add ObExtraMediumInfo and remove redundant code

src/storage/compaction/ob_extra_medium_info.cpp

@@ -0,0 +1,94 @@
+/**
+ * Copyright (c) 2021 OceanBase
+ * OceanBase CE is licensed under Mulan PubL v2.
+ * You can use this software according to the terms and conditions of the Mulan PubL v2.
+ * You may obtain a copy of Mulan PubL v2 at:
+ *          http://license.coscl.org.cn/MulanPubL-2.0
+ * THIS SOFTWARE IS PROVIDED ON AN "AS IS" BASIS, WITHOUT WARRANTIES OF ANY KIND,
+ * EITHER EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO NON-INFRINGEMENT,
+ * MERCHANTABILITY OR FIT FOR A PARTICULAR PURPOSE.
+ * See the Mulan PubL v2 for more details.
+ */
+
+#include "storage/compaction/ob_extra_medium_info.h"
+#include "lib/oblog/ob_log_module.h"
+#include "lib/utility/ob_macro_utils.h"
+
+using namespace oceanbase::common;
+
+namespace oceanbase
+{
+namespace compaction
+{
+ObExtraMediumInfo::ObExtraMediumInfo()
+  : compat_(MEDIUM_LIST_VERSION),
+    last_compaction_type_(0),
+    wait_check_flag_(0),
+    reserved_(0),
+    last_medium_scn_(0)
+{
+}
+
+ObExtraMediumInfo::ObExtraMediumInfo(const ObExtraMediumInfo &other)
+{
+  if (this != &other) {
+    compat_ = other.compat_;
+    last_compaction_type_ = other.last_compaction_type_;
+    wait_check_flag_ = other.wait_check_flag_;
+    reserved_ = other.reserved_;
+    last_medium_scn_ = other.last_medium_scn_;
+  }
+}
+
+ObExtraMediumInfo &ObExtraMediumInfo::operator=(const ObExtraMediumInfo &other)
+{
+  if (this != &other) {
+    compat_ = other.compat_;
+    last_compaction_type_ = other.last_compaction_type_;
+    wait_check_flag_ = other.wait_check_flag_;
+    reserved_ = other.reserved_;
+    last_medium_scn_ = other.last_medium_scn_;
+  }
+  return *this;
+}
+
+void ObExtraMediumInfo::reset()
+{
+  compat_ = MEDIUM_LIST_VERSION;
+  last_compaction_type_ = 0;
+  wait_check_flag_ = 0;
+  reserved_ = 0;
+  last_medium_scn_ = 0;
+}
+
+int ObExtraMediumInfo::serialize(char *buf, const int64_t buf_len, int64_t &pos) const
+{
+  int ret = OB_SUCCESS;
+  LST_DO_CODE(OB_UNIS_ENCODE,
+      info_,
+      last_medium_scn_);
+
+  return ret;
+}
+
+int ObExtraMediumInfo::deserialize(const char *buf, const int64_t data_len, int64_t &pos)
+{
+  int ret = OB_SUCCESS;
+  LST_DO_CODE(OB_UNIS_DECODE,
+      info_,
+      last_medium_scn_);
+
+  return ret;
+}
+
+int64_t ObExtraMediumInfo::get_serialize_size() const
+{
+  int64_t len = 0;
+  LST_DO_CODE(OB_UNIS_ADD_LEN,
+      info_,
+      last_medium_scn_);
+
+  return len;
+}
+} // namespace compaction
+} // namespace oceanbase