mirror of
https://github.com/codership/wsrep-lib.git
synced 2025-06-10 05:41:42 +03:00
138 lines
3.6 KiB
C++
138 lines
3.6 KiB
C++
//
|
|
// Copyright (C) 2018 Codership Oy <info@codership.com>
|
|
//
|
|
|
|
/*! \file client_service.hpp
|
|
*
|
|
* This file will define a `callback` abstract interface for a
|
|
* DBMS client session service. The interface will define methods
|
|
* which will be called by the wsrep-lib under certain circumstances,
|
|
* for example when a transaction rollback is required by internal
|
|
* wsrep-lib operation or applier client needs to apply a write set.
|
|
*
|
|
* \todo Figure out better name for this interface.
|
|
*/
|
|
|
|
namespace wsrep
|
|
{
|
|
class client_service
|
|
{
|
|
public:
|
|
virtual bool is_autocommit() const = 0;
|
|
/*!
|
|
* Return true if two pahase commit is required for transaction
|
|
* to commit.
|
|
*/
|
|
virtual bool do_2pc() const = 0;
|
|
|
|
/*!
|
|
* Return true if the current transaction has been interrupted.
|
|
*/
|
|
virtual bool interrupted() const = 0;
|
|
|
|
/*!
|
|
* Reset possible global or thread local parameters associated
|
|
* to the thread.
|
|
*/
|
|
virtual void reset_globals() = 0;
|
|
|
|
/*!
|
|
* Store possible global or thread local parameters associated
|
|
* to the thread.
|
|
*/
|
|
virtual void store_globals() = 0;
|
|
|
|
/*!
|
|
* Set up a data for replication.
|
|
*/
|
|
virtual int prepare_data_for_replication(wsrep::data& data) = 0;
|
|
|
|
|
|
/*!
|
|
* Apply a write set.
|
|
*/
|
|
virtual int apply() = 0;
|
|
|
|
/*!
|
|
* Prepare a transaction for commit.
|
|
*/
|
|
virtual int prepare() = 0;
|
|
|
|
/*!
|
|
* Commit transaction.
|
|
*/
|
|
virtual int commit() = 0;
|
|
|
|
/*!
|
|
* Roll back transaction.
|
|
*/
|
|
virtual int rollback() = 0;
|
|
|
|
/*!
|
|
* Forcefully shut down the DBMS process or replication system.
|
|
* This may be called in situations where
|
|
* the process may encounter a situation where data integrity
|
|
* may not be guaranteed or other unrecoverable condition is
|
|
* encontered.
|
|
*/
|
|
virtual void emergency_shutdown() = 0;
|
|
|
|
// Replaying
|
|
/*!
|
|
* Notify that the client will replay.
|
|
*
|
|
* \todo This should not be visible to DBMS level, should be
|
|
* handled internally by wsrep-lib.
|
|
*/
|
|
virtual void will_replay() = 0;
|
|
|
|
/*!
|
|
* Replay the current transaction. The implementation must put
|
|
* the caller Client Context into applying mode and call
|
|
* client_context::replay().
|
|
*
|
|
* \todo This should not be visible to DBMS level, should be
|
|
* handled internally by wsrep-lib.
|
|
*/
|
|
virtual int replay() = 0;
|
|
|
|
/*!
|
|
* Wait until all replaying transactions have been finished
|
|
* replaying.
|
|
*
|
|
* \todo This should not be visible to DBMS level, should be
|
|
* handled internally by wsrep-lib.
|
|
*/
|
|
virtual void wait_for_replayers() = 0;
|
|
|
|
// Streaming replication
|
|
/*!
|
|
* Append a write set fragment into fragment storage.
|
|
*/
|
|
virtual int append_fragment() = 0;
|
|
};
|
|
|
|
/*!
|
|
* Debug callback methods. These methods are called only in
|
|
* builds that have WITH_DEBUG defined.
|
|
*/
|
|
class client_debug_callback
|
|
{
|
|
public:
|
|
/*!
|
|
* Enter debug sync point.
|
|
*
|
|
* @params sync_point Name of the debug sync point.
|
|
*/
|
|
void debug_sync(const char* sync_point) = 0;
|
|
|
|
/*!
|
|
* Forcefully kill the process if the suicide_point has
|
|
* been enabled.
|
|
*/
|
|
void debug_suicide(const char* suicide_point) = 0;
|
|
};
|
|
|
|
|
|
}
|