1 files changed, 18 insertions, 0 deletions
diff --git a/src/common/config_tracker.h b/src/common/config_tracker.h
new file mode 100644
index 000000000..783e6f2ee
--- /dev/null
+++ b/src/common/config_tracker.h
@@ -0,0 +1,18 @@
+// -*- mode:C++; tab-width:8; c-basic-offset:2; indent-tabs-mode:t -*-
+
+#pragma once
+
+#include <string>
+
+// @ConfigTracker is queried to see if any added observers is tracking one or
+// more changed settings.
+//
+// this class is introduced in hope to decouple @c md_config_t from any instantiated
+// class of @c ObserverMgr, as what the former wants is but @c is_tracking(), and to
+// make ObserverMgr a template parameter of md_config_t's methods just complicates
+// the dependencies between header files, and slows down the compiling.
+class ConfigTracker {
+public:
+  virtual ~ConfigTracker() = default;
+  virtual bool is_tracking(const std::string& name) const = 0;
+};