CDef

java.lang.Object

org.rrd4j.data.Source

org.rrd4j.data.CDef

All Implemented Interfaces:: NonRrdSource

class CDefextends Source implements NonRrdSource

RRD CDEF (Computed Data Source Definition) implementation.
Creates computed data sources using Reverse Polish Notation (RPN) expressions on existing data sources.

Field Summary
Fields
Modifier and Type
Field
Description
private final String
rpnExpression
The RPN expression that computes this source's values.
Fields inherited from class Source
timestamps, values
Modifier and Type
Field
Description
protected long[]
timestamps
timestamps corresponding to data values
protected double[]
values
data values
Constructor Summary
Constructors
Constructor
Description
CDef(String name, String rpnExpression)
Create a CDef.
Method Summary
Public Methods
Modifier and Type
Method
Description
void
calculate(long tStart, long tEnd, DataProcessor dataProcessor)
Calculates values for the specified time range.
(package private) String
getRpnExpression()
Return the RPN expression for this CDef.
Methods inherited from class Source
getName, getTimestamps, getValues, setTimestamps, setValues
Modifier and Type
Method
Description
(package private) String
getName()
Returns the source name.
(package private) long[]
getTimestamps()
The time, in seconds since the epoch, of each recorded value.
(package private) double[]
getValues()
Returns the data values.
(package private) void
setTimestamps(long[] timestamps)
Sets the timestamps.
(package private) void
setValues(double[] values)
Sets the data values.
Methods inherited from class Object
clone, equals, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait

Field Details
- rpnExpression
  private final String rpnExpression
  The RPN expression that computes this source's values.
Constructor Details
- CDef
  CDef(String name, String rpnExpression)
  Create a CDef.
  Parameters:
  name - the source name
  rpnExpression - the RPN expression
Method Details
- getRpnExpression
  String getRpnExpression()
  Return the RPN expression for this CDef.
  Returns:
  the RPN expression
- calculate
  public void calculate(long tStart, long tEnd, DataProcessor dataProcessor)
  Calculates values for the specified time range.
  Specified by:
  calculate in interface NonRrdSource
  Parameters:
  tStart - start time for calculation
  tEnd - end time for calculation
  dataProcessor - DataProcessor object for accessing other data sources

Field Summary

Fields inherited from class Source

Constructor Summary

Method Summary

Methods inherited from class Source

Methods inherited from class Object

Field Details

rpnExpression

Constructor Details

Method Details

getRpnExpression

calculate