//  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 <string>

#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, 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_;
  }

 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);
};

}  //  namespace rocksdb
#endif  // ROCKSDB_LITE