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88 lines
2.5 KiB
C++
88 lines
2.5 KiB
C++
// Copyright (c) 2011-present, Facebook, Inc. All rights reserved.
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// This source code is licensed under the BSD-style license found in the
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// LICENSE file in the root directory of this source tree. An additional grant
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// of patent rights can be found in the PATENTS file in the same 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 OptimisticTransactionImpl : public TransactionBaseImpl {
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public:
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OptimisticTransactionImpl(OptimisticTransactionDB* db,
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const WriteOptions& write_options,
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const OptimisticTransactionOptions& txn_options);
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virtual ~OptimisticTransactionImpl();
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Status Commit() override;
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void Rollback() 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 untracked = false) override;
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private:
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OptimisticTransactionDB* const txn_db_;
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friend class OptimisticTransactionCallback;
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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* column_family,
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const Slice& key) override {
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// Nothing to unlock.
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}
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// No copying allowed
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OptimisticTransactionImpl(const OptimisticTransactionImpl&);
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void operator=(const OptimisticTransactionImpl&);
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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(OptimisticTransactionImpl* 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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OptimisticTransactionImpl* txn_;
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};
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} // namespace rocksdb
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#endif // ROCKSDB_LITE
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