Add zookeeper support

include/cppkafka/zookeeper/zookeeper_pool.h

@@ -0,0 +1,63 @@
+/*
+ * Copyright (c) 2016, Matias Fontanini
+ * All rights reserved.
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions are
+ * met:
+ *
+ * * Redistributions of source code must retain the above copyright
+ *   notice, this list of conditions and the following disclaimer.
+ * * Redistributions in binary form must reproduce the above
+ *   copyright notice, this list of conditions and the following disclaimer
+ *   in the documentation and/or other materials provided with the
+ *   distribution.
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
+ * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
+ * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
+ * A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
+ * OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
+ * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
+ * LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
+ * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
+ * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
+ * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
+ * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
+ *
+ */
+
+#ifndef CPPKAFKA_ZOOKEEPER_POOL_H
+#define CPPKAFKA_ZOOKEEPER_POOL_H
+
+#include <map>
+#include <string>
+#include <chrono>
+#include <mutex>
+#include "zookeeper/zookeeper_watcher.h"
+
+namespace cppkafka {
+
+class ZookeeperSubscriber;
+
+class ZookeeperPool {
+public:
+    static ZookeeperPool& instance();
+
+    ZookeeperSubscriber subscribe(const std::string& endpoint,
+                                  std::chrono::milliseconds receive_timeout,
+                                  ZookeeperWatcher::WatcherCallback callback);
+    void unsubscribe(const ZookeeperSubscriber& subscriber);
+    std::string get_brokers(const std::string& endpoint);
+
+    size_t get_subscriber_count(const std::string& endpoint) const;
+private:
+    using WatchersMap = std::map<std::string, ZookeeperWatcher>;
+
+    WatchersMap watchers_;
+    mutable std::mutex watchers_mutex_;
+};
+
+} // cppkafka
+
+#endif // CPPKAFKA_ZOOKEEPER_POOL_H