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#ifndef QPID_HA_PRIMARY_H
#define QPID_HA_PRIMARY_H
/*
*
* Licensed to the Apache Software Foundation (ASF) under one
* or more contributor license agreements. See the NOTICE file
* distributed with this work for additional information
* regarding copyright ownership. The ASF licenses this file
* to you under the Apache License, Version 2.0 (the
* "License"); you may not use this file except in compliance
* with the License. You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing,
* software distributed under the License is distributed on an
* "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
* KIND, either express or implied. See the License for the
* specific language governing permissions and limitations
* under the License.
*
*/
#include "types.h"
#include "BrokerInfo.h"
#include "qpid/sys/Mutex.h"
#include <boost/shared_ptr.hpp>
#include <boost/intrusive_ptr.hpp>
#include <map>
#include <string>
namespace qpid {
namespace broker {
class Queue;
class Connection;
class ConnectionObserver;
class ConfigurationObserver;
}
namespace sys {
class TimerTask;
}
namespace ha {
class HaBroker;
class ReplicatingSubscription;
class RemoteBackup;
class QueueGuard;
/**
* State associated with a primary broker:
* - sets queue guards and tracks readiness of initial backups till active.
* - sets queue guards on new queues for each backup.
*
* THREAD SAFE: called concurrently in arbitrary connection threads.
*/
class Primary
{
public:
typedef boost::shared_ptr<broker::Queue> QueuePtr;
static Primary* get() { return instance; }
Primary(HaBroker& hb, const BrokerInfo::Set& expectedBackups);
~Primary();
void readyReplica(const ReplicatingSubscription&);
void removeReplica(const std::string& q);
// Called via ConfigurationObserver
void queueCreate(const QueuePtr&);
void queueDestroy(const QueuePtr&);
// Called via ConnectionObserver
void opened(broker::Connection& connection);
void closed(broker::Connection& connection);
boost::shared_ptr<QueueGuard> getGuard(const QueuePtr& q, const BrokerInfo&);
// Called in timer thread when the deadline for expected backups expires.
void timeoutExpectedBackups();
private:
typedef std::map<types::Uuid, boost::shared_ptr<RemoteBackup> > BackupMap;
typedef std::set<boost::shared_ptr<RemoteBackup> > BackupSet;
void checkReady(sys::Mutex::ScopedLock&);
void checkReady(BackupMap::iterator, sys::Mutex::ScopedLock&);
sys::Mutex lock;
HaBroker& haBroker;
std::string logPrefix;
bool active;
/**
* Set of expected backups that must be ready before we declare ourselves
* active
*/
BackupSet expectedBackups;
/**
* Map of all the remote backups we know about: any expected backups plus
* all actual backups that have connected. We do not remove entries when a
* backup disconnects. @see Primary::closed()
*/
BackupMap backups;
boost::shared_ptr<broker::ConnectionObserver> connectionObserver;
boost::shared_ptr<broker::ConfigurationObserver> configurationObserver;
boost::intrusive_ptr<sys::TimerTask> timerTask;
static Primary* instance;
};
}} // namespace qpid::ha
#endif /*!QPID_HA_PRIMARY_H*/
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