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/*
* =========================================================================================
* Copyright © 2013-2014 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.trace
import kamon.trace.TraceLocal.TraceLocalKey
import kamon.util.Supplier
import scala.collection.concurrent.TrieMap
object TraceLocal {
trait TraceLocalKey[T]
trait AvailableToMdc extends TraceLocalKey[String] {
def mdcKey: String
}
object AvailableToMdc {
case class DefaultKeyAvailableToMdc(mdcKey: String) extends AvailableToMdc
def fromKey(mdcKey: String): AvailableToMdc = DefaultKeyAvailableToMdc(mdcKey)
def apply(mdcKey: String): AvailableToMdc = fromKey(mdcKey)
}
case class HttpContext(agent: String, uri: String, xforwarded: String)
object HttpContextKey extends TraceLocal.TraceLocalKey[HttpContext]
def store[T](key: TraceLocalKey[T])(value: Any): Unit = Tracer.currentContext match {
case ctx: MetricsOnlyContext ⇒ ctx.traceLocalStorage.store(key)(value)
case EmptyTraceContext ⇒ // Can't store in the empty context.
}
def retrieve[T](key: TraceLocalKey[T]): Option[T] = Tracer.currentContext match {
case ctx: MetricsOnlyContext ⇒ ctx.traceLocalStorage.retrieve(key)
case EmptyTraceContext ⇒ None // Can't retrieve anything from the empty context.
}
// Java variant
@throws(classOf[NoSuchElementException])
def get[T](key: TraceLocalKey[T]): T = retrieve(key).get
def getOrElse[T](key: TraceLocalKey[T], code: Supplier[T]): T = retrieve(key).getOrElse(code.get)
def storeForMdc(key: String, value: String): Unit = store(AvailableToMdc.fromKey(key))(value)
def newTraceLocalKey[T]: TraceLocalKey[T] = new TraceLocalKey[T] {}
}
class TraceLocalStorage {
val underlyingStorage = TrieMap[TraceLocalKey[_], Any]()
def store[T](key: TraceLocalKey[T])(value: Any): Unit = underlyingStorage.put(key, value)
def retrieve[T](key: TraceLocalKey[T]): Option[T] = underlyingStorage.get(key).map(_.asInstanceOf[T])
}
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