stella.globals

Class TelescopeError

java.lang.Object

util.PropertyContainer

util.PropertyResources

globals.parameter.AbstractParameter

globals.parameter.AbstractCachedParameter

stella.globals.AbstractStatusRequestor

stella.globals.TelescopeError

All Implemented Interfaces:

Parameter, Cloneable, Caster, ErrorCaster, ErrorDependingParameter, StatusRequesting, ExitCleaning, Initializable, PropertySupplying, Reloadable, ResourceSupplying

public class TelescopeError
extends AbstractStatusRequestor
implements ErrorCaster, Reloadable

A class that uses incoming TelescopeStatus errors to deduce eventually occuring telescope errors. This is done by scanning the TelescopeStatus.getErrors() return as a comma-separated list of PILAR-specific errors. Each error encountered is matched to an internal lookup-table of PILAR error-names to SCS error-classes in KEY_TABLELIST or KEY_TABLEFILE. If a match is found, an appropriate error class is instantiated and passed to registered error-listeners (a error-handler presumably).

As this parameter is of a polling-type, the cache-time of the parent class is used as the polling-time. The value of the parameter are the list of currently active 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 static String	DEFCOMMAND The default class name of the status command to send.
static String	DEFNAME The default name of this parameter.
private static long	DEFPOLLTIME The default poll time.
private static String	DEFTABLELIST The home position of the telescope.
private static long	DEFWAIT The default wait time.
private List<ErrorListener>	ear The list of registered error listeners.
static String	KEY_POLLTIME The polling time.
static String	KEY_TABLEFILE The table of PILAR error-names to SCS error-classes.
static String	KEY_TABLELIST The table of PILAR error-names to SCS error-classes.
static String	KEY_WAIT The initial wait time.
private Map<String,ErrorEvent>	pilar The look-up table matching PILAR names to true error objects.
private Timer	request The timer used for issuing status requests.

Fields inherited from class stella.globals.AbstractStatusRequestor

KEY_COMMAND, KEY_DISABLE, KEY_TIMEOUT

Fields inherited from class globals.parameter.AbstractCachedParameter

KEY_CACHE

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 stella.ErrorDependingParameter

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

Constructor and Description
TelescopeError(Map<String,String> prop) Constructs a new telescope-error parameter.

Method Summary

Modifier and Type	Method and Description
void	addErrorListener(ErrorListener handler) Registers an error event listener to this property container.
private void	check() Checks if the currently valid errors stored in the cache are recognized and should spark a error-handler notification.
private Map<String,ErrorEvent>	constructTable()
void	exit() Exits this parameter.
Object	getForError(ErrorEvent ee) Returns the pilar-errors of the telescope deduced from a freshly received TelescopeStatus.
void	init() Initializes the telescope error parameter.
protected boolean	isStatusRequested(ErrorEvent ee) Returns true if the error event received is of TelescopeStatus
protected void	notifyErrorListeners(ErrorEvent ee) Notifies all registered ErrorListeners.
boolean	registerLauncher(CommandLaunching launch) Registers the appropriate command caster that can handle the appropriate request.
void	removeErrorListener(ErrorListener handler) Deregisters an error event listener from this property container.
double	rescanned(String key, String old, String newval) Returns zero if the polltime or wait period changed, reload the error lookup table if the tablelist or file changed.

Methods inherited from class stella.globals.AbstractStatusRequestor

getUncached, registerError

Methods inherited from class globals.parameter.AbstractCachedParameter

get, getCache, getCacheFormatted, set

Methods inherited from class globals.parameter.AbstractParameter

createParameter, delivers, getFormatted, getFormatted, getName, getPreserveFile, getString, getString, overrideDefaultName, register, 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 util.Reloadable

reload

Methods inherited from interface stella.StatusRequesting

getCache, getCacheFormatted

Methods inherited from interface globals.Parameter

get, getFormatted, getName, getString, set

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_WAIT

public static final String KEY_WAIT

The initial wait time. Can be quite high.

See Also:

Constant Field Values

KEY_POLLTIME

public static final String KEY_POLLTIME

The polling time. Must be higher then cache time.

See Also:

Constant Field Values

KEY_TABLELIST

public static final String KEY_TABLELIST

The table of PILAR error-names to SCS error-classes.

See Also:

Constant Field Values

KEY_TABLEFILE

public static final String KEY_TABLEFILE

The table of PILAR error-names to SCS error-classes.

See Also:

Constant Field Values

DEFNAME

public static final String DEFNAME

The default name of this parameter.

See Also:

Constant Field Values

DEFWAIT

private static final long DEFWAIT

The default wait time.

See Also:

Constant Field Values

DEFPOLLTIME

private static final long DEFPOLLTIME

The default poll time.

See Also:

Constant Field Values

DEFTABLELIST

private static final String DEFTABLELIST

The home position of the telescope. Value adopted at construct.

See Also:

Constant Field Values

DEFCOMMAND

private static final String DEFCOMMAND

The default class name of the status command to send.

See Also:

Constant Field Values

pilar

private Map<String,ErrorEvent> pilar

The look-up table matching PILAR names to true error objects.

ear

private List<ErrorListener> ear

The list of registered error listeners.

request

private Timer request

The timer used for issuing status requests.

Constructor Detail

TelescopeError

public TelescopeError(Map<String,String> prop)

Constructs a new telescope-error parameter. In the init section, the look-up table is constructed. The status-request timer is only started once the appropriate command caster is registered.

Method Detail

init

public void init()
          throws InitException

Initializes the telescope error parameter. The look-up table is constructed, either using the KEY_TABLEFILE property to load a properties file, or, if this key is missing, the KEY_TABLELIST is used to convert the mapped string to a properties object with the Strings.propertize(java.lang.String) mthod.

Specified by:

init in interface Initializable

Overrides:

init in class AbstractStatusRequestor

Throws:

InitException

rescanned

public double rescanned(String key,
                        String old,
                        String newval)

Returns zero if the polltime or wait period changed, reload the error lookup table if the tablelist or file changed.

Specified by:

rescanned in interface Reloadable

Overrides:

rescanned in class AbstractStatusRequestor

constructTable

private Map<String,ErrorEvent> constructTable()

registerLauncher

public boolean registerLauncher(CommandLaunching launch)

Registers the appropriate command caster that can handle the appropriate request. If the registering is successful, a timer requesting continuosely the telescope status is constructed and started.

Specified by:

registerLauncher in interface StatusRequesting

Overrides:

registerLauncher in class AbstractStatusRequestor

Returns:

True, if this is the coorect command launcher.

getForError

public Object getForError(ErrorEvent ee)

Returns the pilar-errors of the telescope deduced from a freshly received TelescopeStatus. This method should be followed by a check() call which actually performs the test for errors.

Specified by:

getForError in interface ErrorDependingParameter

exit

public void exit()

Exits this parameter. This cancels the timer task.

Specified by:

exit in interface ExitCleaning

Overrides:

exit in class AbstractParameter

addErrorListener

public void addErrorListener(ErrorListener handler)

Registers an error event listener to this property container. This method is used for local listeners.

Specified by:

addErrorListener in interface ErrorCaster

removeErrorListener

public void removeErrorListener(ErrorListener handler)

Deregisters an error event listener from this property container. This method is used for local listeners.

Specified by:

removeErrorListener in interface ErrorCaster

notifyErrorListeners

protected void notifyErrorListeners(ErrorEvent ee)

Notifies all registered ErrorListeners. This method parses through the Vector of ErrorListeners and passes the argument to their errorOccured method. Registered listeners are local.

Parameters:

ee - The ErrorEvent to pass to the Listeners.

isStatusRequested

protected boolean isStatusRequested(ErrorEvent ee)

Returns true if the error event received is of TelescopeStatus

Specified by:

isStatusRequested in class AbstractStatusRequestor

check

private void check()

Checks if the currently valid errors stored in the cache are recognized and should spark a error-handler notification.