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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, Inc.
* Copyright (C) 2009-2010 Jay Pipes <jaypipes@gmail.com>
*
* Authors:
*
* Jay Pipes <jaypipes@gmail.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
*/
#pragma once
#include <drizzled/atomics.h>
#include <drizzled/plugin/replication.h>
#include <string>
#include <vector>
#include <utility>
#include <drizzled/visibility.h>
#include <drizzled/common_fwd.h>
static const char DEFAULT_USE_REPLICATOR[]= "default";
namespace drizzled {
/**
* This is a class which manages transforming internal
* transactional events into GPB messages and sending those
* events out through registered replicators and appliers.
*/
class DRIZZLED_API ReplicationServices
{
public:
typedef uint64_t GlobalTransactionId;
/**
* Types of messages that can go in the transaction
* log file. Every time something is written into the
* transaction log, it is preceded by a header containing
* the type of message which follows.
*/
enum MessageType
{
TRANSACTION= 1, /* A GPB Transaction Message */
BLOB= 2 /* A BLOB value */
};
typedef std::pair<plugin::TransactionReplicator *, plugin::TransactionApplier *> ReplicationPair;
typedef std::vector<ReplicationPair> ReplicationStreams;
/**
* Method which is called after plugins have been loaded but
* before the first client connects. It determines if the registration
* of applier and replicator plugins is proper and pairs
* the applier and requested replicator plugins into the replication
* streams.
*
* @todo
*
* This is only necessary because we don't yet have plugin dependency
* tracking...
*/
static bool evaluateRegisteredPlugins();
/**
* Helper method which pushes a constructed message out to the registered
* replicator and applier plugins.
*
* @param Session descriptor
* @param Message to push out
*/
static plugin::ReplicationReturnCode pushTransactionMessage(Session &in_session, message::Transaction &to_push);
/**
* Returns whether the ReplicationServices object
* is active. In other words, does it have both
* a replicator and an applier that are *active*?
*/
static bool isActive();
/**
* Returns the list of replication streams
*/
static ReplicationStreams &getReplicationStreams();
/**
* Attaches a replicator to our internal collection of
* replicators.
*
* @param Pointer to a replicator to attach/register
*/
static void attachReplicator(plugin::TransactionReplicator *in_replicator);
/**
* Detaches/unregisters a replicator with our internal
* collection of replicators.
*
* @param Pointer to the replicator to detach
*/
static void detachReplicator(plugin::TransactionReplicator *in_replicator);
/**
* Attaches a applier to our internal collection of
* appliers.
*
* @param Pointer to a applier to attach/register
* @param The name of the replicator to pair with
*/
static void attachApplier(plugin::TransactionApplier *in_applier, const std::string &requested_replicator);
/**
* Detaches/unregisters a applier with our internal
* collection of appliers.
*
* @param Pointer to the applier to detach
*/
static void detachApplier(plugin::TransactionApplier *in_applier);
/**
* Returns the timestamp of the last Transaction which was sent to an
* applier.
*/
static uint64_t getLastAppliedTimestamp();
};
} /* namespace drizzled */
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