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Diffstat (limited to 'qpid/cpp/src/qpid/client/FailoverListener.h')
-rw-r--r-- | qpid/cpp/src/qpid/client/FailoverListener.h | 88 |
1 files changed, 88 insertions, 0 deletions
diff --git a/qpid/cpp/src/qpid/client/FailoverListener.h b/qpid/cpp/src/qpid/client/FailoverListener.h new file mode 100644 index 0000000000..53c7c26211 --- /dev/null +++ b/qpid/cpp/src/qpid/client/FailoverListener.h @@ -0,0 +1,88 @@ +#ifndef QPID_CLIENT_FAILOVERLISTENER_H +#define QPID_CLIENT_FAILOVERLISTENER_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 "qpid/client/ClientImportExport.h" +#include "qpid/client/MessageListener.h" +#include "qpid/client/Connection.h" +#include "qpid/client/Session.h" +#include "qpid/client/SubscriptionManager.h" +#include "qpid/Url.h" +#include "qpid/sys/Mutex.h" +#include "qpid/sys/Runnable.h" +#include "qpid/sys/Thread.h" +#include <vector> + +namespace qpid { +namespace client { + + +/** + * Listen for updates from the amq.failover exchange. + * + * In a cluster, the amq.failover exchange provides updates whenever + * the cluster membership changes. This class subscribes to the + * failover exchange and providees the latest list of known brokers. + * + * You can also subscribe to amq.failover yourself and use + * FailoverListener::decode to extract a list of broker URLs from a + * failover exchange message. + */ +class QPID_CLIENT_CLASS_EXTERN FailoverListener : private MessageListener, private qpid::sys::Runnable +{ + public: + /** The name of the standard failover exchange amq.failover */ + static QPID_CLIENT_EXTERN const std::string AMQ_FAILOVER; + + /** Extract the broker list from a failover exchange message */ + static QPID_CLIENT_EXTERN std::vector<Url> getKnownBrokers(const Message& m); + + /** Subscribe to amq.failover exchange. */ + QPID_CLIENT_EXTERN FailoverListener(Connection); + + /** Subscribe to amq.failover exchange. + *@param useInitial If true use the connection's initial brokers as + * the initial value of getKnownBrokers + */ + QPID_CLIENT_EXTERN FailoverListener(Connection, bool useInitial); + + QPID_CLIENT_EXTERN ~FailoverListener(); + + /** Returns the latest list of known broker URLs. */ + QPID_CLIENT_EXTERN std::vector<Url> getKnownBrokers() const; + + private: + void received(Message& msg); + void run(); + void init(bool); + + mutable sys::Mutex lock; + Connection connection; + Session session; + SubscriptionManager subscriptions; + sys::Thread thread; + std::vector<Url> knownBrokers; +}; +}} // namespace qpid::client + +#endif /*!QPID_CLIENT_FAILOVERLISTENER_H*/ |