1 files changed, 111 insertions, 0 deletions
diff --git a/wsrep-lib/include/wsrep/xid.hpp b/wsrep-lib/include/wsrep/xid.hpp
new file mode 100644
index 00000000..c500d63b
--- /dev/null
+++ b/wsrep-lib/include/wsrep/xid.hpp
@@ -0,0 +1,111 @@
+/*
+ * Copyright (C) 2019 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_XID_HPP
+#define WSREP_XID_HPP
+
+#include <iosfwd>
+#include "buffer.hpp"
+#include "exception.hpp"
+
+namespace wsrep
+{
+    class xid
+    {
+    public:
+        xid()
+            : format_id_(-1)
+            , gtrid_len_(0)
+            , bqual_len_(0)
+            , data_()
+        { }
+
+        xid(long format_id, long gtrid_len,
+            long bqual_len, const char* data)
+            : format_id_(format_id)
+            , gtrid_len_(gtrid_len)
+            , bqual_len_(bqual_len)
+            , data_()
+        {
+            if (gtrid_len_ > 64 || bqual_len_ > 64)
+            {
+                throw wsrep::runtime_error("maximum wsrep::xid size exceeded");
+            }
+            const long len = gtrid_len_ + bqual_len_;
+            if (len > 0)
+            {
+                data_.push_back(data, data + len);
+            }
+        }
+
+        xid(const xid& xid)
+            : format_id_(xid.format_id_)
+            , gtrid_len_(xid.gtrid_len_)
+            , bqual_len_(xid.bqual_len_)
+            , data_(xid.data_)
+        { }
+
+        bool is_null() const
+        {
+            return format_id_ == -1;
+        }
+
+        void clear()
+        {
+            format_id_ = -1;
+            gtrid_len_ = 0;
+            bqual_len_ = 0;
+            data_.clear();
+        }
+
+        xid& operator= (const xid& other)
+        {
+            format_id_ = other.format_id_;
+            gtrid_len_ = other.gtrid_len_;
+            bqual_len_ = other.bqual_len_;
+            data_ = other.data_;
+            return *this;
+        }
+
+        bool operator==(const xid& other) const
+        {
+            if (format_id_ != other.format_id_ ||
+                gtrid_len_ != other.gtrid_len_ ||
+                bqual_len_ != other.bqual_len_ ||
+                data_.size() != other.data_.size())
+            {
+                return false;
+            }
+            return data_ == other.data_;
+        }
+
+        friend std::string to_string(const wsrep::xid& xid);
+        friend std::ostream& operator<<(std::ostream& os, const wsrep::xid& xid);
+    protected:
+        long format_id_;
+        long gtrid_len_;
+        long bqual_len_;
+        mutable_buffer data_;
+    };
+
+    std::string to_string(const wsrep::xid& xid);
+    std::ostream& operator<<(std::ostream& os, const wsrep::xid& xid);
+}
+
+#endif // WSREP_XID_HPP