9eb3e1f77d
Summary: Use delete to disable automatic generated methods instead of private, and put the constructor together for more clear.This modification cause the unused field warning, so add unused attribute to disable this warning. Pull Request resolved: https://github.com/facebook/rocksdb/pull/5009 Differential Revision: D17288733 fbshipit-source-id: 8a767ce096f185f1db01bd28fc88fef1cdd921f3
98 lines
2.9 KiB
C++
98 lines
2.9 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 <stack>
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#include <string>
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#include <unordered_map>
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#include <vector>
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#include "db/write_callback.h"
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#include "rocksdb/db.h"
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#include "rocksdb/slice.h"
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#include "rocksdb/snapshot.h"
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#include "rocksdb/status.h"
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#include "rocksdb/types.h"
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#include "rocksdb/utilities/transaction.h"
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#include "rocksdb/utilities/optimistic_transaction_db.h"
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#include "rocksdb/utilities/write_batch_with_index.h"
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#include "utilities/transactions/transaction_base.h"
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#include "utilities/transactions/transaction_util.h"
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namespace rocksdb {
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class OptimisticTransaction : public TransactionBaseImpl {
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public:
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OptimisticTransaction(OptimisticTransactionDB* db,
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const WriteOptions& write_options,
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const OptimisticTransactionOptions& txn_options);
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// No copying allowed
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OptimisticTransaction(const OptimisticTransaction&) = delete;
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void operator=(const OptimisticTransaction&) = delete;
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virtual ~OptimisticTransaction();
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void Reinitialize(OptimisticTransactionDB* txn_db,
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const WriteOptions& write_options,
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const OptimisticTransactionOptions& txn_options);
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Status Prepare() override;
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Status Commit() override;
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Status Rollback() override;
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Status SetName(const TransactionName& name) override;
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protected:
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Status TryLock(ColumnFamilyHandle* column_family, const Slice& key,
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bool read_only, bool exclusive, const bool do_validate = true,
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const bool assume_tracked = false) override;
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private:
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ROCKSDB_FIELD_UNUSED OptimisticTransactionDB* const txn_db_;
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friend class OptimisticTransactionCallback;
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void Initialize(const OptimisticTransactionOptions& txn_options);
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// Returns OK if it is safe to commit this transaction. Returns Status::Busy
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// if there are read or write conflicts that would prevent us from committing
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// OR if we can not determine whether there would be any such conflicts.
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//
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// Should only be called on writer thread.
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Status CheckTransactionForConflicts(DB* db);
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void Clear() override;
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void UnlockGetForUpdate(ColumnFamilyHandle* /* unused */,
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const Slice& /* unused */) override {
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// Nothing to unlock.
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}
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};
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// Used at commit time to trigger transaction validation
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class OptimisticTransactionCallback : public WriteCallback {
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public:
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explicit OptimisticTransactionCallback(OptimisticTransaction* txn)
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: txn_(txn) {}
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Status Callback(DB* db) override {
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return txn_->CheckTransactionForConflicts(db);
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}
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bool AllowWriteBatching() override { return false; }
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private:
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OptimisticTransaction* txn_;
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};
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} // namespace rocksdb
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#endif // ROCKSDB_LITE
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