Package org.HdrHistogram

Class DoubleHistogram

java.lang.Object
org.HdrHistogram.EncodableHistogram
org.HdrHistogram.DoubleHistogram
All Implemented Interfaces:
Serializable, DoubleValueRecorder
Direct Known Subclasses:
ConcurrentDoubleHistogram, PackedDoubleHistogram, SynchronizedDoubleHistogram
public class DoubleHistogram extends EncodableHistogram implements DoubleValueRecorder, Serializable

A floating point values High Dynamic Range (HDR) Histogram

It is important to note that DoubleHistogram is not thread-safe, and does not support safe concurrent recording by multiple threads. If concurrent operation is required, consider using ConcurrentDoubleHistogram, SynchronizedDoubleHistogram, or (recommended) DoubleRecorder or SingleWriterDoubleRecorder which are intended for this purpose.

DoubleHistogram supports the recording and analyzing sampled data value counts across a configurable dynamic range of floating point (double) values, with configurable value precision within the range. Dynamic range is expressed as a ratio between the highest and lowest non-zero values trackable within the histogram at any given time. Value precision is expressed as the number of significant [decimal] digits in the value recording, and provides control over value quantization behavior across the value range and the subsequent value resolution at any given level.

Auto-ranging: Unlike integer value based histograms, the specific value range tracked by a DoubleHistogram is not specified upfront. Only the dynamic range of values that the histogram can cover is (optionally) specified. E.g. When a DoubleHistogram is created to track a dynamic range of 3600000000000 (enough to track values from a nanosecond to an hour), values could be recorded into into it in any consistent unit of time as long as the ratio between the highest and lowest non-zero values stays within the specified dynamic range, so recording in units of nanoseconds (1.0 thru 3600000000000.0), milliseconds (0.000001 thru 3600000.0) seconds (0.000000001 thru 3600.0), hours (1/3.6E12 thru 1.0) will all work just as well.

Auto-resizing: When constructed with no specified dynamic range (or when auto-resize is turned on with setAutoResize(boolean)) a DoubleHistogram will auto-resize its dynamic range to include recorded values as they are encountered. Note that recording calls that cause auto-resizing may take longer to execute, as resizing incurs allocation and copying of internal data structures.

Attempts to record non-zero values that range outside of the specified dynamic range (or exceed the limits of of dynamic range when auto-resizing) may results in ArrayIndexOutOfBoundsException exceptions, either due to overflow or underflow conditions. These exceptions will only be thrown if recording the value would have resulted in discarding or losing the required value precision of values already recorded in the histogram.

See package description for org.HdrHistogram for details.

See Also:

  • Constructor Details

    • DoubleHistogram

      public DoubleHistogram(int numberOfSignificantValueDigits)
      Construct a new auto-resizing DoubleHistogram using a precision stated as a number of significant decimal digits.
      Parameters:
      numberOfSignificantValueDigits - Specifies the precision to use. This is the number of significant decimal digits to which the histogram will maintain value resolution and separation. Must be a non-negative integer between 0 and 5.

    • DoubleHistogram

      public DoubleHistogram(int numberOfSignificantValueDigits, Class<? extends AbstractHistogram> internalCountsHistogramClass)
      Construct a new auto-resizing DoubleHistogram using a precision stated as a number of significant decimal digits. The DoubleHistogram will use the specified AbstractHistogram subclass for tracking internal counts (e.g. Histogram, ConcurrentHistogram, SynchronizedHistogram, IntCountsHistogram, ShortCountsHistogram).
      Parameters:
      numberOfSignificantValueDigits - Specifies the precision to use. This is the number of significant decimal digits to which the histogram will maintain value resolution and separation. Must be a non-negative integer between 0 and 5.
      internalCountsHistogramClass - The class to use for internal counts tracking

    • DoubleHistogram

      public DoubleHistogram(long highestToLowestValueRatio, int numberOfSignificantValueDigits)
      Construct a new DoubleHistogram with the specified dynamic range (provided in highestToLowestValueRatio) and using a precision stated as a number of significant decimal digits.
      Parameters:
      highestToLowestValueRatio - specifies the dynamic range to use
      numberOfSignificantValueDigits - Specifies the precision to use. This is the number of significant decimal digits to which the histogram will maintain value resolution and separation. Must be a non-negative integer between 0 and 5.

    • DoubleHistogram

      protected DoubleHistogram(long highestToLowestValueRatio, int numberOfSignificantValueDigits, Class<? extends AbstractHistogram> internalCountsHistogramClass)
      Construct a new DoubleHistogram with the specified dynamic range (provided in highestToLowestValueRatio) and using a precision stated as a number of significant decimal digits. The DoubleHistogram will use the specified AbstractHistogram subclass for tracking internal counts (e.g. Histogram, ConcurrentHistogram, SynchronizedHistogram, IntCountsHistogram, ShortCountsHistogram).
      Parameters:
      highestToLowestValueRatio - specifies the dynamic range to use.
      numberOfSignificantValueDigits - Specifies the precision to use. This is the number of significant decimal digits to which the histogram will maintain value resolution and separation. Must be a non-negative integer between 0 and 5.
      internalCountsHistogramClass - The class to use for internal counts tracking

    • DoubleHistogram

      public DoubleHistogram(DoubleHistogram source)
      Construct a DoubleHistogram with the same range settings as a given source, duplicating the source's start/end timestamps (but NOT it's contents)
      Parameters:
      source - The source histogram to duplicate

  • Method Details

    • isAutoResize

      public boolean isAutoResize()

    • setAutoResize

      public void setAutoResize(boolean autoResize)

    • recordValue

      public void recordValue(double value) throws ArrayIndexOutOfBoundsException
      Record a value in the histogram
      Specified by:
      recordValue in interface DoubleValueRecorder
      Parameters:
      value - The value to be recorded
      Throws:
      ArrayIndexOutOfBoundsException - (may throw) if value cannot be covered by the histogram's range

    • recordValueWithCount

      public void recordValueWithCount(double value, long count) throws ArrayIndexOutOfBoundsException
      Record a value in the histogram (adding to the value's current count)
      Specified by:
      recordValueWithCount in interface DoubleValueRecorder
      Parameters:
      value - The value to be recorded
      count - The number of occurrences of this value to record
      Throws:
      ArrayIndexOutOfBoundsException - (may throw) if value cannot be covered by the histogram's range

    • recordValueWithExpectedInterval

      public void recordValueWithExpectedInterval(double value, double expectedIntervalBetweenValueSamples) throws ArrayIndexOutOfBoundsException
      Record a value in the histogram.

      To compensate for the loss of sampled values when a recorded value is larger than the expected interval between value samples, Histogram will auto-generate an additional series of decreasingly-smaller (down to the expectedIntervalBetweenValueSamples) value records.

      Note: This is a at-recording correction method, as opposed to the post-recording correction method provided by copyCorrectedForCoordinatedOmission(double). The use cases for these two methods are mutually exclusive, and only one of the two should be be used on a given data set to correct for the same coordinated omission issue.

      See notes in the description of the Histogram calls for an illustration of why this corrective behavior is important.

      Specified by:
      recordValueWithExpectedInterval in interface DoubleValueRecorder
      Parameters:
      value - The value to record
      expectedIntervalBetweenValueSamples - If expectedIntervalBetweenValueSamples is larger than 0, add auto-generated value records as appropriate if value is larger than expectedIntervalBetweenValueSamples
      Throws:
      ArrayIndexOutOfBoundsException - (may throw) if value cannot be covered by the histogram's range

    • reset

      public void reset()
      Reset the contents and stats of this histogram
      Specified by:
      reset in interface DoubleValueRecorder

    • copy

      public DoubleHistogram copy()
      Create a copy of this histogram, complete with data and everything.
      Returns:
      A distinct copy of this histogram.

    • copyCorrectedForCoordinatedOmission

      public DoubleHistogram copyCorrectedForCoordinatedOmission(double expectedIntervalBetweenValueSamples)
      Get a copy of this histogram, corrected for coordinated omission.

      To compensate for the loss of sampled values when a recorded value is larger than the expected interval between value samples, the new histogram will include an auto-generated additional series of decreasingly-smaller (down to the expectedIntervalBetweenValueSamples) value records for each count found in the current histogram that is larger than the expectedIntervalBetweenValueSamples. Note: This is a post-correction method, as opposed to the at-recording correction method provided by recordValueWithExpectedInterval. The two methods are mutually exclusive, and only one of the two should be be used on a given data set to correct for the same coordinated omission issue. by

      See notes in the description of the Histogram calls for an illustration of why this corrective behavior is important.

      Parameters:
      expectedIntervalBetweenValueSamples - If expectedIntervalBetweenValueSamples is larger than 0, add auto-generated value records as appropriate if value is larger than expectedIntervalBetweenValueSamples
      Returns:
      a copy of this histogram, corrected for coordinated omission.

    • copyInto

      public void copyInto(DoubleHistogram targetHistogram)
      Copy this histogram into the target histogram, overwriting it's contents.
      Parameters:
      targetHistogram - the histogram to copy into

    • copyIntoCorrectedForCoordinatedOmission

      public void copyIntoCorrectedForCoordinatedOmission(DoubleHistogram targetHistogram, double expectedIntervalBetweenValueSamples)
      Copy this histogram, corrected for coordinated omission, into the target histogram, overwriting it's contents. (see copyCorrectedForCoordinatedOmission(double) for more detailed explanation about how correction is applied)
      Parameters:
      targetHistogram - the histogram to copy into
      expectedIntervalBetweenValueSamples - If expectedIntervalBetweenValueSamples is larger than 0, add auto-generated value records as appropriate if value is larger than expectedIntervalBetweenValueSamples

    • add

      public void add(DoubleHistogram fromHistogram) throws ArrayIndexOutOfBoundsException
      Add the contents of another histogram to this one.
      Parameters:
      fromHistogram - The other histogram.
      Throws:
      ArrayIndexOutOfBoundsException - (may throw) if values in fromHistogram's cannot be covered by this histogram's range

    • addWhileCorrectingForCoordinatedOmission

      public void addWhileCorrectingForCoordinatedOmission(DoubleHistogram fromHistogram, double expectedIntervalBetweenValueSamples)
      Add the contents of another histogram to this one, while correcting the incoming data for coordinated omission.

      To compensate for the loss of sampled values when a recorded value is larger than the expected interval between value samples, the values added will include an auto-generated additional series of decreasingly-smaller (down to the expectedIntervalBetweenValueSamples) value records for each count found in the current histogram that is larger than the expectedIntervalBetweenValueSamples. Note: This is a post-recording correction method, as opposed to the at-recording correction method provided by recordValueWithExpectedInterval. The two methods are mutually exclusive, and only one of the two should be be used on a given data set to correct for the same coordinated omission issue. by

      See notes in the description of the Histogram calls for an illustration of why this corrective behavior is important.

      Parameters:
      fromHistogram - Other histogram. highestToLowestValueRatio and numberOfSignificantValueDigits must match.
      expectedIntervalBetweenValueSamples - If expectedIntervalBetweenValueSamples is larger than 0, add auto-generated value records as appropriate if value is larger than expectedIntervalBetweenValueSamples
      Throws:
      ArrayIndexOutOfBoundsException - (may throw) if values exceed highestTrackableValue

    • subtract

      public void subtract(DoubleHistogram otherHistogram)
      Subtract the contents of another histogram from this one.
      Parameters:
      otherHistogram - The other histogram.
      Throws:
      ArrayIndexOutOfBoundsException - (may throw) if values in fromHistogram's cannot be covered by this histogram's range

    • equals

      public boolean equals(Object other)
      Determine if this histogram is equivalent to another.
      Overrides:
      equals in class Object
      Parameters:
      other - the other histogram to compare to
      Returns:
      True if this histogram are equivalent with the other.

    • hashCode

      public int hashCode()
      Overrides:
      hashCode in class Object

    • getTotalCount

      public long getTotalCount()
      Get the total count of all recorded values in the histogram
      Returns:
      the total count of all recorded values in the histogram

    • getIntegerToDoubleValueConversionRatio

      public double getIntegerToDoubleValueConversionRatio()
      Get the current conversion ratio from interval integer value representation to double units. (keep in mind that this can change because it is auto ranging). This ratio can be useful for converting integer values found in iteration, although the preferred form for accessing iteration values would be to use the getDoubleValueIteratedTo() and getDoubleValueIteratedFrom() accessors to HistogramIterationValue iterated values.
      Returns:
      the current conversion ratio from interval integer value representation to double units.

    • getNumberOfSignificantValueDigits

      public int getNumberOfSignificantValueDigits()
      get the configured numberOfSignificantValueDigits
      Returns:
      numberOfSignificantValueDigits

    • getHighestToLowestValueRatio

      public long getHighestToLowestValueRatio()
      get the Dynamic range of the histogram: the configured ratio between the highest trackable value and the lowest trackable non zero value at any given time.
      Returns:
      the dynamic range of the histogram, expressed as the ratio between the highest trackable value and the lowest trackable non zero value at any given time.

    • sizeOfEquivalentValueRange

      public double sizeOfEquivalentValueRange(double value)
      Get the size (in value units) of the range of values that are equivalent to the given value within the histogram's resolution. Where "equivalent" means that value samples recorded for any two equivalent values are counted in a common total count.
      Parameters:
      value - The given value
      Returns:
      The lowest value that is equivalent to the given value within the histogram's resolution.

    • lowestEquivalentValue

      public double lowestEquivalentValue(double value)
      Get the lowest value that is equivalent to the given value within the histogram's resolution. Where "equivalent" means that value samples recorded for any two equivalent values are counted in a common total count.
      Parameters:
      value - The given value
      Returns:
      The lowest value that is equivalent to the given value within the histogram's resolution.

    • highestEquivalentValue

      public double highestEquivalentValue(double value)
      Get the highest value that is equivalent to the given value within the histogram's resolution. Where "equivalent" means that value samples recorded for any two equivalent values are counted in a common total count.
      Parameters:
      value - The given value
      Returns:
      The highest value that is equivalent to the given value within the histogram's resolution.

    • medianEquivalentValue

      public double medianEquivalentValue(double value)
      Get a value that lies in the middle (rounded up) of the range of values equivalent the given value. Where "equivalent" means that value samples recorded for any two equivalent values are counted in a common total count.
      Parameters:
      value - The given value
      Returns:
      The value lies in the middle (rounded up) of the range of values equivalent the given value.

    • nextNonEquivalentValue

      public double nextNonEquivalentValue(double value)
      Get the next value that is not equivalent to the given value within the histogram's resolution. Where "equivalent" means that value samples recorded for any two equivalent values are counted in a common total count.
      Parameters:
      value - The given value
      Returns:
      The next value that is not equivalent to the given value within the histogram's resolution.

    • valuesAreEquivalent

      public boolean valuesAreEquivalent(double value1, double value2)
      Determine if two values are equivalent with the histogram's resolution. Where "equivalent" means that value samples recorded for any two equivalent values are counted in a common total count.
      Parameters:
      value1 - first value to compare
      value2 - second value to compare
      Returns:
      True if values are equivalent to within the histogram's resolution.

    • getEstimatedFootprintInBytes

      public int getEstimatedFootprintInBytes()
      Provide a (conservatively high) estimate of the Histogram's total footprint in bytes
      Returns:
      a (conservatively high) estimate of the Histogram's total footprint in bytes

    • getStartTimeStamp

      public long getStartTimeStamp()
      get the start time stamp [optionally] stored with this histogram
      Specified by:
      getStartTimeStamp in class EncodableHistogram
      Returns:
      the start time stamp [optionally] stored with this histogram

    • setStartTimeStamp

      public void setStartTimeStamp(long timeStampMsec)
      Set the start time stamp value associated with this histogram to a given value.
      Specified by:
      setStartTimeStamp in class EncodableHistogram
      Parameters:
      timeStampMsec - the value to set the time stamp to, [by convention] in msec since the epoch.

    • getEndTimeStamp

      public long getEndTimeStamp()
      get the end time stamp [optionally] stored with this histogram
      Specified by:
      getEndTimeStamp in class EncodableHistogram
      Returns:
      the end time stamp [optionally] stored with this histogram

    • setEndTimeStamp

      public void setEndTimeStamp(long timeStampMsec)
      Set the end time stamp value associated with this histogram to a given value.
      Specified by:
      setEndTimeStamp in class EncodableHistogram
      Parameters:
      timeStampMsec - the value to set the time stamp to, [by convention] in msec since the epoch.

    • getTag

      public String getTag()
      get the tag string [optionally] associated with this histogram
      Specified by:
      getTag in class EncodableHistogram
      Returns:
      tag string [optionally] associated with this histogram

    • setTag

      public void setTag(String tag)
      Set the tag string associated with this histogram
      Specified by:
      setTag in class EncodableHistogram
      Parameters:
      tag - the tag string to associate with this histogram

    • getMinValue

      public double getMinValue()
      Get the lowest recorded value level in the histogram
      Returns:
      the Min value recorded in the histogram

    • getMaxValue

      public double getMaxValue()
      Get the highest recorded value level in the histogram
      Returns:
      the Max value recorded in the histogram

    • getMinNonZeroValue

      public double getMinNonZeroValue()
      Get the lowest recorded non-zero value level in the histogram
      Returns:
      the lowest recorded non-zero value level in the histogram

    • getMaxValueAsDouble

      public double getMaxValueAsDouble()
      Get the highest recorded value level in the histogram as a double
      Specified by:
      getMaxValueAsDouble in class EncodableHistogram
      Returns:
      the highest recorded value level in the histogram as a double

    • getMean

      public double getMean()
      Get the computed mean value of all recorded values in the histogram
      Returns:
      the mean value (in value units) of the histogram data

    • getStdDeviation

      public double getStdDeviation()
      Get the computed standard deviation of all recorded values in the histogram
      Returns:
      the standard deviation (in value units) of the histogram data

    • getValueAtPercentile

      public double getValueAtPercentile(double percentile)
      Get the value at a given percentile. When the percentile is > 0.0, the value returned is the value that the given the given percentage of the overall recorded value entries in the histogram are either smaller than or equivalent to. When the percentile is 0.0, the value returned is the value that all value entries in the histogram are either larger than or equivalent to.

      Note that two values are "equivalent" in this statement if valuesAreEquivalent(double, double) would return true.

      Parameters:
      percentile - The percentile for which to return the associated value
      Returns:
      The value that the given percentage of the overall recorded value entries in the histogram are either smaller than or equivalent to. When the percentile is 0.0, returns the value that all value entries in the histogram are either larger than or equivalent to.

    • getPercentileAtOrBelowValue

      public double getPercentileAtOrBelowValue(double value)
      Get the percentile at a given value. The percentile returned is the percentile of values recorded in the histogram that are smaller than or equivalent to the given value.

      Note that two values are "equivalent" in this statement if valuesAreEquivalent(double, double) would return true.

      Parameters:
      value - The value for which to return the associated percentile
      Returns:
      The percentile of values recorded in the histogram that are smaller than or equivalent to the given value.

    • getCountBetweenValues

      public double getCountBetweenValues(double lowValue, double highValue) throws ArrayIndexOutOfBoundsException
      Get the count of recorded values within a range of value levels (inclusive to within the histogram's resolution).
      Parameters:
      lowValue - The lower value bound on the range for which to provide the recorded count. Will be rounded down with lowestEquivalentValue.
      highValue - The higher value bound on the range for which to provide the recorded count. Will be rounded up with highestEquivalentValue.
      Returns:
      the total count of values recorded in the histogram within the value range that is >= lowestEquivalentValue(lowValue) and <= highestEquivalentValue(highValue)
      Throws:
      ArrayIndexOutOfBoundsException

    • getCountAtValue

      public long getCountAtValue(double value) throws ArrayIndexOutOfBoundsException
      Get the count of recorded values at a specific value (to within the histogram resolution at the value level).
      Parameters:
      value - The value for which to provide the recorded count
      Returns:
      The total count of values recorded in the histogram within the value range that is >= lowestEquivalentValue(value) and <= highestEquivalentValue(value)
      Throws:
      ArrayIndexOutOfBoundsException

    • percentiles

      public DoubleHistogram.Percentiles percentiles(int percentileTicksPerHalfDistance)
      Provide a means of iterating through histogram values according to percentile levels. The iteration is performed in steps that start at 0% and reduce their distance to 100% according to the percentileTicksPerHalfDistance parameter, ultimately reaching 100% when all recorded histogram values are exhausted.
      Parameters:
      percentileTicksPerHalfDistance - The number of iteration steps per half-distance to 100%.
      Returns:
      An Iterable<DoubleHistogramIterationValue> through the histogram using a DoublePercentileIterator

    • linearBucketValues

      public DoubleHistogram.LinearBucketValues linearBucketValues(double valueUnitsPerBucket)
      Provide a means of iterating through histogram values using linear steps. The iteration is performed in steps of valueUnitsPerBucket in size, terminating when all recorded histogram values are exhausted.
      Parameters:
      valueUnitsPerBucket - The size (in value units) of the linear buckets to use
      Returns:
      An Iterable<DoubleHistogramIterationValue> through the histogram using a DoubleLinearIterator

    • logarithmicBucketValues

      public DoubleHistogram.LogarithmicBucketValues logarithmicBucketValues(double valueUnitsInFirstBucket, double logBase)
      Provide a means of iterating through histogram values at logarithmically increasing levels. The iteration is performed in steps that start at valueUnitsInFirstBucket and increase exponentially according to logBase, terminating when all recorded histogram values are exhausted.
      Parameters:
      valueUnitsInFirstBucket - The size (in value units) of the first bucket in the iteration
      logBase - The multiplier by which bucket sizes will grow in each iteration step
      Returns:
      An Iterable<DoubleHistogramIterationValue> through the histogram using a DoubleLogarithmicIterator

    • recordedValues

      public DoubleHistogram.RecordedValues recordedValues()
      Provide a means of iterating through all recorded histogram values using the finest granularity steps supported by the underlying representation. The iteration steps through all non-zero recorded value counts, and terminates when all recorded histogram values are exhausted.
      Returns:
      An Iterable<DoubleHistogramIterationValue> through the histogram using a DoubleRecordedValuesIterator

    • allValues

      public DoubleHistogram.AllValues allValues()
      Provide a means of iterating through all histogram values using the finest granularity steps supported by the underlying representation. The iteration steps through all possible unit value levels, regardless of whether or not there were recorded values for that value level, and terminates when all recorded histogram values are exhausted.
      Returns:
      An Iterable<DoubleHistogramIterationValue> through the histogram using a DoubleAllValuesIterator

    • outputPercentileDistribution

      public void outputPercentileDistribution(PrintStream printStream, Double outputValueUnitScalingRatio)
      Produce textual representation of the value distribution of histogram data by percentile. The distribution is output with exponentially increasing resolution, with each exponentially decreasing half-distance containing five (5) percentile reporting tick points.
      Parameters:
      printStream - Stream into which the distribution will be output
      outputValueUnitScalingRatio - The scaling factor by which to divide histogram recorded values units in output

    • outputPercentileDistribution

      public void outputPercentileDistribution(PrintStream printStream, int percentileTicksPerHalfDistance, Double outputValueUnitScalingRatio)
      Produce textual representation of the value distribution of histogram data by percentile. The distribution is output with exponentially increasing resolution, with each exponentially decreasing half-distance containing dumpTicksPerHalf percentile reporting tick points.
      Parameters:
      printStream - Stream into which the distribution will be output
      percentileTicksPerHalfDistance - The number of reporting points per exponentially decreasing half-distance
      outputValueUnitScalingRatio - The scaling factor by which to divide histogram recorded values units in output

    • outputPercentileDistribution

      public void outputPercentileDistribution(PrintStream printStream, int percentileTicksPerHalfDistance, Double outputValueUnitScalingRatio, boolean useCsvFormat)
      Produce textual representation of the value distribution of histogram data by percentile. The distribution is output with exponentially increasing resolution, with each exponentially decreasing half-distance containing dumpTicksPerHalf percentile reporting tick points.
      Parameters:
      printStream - Stream into which the distribution will be output
      percentileTicksPerHalfDistance - The number of reporting points per exponentially decreasing half-distance
      outputValueUnitScalingRatio - The scaling factor by which to divide histogram recorded values units in output
      useCsvFormat - Output in CSV format if true. Otherwise use plain text form.

    • getNeededByteBufferCapacity

      public int getNeededByteBufferCapacity()
      Get the capacity needed to encode this histogram into a ByteBuffer
      Specified by:
      getNeededByteBufferCapacity in class EncodableHistogram
      Returns:
      the capacity needed to encode this histogram into a ByteBuffer

    • encodeIntoByteBuffer

      public int encodeIntoByteBuffer(ByteBuffer buffer)
      Encode this histogram into a ByteBuffer
      Parameters:
      buffer - The buffer to encode into
      Returns:
      The number of bytes written to the buffer

    • encodeIntoCompressedByteBuffer

      public int encodeIntoCompressedByteBuffer(ByteBuffer targetBuffer, int compressionLevel)
      Encode this histogram in compressed form into a byte array
      Specified by:
      encodeIntoCompressedByteBuffer in class EncodableHistogram
      Parameters:
      targetBuffer - The buffer to encode into
      compressionLevel - Compression level (for java.util.zip.Deflater).
      Returns:
      The number of bytes written to the buffer

    • encodeIntoCompressedByteBuffer

      public int encodeIntoCompressedByteBuffer(ByteBuffer targetBuffer)
      Encode this histogram in compressed form into a byte array
      Parameters:
      targetBuffer - The buffer to encode into
      Returns:
      The number of bytes written to the array

    • decodeFromByteBuffer

      public static DoubleHistogram decodeFromByteBuffer(ByteBuffer buffer, long minBarForHighestToLowestValueRatio)
      Construct a new DoubleHistogram by decoding it from a ByteBuffer.
      Parameters:
      buffer - The buffer to decode from
      minBarForHighestToLowestValueRatio - Force highestTrackableValue to be set at least this high
      Returns:
      The newly constructed DoubleHistogram

    • decodeFromByteBuffer

      public static DoubleHistogram decodeFromByteBuffer(ByteBuffer buffer, Class<? extends AbstractHistogram> internalCountsHistogramClass, long minBarForHighestToLowestValueRatio)
      Construct a new DoubleHistogram by decoding it from a ByteBuffer, using a specified AbstractHistogram subclass for tracking internal counts (e.g. Histogram, ConcurrentHistogram, SynchronizedHistogram, IntCountsHistogram, ShortCountsHistogram).
      Parameters:
      buffer - The buffer to decode from
      internalCountsHistogramClass - The class to use for internal counts tracking
      minBarForHighestToLowestValueRatio - Force highestTrackableValue to be set at least this high
      Returns:
      The newly constructed DoubleHistogram

    • decodeFromCompressedByteBuffer

      public static DoubleHistogram decodeFromCompressedByteBuffer(ByteBuffer buffer, long minBarForHighestToLowestValueRatio) throws DataFormatException
      Construct a new DoubleHistogram by decoding it from a compressed form in a ByteBuffer.
      Parameters:
      buffer - The buffer to decode from
      minBarForHighestToLowestValueRatio - Force highestTrackableValue to be set at least this high
      Returns:
      The newly constructed DoubleHistogram
      Throws:
      DataFormatException - on error parsing/decompressing the buffer

    • decodeFromCompressedByteBuffer

      public static DoubleHistogram decodeFromCompressedByteBuffer(ByteBuffer buffer, Class<? extends AbstractHistogram> internalCountsHistogramClass, long minBarForHighestToLowestValueRatio) throws DataFormatException
      Construct a new DoubleHistogram by decoding it from a compressed form in a ByteBuffer, using a specified AbstractHistogram subclass for tracking internal counts (e.g. Histogram, AtomicHistogram, SynchronizedHistogram, IntCountsHistogram, ShortCountsHistogram).
      Parameters:
      buffer - The buffer to decode from
      internalCountsHistogramClass - The class to use for internal counts tracking
      minBarForHighestToLowestValueRatio - Force highestTrackableValue to be set at least this high
      Returns:
      The newly constructed DoubleHistogram
      Throws:
      DataFormatException - on error parsing/decompressing the buffer

    • fromString

      public static DoubleHistogram fromString(String base64CompressedHistogramString) throws DataFormatException
      Construct a new DoubleHistogram by decoding it from a String containing a base64 encoded compressed histogram representation.
      Parameters:
      base64CompressedHistogramString - A string containing a base64 encoding of a compressed histogram
      Returns:
      A DoubleHistogram decoded from the string
      Throws:
      DataFormatException - on error parsing/decompressing the input