diff --git a/source/dlog/nu/core.d b/source/dlog/nu/core.d
new file mode 100644
index 0000000..ddce1f6
--- /dev/null
+++ b/source/dlog/nu/core.d
@@ -0,0 +1,38 @@
+module dlog.nu.core;
+
+public class Message
+{
+
+}
+
+public interface Filter
+{
+    public bool filter(Message message);
+}
+
+public interface MessageTransform
+{
+    public Message transform(Message message);
+}
+
+public interface Handler
+{
+    public void handle(Message message);
+}
+
+import std.container.slist : SList;
+// import std.range : in;
+import core.sync.mutex : Mutex;
+
+public abstract class Logger
+{
+    private SList!(MessageTransform) transforms;
+    private SList!(Filter) filters;
+    private SList!(Handler) handlers;
+    private Mutex lock; // Lock for attached handlers, filters and transforms
+
+    this()
+    {
+        this.lock = new Mutex();
+    }
+}
\ No newline at end of file