Scalaのインストルメント

import com.newrelic.scala.api.TraceOps.trace

trace("statement segment") {
    val i = 1
    val j = 2
    println(i + j)
}
// trace can also be used as an expression
val x: Int = trace("expression segment") {
    val i = 1
    val j = 2
    i + j
}
println(x) // 2

import scala.concurrent.{ExecutionContext, Future}
import com.newrelic.scala.api.TraceOps.trace

// implicit execution
implicit val ec: ExecutionContext = ???

  val x: Option[Int] = for {
    one <- trace("segment one")(Option(1))
    two <- trace("segment two")(Option(one + 1))
    three <- trace("segment three")(Option(two + 1))
  } yield three

println(x) // Some(3)

import scala.concurrent.{ExecutionContext, Future}
import com.newrelic.scala.api.TraceOps.asyncTrace
// implicit execution
implicit val ec: ExecutionContext = ???

val x: Future[Int] = asyncTrace("segment name")(Future {
  Thread.sleep(5000)
  1
})
x.foreach(println) // prints 1 on completion of Future

import scala.concurrent.{ExecutionContext, Future}
import com.newrelic.scala.api.TraceOps.asyncTrace
// implicit execution
implicit val ec: ExecutionContext = ???

 val x: Future[Int] = for {
    one <- asyncTrace("segment one")(Future(1))
    two <- asyncTrace("segment two")(Future(one + 1))
    three <- asyncTrace("segment three")(Future(two + 1))
  } yield three

x.foreach(println) // prints 3 on completion of Future

import com.newrelic.scala.api.TraceOps.traceFun

val x: Option[Int] = Option(1)
            .map(traceFun("statement segment")(i => i + 1))
println(x) //Some(2)

import scala.concurrent.{ExecutionContext, Future}
import com.newrelic.scala.api.TraceOps.asyncTraceFun
// implicit execution
implicit val ec: ExecutionContext = ???

val x: Future[Int] = Future(1)
            .flatMap(asyncTraceFun("statement segment")(i => Future(i + 1)))

x.foreach(println) // prints 2 on completion of Future

import com.newrelic.scala.api.TraceOps.txn
txn {
    val i = 1
    val j = 2
    println(i + j)
}

import com.newrelic.scala.api.TraceOps.txn
val i: Int = txn(1 + 2) //transaction created
println(i) // 3

import scala.concurrent.{ExecutionContext, Future}
import com.newrelic.scala.api.TraceOps.{txn, asyncTrace}
// implicit execution
implicit val ec: ExecutionContext = ???

 val x: Future[Int] = txn(
     for {
        one <- asyncTrace("segment one")(Future(1))
        two <- asyncTrace("segment two")(Future(one + 1))
        three <- asyncTrace("segment three")(Future(two + 1))
    } yield three
 )

x.foreach(println) // prints 3 on completion of Future