+ /**
+ * List all keys matching search glob-style pattern under the namespace.
+ *
+ * Supported glob-style patterns:
+ * h?llo matches hello, hallo and hxllo
+ * h*llo matches hllo and heeeello
+ * h[ae]llo matches hello and hallo, but not hillo
+ * h[^e]llo matches hallo, hbllo, ... but not hello
+ * h[a-b]llo matches hallo and hbllo
+ *
+ * The \ escapes character(s) in key search pattern and those will be treated as a normal
+ * character(s):
+ * h\[?llo\* matches h[ello* and h[allo*
+ *
+ * @param ns Namespace under which this operation is targeted.
+ * @param pattern Find keys matching a given glob-style pattern.
+ * @param findKeysAck The acknowledgement to be called once the request has been handled.
+ * The given function is called in the context of handleEvents() function.
+ */
+ virtual void listKeys(const Namespace& ns,
+ const std::string& pattern,
+ const FindKeysAck& findKeysAck) = 0;
+