hold_transactions.h

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/* Copyright (c) 2018, 2023, 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.
 
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   This program is distributed in the hope that it will be useful,
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   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
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   Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301  USA */
 
#ifndef HOLD_TRANSACTIONS_INCLUDE
#define HOLD_TRANSACTIONS_INCLUDE
 
#include "my_inttypes.h"
#include "sql/sql_class.h"
 
/**
  @class Hold_transactions
  Class that contains the logic to hold transactions when
  group_replication_consistency is set to BEFORE_ON_PRIMARY_FAILOVER
*/
 
class Hold_transactions {
 public:
  /**
    Class constructor for hold transaction logic
  */
  Hold_transactions();
 
  /**
    Class destructor for hold transaction logic
  */
  ~Hold_transactions();
 
  /**
    Method to enable the hold of transactions when a primary election is
    occurring
  */
  void enable();
 
  /**
    Method to resume transactions on hold, primary election ended
    */
  void disable();
 
  /**
    Method to wait for a primary failover to be complete
 
      @param hold_timeout seconds to abort wait
 
      @return the operation status
          @retval 0       if success
          @retval !=0     mysqld error code
  */
  int wait_until_primary_failover_complete(ulong hold_timeout);
 
 private:
  /**
    Method to verify if thread is killed
  */
  bool is_thread_killed() {
    return current_thd != nullptr && current_thd->is_killed();
  }
 
  /** is plugin currently applying backlog */
  bool applying_backlog = false;
 
  /** protect and notify changes on applying_backlog */
  mysql_mutex_t primary_promotion_policy_mutex;
  mysql_cond_t primary_promotion_policy_condition;
};
 
#endif /* HOLD_TRANSACTIONS_INCLUDE */