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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
*/
/**
* @file Server-side utility which is responsible for managing the
* communication between the kernel and the replication plugins:
*
* - TransactionReplicator
* - TransactionApplier
* - Publisher
* - Subscriber
*
* ReplicationServices is a bridge between replication modules and the kernel,
* and its primary function is to */
#include "config.h"
#include "drizzled/replication_services.h"
#include "drizzled/plugin/transaction_replicator.h"
#include "drizzled/plugin/transaction_applier.h"
#include "drizzled/message/transaction.pb.h"
#include "drizzled/gettext.h"
#include "drizzled/session.h"
#include "drizzled/error.h"
#include <string>
#include <vector>
#include <algorithm>
using namespace std;
namespace drizzled
{
ReplicationServices::ReplicationServices() :
is_active(false)
{
}
void ReplicationServices::normalizeReplicatorName(string &name)
{
transform(name.begin(),
name.end(),
name.begin(),
::tolower);
if (name.find("replicator") == string::npos)
name.append("replicator", 10);
{
size_t found_underscore= name.find('_');
while (found_underscore != string::npos)
{
name.erase(found_underscore, 1);
found_underscore= name.find('_');
}
}
}
bool ReplicationServices::evaluateRegisteredPlugins()
{
/*
* We loop through appliers that have registered with us
* and attempts to pair the applier with its requested
* replicator. If an applier has requested a replicator
* that has either not been built or has not registered
* with the replication services, we print an error and
* return false
*/
if (appliers.empty())
return true;
if (replicators.empty() && not appliers.empty())
{
errmsg_printf(ERRMSG_LVL_ERROR,
N_("You registered a TransactionApplier plugin but no "
"TransactionReplicator plugins were registered.\n"));
return false;
}
for (Appliers::iterator appl_iter= appliers.begin();
appl_iter != appliers.end();
++appl_iter)
{
plugin::TransactionApplier *applier= (*appl_iter).second;
string requested_replicator_name= (*appl_iter).first;
normalizeReplicatorName(requested_replicator_name);
bool found= false;
Replicators::iterator repl_iter;
for (repl_iter= replicators.begin();
repl_iter != replicators.end();
++repl_iter)
{
string replicator_name= (*repl_iter)->getName();
normalizeReplicatorName(replicator_name);
if (requested_replicator_name.compare(replicator_name) == 0)
{
found= true;
break;
}
}
if (not found)
{
errmsg_printf(ERRMSG_LVL_ERROR,
N_("You registered a TransactionApplier plugin but no "
"TransactionReplicator plugins were registered that match the "
"requested replicator name of '%s'.\n"
"We have deactivated the TransactionApplier '%s'.\n"),
requested_replicator_name.c_str(),
applier->getName().c_str());
applier->deactivate();
return false;
}
else
{
replication_streams.push_back(make_pair(*repl_iter, applier));
}
}
is_active= true;
return true;
}
void ReplicationServices::attachReplicator(plugin::TransactionReplicator *in_replicator)
{
replicators.push_back(in_replicator);
}
void ReplicationServices::detachReplicator(plugin::TransactionReplicator *in_replicator)
{
replicators.erase(std::find(replicators.begin(), replicators.end(), in_replicator));
}
void ReplicationServices::attachApplier(plugin::TransactionApplier *in_applier, const string &requested_replicator_name)
{
appliers.push_back(make_pair(requested_replicator_name, in_applier));
}
void ReplicationServices::detachApplier(plugin::TransactionApplier *)
{
}
bool ReplicationServices::isActive() const
{
return is_active;
}
plugin::ReplicationReturnCode ReplicationServices::pushTransactionMessage(Session &in_session,
message::Transaction &to_push)
{
plugin::ReplicationReturnCode result= plugin::SUCCESS;
for (ReplicationStreams::iterator iter= replication_streams.begin();
iter != replication_streams.end();
++iter)
{
plugin::TransactionReplicator *cur_repl= (*iter).first;
plugin::TransactionApplier *cur_appl= (*iter).second;
result= cur_repl->replicate(cur_appl, in_session, to_push);
if (result == plugin::SUCCESS)
{
/*
* We update the timestamp for the last applied Transaction so that
* publisher plugins can ask the replication services when the
* last known applied Transaction was using the getLastAppliedTimestamp()
* method.
*/
last_applied_timestamp.fetch_and_store(to_push.transaction_context().end_timestamp());
}
else
return result;
}
return result;
}
ReplicationServices::ReplicationStreams &ReplicationServices::getReplicationStreams()
{
return replication_streams;
}
} /* namespace drizzled */
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