globals.value

Class ShelfStatistic

java.lang.Object

util.PropertyContainer

util.PropertyResources

globals.parameter.AbstractParameter

globals.value.AbstractValue

globals.value.ShelfStatistic

All Implemented Interfaces:

Parameter, Value, Cloneable, ExitCleaning, Initializable, PropertySupplying, ResourceSupplying

Direct Known Subclasses:

SensorShelf, ShelfStatistic.Average, ShelfStatistic.Maximum, ShelfStatistic.Minimum, ShelfStatistic.Test

public abstract class ShelfStatistic
extends AbstractValue

This class hooks on to a shelf to generate minima/maxima or averages. The intended use is to hook this parameter to a DataCaster that is permanently generating data. Retrieving the value is either minima, maxima or average. It is similar to a SensorStatistic, but provides not that much of an overhead.

Nested Class Summary

Nested Classes

Modifier and Type	Class and Description
static class	ShelfStatistic.Average Useable class returning the average.
static class	ShelfStatistic.Maximum Useable class returning the average.
static class	ShelfStatistic.Minimum Useable class returning the average.
static class	ShelfStatistic.Test Test class.

Nested classes/interfaces inherited from class util.PropertyResources

PropertyResources.Load, PropertyResources.URLResource

Field Summary

Fields

Modifier and Type	Field and Description
private double	average The current average.
private static boolean	DEFNOMINMAX The default choice for ignoring minima maxima calculation.
private static int	DEFSHELFSIZE The length of the average cycle.
private static int	DEFTHRESHOLD The minimum length of the shelf to return valid values.
static String	KEY_NOMINMAX If this boolean is set, minima/maxima are not updated.
static String	KEY_SHELFSIZE The length of the average cycle.
static String	KEY_THRESHOLD The minimum length of the shelf to return valid values.
private double	maxima The current maxima.
private double	minima The current minima.
private Shelf<Number>	numbers A list of numbers gathered from the data source.

Fields inherited from class globals.parameter.AbstractParameter

KEY_FORMAT, KEY_NAME, KEY_PRESERVE, UNKNOWN

Fields inherited from class util.PropertyResources

KEY_NOINITONCREATE, POSTFIX_ALPHABET, POSTFIX_BYTES, POSTFIX_DIR, POSTFIX_EXT, POSTFIX_FILE, POSTFIX_LIST, POSTFIX_MODTIME, POSTFIX_URL

Fields inherited from class util.PropertyContainer

KEY_LISTSEPARATOR, KEY_MAPKEYVALUECHAR, KEY_MAPSEPARATOR

Fields inherited from interface util.PropertySupplying

CONFIG, KEY_CLASS

Fields inherited from interface util.ResourceSupplying

KEY_URLRESOURCES, KEY_URLUSECONFIG, KEY_URLUSECURRENT, KEY_URLUSEHOME

Constructor Summary

Constructors

Modifier	Constructor and Description
protected	ShelfStatistic(Map<String,String> prop) Constructs a new shelf-based statistics sensor.

Method Summary

Modifier and Type	Method and Description
void	clear() Clears the shelf data on request.
protected Number	getAverage() From all accumulated numbers, get the average.
protected Number	getMaximum() From all accumulated numbers, get the maximum.
protected Number	getMinimum() From all accumulated numbers, get the maximum.
boolean	isValid() A statistiv parameter is valid, if its numbers collected exceeds the validity threshold.
private void	scanMinMax() If we removed the minima or the maxima from our shelf, and this value is no longer present in the data shelf, we have to scan the entire shelf for the new minima and maxima.
Number	setValue(Number add) Adds a number to the shelf statistic.

Methods inherited from class globals.value.AbstractValue

get, set

Methods inherited from class globals.parameter.AbstractParameter

createParameter, delivers, exit, getFormatted, getFormatted, getName, getPreserveFile, getString, getString, init, overrideDefaultName, register, rescanned, setName, toString

Methods inherited from class util.PropertyResources

clone, createFrom, createFrom, createFrom, createInstance, getApplet, getAsResources, getLocate, getPropertiesToKey, getPropertiesToKey, getResource, getResourceAsStream, getResourceFromKey, getResources, hasLocalURLs, initProperties, keyCreate, keyCreate, reload, setApplet

Methods inherited from class util.PropertyContainer

augment, augment, augment, augment, augment, defaultBoolean, defaultChar, defaultDouble, defaultFloat, defaultInt, defaultLong, defaultObject, defaultObject, defaultProperties, defaultProperty, getAsBoolean, getAsChar, getAsDouble, getAsEnums, getAsFloat, getAsInt, getAsList, getAsLong, getAsMap, getAsMap, getAsObject, getAsObject, getProperties, getProperty, has, isNew, parseObject, parseObject, reload, removeProperty, requires, setObject, setProperties, setProperty, stringProperties

Methods inherited from class java.lang.Object

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

Methods inherited from interface globals.Value

getValue

Methods inherited from interface globals.Parameter

getFormatted, getName, getString

Methods inherited from interface util.PropertySupplying

defaultBoolean, defaultChar, defaultDouble, defaultFloat, defaultInt, defaultLong, defaultObject, defaultObject, defaultProperties, defaultProperty, getAsBoolean, getAsChar, getAsDouble, getAsFloat, getAsInt, getAsList, getAsLong, getAsMap, getAsObject, getAsObject, getProperties, getProperty, has, parseObject, removeProperty, setObject, setProperty, stringProperties

Methods inherited from interface util.Initializable

init

Field Detail

KEY_SHELFSIZE

public static final String KEY_SHELFSIZE

The length of the average cycle. Counts not time, but events.

See Also:

Constant Field Values

KEY_THRESHOLD

public static final String KEY_THRESHOLD

The minimum length of the shelf to return valid values.

See Also:

Constant Field Values

KEY_NOMINMAX

public static final String KEY_NOMINMAX

If this boolean is set, minima/maxima are not updated.

See Also:

Constant Field Values

DEFSHELFSIZE

private static final int DEFSHELFSIZE

The length of the average cycle. Counts not time, but events.

See Also:

Constant Field Values

DEFTHRESHOLD

private static final int DEFTHRESHOLD

The minimum length of the shelf to return valid values.

See Also:

Constant Field Values

DEFNOMINMAX

private static final boolean DEFNOMINMAX

The default choice for ignoring minima maxima calculation.

See Also:

Constant Field Values

numbers

private final Shelf<Number> numbers

A list of numbers gathered from the data source.

minima

private double minima

The current minima.

maxima

private double maxima

The current maxima.

average

private double average

The current average.

Constructor Detail

ShelfStatistic

protected ShelfStatistic(Map<String,String> prop)

Constructs a new shelf-based statistics sensor.

Method Detail

clear

public void clear()

Clears the shelf data on request.

setValue

public Number setValue(Number add)

Adds a number to the shelf statistic. This is the receiving end of this parameter to add new measurements. The number returned is the recently removed shelf object.

getAverage

protected Number getAverage()

From all accumulated numbers, get the average.

getMaximum

protected Number getMaximum()

From all accumulated numbers, get the maximum.

getMinimum

protected Number getMinimum()

From all accumulated numbers, get the maximum.

isValid

public boolean isValid()

A statistiv parameter is valid, if its numbers collected exceeds the validity threshold.

scanMinMax

private void scanMinMax()

If we removed the minima or the maxima from our shelf, and this value is no longer present in the data shelf, we have to scan the entire shelf for the new minima and maxima. This is the only time-consuming part in the sensor, but its handable.