Akka/Scala example source code file (MetricNumericConverterSpec.scala)

This example Akka source code file (MetricNumericConverterSpec.scala) is included in my "Source Code Warehouse" project. The intent of this project is to help you more easily find Akka and Scala source code examples by using tags.

All credit for the original source code belongs to akka.io; I'm just trying to make examples easier to find. (For my Scala work, see my Scala examples and tutorials.)

Akka tags/keywords

akka, cluster, failure, matchers, metricnumericconverter, metricnumericconverterspec, none, runtimeexception, some, utilities, wordspec

The MetricNumericConverterSpec.scala Akka example source code

/*
 * Copyright (C) 2009-2014 Typesafe Inc. <http://www.typesafe.com>
 */

package akka.cluster

import org.scalatest.WordSpec
import org.scalatest.Matchers
import akka.cluster.StandardMetrics._
import scala.util.Failure

@org.junit.runner.RunWith(classOf[org.scalatest.junit.JUnitRunner])
class MetricNumericConverterSpec extends WordSpec with Matchers with MetricNumericConverter {

  "MetricNumericConverter" must {

    "convert" in {
      convertNumber(0).isLeft should be(true)
      convertNumber(1).left.get should be(1)
      convertNumber(1L).isLeft should be(true)
      convertNumber(0.0).isRight should be(true)
    }

    "define a new metric" in {
      val Some(metric) = Metric.create(HeapMemoryUsed, 256L, decayFactor = Some(0.18))
      metric.name should be(HeapMemoryUsed)
      metric.value should be(256L)
      metric.isSmooth should be(true)
      metric.smoothValue should be(256.0 +- 0.0001)
    }

    "define an undefined value with a None " in {
      Metric.create("x", -1, None).isDefined should be(false)
      Metric.create("x", java.lang.Double.NaN, None).isDefined should be(false)
      Metric.create("x", Failure(new RuntimeException), None).isDefined should be(false)
    }

    "recognize whether a metric value is defined" in {
      defined(0) should be(true)
      defined(0.0) should be(true)
    }

    "recognize whether a metric value is not defined" in {
      defined(-1) should be(false)
      defined(-1.0) should be(false)
      defined(Double.NaN) should be(false)
    }
  }
}