def apply()

in server/src/main/scala/com/twitter/server/handler/ContentionHandler.scala [32:55]

• 22 lines of code
• 4 McCabe index (conditional complexity)

  def apply(req: Request): Future[Response] = {
    contentionSnapshot match {
      case Some(snapshot) =>
        val snap = snapshot.snap()
        val deadlockMsg =
          if (snap.deadlocks.isEmpty) ""
          else {
            "DEADLOCKS:\n\n%s\n\n".format(snap.deadlocks.mkString("\n\n"))
          }

        val msg = "%sBlocked:\n%s\n\nLock Owners:\n%s".format(
          deadlockMsg,
          snap.blockedThreads.mkString("\n"),
          snap.lockOwners.mkString("\n")
        )

        newOk(msg)
      case _ =>
        val msg =
          "Contention snapshotting is not enabled due to SecurityManager restrictions.\n" +
            "Please ensure that the java.lang.management.ManagementPermission(\"control\") is allowed."
        newOk(msg)
    }
  }