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src/storage/ob_sstable_row_getter.cpp

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+/**
+ * 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 "ob_sstable_row_getter.h"
+using namespace oceanbase::common;
+using namespace oceanbase::blocksstable;
+
+namespace oceanbase {
+namespace storage {
+
+ObSSTableRowGetter::ObSSTableRowGetter() : ObSSTableRowIterator(), has_prefetched_(false)
+{}
+
+ObSSTableRowGetter::~ObSSTableRowGetter()
+{}
+
+int ObSSTableRowGetter::get_handle_cnt(const void* query_range, int64_t& read_handle_cnt, int64_t& micro_handle_cnt)
+{
+  int ret = OB_SUCCESS;
+  if (NULL == query_range) {
+    ret = OB_INVALID_ARGUMENT;
+    STORAGE_LOG(WARN, "Invalid argument, ", K(ret));
+  } else {
+    read_handle_cnt = 1;
+    micro_handle_cnt = 2;
+  }
+  return ret;
+}
+
+int ObSSTableRowGetter::prefetch_read_handle(ObSSTableReadHandle& read_handle)
+{
+  int ret = OB_SUCCESS;
+  if (has_prefetched_) {
+    ret = OB_ITER_END;
+  } else if (OB_FAIL(get_read_handle(*rowkey_, read_handle))) {
+    STORAGE_LOG(WARN, "Fail to get read handle, ", K(ret), K(*rowkey_));
+  } else {
+    read_handle.range_idx_ = 0;
+    has_prefetched_ = true;
+  }
+  return ret;
+}
+
+int ObSSTableRowGetter::fetch_row(ObSSTableReadHandle& read_handle, const ObStoreRow*& store_row)
+{
+  return get_row(read_handle, store_row);
+}
+
+void ObSSTableRowGetter::reset()
+{
+  ObSSTableRowIterator::reset();
+  has_prefetched_ = false;
+}
+
+void ObSSTableRowGetter::reuse()
+{
+  ObSSTableRowIterator::reuse();
+  has_prefetched_ = false;
+}
+
+int ObSSTableRowGetter::get_range_count(const void* query_range, int64_t& range_count) const
+{
+  int ret = OB_SUCCESS;
+  UNUSED(query_range);
+  range_count = 1;
+  return ret;
+}
+
+}  // namespace storage
+}  // namespace oceanbase