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/* Copyright (c) 2016, 2025, Oracle and/or its affiliates.
This program is free software; you can redistribute it and/or modify
it under the terms of the GNU General Public License, version 2.0,
as published by the Free Software Foundation.
This program is designed to work with certain software (including
but not limited to OpenSSL) that is licensed under separate terms,
as designated in a particular file or component or in included license
documentation. The authors of MySQL hereby grant you an additional
permission to link the program and your derivative works with the
separately licensed software that they have either included with
the program or referenced in the documentation.
This program 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, version 2.0, for more details.
You should have received a copy of the GNU General Public License
along with this program; if not, write to the Free Software
Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA */
#ifndef GCS_VIEW_MODIFICATION_NOTIFIER_INCLUDE
#define GCS_VIEW_MODIFICATION_NOTIFIER_INCLUDE
#include "plugin/group_replication/include/plugin_constants.h"
#include "plugin/group_replication/include/plugin_server_include.h"
/*
@class Plugin_gcs_view_modification_notifier
This class is used with the purpose of issuing a view changing event
and wait for its completion.
*/
class Plugin_gcs_view_modification_notifier {
public:
Plugin_gcs_view_modification_notifier();
virtual ~Plugin_gcs_view_modification_notifier();
/**
Signals that a view modification is about to start
*/
void start_view_modification();
/**
Checks if there is a view modification ongoing.
@retval true there is a view modification ongoing
@retval false otherwise
*/
bool is_view_modification_ongoing();
/**
Signals that a view modification has ended
*/
void end_view_modification();
/**
Signals that a view modification has been cancelled
@param[in] errnr error that did cause the view modification to
be cancelled
*/
void cancel_view_modification(
int errnr = GROUP_REPLICATION_CONFIGURATION_ERROR);
/**
Check if view modification was cancelled.
This method must only be called after view modification is complete.
@retval true view modification was cancelled
@retval false otherwise
*/
bool is_cancelled();
/**
Method in which one waits for the view modification to end
@param[in] timeout how long one wants to wait, in seconds
@return Operation status
@retval false OK
@retval true error (timeout or view modification cancelled)
*/
bool wait_for_view_modification(long timeout = VIEW_MODIFICATION_TIMEOUT);
/**
Get the error number that did happen on view modification.
This method must only be called after view modification is complete.
@return Operation
@retval 0 OK (no error)
@retval >0 error number
*/
int get_error();
private:
bool view_changing;
bool cancelled_view_change;
int error;
mysql_cond_t wait_for_view_cond;
mysql_mutex_t wait_for_view_mutex;
};
#endif /* GCS_VIEW_MODIFICATION_NOTIFIER_INCLUDE */
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