net_instaweb::SharedMemHistogram Class Reference

Inheritance diagram for net_instaweb::SharedMemHistogram:
net_instaweb::Histogram

List of all members.

Classes

struct  HistogramBody

Public Member Functions

virtual void Add (double value)
 Record a value in its bucket.
virtual void Clear ()
 Throw away all data.
virtual int MaxBuckets ()
virtual void EnableNegativeBuckets ()
virtual void SetMinValue (double value)
 Set the minimum value allowed in histogram.
virtual void SetMaxValue (double value)
virtual void SetMaxBuckets (int i)
size_t AllocationSize ()

Protected Member Functions

virtual AbstractMutexlock ()
virtual double AverageInternal ()
virtual double PercentileInternal (const double perc)
virtual double StandardDeviationInternal ()
virtual double CountInternal ()
virtual double MaximumInternal ()
virtual double MinimumInternal ()
virtual double BucketStart (int index)
virtual double BucketCount (int index)
 Value of a bucket.

Friends

class SharedMemStatistics

Member Function Documentation

size_t net_instaweb::SharedMemHistogram::AllocationSize (  )  [inline]

Return the allocation size for this Histogram object except Mutex size. Shared memory space should include a mutex, HistogramBody and sizeof(double) * MaxBuckets(). Here we do not know mutex size.

virtual double net_instaweb::SharedMemHistogram::BucketStart ( int  index  )  [protected, virtual]

Lower bound of a bucket. If index == MaxBuckets() + 1, returns the upper bound of the histogram. DCHECK if index is in the range of [0, MaxBuckets()+1].

Implements net_instaweb::Histogram.

virtual void net_instaweb::SharedMemHistogram::EnableNegativeBuckets (  )  [virtual]

Call the following functions after statistics->Init and before add values. EnableNegativeBuckets, SetMinValue and SetMaxValue will cause resetting Histogram.

Implements net_instaweb::Histogram.

virtual int net_instaweb::SharedMemHistogram::MaxBuckets (  )  [virtual]

Maxmum number of buckets. This number can be used to allocate a buffer for Histogram.

Implements net_instaweb::Histogram.

virtual void net_instaweb::SharedMemHistogram::SetMaxBuckets ( int  i  )  [virtual]

We rely on MaxBuckets to allocate memory segment for histogram. If we want to call SetMaxBuckets(), we should call it right after AddHistogram().

Implements net_instaweb::Histogram.

virtual void net_instaweb::SharedMemHistogram::SetMaxValue ( double  value  )  [virtual]

Set the upper-bound of value in histogram, The value range in histogram is [MinValue, MaxValue) or (-MaxValue, MaxValue) if negative buckets are enabled.

Implements net_instaweb::Histogram.


The documentation for this class was generated from the following file:
 All Classes Namespaces Files Functions Variables Typedefs Enumerations Enumerator Friends Defines
Generated on Tue May 29 16:34:17 2012 for Page Speed Optimization Libraries by  doxygen 1.6.3