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/* =========================================================================================
* Copyright © 2013-2017 the kamon project <http://kamon.io/>
*
* Licensed under the Apache License, Version 2.0 (the "License"); you may not use this file
* except in compliance with the License. You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software distributed under the
* License is distributed on an "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND,
* either express or implied. See the License for the specific language governing permissions
* and limitations under the License.
* =========================================================================================
*/
package kamon.testkit
import java.time.Instant
import kamon.Kamon
import kamon.trace.{Span, SpanContext}
import kamon.trace.Span.FinishedSpan
import scala.reflect.ClassTag
import scala.util.Try
trait SpanInspection {
def inspect(span: Span): SpanInspection.Inspector =
new SpanInspection.Inspector(span)
}
object SpanInspection {
class Inspector(span: Span) {
private val (realSpan, spanData) = Try {
val realSpan = span match {
case _: Span.Local => span
case other => sys.error(s"Only Span.Local can be inspected but got [${other.getClass.getName}]" )
}
val spanData = invoke[Span.Local, FinishedSpan](realSpan, "toFinishedSpan", classOf[Instant] -> Kamon.clock().instant())
(realSpan, spanData)
}.getOrElse((null, null))
def isEmpty: Boolean =
realSpan == null
def spanTag(key: String): Option[Span.TagValue] =
spanData.tags.get(key)
def spanTags(): Map[String, Span.TagValue] =
spanData.tags
def metricTags(): Map[String, String] =
getField[Span.Local, Map[String, String]](realSpan, "customMetricTags")
def from(): Instant =
getField[Span.Local, Instant](realSpan, "from")
def context(): SpanContext =
spanData.context
def operationName(): String =
spanData.operationName
private def getField[T, R](target: Any, fieldName: String)(implicit classTag: ClassTag[T]): R = {
val toFinishedSpanMethod = classTag.runtimeClass.getDeclaredFields.find(_.getName.contains(fieldName)).get
toFinishedSpanMethod.setAccessible(true)
toFinishedSpanMethod.get(target).asInstanceOf[R]
}
private def invoke[T, R](target: Any, fieldName: String, parameters: (Class[_], AnyRef)*)(implicit classTag: ClassTag[T]): R = {
val parameterClasses = parameters.map(_._1)
val parameterInstances = parameters.map(_._2)
val toFinishedSpanMethod = classTag.runtimeClass.getDeclaredMethod(fieldName, parameterClasses: _*)
toFinishedSpanMethod.setAccessible(true)
toFinishedSpanMethod.invoke(target, parameterInstances: _*).asInstanceOf[R]
}
}
}
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