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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/two_level_iterator.h | |
parent | Initial commit. (diff) | |
download | ceph-e6918187568dbd01842d8d1d2c808ce16a894239.tar.xz ceph-e6918187568dbd01842d8d1d2c808ce16a894239.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/two_level_iterator.h | 43 |
1 files changed, 43 insertions, 0 deletions
diff --git a/src/rocksdb/table/two_level_iterator.h b/src/rocksdb/table/two_level_iterator.h new file mode 100644 index 000000000..1fed93417 --- /dev/null +++ b/src/rocksdb/table/two_level_iterator.h @@ -0,0 +1,43 @@ +// 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 "rocksdb/env.h" +#include "rocksdb/iterator.h" +#include "table/iterator_wrapper.h" + +namespace ROCKSDB_NAMESPACE { + +struct ReadOptions; +class InternalKeyComparator; + +// TwoLevelIteratorState expects iterators are not created using the arena +struct TwoLevelIteratorState { + TwoLevelIteratorState() {} + + virtual ~TwoLevelIteratorState() {} + virtual InternalIteratorBase<IndexValue>* NewSecondaryIterator( + const BlockHandle& handle) = 0; +}; + +// Return a new two level iterator. A two-level iterator contains an +// index iterator whose values point to a sequence of blocks where +// each block is itself a sequence of key,value pairs. The returned +// two-level iterator yields the concatenation of all key/value pairs +// in the sequence of blocks. Takes ownership of "index_iter" and +// will delete it when no longer needed. +// +// Uses a supplied function to convert an index_iter value into +// an iterator over the contents of the corresponding block. +// Note: this function expects first_level_iter was not created using the arena +extern InternalIteratorBase<IndexValue>* NewTwoLevelIterator( + TwoLevelIteratorState* state, + InternalIteratorBase<IndexValue>* first_level_iter); + +} // namespace ROCKSDB_NAMESPACE |