  // The example begins here:

  case class InvalidInfo(error: String)
  case class Response(msg: String)


  class ComponentA {
    def foo(fail: Boolean): Future[\/[InvalidInfo, Response]] = {
      if(fail) Future(InvalidInfo("Error A").left) else Future(Response("ComponentA Success").right)
    }
  }
  class ComponentB {
    def bar(fail: Boolean): Future[\/[InvalidInfo, Response]] = {
      if(fail) Future(InvalidInfo("Error B").left) else Future(Response("ComponentB Success").right)
    }
  }

  val a = new ComponentA
  val b = new ComponentB

  val result = for {
    resultA <- EitherT(a.foo(false))
    resultB <- EitherT(b.bar(false))
  } yield (resultA, resultB)

  println(Await.result(result.run))
}