1 files changed, 50 insertions, 0 deletions
diff --git a/kamon-core/src/main/scala/kamon/context/Context.scala b/kamon-core/src/main/scala/kamon/context/Context.scala
new file mode 100644
index 00000000..f8a4662f
--- /dev/null
+++ b/kamon-core/src/main/scala/kamon/context/Context.scala
@@ -0,0 +1,50 @@
+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
+  }
+}
+\ No newline at end of file