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package kamon.trace
import java.nio.ByteBuffer
import java.util.concurrent.ThreadLocalRandom
import kamon.util.HexCodec
import scala.util.Try
trait IdentityProvider {
def traceIdentifierGenerator(): IdentityProvider.Generator
def spanIdentifierGenerator(): IdentityProvider.Generator
}
object IdentityProvider {
case class Identifier(string: String, bytes: Array[Byte])
val NoIdentifier = Identifier("", new Array[Byte](0))
trait Generator {
def generate(): Identifier
def from(string: String): Identifier
def from(bytes: Array[Byte]): Identifier
}
class Default extends IdentityProvider {
private val generator = new Generator {
override def generate(): Identifier = {
val data = ByteBuffer.wrap(new Array[Byte](8))
val random = ThreadLocalRandom.current().nextLong()
data.putLong(random)
Identifier(HexCodec.toLowerHex(random), data.array())
}
override def from(string: String): Identifier = Try {
val identifierLong = HexCodec.lowerHexToUnsignedLong(string)
val data = ByteBuffer.allocate(8)
data.putLong(identifierLong)
Identifier(string, data.array())
} getOrElse(IdentityProvider.NoIdentifier)
override def from(bytes: Array[Byte]): Identifier = Try {
val buffer = ByteBuffer.wrap(bytes)
val identifierLong = buffer.getLong
Identifier(HexCodec.toLowerHex(identifierLong), bytes)
} getOrElse(IdentityProvider.NoIdentifier)
}
override def traceIdentifierGenerator(): Generator = generator
override def spanIdentifierGenerator(): Generator = generator
}
object Default {
def apply(): Default = new Default()
}
}
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