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package kamon.context
class Context private (private[context] val entries: Map[Key[_], Any]) {
def get[T](key: Key[T]): T =
entries.get(key).getOrElse(key.emptyValue).asInstanceOf[T]
def withKey[T](key: Key[T], value: T): Context =
new Context(entries.updated(key, value))
}
object Context {
val Empty = new Context(Map.empty)
def apply(): Context =
Empty
def create(): Context =
Empty
def apply[T](key: Key[T], value: T): Context =
new Context(Map(key -> value))
def create[T](key: Key[T], value: T): Context =
apply(key, value)
}
trait Key[T] {
def name: String
def emptyValue: T
def broadcast: Boolean
}
object Key {
def local[T](name: String, emptyValue: T): Key[T] =
new Default[T](name, emptyValue, false)
def broadcast[T](name: String, emptyValue: T): Key[T] =
new Default[T](name, emptyValue, true)
private class Default[T](val name: String, val emptyValue: T, val broadcast: Boolean) extends Key[T] {
override def hashCode(): Int =
name.hashCode
override def equals(that: Any): Boolean =
that.isInstanceOf[Default[_]] && that.asInstanceOf[Default[_]].name == this.name
}
}
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