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package kamon.trace
trait Scope extends AutoCloseable {
def close(): Unit
}
trait ActiveSpanSource {
def activeSpan(): Span
def activate(span: Span): Scope
def activate(span: Span, finishOnClose: Boolean): Scope
}
object ActiveSpanSource {
final class ThreadLocalBased extends ActiveSpanSource {
private val emptySpan = Span.Empty(this)
private val storage: ThreadLocal[Span] = new ThreadLocal[Span] {
override def initialValue(): Span = emptySpan
}
override def activeSpan(): Span =
storage.get()
override def activate(span: Span): Scope =
activate(span, finishOnClose = false)
override def activate(span: Span, finishOnClose: Boolean): Scope = {
val previouslyActiveSpan = storage.get()
storage.set(span)
new Scope {
override def close(): Unit = {
storage.set(previouslyActiveSpan)
if (finishOnClose && span != null)
span.finish()
}
}
}
}
object ThreadLocalBased {
def apply(): ThreadLocalBased = new ThreadLocalBased()
}
}
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