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//=============================================================================
/**
* @file Basic_Stats.h
*
* $Id$
*
* @author Carlos O'Ryan <coryan@uci.edu>
*/
//=============================================================================
#ifndef ACE_BASIC_STATS_H
#define ACE_BASIC_STATS_H
#include /**/ "ace/pre.h"
#include "ace/config-all.h"
#include "ace/Basic_Types.h"
#if !defined (ACE_LACKS_PRAGMA_ONCE)
# pragma once
#endif /* ACE_LACKS_PRAGMA_ONCE */
/// Collect basic stats about a series of samples
/**
* Compute the average and standard deviation (aka jitter) for an
* arbitrary number of samples, using constant space.
* Normally used for latency statistics.
*/
class ACE_Export ACE_Basic_Stats
{
public:
/// Constructor
/**
* The number of samples is pre-allocated, and cannot changes once
* the class is initialized.
*/
ACE_Basic_Stats (void);
/// The number of samples received so far
ACE_UINT32 samples_count (void) const;
/// Record one sample.
void sample (ACE_UINT64 value);
/// Update the values to reflect the stats in @a rhs.
void accumulate (const ACE_Basic_Stats &rhs);
/// Dump all the samples
/**
* Prints out the results, using @a msg as a prefix for each message and
* scaling all the numbers by @a scale_factor. The latter is useful because
* high resolution timer samples are acquired in clock ticks, but often
* presented in microseconds.
*/
void dump_results (const ACE_TCHAR *msg,
ACE_UINT32 scale_factor) const;
private:
/// The number of samples
ACE_UINT32 samples_count_;
/// The minimum value
ACE_UINT64 min_;
/// The number of the sample that had the minimum value
ACE_UINT32 min_at_;
/// The maximum value
ACE_UINT64 max_;
/// The number of the sample that had the maximum value
ACE_UINT32 max_at_;
/// The sum of all the values
ACE_UINT64 sum_;
/// The sum of the square of all the values
ACE_UINT64 sum2_;
};
#if defined (__ACE_INLINE__)
#include "ace/Basic_Stats.inl"
#endif /* __ACE_INLINE__ */
#include /**/ "ace/post.h"
#endif /* ACE_BASIC_STATS_H */
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