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/* -*- mode: c++; c-basic-offset: 2; indent-tabs-mode: nil; -*-
* vim:expandtab:shiftwidth=2:tabstop=2:smarttab:
*
* Copyright (C) 2008-2009 Sun Microsystems
*
* Authors:
*
* Jay Pipes <joinfu@sun.com>
*
* 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 DRIZZLED_PLUGIN_COMMAND_REPLICATOR_H
#define DRIZZLED_PLUGIN_COMMAND_REPLICATOR_H
/**
* @file Defines the API for a CommandReplicator.
*
* All a replicator does is replicate/reproduce
* events, optionally transforming them before sending them off to a CommandApplier.
*
* An applier is responsible for applying events, not a replicator...
*/
/* some forward declarations needed */
namespace drizzled
{
namespace message
{
class Command;
}
}
namespace drizzled
{
namespace plugin
{
class CommandApplier;
/**
* Class which replicates Command messages
*/
class CommandReplicator
{
public:
CommandReplicator() {}
virtual ~CommandReplicator() {}
/**
* Replicate a Command message to a CommandApplier.
*
* @note
*
* It is important to note that memory allocation for the
* supplied pointer is not guaranteed after the completion
* of this function -- meaning the caller can dispose of the
* supplied message. Therefore, replicators and appliers
* implementing an asynchronous replication system must copy
* the supplied message to their own controlled memory storage
* area.
*
* @param Pointer to the applier of the command message
* @param Command message to be replicated
*/
virtual void replicate(CommandApplier *in_applier, drizzled::message::Command &to_replicate)= 0;
/**
* A replicator plugin should override this with its
* internal method for determining if it is active or not.
*/
virtual bool isActive() {return false;}
};
} /* end namespace drizzled::plugin */
} /* end namespace drizzled */
#endif /* DRIZZLED_PLUGIN_COMMAND_REPLICATOR_H */
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