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/* Copyright (c) 2007 MySQL AB, 2009 Sun Microsystems, Inc.
Use is subject to license terms.
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
/**
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 pthread_mutex_t err_lock;
/**
Constructor.
@param thread_name Printable name of the slave thread that is reporting.
*/
Slave_reporting_capability(char const *thread_name)
: m_thread_name(thread_name)
{
pthread_mutex_init(&err_lock, MY_MUTEX_INIT_FAST);
}
/**
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 *msg, ...) const
ATTRIBUTE_FORMAT(printf, 4, 5);
/**
Clear errors. They will not show up under <code>SHOW SLAVE
STATUS</code>.
*/
void clear_error() {
pthread_mutex_lock(&err_lock);
m_last_error.clear();
pthread_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
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