YugabyteDB (2.13.0.0-b42, bfc6a6643e7399ac8a0e81d06a3ee6d6571b33ab)

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//   http://www.apache.org/licenses/LICENSE-2.0

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// The following only applies to changes made to this file as part of YugaByte development.

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// Portions Copyright (c) YugaByte, Inc.

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// Licensed 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

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// http://www.apache.org/licenses/LICENSE-2.0

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#ifndef YB_UTIL_TEST_GRAPH_H

#define YB_UTIL_TEST_GRAPH_H

#include <memory>

#include <string>

#include <unordered_map>

#include "yb/gutil/ref_counted.h"

#include "yb/gutil/macros.h"

#include "yb/gutil/walltime.h"

#include "yb/util/countdown_latch.h"

#include "yb/util/faststring.h"

#include "yb/util/locks.h"

namespace yb {

class Thread;

class TimeSeries {

 public:

  void AddValue(double val);

  void SetValue(double val);

  double value() const;

 private:

  friend class TimeSeriesCollector;

  TimeSeries() :

    val_(0)

  {}

  mutable simple_spinlock lock_;

  double val_;

  DISALLOW_COPY_AND_ASSIGN(TimeSeries);

};

class TimeSeriesCollector {

 public:

  explicit TimeSeriesCollector(std::string scope);

  ~TimeSeriesCollector();

  std::shared_ptr<TimeSeries> GetTimeSeries(const std::string &key);

  void StartDumperThread();

  void StopDumperThread();

 private:

  void DumperThread();

  void BuildMetricsString(WallTime time_since_start, faststring *dst_buf) const;

  std::string scope_;

  typedef std::unordered_map<std::string, std::shared_ptr<TimeSeries> > SeriesMap;

  SeriesMap series_map_;

  mutable Mutex series_lock_;

  scoped_refptr<yb::Thread> dumper_thread_;

  // Latch used to stop the dumper_thread_. When the thread is started,

  // this is set to 1, and when the thread should exit, it is counted down.

  CountDownLatch exit_latch_;

  bool started_;

  DISALLOW_COPY_AND_ASSIGN(TimeSeriesCollector);

};

} // namespace yb

#endif // YB_UTIL_TEST_GRAPH_H