1 files changed, 74 insertions, 0 deletions
diff --git a/src/rocksdb/table/block_based/binary_search_index_reader.cc b/src/rocksdb/table/block_based/binary_search_index_reader.cc
new file mode 100644
index 000000000..21787cc1a
--- /dev/null
+++ b/src/rocksdb/table/block_based/binary_search_index_reader.cc
@@ -0,0 +1,74 @@
+//  Copyright (c) 2011-present, Facebook, Inc.  All rights reserved.
+//  This source code is licensed under both the GPLv2 (found in the
+//  COPYING file in the root directory) and Apache 2.0 License
+//  (found in the LICENSE.Apache file in the root directory).
+//
+// Copyright (c) 2011 The LevelDB Authors. All rights reserved.
+// Use of this source code is governed by a BSD-style license that can be
+// found in the LICENSE file. See the AUTHORS file for names of contributors.
+#include "table/block_based/binary_search_index_reader.h"
+
+namespace ROCKSDB_NAMESPACE {
+Status BinarySearchIndexReader::Create(
+    const BlockBasedTable* table, const ReadOptions& ro,
+    FilePrefetchBuffer* prefetch_buffer, bool use_cache, bool prefetch,
+    bool pin, BlockCacheLookupContext* lookup_context,
+    std::unique_ptr<IndexReader>* index_reader) {
+  assert(table != nullptr);
+  assert(table->get_rep());
+  assert(!pin || prefetch);
+  assert(index_reader != nullptr);
+
+  CachableEntry<Block> index_block;
+  if (prefetch || !use_cache) {
+    const Status s =
+        ReadIndexBlock(table, prefetch_buffer, ro, use_cache,
+                       /*get_context=*/nullptr, lookup_context, &index_block);
+    if (!s.ok()) {
+      return s;
+    }
+
+    if (use_cache && !pin) {
+      index_block.Reset();
+    }
+  }
+
+  index_reader->reset(
+      new BinarySearchIndexReader(table, std::move(index_block)));
+
+  return Status::OK();
+}
+
+InternalIteratorBase<IndexValue>* BinarySearchIndexReader::NewIterator(
+    const ReadOptions& read_options, bool /* disable_prefix_seek */,
+    IndexBlockIter* iter, GetContext* get_context,
+    BlockCacheLookupContext* lookup_context) {
+  const BlockBasedTable::Rep* rep = table()->get_rep();
+  const bool no_io = (read_options.read_tier == kBlockCacheTier);
+  CachableEntry<Block> index_block;
+  const Status s =
+      GetOrReadIndexBlock(no_io, read_options.rate_limiter_priority,
+                          get_context, lookup_context, &index_block);
+  if (!s.ok()) {
+    if (iter != nullptr) {
+      iter->Invalidate(s);
+      return iter;
+    }
+
+    return NewErrorInternalIterator<IndexValue>(s);
+  }
+
+  Statistics* kNullStats = nullptr;
+  // We don't return pinned data from index blocks, so no need
+  // to set `block_contents_pinned`.
+  auto it = index_block.GetValue()->NewIndexIterator(
+      internal_comparator()->user_comparator(),
+      rep->get_global_seqno(BlockType::kIndex), iter, kNullStats, true,
+      index_has_first_key(), index_key_includes_seq(), index_value_is_full());
+
+  assert(it != nullptr);
+  index_block.TransferTo(it);
+
+  return it;
+}
+}  // namespace ROCKSDB_NAMESPACE