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rocksdb/utilities/transactions/transaction_db_impl.h

98 lines
3.6 KiB

// Copyright (c) 2015, Facebook, Inc. All rights reserved.
// This source code is licensed under the BSD-style license found in the
// LICENSE file in the root directory of this source tree. An additional grant
// of patent rights can be found in the PATENTS file in the same directory.
#pragma once
#ifndef ROCKSDB_LITE
#include <mutex>
#include <string>
#include <unordered_map>
#include "rocksdb/db.h"
#include "rocksdb/options.h"
#include "rocksdb/utilities/transaction_db.h"
#include "utilities/transactions/transaction_impl.h"
#include "utilities/transactions/transaction_lock_mgr.h"
namespace rocksdb {
class TransactionDBImpl : public TransactionDB {
public:
explicit TransactionDBImpl(DB* db,
const TransactionDBOptions& txn_db_options);
~TransactionDBImpl() {}
Transaction* BeginTransaction(const WriteOptions& write_options,
const TransactionOptions& txn_options) override;
using StackableDB::Put;
virtual Status Put(const WriteOptions& options,
ColumnFamilyHandle* column_family, const Slice& key,
const Slice& val) override;
using StackableDB::Delete;
virtual Status Delete(const WriteOptions& wopts,
ColumnFamilyHandle* column_family,
const Slice& key) override;
using StackableDB::Merge;
virtual Status Merge(const WriteOptions& options,
ColumnFamilyHandle* column_family, const Slice& key,
const Slice& value) override;
using StackableDB::Write;
virtual Status Write(const WriteOptions& opts, WriteBatch* updates) override;
using StackableDB::CreateColumnFamily;
virtual Status CreateColumnFamily(const ColumnFamilyOptions& options,
const std::string& column_family_name,
ColumnFamilyHandle** handle) override;
using StackableDB::DropColumnFamily;
virtual Status DropColumnFamily(ColumnFamilyHandle* column_family) override;
Status TryLock(TransactionImpl* txn, uint32_t cfh_id, const std::string& key);
void UnLock(TransactionImpl* txn, const TransactionKeyMap* keys);
void UnLock(TransactionImpl* txn, uint32_t cfh_id, const std::string& key);
void AddColumnFamily(const ColumnFamilyHandle* handle);
static TransactionDBOptions ValidateTxnDBOptions(
const TransactionDBOptions& txn_db_options);
const TransactionDBOptions& GetTxnDBOptions() const {
return txn_db_options_;
}
void InsertExpirableTransaction(TransactionID tx_id, TransactionImpl* tx);
void RemoveExpirableTransaction(TransactionID tx_id);
// If transaction is no longer available, locks can be stolen
// If transaction is available, try stealing locks directly from transaction
// It is the caller's responsibility to ensure that the referred transaction
// is expirable (GetExpirationTime() > 0) and that it is expired.
bool TryStealingExpiredTransactionLocks(TransactionID tx_id);
private:
const TransactionDBOptions txn_db_options_;
TransactionLockMgr lock_mgr_;
// Must be held when adding/dropping column families.
InstrumentedMutex column_family_mutex_;
Transaction* BeginInternalTransaction(const WriteOptions& options);
Status WriteHelper(WriteBatch* updates, TransactionImpl* txn_impl);
// Used to ensure that no locks are stolen from an expirable transaction
// that has started a commit. Only transactions with an expiration time
// should be in this map.
std::mutex map_mutex_;
std::unordered_map<TransactionID, TransactionImpl*>
expirable_transactions_map_;
};
} // namespace rocksdb
#endif // ROCKSDB_LITE