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author | Daniel Baumann <daniel.baumann@progress-linux.org> | 2024-04-21 11:54:28 +0000 |
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committer | Daniel Baumann <daniel.baumann@progress-linux.org> | 2024-04-21 11:54:28 +0000 |
commit | e6918187568dbd01842d8d1d2c808ce16a894239 (patch) | |
tree | 64f88b554b444a49f656b6c656111a145cbbaa28 /src/rocksdb/table/block_based/index_reader_common.h | |
parent | Initial commit. (diff) | |
download | ceph-b26c4052f3542036551aa9dec9caa4226e456195.tar.xz ceph-b26c4052f3542036551aa9dec9caa4226e456195.zip |
Adding upstream version 18.2.2.upstream/18.2.2
Signed-off-by: Daniel Baumann <daniel.baumann@progress-linux.org>
Diffstat (limited to '')
-rw-r--r-- | src/rocksdb/table/block_based/index_reader_common.h | 85 |
1 files changed, 85 insertions, 0 deletions
diff --git a/src/rocksdb/table/block_based/index_reader_common.h b/src/rocksdb/table/block_based/index_reader_common.h new file mode 100644 index 000000000..5627b0eeb --- /dev/null +++ b/src/rocksdb/table/block_based/index_reader_common.h @@ -0,0 +1,85 @@ +// 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. +#pragma once + +#include "table/block_based/block_based_table_reader.h" +#include "table/block_based/reader_common.h" + +namespace ROCKSDB_NAMESPACE { +// Encapsulates common functionality for the various index reader +// implementations. Provides access to the index block regardless of whether +// it is owned by the reader or stored in the cache, or whether it is pinned +// in the cache or not. +class BlockBasedTable::IndexReaderCommon : public BlockBasedTable::IndexReader { + public: + IndexReaderCommon(const BlockBasedTable* t, + CachableEntry<Block>&& index_block) + : table_(t), index_block_(std::move(index_block)) { + assert(table_ != nullptr); + } + + protected: + static Status ReadIndexBlock(const BlockBasedTable* table, + FilePrefetchBuffer* prefetch_buffer, + const ReadOptions& read_options, bool use_cache, + GetContext* get_context, + BlockCacheLookupContext* lookup_context, + CachableEntry<Block>* index_block); + + const BlockBasedTable* table() const { return table_; } + + const InternalKeyComparator* internal_comparator() const { + assert(table_ != nullptr); + assert(table_->get_rep() != nullptr); + + return &table_->get_rep()->internal_comparator; + } + + bool index_has_first_key() const { + assert(table_ != nullptr); + assert(table_->get_rep() != nullptr); + return table_->get_rep()->index_has_first_key; + } + + bool index_key_includes_seq() const { + assert(table_ != nullptr); + assert(table_->get_rep() != nullptr); + return table_->get_rep()->index_key_includes_seq; + } + + bool index_value_is_full() const { + assert(table_ != nullptr); + assert(table_->get_rep() != nullptr); + return table_->get_rep()->index_value_is_full; + } + + bool cache_index_blocks() const { + assert(table_ != nullptr); + assert(table_->get_rep() != nullptr); + return table_->get_rep()->table_options.cache_index_and_filter_blocks; + } + + Status GetOrReadIndexBlock(bool no_io, Env::IOPriority rate_limiter_priority, + GetContext* get_context, + BlockCacheLookupContext* lookup_context, + CachableEntry<Block>* index_block) const; + + size_t ApproximateIndexBlockMemoryUsage() const { + assert(!index_block_.GetOwnValue() || index_block_.GetValue() != nullptr); + return index_block_.GetOwnValue() + ? index_block_.GetValue()->ApproximateMemoryUsage() + : 0; + } + + private: + const BlockBasedTable* table_; + CachableEntry<Block> index_block_; +}; + +} // namespace ROCKSDB_NAMESPACE |