--- /dev/null
+
+#ifndef ROLE_SELECTOR_H_
+#define ROLE_SELECTOR_H_
+
+#include <string>
+#include <vector>
+#include "mds/mdstypes.h"
+#include "mds/FSMap.h"
+
+/**
+ * When you want to let the user act on a single rank in a namespace,
+ * or all of them.
+ */
+class MDSRoleSelector
+{
+ public:
+ const std::vector<mds_role_t> &get_roles() const {return roles;}
+ int parse(const FSMap &fsmap, std::string const &str);
+ MDSRoleSelector()
+ : fscid(FS_CLUSTER_ID_NONE)
+ {}
+ fs_cluster_id_t get_ns() const
+ {
+ return fscid;
+ }
+ protected:
+ int parse_rank(
+ const FSMap &fsmap,
+ std::string const &str);
+ std::vector<mds_role_t> roles;
+ fs_cluster_id_t fscid;
+};
+
+#endif // ROLE_SELECTOR_H_
+