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// 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 "rocksdb/types.h"
#include "rocksdb/utilities/transaction.h"
#include "rocksdb/utilities/transaction_db.h"
#include "utilities/transactions/lock/lock_tracker.h"
#include "utilities/transactions/pessimistic_transaction.h"
namespace ROCKSDB_NAMESPACE {
class PessimisticTransactionDB;
class LockManager {
public:
virtual ~LockManager() {}
// Whether supports locking a specific key.
virtual bool IsPointLockSupported() const = 0;
// Whether supports locking a range of keys.
virtual bool IsRangeLockSupported() const = 0;
// Locks acquired through this LockManager should be tracked by
// the LockTrackers created through the returned factory.
virtual const LockTrackerFactory& GetLockTrackerFactory() const = 0;
// Enable locking for the specified column family.
// Caller should guarantee that this column family is not already enabled.
virtual void AddColumnFamily(const ColumnFamilyHandle* cf) = 0;
// Disable locking for the specified column family.
// Caller should guarantee that this column family is no longer used.
virtual void RemoveColumnFamily(const ColumnFamilyHandle* cf) = 0;
// Attempt to lock a key or a key range. If OK status is returned, the caller
// is responsible for calling UnLock() on this key.
virtual Status TryLock(PessimisticTransaction* txn,
ColumnFamilyId column_family_id,
const std::string& key, Env* env, bool exclusive) = 0;
// The range [start, end] are inclusive at both sides.
virtual Status TryLock(PessimisticTransaction* txn,
ColumnFamilyId column_family_id, const Endpoint& start,
const Endpoint& end, Env* env, bool exclusive) = 0;
// Unlock a key or a range locked by TryLock(). txn must be the same
// Transaction that locked this key.
virtual void UnLock(PessimisticTransaction* txn, const LockTracker& tracker,
Env* env) = 0;
virtual void UnLock(PessimisticTransaction* txn,
ColumnFamilyId column_family_id, const std::string& key,
Env* env) = 0;
virtual void UnLock(PessimisticTransaction* txn,
ColumnFamilyId column_family_id, const Endpoint& start,
const Endpoint& end, Env* env) = 0;
using PointLockStatus = std::unordered_multimap<ColumnFamilyId, KeyLockInfo>;
virtual PointLockStatus GetPointLockStatus() = 0;
using RangeLockStatus =
std::unordered_multimap<ColumnFamilyId, RangeLockInfo>;
virtual RangeLockStatus GetRangeLockStatus() = 0;
virtual std::vector<DeadlockPath> GetDeadlockInfoBuffer() = 0;
virtual void Resize(uint32_t new_size) = 0;
};
// LockManager should always be constructed through this factory method,
// instead of constructing through concrete implementations' constructor.
// Caller owns the returned pointer.
std::shared_ptr<LockManager> NewLockManager(PessimisticTransactionDB* db,
const TransactionDBOptions& opt);
} // namespace ROCKSDB_NAMESPACE
#endif // ROCKSDB_LITE
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