service_rpl_transaction_write_set.h

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/* Copyright (c) 2014, 2025, Oracle and/or its affiliates.
 
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   it under the terms of the GNU General Public License, version 2.0,
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#ifndef MYSQL_SERVICE_TRANSACTION_WRITE_SET_INCLUDED
 
/**
  @file include/mysql/service_rpl_transaction_write_set.h
  This service provides a function for plugins to get the write set of a given
  transaction.
 
  SYNOPSIS
  get_transaction_write_set()
    This service is used to fetch the write_set extracted for the currently
    executing transaction by passing the thread_id as an input parameter for
    the method.
 
    @param [in] - thread_id - It is the thread identifier of the currently
                              executing thread.
 
    In the current implementation it is being called during RUN_HOOK macro,
    on which we know that thread is on plugin context.
 
  Cleanup :
    The service caller must take of the memory allocated during the service
    call to prevent memory leaks.
*/
 
#ifndef MYSQL_ABI_CHECK
#include <stdlib.h>
#endif
 
/**
  This structure is used to keep the list of the hash values of the records
  changed in the transaction.
*/
struct Transaction_write_set {
  unsigned int m_flags;           // reserved
  unsigned long write_set_size;   // Size of the PKE set of the transaction.
  unsigned long long *write_set;  // A pointer to the PKE set.
};
 
extern "C" struct transaction_write_set_service_st {
  Transaction_write_set *(*get_transaction_write_set)(
      unsigned long m_thread_id);
  void (*require_full_write_set)(bool requires_ws);
  void (*set_write_set_memory_size_limit)(uint64 size_limit);
  void (*update_write_set_memory_size_limit)(uint64 size_limit);
} *transaction_write_set_service;
 
#ifdef MYSQL_DYNAMIC_PLUGIN
 
#define get_transaction_write_set(m_thread_id) \
  transaction_write_set_service->get_transaction_write_set(m_thread_id)
#define require_full_write_set(requires_ws) \
  transaction_write_set_service->require_full_write_set(requires_ws)
#define set_write_set_memory_size_limit(size_limit) \
  transaction_write_set_service->set_write_set_memory_size_limit(size_limit)
#define update_write_set_memory_size_limit(size_limit) \
  transaction_write_set_service->update_write_set_memory_size_limit(size_limit)
 
#else
 
Transaction_write_set *get_transaction_write_set(unsigned long m_thread_id);
 
void require_full_write_set(bool requires_ws);
 
void set_write_set_memory_size_limit(uint64 size_limit);
 
void update_write_set_memory_size_limit(uint64 size_limit);
 
#endif
 
#define MYSQL_SERVICE_TRANSACTION_WRITE_SET_INCLUDED
#endif