edu.mit.sketch.system
Class BlackboardSystem

java.lang.Object
  |
  +--edu.mit.sketch.system.BlackboardSystem

public class BlackboardSystem

extends Object

This is the blackboard system, which includes the three major components of a blackboard architecture:

• The blackboard itself to hold the data #m_blackboard
• The scheduler
• The Knowledge Sources

The newUserInput method is the entry point of all user generated items into the system (i.e. strokes and utterances).

Created: Tue Nov 20 15:52:44 2001
Copyright: Copyright (C) 2001 by MIT. All Rights Reserved.

Field Summary

protected List

m_newItemQueue Queue's up the new items as they come into the system.

Constructor Summary

BlackboardSystem()

Method Summary

void	addBlackboardObserver(Observer o)
void	addPackage(RecPackage pkg) Add a package complete with shape models and knowledge sources to the system.
void	addSchedulerObserver(Observer o)
Blackboard	getBlackboard()
KnowledgeSourceManager	getKSManager()
boolean	hasNewUserInput() A funtion that returns whether or not there are new user inputs that have not yet been added to the blackboard.
void	newUserInput(BBItem item) This is the entry point of new items into the system.
void	setScheduler(Scheduler scheduler) Set the scheduler object.
String	toString()

Methods inherited from class java.lang.Object

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

Field Detail

m_newItemQueue

protected List m_newItemQueue

Queue's up the new items as they come into the system. IMPORTANT: When iterating over this list you must synchronize on the list itself. e.g.

 synchronized(m_newItemQueue) {
   Iterator i = m_newItemQueue.iterator();
   while (i.hasNext())
     foo(i.next());
 }
 

This will ensure that access to the queue is synchronized.

Constructor Detail

BlackboardSystem

public BlackboardSystem()

Method Detail

setScheduler

public void setScheduler(Scheduler scheduler)

Set the scheduler object.

newUserInput

public void newUserInput(BBItem item)

This is the entry point of new items into the system. This should be called by the UI code when it needs to introduce new data produced directly by the user. The item will be placed in a queue until the next convenient time when they can be added to the actual blackboard.

hasNewUserInput

public boolean hasNewUserInput()

A funtion that returns whether or not there are new user inputs that have not yet been added to the blackboard.

addPackage

public void addPackage(RecPackage pkg)

Add a package complete with shape models and knowledge sources to the system. The shape models are added to the model manager and the knowledge sources are added to the knowledge source manager. XXX: MO: we probably just want to deal with the ks's here. The template creator KS will have to deal with getting its shape models on its own...

getKSManager

public KnowledgeSourceManager getKSManager()

getBlackboard

public Blackboard getBlackboard()

addBlackboardObserver

public void addBlackboardObserver(Observer o)

addSchedulerObserver

public void addSchedulerObserver(Observer o)

toString

public String toString()

Overrides:

toString in class Object