MetricsHandler.h

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/* -*- c++ -*-
 * Copyright (C) 2007-2015 Hypertable, Inc.
 *
 * This file is part of Hypertable.
 *
 * Hypertable is free software; you can redistribute it and/or
 * modify it under the terms of the GNU General Public License
 * as published by the Free Software Foundation; either version 3
 * of the License, or any later version.
 *
 * Hypertable is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 * GNU General Public License for more details.
 *
 * You should have received a copy of the GNU General Public License
 * along with this program; if not, write to the Free Software
 * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA
 * 02110-1301, USA.
 */


#ifndef ThriftBroker_MetricsHandler_h
#define ThriftBroker_MetricsHandler_h

#include <AsyncComm/Comm.h>
#include <AsyncComm/DispatchHandler.h>

#include <Common/Cronolog.h>
#include <Common/MetricsCollectorGanglia.h>
#include <Common/MetricsProcess.h>
#include <Common/Properties.h>
#include <Common/metrics>

#include <atomic>
#include <memory>
#include <mutex>

namespace Hypertable {

  using namespace std;


  class MetricsHandler : public DispatchHandler {
  public:

    MetricsHandler(PropertiesPtr &props, Cronolog *slow_query_log);

    virtual ~MetricsHandler() {};

    void start_collecting();

    void stop_collecting();

    virtual void handle(EventPtr &event);

    void request_increment() {
      m_requests.current++;
    }

    void error_increment() {
      m_errors.current++;
    }

    void connection_increment() {
      m_active_connections++;
    }

    void connection_decrement() {
      m_active_connections--;
    }

  private:

    Comm *m_comm {};

    MetricsCollectorGangliaPtr m_ganglia_collector;

    MetricsProcess m_metrics_process;

    Cronolog *m_slow_query_log {};

    int64_t m_last_timestamp;

    int32_t m_collection_interval {};

    interval_metric<int64_t> m_requests {};

    interval_metric<int64_t> m_errors {};

    atomic<int32_t> m_active_connections {0};
  };

  typedef std::shared_ptr<MetricsHandler> MetricsHandlerPtr;

}

#endif // ThriftBroker_MetricsHandler_h