From 19fcec84d8d7d21e796c7624e521b60d28ee21ed Mon Sep 17 00:00:00 2001
From: Daniel Baumann <daniel.baumann@progress-linux.org>
Date: Sun, 7 Apr 2024 20:45:59 +0200
Subject: Adding upstream version 16.2.11+ds.

Signed-off-by: Daniel Baumann <daniel.baumann@progress-linux.org>
---
 .../utilities/transactions/write_prepared_txn.h    | 119 +++++++++++++++++++++
 1 file changed, 119 insertions(+)
 create mode 100644 src/rocksdb/utilities/transactions/write_prepared_txn.h

(limited to 'src/rocksdb/utilities/transactions/write_prepared_txn.h')

diff --git a/src/rocksdb/utilities/transactions/write_prepared_txn.h b/src/rocksdb/utilities/transactions/write_prepared_txn.h
new file mode 100644
index 000000000..30d9bdb99
--- /dev/null
+++ b/src/rocksdb/utilities/transactions/write_prepared_txn.h
@@ -0,0 +1,119 @@
+// 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
+
+#ifndef ROCKSDB_LITE
+
+#include <algorithm>
+#include <atomic>
+#include <mutex>
+#include <stack>
+#include <string>
+#include <unordered_map>
+#include <vector>
+
+#include "db/write_callback.h"
+#include "rocksdb/db.h"
+#include "rocksdb/slice.h"
+#include "rocksdb/snapshot.h"
+#include "rocksdb/status.h"
+#include "rocksdb/types.h"
+#include "rocksdb/utilities/transaction.h"
+#include "rocksdb/utilities/transaction_db.h"
+#include "rocksdb/utilities/write_batch_with_index.h"
+#include "util/autovector.h"
+#include "utilities/transactions/pessimistic_transaction.h"
+#include "utilities/transactions/pessimistic_transaction_db.h"
+#include "utilities/transactions/transaction_base.h"
+#include "utilities/transactions/transaction_util.h"
+
+namespace ROCKSDB_NAMESPACE {
+
+class WritePreparedTxnDB;
+
+// This impl could write to DB also uncommitted data and then later tell apart
+// committed data from uncommitted data. Uncommitted data could be after the
+// Prepare phase in 2PC (WritePreparedTxn) or before that
+// (WriteUnpreparedTxnImpl).
+class WritePreparedTxn : public PessimisticTransaction {
+ public:
+  WritePreparedTxn(WritePreparedTxnDB* db, const WriteOptions& write_options,
+                   const TransactionOptions& txn_options);
+  // No copying allowed
+  WritePreparedTxn(const WritePreparedTxn&) = delete;
+  void operator=(const WritePreparedTxn&) = delete;
+
+  virtual ~WritePreparedTxn() {}
+
+  // To make WAL commit markers visible, the snapshot will be based on the last
+  // seq in the WAL that is also published, LastPublishedSequence, as opposed to
+  // the last seq in the memtable.
+  using Transaction::Get;
+  virtual Status Get(const ReadOptions& options,
+                     ColumnFamilyHandle* column_family, const Slice& key,
+                     PinnableSlice* value) override;
+
+  using Transaction::MultiGet;
+  virtual void MultiGet(const ReadOptions& options,
+                        ColumnFamilyHandle* column_family,
+                        const size_t num_keys, const Slice* keys,
+                        PinnableSlice* values, Status* statuses,
+                        const bool sorted_input = false) override;
+
+  // Note: The behavior is undefined in presence of interleaved writes to the
+  // same transaction.
+  // To make WAL commit markers visible, the snapshot will be
+  // based on the last seq in the WAL that is also published,
+  // LastPublishedSequence, as opposed to the last seq in the memtable.
+  using Transaction::GetIterator;
+  virtual Iterator* GetIterator(const ReadOptions& options) override;
+  virtual Iterator* GetIterator(const ReadOptions& options,
+                                ColumnFamilyHandle* column_family) override;
+
+  virtual void SetSnapshot() override;
+
+ protected:
+  void Initialize(const TransactionOptions& txn_options) override;
+  // Override the protected SetId to make it visible to the friend class
+  // WritePreparedTxnDB
+  inline void SetId(uint64_t id) override { Transaction::SetId(id); }
+
+ private:
+  friend class WritePreparedTransactionTest_BasicRecoveryTest_Test;
+  friend class WritePreparedTxnDB;
+  friend class WriteUnpreparedTxnDB;
+  friend class WriteUnpreparedTxn;
+
+  Status PrepareInternal() override;
+
+  Status CommitWithoutPrepareInternal() override;
+
+  Status CommitBatchInternal(WriteBatch* batch, size_t batch_cnt) override;
+
+  // Since the data is already written to memtables at the Prepare phase, the
+  // commit entails writing only a commit marker in the WAL. The sequence number
+  // of the commit marker is then the commit timestamp of the transaction. To
+  // make WAL commit markers visible, the snapshot will be based on the last seq
+  // in the WAL that is also published, LastPublishedSequence, as opposed to the
+  // last seq in the memtable.
+  Status CommitInternal() override;
+
+  Status RollbackInternal() override;
+
+  virtual Status ValidateSnapshot(ColumnFamilyHandle* column_family,
+                                  const Slice& key,
+                                  SequenceNumber* tracked_at_seq) override;
+
+  virtual Status RebuildFromWriteBatch(WriteBatch* src_batch) override;
+
+  WritePreparedTxnDB* wpt_db_;
+  // Number of sub-batches in prepare
+  size_t prepare_batch_cnt_ = 0;
+};
+
+}  // namespace ROCKSDB_NAMESPACE
+
+#endif  // ROCKSDB_LITE
-- 
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