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https://github.com/Telecominfraproject/wlan-cloud-lib-cppkafka.git
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98 lines
3.2 KiB
C++
98 lines
3.2 KiB
C++
/*
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* Copyright (c) 2016, Matias Fontanini
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* All rights reserved.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions are
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* met:
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*
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* * Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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* * Redistributions in binary form must reproduce the above
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* copyright notice, this list of conditions and the following disclaimer
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* in the documentation and/or other materials provided with the
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* distribution.
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*
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* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
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* "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
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* LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
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* A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
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* OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
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* SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
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* LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
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* DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
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* THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
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* (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
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* OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
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*
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*/
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#ifndef CPPKAFKA_ZOOKEEPER_POOL_H
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#define CPPKAFKA_ZOOKEEPER_POOL_H
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#include <map>
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#include <string>
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#include <chrono>
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#include <mutex>
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#include "zookeeper/zookeeper_watcher.h"
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namespace cppkafka {
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class ZookeeperSubscription;
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/**
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* \brief Pool of zookeeper handles
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*
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* This class is used internally by cppkafka.
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*/
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class ZookeeperPool {
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public:
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/**
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* Get singleton instance
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*/
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static ZookeeperPool& instance();
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/**
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* Subscribe to the given endpoint
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*
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* \param endpoint The zookeeper endpoint to subscribe to
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* \param receive_timeout The zookeeper receive timeout
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* \param callback The callback to be executed on updates
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*
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* \return A ZookeeperSubscription that will auto-unsubscribe upon destruction
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*/
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ZookeeperSubscription subscribe(const std::string& endpoint,
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std::chrono::milliseconds receive_timeout,
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ZookeeperWatcher::WatcherCallback callback);
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/**
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* Unsubscribes from a previous subscription
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*
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* \param subscriber The subscriber return by a previous call to ZookeeperPool::subscribe
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*/
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void unsubscribe(const ZookeeperSubscription& subscriber);
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/**
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* \brief Gets the broker list for the given zookeeper endpoint
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*
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* Requires having previously called subscribe for this endpoint at least once.
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*
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* \param endpoint The endpoint for which to get the broker list
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*/
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std::string get_brokers(const std::string& endpoint);
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/**
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* Gets the amount of subscribers for the given zookeeper endpoint
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*/
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size_t get_subscriber_count(const std::string& endpoint) const;
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private:
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using WatchersMap = std::map<std::string, ZookeeperWatcher>;
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WatchersMap watchers_;
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mutable std::mutex watchers_mutex_;
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};
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} // cppkafka
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#endif // CPPKAFKA_ZOOKEEPER_POOL_H
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