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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
package util
import kamon.trace.{ActiveSpan, Continuation}
/**
* Utility trait that marks objects carrying an ActiveSpan.Continuation.
*/
trait HasContinuation {
def continuation: Continuation
}
object HasContinuation {
private class Default(val continuation: Continuation) extends HasContinuation
/**
* Construct a HasContinuation instance by capturing a continuation from the provided active span.
*/
def from(activeSpan: ActiveSpan): HasContinuation = {
val continuation = if(activeSpan == null) null else activeSpan.capture()
new Default(continuation)
}
/**
* Constructs a new HasContinuation instance using Kamon's tracer currently active span.
*/
def fromTracerActiveSpan(): HasContinuation =
new Default(Kamon.activeSpanContinuation())
}
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