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Filename : rpl_reporting.h
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/* Copyright (c) 2006, 2010, Oracle and/or its affiliates. All rights reserved.

   This program is free software; you can redistribute it and/or modify
   it under the terms of the GNU General Public License as published by
   the Free Software Foundation; version 2 of the License.

   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 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 RPL_REPORTING_H
#define RPL_REPORTING_H

#include "my_sys.h"                             /* loglevel */

/**
   Maximum size of an error message from a slave thread.
 */
#define MAX_SLAVE_ERRMSG      1024

/**
   Mix-in to handle the message logging and reporting for relay log
   info and master log info structures.

   By inheriting from this class, the class is imbued with
   capabilities to do slave reporting.
 */
class Slave_reporting_capability
{
public:
  /** lock used to synchronize m_last_error on 'SHOW SLAVE STATUS' **/
  mutable mysql_mutex_t err_lock;
  /**
     Constructor.

     @param thread_name Printable name of the slave thread that is reporting.
   */
  Slave_reporting_capability(char const *thread_name);

  /**
     Writes a message and, if it's an error message, to Last_Error
     (which will be displayed by SHOW SLAVE STATUS).

     @param level       The severity level
     @param err_code    The error code
     @param msg         The message (usually related to the error
                        code, but can contain more information), in
                        printf() format.
  */
  void report(loglevel level, int err_code, const char *extra_info,
              const char *msg, ...) const
    ATTRIBUTE_FORMAT(printf, 5, 6);

  /**
     Clear errors. They will not show up under <code>SHOW SLAVE
     STATUS</code>.
   */
  void clear_error() {
    mysql_mutex_lock(&err_lock);
    m_last_error.clear();
    mysql_mutex_unlock(&err_lock);
  }

  /**
     Error information structure.
   */
  class Error {
    friend class Slave_reporting_capability;
  public:
    Error()
    {
      clear();
    }

    void clear()
    {
      number= 0;
      message[0]= '\0';
    }

    /** Error code */
    uint32 number;
    /** Error message */
    char message[MAX_SLAVE_ERRMSG];
  };

  Error const& last_error() const { return m_last_error; }

  virtual ~Slave_reporting_capability()= 0;
private:
  /**
     Last error produced by the I/O or SQL thread respectively.
   */
  mutable Error m_last_error;

  char const *const m_thread_name;

  // not implemented
  Slave_reporting_capability(const Slave_reporting_capability& rhs);
  Slave_reporting_capability& operator=(const Slave_reporting_capability& rhs);
};

#endif // RPL_REPORTING_H