mirror of https://github.com/facebook/rocksdb.git
77 lines
2.4 KiB
C++
77 lines
2.4 KiB
C++
// Copyright (c) 2011-present, Facebook, Inc. All rights reserved.
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// This source code is licensed under both the GPLv2 (found in the
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// COPYING file in the root directory) and Apache 2.0 License
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// (found in the LICENSE.Apache file in the root directory).
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#pragma once
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#ifndef ROCKSDB_LITE
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#include "utilities/transactions/write_prepared_txn.h"
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#include "utilities/transactions/write_unprepared_txn_db.h"
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namespace rocksdb {
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class WriteUnpreparedTxnDB;
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class WriteUnpreparedTxn;
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class WriteUnpreparedTxnReadCallback : public ReadCallback {
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public:
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WriteUnpreparedTxnReadCallback(WritePreparedTxnDB* db,
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SequenceNumber snapshot,
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SequenceNumber min_uncommitted,
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WriteUnpreparedTxn* txn)
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: db_(db),
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snapshot_(snapshot),
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min_uncommitted_(min_uncommitted),
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txn_(txn) {}
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virtual bool IsVisible(SequenceNumber seq) override;
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virtual SequenceNumber MaxUnpreparedSequenceNumber() override;
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private:
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WritePreparedTxnDB* db_;
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SequenceNumber snapshot_;
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SequenceNumber min_uncommitted_;
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WriteUnpreparedTxn* txn_;
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};
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class WriteUnpreparedTxn : public WritePreparedTxn {
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public:
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WriteUnpreparedTxn(WriteUnpreparedTxnDB* db,
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const WriteOptions& write_options,
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const TransactionOptions& txn_options);
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virtual ~WriteUnpreparedTxn() {}
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// Get and GetIterator needs to be overridden so that a ReadCallback to
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// handle read-your-own-write is used.
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using Transaction::Get;
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virtual Status Get(const ReadOptions& options,
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ColumnFamilyHandle* column_family, const Slice& key,
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PinnableSlice* value) override;
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using Transaction::GetIterator;
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virtual Iterator* GetIterator(const ReadOptions& options) override;
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virtual Iterator* GetIterator(const ReadOptions& options,
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ColumnFamilyHandle* column_family) override;
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const std::map<SequenceNumber, size_t>& GetUnpreparedSequenceNumbers();
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private:
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friend class WriteUnpreparedTransactionTest_ReadYourOwnWrite_Test;
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WriteUnpreparedTxnDB* wupt_db_;
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// Ordered list of unprep_seq sequence numbers that we have already written
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// to DB.
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//
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// This maps unprep_seq => prepare_batch_cnt for each prepared batch written
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// by this transactioin.
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std::map<SequenceNumber, size_t> unprep_seqs_;
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};
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} // namespace rocksdb
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#endif // ROCKSDB_LITE
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