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Diffstat (limited to 'qpid/cpp/src/qpid/ha/StatusCheck.h')
-rw-r--r-- | qpid/cpp/src/qpid/ha/StatusCheck.h | 76 |
1 files changed, 76 insertions, 0 deletions
diff --git a/qpid/cpp/src/qpid/ha/StatusCheck.h b/qpid/cpp/src/qpid/ha/StatusCheck.h new file mode 100644 index 0000000000..087e586b2b --- /dev/null +++ b/qpid/cpp/src/qpid/ha/StatusCheck.h @@ -0,0 +1,76 @@ +#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/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 setPromote(bool p); + + sys::Mutex lock; + std::vector<sys::Thread> threads; + bool promote; + const Settings settings; + const sys::Duration heartbeat; + const BrokerInfo brokerInfo; + + friend class StatusCheckThread; +}; +}} // namespace qpid::ha + +#endif /*!QPID_HA_STATUSCHECK_H*/ |