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/* - mode: c; c-basic-offset: 2; indent-tabs-mode: nil; -*-
* vim:expandtab:shiftwidth=2:tabstop=2:smarttab:
*
* Copyright (C) 2011 David Shrewsbury
*
* 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; either version 2 of the License, or
* (at your option) any later version.
*
* 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
*/
#pragma once
#include <plugin/slave/queue_consumer.h>
#include <plugin/slave/queue_producer.h>
#include <plugin/slave/replication_schema.h>
#include <drizzled/plugin/daemon.h>
#include <boost/thread.hpp>
namespace drizzled
{
class Session;
}
namespace slave
{
class ReplicationSlave : public drizzled::plugin::Daemon
{
public:
ReplicationSlave(const std::string &config)
: drizzled::plugin::Daemon("Replication Slave"),
_config_file(config),
_initial_max_commit_id(0)
{}
~ReplicationSlave()
{
_consumer_thread.interrupt();
_producer_thread.interrupt();
}
void startup(drizzled::Session &session);
/**
* Get the error message describing what went wrong during setup.
*/
const std::string &getError() const
{
return _error;
}
/**
* Set the initial value for the slave's maximum commit ID.
*
* This value basically determines where to start retrieving events from
* the master. Normally this is computed automatically based on the
* contents of the queue and/or the last applied commit ID. This allows
* us to override those values and start from another point. E.g., new
* slave provisioning or skipping a trouble statement.
*
* @param[in] value The commit ID value.
*/
void setMaxCommitId(uint64_t value)
{
/* must tell producer to set its cached value */
_producer.setCachedMaxCommitId(value);
/* setting this indicates that we should store it permanently */
_initial_max_commit_id= value;
}
private:
std::string _config_file;
std::string _error;
QueueConsumer _consumer;
QueueProducer _producer;
/** Applier thread that will drain the work queue */
boost::thread _consumer_thread;
/** I/O thread that will populate the work queue */
boost::thread _producer_thread;
uint64_t _initial_max_commit_id;
/**
* Initialize slave services with the given configuration file.
*
* In case of an error during initialization, you can call the getError()
* method to get a string describing what went wrong.
*
* @retval true Success
* @retval false Failure
*/
bool initWithConfig();
};
} /* namespace slave */
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