frysk.gui.monitor.observers
Class ObserverManager

java.lang.Object
  frysk.gui.monitor.observers.ObserverManager

public class ObserverManager
extends Object

Only once instance. The purpose of the ObserverManager is to make transparent to the client wether it is using a custom or built in observer. Keeps a list of available observers (custom/built in) Manages observer creation through using prototypes. For known static observers the ObserverManager is responsible for instantiating and adding their prototypes.

Field Summary

private ObservableLinkedList	baseObservers
private ObservableLinkedList	defaultObservers
private Logger	errorLog
private UniqueHashMap	nameHash A table that hashes observer names to their prototypes.
private static File	OBSERVERS_DIR
private File	observersDir
ProgramObserver	programObserver
private ObservableLinkedList	taskObservers a list containing a prototype of every available observer.
static ObserverManager	theManager

Constructor Summary

ObserverManager(File observersDir)

Method Summary

void	addBaseObserverPrototype(ObserverRoot observer)
void	addTaskObserverPrototype(ObserverRoot observer) add the given prototype to the list of available observers.
ObservableLinkedList	getBaseObservers()
ObserverRoot	getBlankObserver()
ObservableLinkedList	getDefaultObservers()
TaskObserverRoot	getObserverByName(String argument)
ObserverRoot	getObserverCopy(ObserverRoot prototype) Returns a copy of the prototype given.
ObservableLinkedList	getTaskObservers() Returns the list of taskObservers available to the @link ObserverManager
void	init()
private void	initTaskObservers() Instantiates each one of the static task observers and adds it to the list.
private void	loadObservers()
boolean	nameIsUsed(String name) Checks of the name of the observer is already in use
void	removeTaskObserverPrototype(ObserverRoot observer) Remove the given prototype to the list of available observers.
void	save()
void	swapTaskObserverPrototype(ObserverRoot toBeRemoved, ObserverRoot toBeAdded) Replace the given ObserverRoot with the other ObserverRoot.
void	tryAddTaskObserverPrototype(ObserverRoot observer, boolean defaultObserver) Tries to add an observer.

Methods inherited from class java.lang.Object

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

Field Detail

OBSERVERS_DIR

private static final File OBSERVERS_DIR

theManager

public static ObserverManager theManager

nameHash

private UniqueHashMap nameHash

A table that hashes observer names to their prototypes. Also used to make sure observer names are unique.

errorLog

private Logger errorLog

taskObservers

private ObservableLinkedList taskObservers

a list containing a prototype of every available observer.

baseObservers

private ObservableLinkedList baseObservers

defaultObservers

private ObservableLinkedList defaultObservers

programObserver

public ProgramObserver programObserver

observersDir

private File observersDir

Constructor Detail

ObserverManager

public ObserverManager(File observersDir)

Method Detail

init

public void init()

initTaskObservers

private void initTaskObservers()

Instantiates each one of the static task observers and adds it to the list.

getObserverCopy

public ObserverRoot getObserverCopy(ObserverRoot prototype)

Returns a copy of the prototype given. A list of available prototypes can be

Parameters:

prototype - a prototype of the observer to be instantiate.

getTaskObservers

public ObservableLinkedList getTaskObservers()

Returns the list of taskObservers available to the @link ObserverManager

Returns:

an @link ObservableLinkedList of TaskObservers

getBaseObservers

public ObservableLinkedList getBaseObservers()

swapTaskObserverPrototype

public void swapTaskObserverPrototype(ObserverRoot toBeRemoved,
                                      ObserverRoot toBeAdded)

Replace the given ObserverRoot with the other ObserverRoot.

Parameters:

toBeRemoved - the observer that will be removed and replaced.

toBeAdded - the observer that will be added in place of the removed observer

getObserverByName

public TaskObserverRoot getObserverByName(String argument)

addTaskObserverPrototype

public void addTaskObserverPrototype(ObserverRoot observer)

add the given prototype to the list of available observers.

Parameters:

observer - the observer prototype to be added.

tryAddTaskObserverPrototype

public void tryAddTaskObserverPrototype(ObserverRoot observer,
                                        boolean defaultObserver)

Tries to add an observer. If there is another version with the same name it assumes the other version is more up to date and doesnt add.

Parameters:

observer -

nameIsUsed

public boolean nameIsUsed(String name)

Checks of the name of the observer is already in use

Parameters:

name - name

Returns:

addBaseObserverPrototype

public void addBaseObserverPrototype(ObserverRoot observer)

removeTaskObserverPrototype

public void removeTaskObserverPrototype(ObserverRoot observer)

Remove the given prototype to the list of available observers.

Parameters:

observer - the observer prototype to be removed.

getBlankObserver

public ObserverRoot getBlankObserver()

loadObservers

private void loadObservers()

save

public void save()

getDefaultObservers

public ObservableLinkedList getDefaultObservers()