Package org.yamcs.http.api

Class Downsampler

java.lang.Object

org.yamcs.http.api.Downsampler

All Implemented Interfaces:

Consumer<ParameterValueArray>

public class Downsampler
extends Object
implements Consumer<ParameterValueArray>

One-pass downsampler for time-series data (i.e. numeric archived parameters), where the number of recorded data points are not known upfront.

The output is not a bunch of parameter values, but instead a range of values limited to n, which should be fit for inclusion in plots.

Nested Class Summary

Nested Classes

Modifier and Type	Class	Description
static class	Downsampler.Sample	A cumulative sample that keeps track of a rolling average among others.

Constructor Summary

Constructors

Constructor	Description
Downsampler(long start, long stop)
Downsampler(long start, long stop, int sampleCount)

Method Summary

Modifier and Type	Method	Description
void	accept(ParameterValueArray t)
List<Downsampler.Sample>	collect()
long	lastSampleTime()
void	process(long time, double value)
void	process(ParameterValue pval)

Methods inherited from class java.lang.Object

clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait

Methods inherited from interface java.util.function.Consumer

andThen

Constructor Detail

Downsampler

public Downsampler(long start,
                   long stop)

Downsampler

public Downsampler(long start,
                   long stop,
                   int sampleCount)

Method Detail

process

public void process(long time,
                    double value)

collect

public List<Downsampler.Sample> collect()

process

public void process(ParameterValue pval)

lastSampleTime

public long lastSampleTime()

accept

public void accept(ParameterValueArray t)

Specified by:

accept in interface Consumer<ParameterValueArray>