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author | Daniel Baumann <daniel.baumann@progress-linux.org> | 2024-04-07 18:45:59 +0000 |
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committer | Daniel Baumann <daniel.baumann@progress-linux.org> | 2024-04-07 18:45:59 +0000 |
commit | 19fcec84d8d7d21e796c7624e521b60d28ee21ed (patch) | |
tree | 42d26aa27d1e3f7c0b8bd3fd14e7d7082f5008dc /src/rocksdb/db/read_callback.h | |
parent | Initial commit. (diff) | |
download | ceph-19fcec84d8d7d21e796c7624e521b60d28ee21ed.tar.xz ceph-19fcec84d8d7d21e796c7624e521b60d28ee21ed.zip |
Adding upstream version 16.2.11+ds.upstream/16.2.11+dsupstream
Signed-off-by: Daniel Baumann <daniel.baumann@progress-linux.org>
Diffstat (limited to 'src/rocksdb/db/read_callback.h')
-rw-r--r-- | src/rocksdb/db/read_callback.h | 53 |
1 files changed, 53 insertions, 0 deletions
diff --git a/src/rocksdb/db/read_callback.h b/src/rocksdb/db/read_callback.h new file mode 100644 index 000000000..fbef1dd0d --- /dev/null +++ b/src/rocksdb/db/read_callback.h @@ -0,0 +1,53 @@ +// 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). + +#pragma once + +#include "rocksdb/types.h" + +namespace ROCKSDB_NAMESPACE { + +class ReadCallback { + public: + ReadCallback(SequenceNumber last_visible_seq) + : max_visible_seq_(last_visible_seq) {} + ReadCallback(SequenceNumber last_visible_seq, SequenceNumber min_uncommitted) + : max_visible_seq_(last_visible_seq), min_uncommitted_(min_uncommitted) {} + + virtual ~ReadCallback() {} + + // Will be called to see if the seq number visible; if not it moves on to + // the next seq number. + virtual bool IsVisibleFullCheck(SequenceNumber seq) = 0; + + inline bool IsVisible(SequenceNumber seq) { + assert(min_uncommitted_ > 0); + assert(min_uncommitted_ >= kMinUnCommittedSeq); + if (seq < min_uncommitted_) { // handles seq == 0 as well + assert(seq <= max_visible_seq_); + return true; + } else if (max_visible_seq_ < seq) { + assert(seq != 0); + return false; + } else { + assert(seq != 0); // already handled in the first if-then clause + return IsVisibleFullCheck(seq); + } + } + + inline SequenceNumber max_visible_seq() { return max_visible_seq_; } + + // Refresh to a more recent visible seq + virtual void Refresh(SequenceNumber seq) { max_visible_seq_ = seq; } + + protected: + // The max visible seq, it is usually the snapshot but could be larger if + // transaction has its own writes written to db. + SequenceNumber max_visible_seq_ = kMaxSequenceNumber; + // Any seq less than min_uncommitted_ is committed. + const SequenceNumber min_uncommitted_ = kMinUnCommittedSeq; +}; + +} // namespace ROCKSDB_NAMESPACE |