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A SR transaction must be adopted by a storage service instance running in background rollbacker thread while it is aborting a SR transaction.
76 lines
2.1 KiB
C++
76 lines
2.1 KiB
C++
//
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// Copyright (C) 2018 Codership Oy <info@codership.com>
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//
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/** @file storage_service.hpp
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*
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* Abstract interface which defines required access to DBMS storage
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* service. The service is used for storing streaming replication
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* write set fragments into stable storage. The interface is used
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* from locally processing transaction context only. Corresponding
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* operations for high priority processing can be found from
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* wsrep::high_priority_service interface.
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*/
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#ifndef WSREP_STORAGE_SERVICE_HPP
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#define WSREP_STORAGE_SERVICE_HPP
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#include "transaction_id.hpp"
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#include "id.hpp"
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#include "buffer.hpp"
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namespace wsrep
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{
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// Forward declarations
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class ws_handle;
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class ws_meta;
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class transaction;
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/**
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* Storage service abstract interface.
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*/
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class storage_service
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{
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public:
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virtual ~storage_service() { }
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/**
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* Start a new transaction for storage access.
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*
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* @param[out] ws_handle Write set handle for a new transaction
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*
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* @return Zero in case of success, non-zero on error.
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*/
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virtual int start_transaction(const wsrep::ws_handle&) = 0;
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virtual void adopt_transaction(const wsrep::transaction&) = 0;
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/**
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* Append fragment into stable storage.
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*/
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virtual int append_fragment(const wsrep::id& server_id,
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wsrep::transaction_id client_id,
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int flags,
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const wsrep::const_buffer& data) = 0;
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/**
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* Update fragment meta data after certification process.
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*/
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virtual int update_fragment_meta(const wsrep::ws_meta&) = 0;
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/**
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* Commit the transaction.
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*/
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virtual int commit(const wsrep::ws_handle&, const wsrep::ws_meta&) = 0;
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/**
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* Roll back the transaction.
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*/
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virtual int rollback(const wsrep::ws_handle&,
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const wsrep::ws_meta&) = 0;
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virtual void store_globals() = 0;
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virtual void reset_globals() = 0;
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};
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}
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#endif // WSREP_STORAGE_SERVICE_HPP
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