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https://github.com/codership/wsrep-lib.git
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5ea78de6c2
- Add a set_provider_factory() method to server_state to allow injecting provider factory which will be called when the provider is loaded. Other related changes: - Implement to_string() helper method for id class. - Fix id ostream operator human readable id printing. - Pass victim client_service as an argument to provider::bf_abort() to allow passing victim context to custom provider. - Implement prev() helper method for seqno class. - Make server_state recover_streaming_appliers_if_not_recovered() public. In some recovery scenarios the method must be called outside of server_state internal code paths. - Add storage_service requires_globals() method. The storage service implementation may override this to return false if changing to storage service context does not require store/reset globals. - Change view final() to also require that the view status is not primary for the view to be final. Also change the method name to is_final() to avoid confusion with C++ final identifier. - Fixes to server state handling in disconnecting and disconnected states. - Keep TOI meta data over whole TOI critical section. Co-authored-by: Denis Protivensky <denis.protivensky@galeracluster.com>
110 lines
3.4 KiB
C++
110 lines
3.4 KiB
C++
/*
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* Copyright (C) 2018 Codership Oy <info@codership.com>
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*
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* This file is part of wsrep-lib.
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*
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* Wsrep-lib is free software: you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation, either version 2 of the License, or
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* (at your option) any later version.
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*
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* Wsrep-lib is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with wsrep-lib. If not, see <https://www.gnu.org/licenses/>.
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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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#include "xid.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,
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const wsrep::xid& xid) = 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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* Remove fragments from storage. The storage service must have
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* adopted a transaction prior this call.
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*/
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virtual int remove_fragments() = 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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* Return true if the implementation requires storing
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* and restoring global state. Return true by default
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* since this is the original behavior. Stateless
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* implementations may override.
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*/
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virtual bool requires_globals() const {
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return true;
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}
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};
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}
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#endif // WSREP_STORAGE_SERVICE_HPP
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