1 files changed, 96 insertions, 0 deletions
diff --git a/wsrep-lib/include/wsrep/key.hpp b/wsrep-lib/include/wsrep/key.hpp
new file mode 100644
index 00000000..85c266c6
--- /dev/null
+++ b/wsrep-lib/include/wsrep/key.hpp
@@ -0,0 +1,96 @@
+/*
+ * Copyright (C) 2018 Codership Oy <info@codership.com>
+ *
+ * This file is part of wsrep-lib.
+ *
+ * Wsrep-lib is free software: you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation, either version 2 of the License, or
+ * (at your option) any later version.
+ *
+ * Wsrep-lib is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with wsrep-lib.  If not, see <https://www.gnu.org/licenses/>.
+ */
+
+#ifndef WSREP_KEY_HPP
+#define WSREP_KEY_HPP
+
+#include "exception.hpp"
+#include "buffer.hpp"
+
+#include <iosfwd>
+
+namespace wsrep
+{
+    /** @class key
+     *
+     * Certification key type.
+     */
+    class key
+    {
+    public:
+        enum type
+        {
+            shared,
+            reference,
+            update,
+            exclusive
+        };
+
+        key(enum type type)
+            : type_(type)
+            , key_parts_()
+            , key_parts_len_()
+        { }
+
+        /**
+         * Append key part to key.
+         *
+         * @param ptr Pointer to key part data. The caller is supposed to take
+         *            care that the pointer remains valid over the lifetime
+         *            if the key object.
+         * @param len Length of the key part data.
+         */
+        void append_key_part(const void* ptr, size_t len)
+        {
+            if (key_parts_len_ == 3)
+            {
+                throw wsrep::runtime_error("key parts exceed maximum of 3");
+            }
+            key_parts_[key_parts_len_] = wsrep::const_buffer(ptr, len);
+            ++key_parts_len_;
+        }
+
+        enum type type() const
+        {
+            return type_;
+        }
+
+        size_t size() const
+        {
+            return key_parts_len_;
+        }
+
+        const wsrep::const_buffer* key_parts() const
+        {
+            return key_parts_;
+        }
+    private:
+
+        enum type type_;
+        wsrep::const_buffer key_parts_[3];
+        size_t key_parts_len_;
+    };
+
+    typedef std::vector<wsrep::key> key_array;
+
+    std::ostream& operator<<(std::ostream&, enum wsrep::key::type);
+    std::ostream& operator<<(std::ostream&, const wsrep::key&);
+}
+
+#endif // WSREP_KEY_HPP