org.yamcs.web.rest.archive

Class RestDownsampler

java.lang.Object

org.yamcs.web.rest.archive.RestDownsampler

public class RestDownsampler
extends Object

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.

This is *NOT* perfect. The range of returned items is not known upfront, so a rough assumption is made based on the first result, and up until validEnd.

Nested Class Summary

Nested Classes

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

Constructor Summary

Constructors

Constructor and Description
RestDownsampler(long projectedEnd)
RestDownsampler(long projectedEnd, int intervalCount)

Method Summary

Modifier and Type	Method and Description
List<RestDownsampler.Sample>	collect()
long	lastSampleTime()
void	process(long time, double value) Assumes timesorted processing, as the first entry will be used to determine the time spread of the buckets, up until validEnd.
void	process(ParameterValue pval)

Methods inherited from class java.lang.Object

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

Constructor Detail

RestDownsampler

public RestDownsampler(long projectedEnd)

RestDownsampler

public RestDownsampler(long projectedEnd,
                       int intervalCount)

Method Detail

process

public void process(long time,
                    double value)

Assumes timesorted processing, as the first entry will be used to determine the time spread of the buckets, up until validEnd. :-/

collect

public List<RestDownsampler.Sample> collect()

process

public void process(ParameterValue pval)

lastSampleTime

public long lastSampleTime()