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#ifndef QPID_HA_STATUSCHECK_H
#define QPID_HA_STATUSCHECK_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 "BrokerInfo.h"
#include "Settings.h"
#include "qpid/Url.h"
#include "qpid/sys/AtomicValue.h"
#include "qpid/sys/Thread.h"
#include "qpid/sys/Mutex.h"
#include "qpid/sys/Runnable.h"
#include "qpid/sys/Time.h"
#include <vector>
namespace qpid {
namespace ha {
class HaBroker;
// TODO aconway 2012-12-21: This solution is incomplete. It will only protect
// against bad promotion if there are READY brokers when this broker starts.
// It will not help the situation where brokers became READY after this one starts.
//
/**
* Check whether a JOINING broker can be promoted .
*
* A JOINING broker can be promoted as long as all the other brokers are also
* JOINING. If there are READY brokers in the cluster the JOINING broker should
* refuse to promote so that one of the READY brokers can. This situation
* only comes about if the primary is dead and no new primary has been promoted.
*
* THREAD SAFE: setUrl and canPromote are called in arbitrary management threads.
*/
class StatusCheck
{
public:
StatusCheck(HaBroker&);
~StatusCheck();
void setUrl(const Url&);
bool canPromote();
private:
void noPromote();
void endThread();
sys::Mutex lock;
std::vector<sys::Thread> threads;
sys::AtomicValue<int> threadCount;
bool promote;
const Settings settings;
const sys::Duration heartbeat;
const BrokerInfo brokerInfo;
friend class StatusCheckThread;
};
}} // namespace qpid::ha
#endif /*!QPID_HA_STATUSCHECK_H*/
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