stella.sensor

Class DataSensor

java.lang.Object

util.PropertyContainer

util.PropertyResources

util.rmi.RmiPropertyContainer

util.rmi.AbstractRmiCaster

stella.sensor.AbstractSensor

stella.sensor.TimerTaskSensor

stella.sensor.DataSensor

All Implemented Interfaces:

Cloneable, Remote, Caster, DataCaster, RmiDataCaster, RmiErrorCaster, Telemetering, ExitCleaning, Initializable, PropertySupplying, ResourceSupplying, RmiCaster, RmiPropertyBearing

Direct Known Subclasses:

CumulativeSensor

public abstract class DataSensor
extends TimerTaskSensor
implements RmiDataCaster, DataCaster

A sensor that produces data events. The main difference to its superclass is the ability of this sensor to pack the data generated and pass them as an DataEvent to its registered listeners. On construct, it scans its property argument for the availability of KEY_REPORT, which should be mapped to an integer describing the number of individual data points to omit on listener notification. A value of zero means that data event generating is prohibited. If this key is not present, it defaults to DEFREPORT which is normally 10. As soon as the desired number of measurments is available, the run methods fork to the report() subroutine, which generates the data events and passes them to the registered listeners. Please ensure that the listeners method return immediately, otherwise some measurements will be lost. If a listener needs heavy processing of data, use a new thread instead.

This sensor adds the following properties if they are not set already (needs updating!):

• pack (10): The packing rate for generating data events.
• binddata (false): If true the DataCaster functionality is automatically bound.

Version:

1.2, 05/03/01

Author:

Dr. Thomas Granzer

Nested Class Summary

Nested classes/interfaces inherited from class stella.sensor.TimerTaskSensor

TimerTaskSensor.SensorRead

Nested classes/interfaces inherited from class util.PropertyResources

PropertyResources.Load, PropertyResources.URLResource

Field Summary

Fields

Modifier and Type	Field and Description
private int	count An integer counting the execution number.
private Vector	datalist The list of DataListeners.
(package private) static DecimalFormat	DEFRAWFORMAT The default raw format String.
(package private) static int	DEFREPORT The default report rate.
(package private) static DecimalFormat	DEFSIGMAFORMAT The default format string for the values.
static String	KEY_RAWFORMAT The key in the Map referring to the raw data format.
static String	KEY_REPORT The name of the key for the report rate in this sensors properties.
static String	KEY_SIGMAFORMAT The key to the sigma-format string.
private NumberFormat	rawform The decimal format for the raw values.
private int	reportrate The packing rate.
private NumberFormat	sigform The decimal format for the raw sigma values.

Fields inherited from class stella.sensor.TimerTaskSensor

KEY_LOGRAWABOVE, KEY_LOGRAWBELOW, KEY_LOGREADLAG, KEY_RESPAWN

Fields inherited from class stella.sensor.AbstractSensor

KEY_BIND, KEY_BINDNAME, KEY_CONVERT, KEY_DESCRIPTION, KEY_SENSORNAME

Fields inherited from class util.rmi.AbstractRmiCaster

ALTERNATEHOST, ALTERNATEPORT, KEY_EXPORTPORT, KEY_REGISTRYHOST, KEY_REGISTRYPORT

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 stella.rmi.RmiDataCaster

NAMING_EXTENSION

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	DataSensor(Map qualify) Constructs a fully-qualified data sensor.

Method Summary

Modifier and Type	Method and Description
void	addDataListener(DataListener ear) Adds a DataListener to the registered listeners.
void	addRmiDataListener(RmiDataListener ear) Adds a DataListener to the registered listeners.
protected void	conductOneMeasure() The modified version of the conductOneMeasure() method.
void	exit() Unbind from registry, if bound.
protected DataEvent	generateDataEvent() Takes the last sensor reading and produces a RawDataEvent out of it.
NumberFormat	getRawFormat() Returns the decimal format of the raw value.
NumberFormat	getSigmaFormat() Returns the decimal format of the sigma of the raw value.
void	removeDataListener(DataListener ear) Removes a DataListener from the registered listeners.
void	removeRmiDataListener(RmiDataListener ear) Removes a DataListener from the registered listeners.
protected void	report() This method is called repeatedly within the normal execution of this thread.

Methods inherited from class stella.sensor.TimerTaskSensor

cancel, equals, getRawToggleInfo, getReading, getRespawn, getTimeOfRead, hashCode, initSensorTimerTask, isReady, newData, readSensor, regetRaw, setTimeOfRead, validReading

Methods inherited from class stella.sensor.AbstractSensor

addRmiErrorListener, createSensor, getBindName, getConvert, getSensorDescription, getSensorInitInfo, getSensorName, init, notifyErrorListener, removeRmiErrorListener, setConvert, status, toString

Methods inherited from class util.rmi.AbstractRmiCaster

bindToRegistry, bindToRegistry, bindToRegistry, bindToRegistry, bindToRegistry, bindToRegistry, casterExit, casterExit, getBindName, isValid, unbindFromRegistry, unbindFromRegistry

Methods inherited from class util.rmi.RmiPropertyContainer

containsRemoteProperty, getRemoteProperties, getRemoteProperty, setRemoteProperty

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, rescanned, setObject, setProperties, setProperty, stringProperties

Methods inherited from class java.lang.Object

finalize, getClass, notify, notifyAll, wait, wait, wait

Methods inherited from interface util.rmi.RmiCaster

bindToRegistry, isValid, unbindFromRegistry

Methods inherited from interface stella.sensor.Telemetering

validReading

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

Field Detail

KEY_REPORT

public static final String KEY_REPORT

The name of the key for the report rate in this sensors properties.

See Also:

Constant Field Values

KEY_RAWFORMAT

public static final String KEY_RAWFORMAT

The key in the Map referring to the raw data format.

See Also:

Constant Field Values

KEY_SIGMAFORMAT

public static final String KEY_SIGMAFORMAT

The key to the sigma-format string.

See Also:

Constant Field Values

DEFREPORT

static final int DEFREPORT

The default report rate.

See Also:

Constant Field Values

DEFRAWFORMAT

static final DecimalFormat DEFRAWFORMAT

The default raw format String.

DEFSIGMAFORMAT

static final DecimalFormat DEFSIGMAFORMAT

The default format string for the values.

datalist

private transient Vector datalist

The list of DataListeners.

count

private int count

An integer counting the execution number.

reportrate

private final int reportrate

The packing rate.

rawform

private final NumberFormat rawform

The decimal format for the raw values.

sigform

private final NumberFormat sigform

The decimal format for the raw sigma values.

Constructor Detail

DataSensor

protected DataSensor(Map qualify)

Constructs a fully-qualified data sensor. The name and the default respawn time and the default pack size are used to either construct a default Map object, or add this keys if not present in the Map object. Use of this constructor guarantees that the Map keys name, respawn, and pack are always set.

Parameters:

size - The maximum number of measurments to keep.

group - The ThreadGroup this thread belongs to.

name - The name of this thread (sensor).

qualify - The Map object describing this sensor.

Method Detail

exit

public void exit()

Unbind from registry, if bound. Signal data listeners that they should fuck off.

Specified by:

exit in interface ExitCleaning

Overrides:

exit in class AbstractSensor

addDataListener

public void addDataListener(DataListener ear)

Adds a DataListener to the registered listeners. If the argument is null, nothing is changed.

Specified by:

addDataListener in interface DataCaster

Parameters:

ear - The listener to add.

removeDataListener

public void removeDataListener(DataListener ear)

Removes a DataListener from the registered listeners. If the argument is null, nothing is changed.

Specified by:

removeDataListener in interface DataCaster

Parameters:

ear - The listener to remove.

addRmiDataListener

public void addRmiDataListener(RmiDataListener ear)
                        throws RemoteException

Adds a DataListener to the registered listeners. If the argument is null, nothing is changed.

Specified by:

addRmiDataListener in interface RmiDataCaster

Parameters:

ear - The listener to add.

Throws:

RemoteException

removeRmiDataListener

public void removeRmiDataListener(RmiDataListener ear)
                           throws RemoteException

Removes a DataListener from the registered listeners. If the argument is null, nothing is changed.

Specified by:

removeRmiDataListener in interface RmiDataCaster

Parameters:

ear - The listener to remove.

Throws:

RemoteException

getRawFormat

public NumberFormat getRawFormat()

Returns the decimal format of the raw value.

getSigmaFormat

public NumberFormat getSigmaFormat()

Returns the decimal format of the sigma of the raw value.

conductOneMeasure

protected void conductOneMeasure()

The modified version of the conductOneMeasure() method. Additionally to the readout of the sensor, the method report() is called as soon as the desired number of data points is present. If the pack rate is zero or negative this sensor does not export its reading as data events.

Overrides:

conductOneMeasure in class TimerTaskSensor

report

protected void report()

This method is called repeatedly within the normal execution of this thread. Depending on the report rate, defined by the KEY_REPORT property, this occurs on integer multiples of the readout time.

In the default behaviour, a RawDataEvent is generated and passed to all registered listeners. Please note that it is important that the listener's DataListener.dataAvailable(stella.DataEvent) returns immediately, otherwise some reading cycles will be skipped. No data is reported if the generateDataEvent() returns null.

generateDataEvent

protected DataEvent generateDataEvent()

Takes the last sensor reading and produces a RawDataEvent out of it. The error of the measurement is set to zero.