stella.util

Class DummySequencer

java.lang.Object

util.PropertyContainer

util.PropertyResources

util.rmi.RmiPropertyContainer

util.rmi.AbstractRmiCaster

stella.CastingContainer

stella.AbstractSequencer

stella.util.DummySequencer

All Implemented Interfaces:

GlobalDepending, Cloneable, Runnable, Remote, Caster, ErrorCaster, ReplySubscriber, Sequencing, CancelRunnable, ExitCleaning, Initializable, PropertySupplying, ResourceSupplying, RmiCaster, RmiPropertyBearing

public class DummySequencer
extends AbstractSequencer
implements ErrorCaster

A class that implements a sequencer for testing the master mind. This sequencer simply waits for the approximated observation time if its start() method is called. For timing, it uses the KEY_TIME parameter provided by the GlobalGrouping instance handed over, thus accelerated times are handled correctly.

To check the scheduler's response on different sequencing results, one can provide a list of error names, KEY_ERRORS that might be generated randomly as a result of the sequencing. The probabilities may be stated with the KEY_ERRORPROSPECTS list. Note that this list is different from KEY_INTERRUPTS.

To check the error handler's response on different errors during the scheduling, one might provide a KEY_INTERRUPTS list. These errors may be produced during a normal sequence and are sent back to the error listeners. Again, the probability of such errors to happen is governed in the KEY_INTERRUPTPROSPECTS list. Note that this list is different from KEY_ERRORS.

Nested Class Summary

Nested classes/interfaces inherited from class util.PropertyResources

PropertyResources.Load, PropertyResources.URLResource

Field Summary

Fields

Modifier and Type	Field and Description
private boolean	cancel The prematurely stop the sequencer.
private static long	DEFDURATION The default duration.
private static int	DEFSTEP The default duration.
private static String	DEFTIME The default time parameter.
private long	duration The estimated observation time of the target.
private static String	ERRORPACKAGE The package-path to the error events.
private Map	errors The map of the error-event results.
private Map	interrupts The map of the error interrupts.
static String	KEY_DURATION The duration to use for a target if not explicetly given.
static String	KEY_ERRORPROSPECTS The time to use from the parameters for sleeps.
static String	KEY_ERRORS The time to use from the parameters for sleeps.
static String	KEY_INTERRUPTPROSPECTS The time to use from the parameters for sleeps.
static String	KEY_INTERRUPTS The time to use from the parameters for sleeps.
static String	KEY_STEP The choping intervall for the duration to derive a sleep time.
static String	KEY_TIME The time to use from the parameters for sleeps.
private Thread	mythread The thread this sequencer runs in.
private static String	NOERROR The place holder for a null-error event.
private GlobalGrouping	set Reference to the parameters.
private Value	time The time value.

Fields inherited from class util.rmi.AbstractRmiCaster

ALTERNATEHOST, ALTERNATEPORT, KEY_BINDNAME, 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 util.PropertySupplying

CONFIG, KEY_CLASS

Fields inherited from interface util.ResourceSupplying

KEY_URLRESOURCES, KEY_URLUSECONFIG, KEY_URLUSECURRENT, KEY_URLUSEHOME

Constructor Summary

Constructors

Constructor and Description
DummySequencer(Map prop) Constructs a new dummy sequencer.

Method Summary

Modifier and Type	Method and Description
void	abort(List dummy) Abort sequence, not necessary.
void	append(List dummy) Append to sequence, not necessary.
void	cancel() Cancels the execution of the sequencer.
void	forward(ReplyEvent re) This method is called from reply deliverers.
private ErrorEvent	generateErrorEvent(Map errs) Generates an error event out of a map of available error event names.
Thread	getAsociatedThread() Always return a reference to mythread.
private static Map	getErrorMap(String errorlist, String problist) Returns an error map linking error names to probabilities.
List	getStepsForTarget(TargetDefinition aux) Returns an empty list.
Thread	getThread() Returns the sequencer thread.
private long	getTime() Returns the time.
boolean	isCancel() Returns the cancel flag.
void	load(List dummy) Not necessary, returns immediately.
long	maxTimeToCancel() Returns 1000.
void	prepend(List dummy) Prepend to sequence, not necessary.
void	registerGlobals(GlobalGrouping cluster) Registers the parameter set.
void	registerLauncher(CommandLaunching[] launch) Register the command launchers.
void	registerRender(CommandRendering dummy) Register command renderer.
void	run() The run method of the dummy sequencer.
Thread	start() Starts the sequence.
ErrorEvent	success() Queries the result of a sequencing procedure.

Methods inherited from class stella.AbstractSequencer

createSequencer

Methods inherited from class stella.CastingContainer

addErrorListener, addRmiErrorListener, exit, init, isValid, notifyErrorListener, removeErrorListener, removeRmiErrorListener, sendError, sendError, sendError, sendStatus, sendStatus, sendStatus

Methods inherited from class util.rmi.AbstractRmiCaster

bindToRegistry, bindToRegistry, bindToRegistry, bindToRegistry, bindToRegistry, bindToRegistry, casterExit, casterExit, getBindName, getBindName, 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, toString

Methods inherited from class java.lang.Object

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

Methods inherited from interface stella.ErrorCaster

addErrorListener, removeErrorListener

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_TIME

public static final String KEY_TIME

The time to use from the parameters for sleeps.

See Also:

Constant Field Values

KEY_DURATION

public static final String KEY_DURATION

The duration to use for a target if not explicetly given.

See Also:

Constant Field Values

KEY_STEP

public static final String KEY_STEP

The choping intervall for the duration to derive a sleep time.

See Also:

Constant Field Values

KEY_ERRORS

public static final String KEY_ERRORS

The time to use from the parameters for sleeps.

See Also:

Constant Field Values

KEY_ERRORPROSPECTS

public static final String KEY_ERRORPROSPECTS

The time to use from the parameters for sleeps.

See Also:

Constant Field Values

KEY_INTERRUPTS

public static final String KEY_INTERRUPTS

The time to use from the parameters for sleeps.

See Also:

Constant Field Values

KEY_INTERRUPTPROSPECTS

public static final String KEY_INTERRUPTPROSPECTS

The time to use from the parameters for sleeps.

See Also:

Constant Field Values

DEFTIME

private static final String DEFTIME

The default time parameter.

See Also:

Constant Field Values

DEFDURATION

private static final long DEFDURATION

The default duration.

See Also:

Constant Field Values

DEFSTEP

private static final int DEFSTEP

The default duration.

See Also:

Constant Field Values

NOERROR

private static final String NOERROR

The place holder for a null-error event.

See Also:

Constant Field Values

ERRORPACKAGE

private static final String ERRORPACKAGE

The package-path to the error events.

See Also:

Constant Field Values

set

private GlobalGrouping set

Reference to the parameters. Needed for observation time retrieval.

time

private Value time

The time value.

errors

private final Map errors

The map of the error-event results. Erros are keys, probabilites vals.

interrupts

private final Map interrupts

The map of the error interrupts. Erros are keys, probabilites vals.

duration

private long duration

The estimated observation time of the target. Equals sleep time.

cancel

private boolean cancel

The prematurely stop the sequencer.

mythread

private Thread mythread

The thread this sequencer runs in.

Constructor Detail

DummySequencer

public DummySequencer(Map prop)

Constructs a new dummy sequencer. If at least one of the KEY_ERRORS or the KEY_INTERRUPTS is given, the probabilities for the occurence of such an error is calcualted in the following way:

• If the probabilities are explicetly given, KEY_ERRORPROSPECTS or KEY_INTERRUPTPROSPECTS, the probability for a null-error event is calculated from the remaining probability to one.
• If no probabilities are given, the number of errors stated plus the null-error event are used to derive an equally-distributed probability.
• Never state a null-error event or its probability!

Method Detail

getStepsForTarget

public List getStepsForTarget(TargetDefinition aux)

Returns an empty list. No sequencing steps are needed for a dummy sequencer. Stores the observation time of the target, if this target is Appointable.

Specified by:

getStepsForTarget in interface Sequencing

load

public void load(List dummy)

Not necessary, returns immediately.

Specified by:

load in interface Sequencing

abort

public void abort(List dummy)

Abort sequence, not necessary. For testing, this list may be dumped to some output.

Specified by:

abort in interface Sequencing

append

public void append(List dummy)

Append to sequence, not necessary.

Specified by:

append in interface Sequencing

prepend

public void prepend(List dummy)

Prepend to sequence, not necessary.

Specified by:

prepend in interface Sequencing

registerRender

public void registerRender(CommandRendering dummy)

Register command renderer. Not needed.

Specified by:

registerRender in interface Sequencing

registerLauncher

public void registerLauncher(CommandLaunching[] launch)

Register the command launchers. Not needed.

Specified by:

registerLauncher in interface Sequencing

registerGlobals

public void registerGlobals(GlobalGrouping cluster)

Registers the parameter set. Only needed for the time. If the time is not found in the parameters, the system clock is used.

Specified by:

registerGlobals in interface GlobalDepending

start

public Thread start()

Starts the sequence. Simply wraps a thread over this runnable instance, starts it and returns the thread reference. Stores the thread reference internally for getThread() method.

Specified by:

start in interface Sequencing

Returns:

The thread that has just been started

getThread

public Thread getThread()

Returns the sequencer thread. If the sequncer is not running, i.e. the sequncer's thread is not alive, this method returns null.

getAsociatedThread

public Thread getAsociatedThread()

Always return a reference to mythread.

Specified by:

getAsociatedThread in interface CancelRunnable

maxTimeToCancel

public long maxTimeToCancel()

Returns 1000.

Specified by:

maxTimeToCancel in interface CancelRunnable

success

public ErrorEvent success()

Queries the result of a sequencing procedure. Depending on the values of the KEY_ERRORS and KEY_ERRORPROSPECTS keys, this method returns an error event or null.

cancel

public void cancel()

Cancels the execution of the sequencer.

Specified by:

cancel in interface CancelRunnable

isCancel

public boolean isCancel()

Returns the cancel flag.

Specified by:

isCancel in interface Sequencing

forward

public void forward(ReplyEvent re)

This method is called from reply deliverers. We do not have any, therefore this method will never be called.

Specified by:

forward in interface ReplySubscriber

run

public void run()

The run method of the dummy sequencer. This method only waits until the estimated observation time has passed. But it does that in a certain way.

• From the observing time, duration a sleep time for this thread is generated by deviding the duration through KEY_STEP. This is necessary if the time used in the parameters is an accelerated one and we cannot sleep for the entire observation time.
• On first wake-up, an error may be sent back to subscribed error listeners, depending on KEY_INTERRUPTS. We must use the first wake-up, because this may already be the last one.
• After a comparison between the starting time provided by the time parameter and the current time, we may sleep again or return.
• The outcome of the sequence is retrieved with a call to success().

Specified by:

run in interface Runnable

getErrorMap

private static final Map getErrorMap(String errorlist,
                                     String problist)

Returns an error map linking error names to probabilities. If no error names are handed over in the comma-separated string of the first argument, only the null-error-event is valid.
Note that all error names must be class names in the stella.error package.

Parameters:

errorlist - A coma-separated list of error class names.

problist - A coma-separated list of probabilites to errors above.

generateErrorEvent

private ErrorEvent generateErrorEvent(Map errs)

Generates an error event out of a map of available error event names. The procedure is as follows:

• A random number is generated.
• We iterate through the entries in the map, the values of the mapping are representative double probabilities.
• As long as the random double is higher as the sum of the values, we proceed iterating.
• As the probabilites sum reaches the random number, the key of the mapping is taken as the name of an error event class in the stella.error package.
• A new error event is generated and returned using a this reference in the constructor of the error event. If the chosen reference points to NOERROR, null is returned.

getTime

private long getTime()

Returns the time. If the parameter set contained a time parameter matching KEY_TIME, its value is used, otherwise the system time is returned.