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/*
* Copyright (C) 2018 Codership Oy <info@codership.com>
*
* This file is part of wsrep-lib.
*
* Wsrep-lib is free software: you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation, either version 2 of the License, or
* (at your option) any later version.
*
* Wsrep-lib is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with wsrep-lib. If not, see <https://www.gnu.org/licenses/>.
*/
/** @file storage_service.hpp
*
* Abstract interface which defines required access to DBMS storage
* service. The service is used for storing streaming replication
* write set fragments into stable storage. The interface is used
* from locally processing transaction context only. Corresponding
* operations for high priority processing can be found from
* wsrep::high_priority_service interface.
*/
#ifndef WSREP_STORAGE_SERVICE_HPP
#define WSREP_STORAGE_SERVICE_HPP
#include "transaction_id.hpp"
#include "id.hpp"
#include "buffer.hpp"
#include "xid.hpp"
namespace wsrep
{
// Forward declarations
class ws_handle;
class ws_meta;
class transaction;
/**
* Storage service abstract interface.
*/
class storage_service
{
public:
virtual ~storage_service() { }
/**
* Start a new transaction for storage access.
*
* @param[out] ws_handle Write set handle for a new transaction
*
* @return Zero in case of success, non-zero on error.
*/
virtual int start_transaction(const wsrep::ws_handle&) = 0;
virtual void adopt_transaction(const wsrep::transaction&) = 0;
/**
* Append fragment into stable storage.
*/
virtual int append_fragment(const wsrep::id& server_id,
wsrep::transaction_id client_id,
int flags,
const wsrep::const_buffer& data,
const wsrep::xid& xid) = 0;
/**
* Update fragment meta data after certification process.
*/
virtual int update_fragment_meta(const wsrep::ws_meta&) = 0;
/**
* Remove fragments from storage. The storage service must have
* adopted a transaction prior this call.
*/
virtual int remove_fragments() = 0;
/**
* Commit the transaction.
*/
virtual int commit(const wsrep::ws_handle&, const wsrep::ws_meta&) = 0;
/**
* Roll back the transaction.
*/
virtual int rollback(const wsrep::ws_handle&,
const wsrep::ws_meta&) = 0;
virtual void store_globals() = 0;
virtual void reset_globals() = 0;
};
}
#endif // WSREP_STORAGE_SERVICE_HPP
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