Java Doc for PropertyChangeMulticaster.java in  » Ajax » Laszlo-4.0.10 » EDU » oswego » cs » dl » util » concurrent » Java Source Code / Java DocumentationJava Source Code and Java Documentation

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Java Source Code / Java Documentation » Ajax » Laszlo 4.0.10 » EDU.oswego.cs.dl.util.concurrent 
Source Cross Reference  Class Diagram Java Document (Java Doc) 


java.lang.Object
   EDU.oswego.cs.dl.util.concurrent.PropertyChangeMulticaster

PropertyChangeMulticaster
public class PropertyChangeMulticaster implements Serializable(Code)
This class is interoperable with java.beans.PropertyChangeSupport, but relies on a streamlined copy-on-write scheme similar to that used in CopyOnWriteArrayList. This leads to much better performance in most event-intensive programs. It also adheres to clarified semantics of add and remove operations.

Sample usage.

 class Thing {
 protected Color myColor = Color.red; // an example property
 protected PropertyChangeMulticaster listeners =
 new PropertyChangeMulticaster(this);
 // registration methods, including:
 void addListener(PropertyChangeListener l) {
 // Use the `ifAbsent' version to avoid duplicate notifications
 listeners.addPropertyChangeListenerIfAbsent(l);
 }
 public synchronized Color getColor() { // accessor
 return myColor;
 }
 // internal synchronized state change method; returns old value
 protected synchronized Color assignColor(Color newColor) { 
 Color oldColor = myColor;
 myColor = newColor; 
 return oldColor;
 }
 public void setColor(Color newColor) {
 // atomically change state
 Color oldColor = assignColor(newColor);
 // broadcast change notification without holding synch lock
 listeners.firePropertyChange("color", oldColor, newColor);
 }
 }
 

[ Introduction to this package. ]



Field Summary
protected  HashMapchildren
     HashMap for managing listeners for specific properties.
protected transient  PropertyChangeListener[]listeners
     The array of listeners.
final protected  Objectsource
     The object to be provided as the "source" for any generated events.

Constructor Summary
public  PropertyChangeMulticaster(Object sourceBean)
     Constructs a PropertyChangeMulticaster object.

Method Summary
public synchronized  voidaddPropertyChangeListener(PropertyChangeListener listener)
     Add a VetoableChangeListener to the listener list.
public  voidaddPropertyChangeListener(String propertyName, PropertyChangeListener listener)
     Add a PropertyChangeListener for a specific property.
public synchronized  voidaddPropertyChangeListenerIfAbsent(PropertyChangeListener listener)
     Add a PropertyChangeListener to the listener list if it is not already present.
public  voidaddPropertyChangeListenerIfAbsent(String propertyName, PropertyChangeListener listener)
     Add a PropertyChangeListener for a specific property, if it is not already registered.
public  voidfirePropertyChange(String propertyName, Object oldValue, Object newValue)
     Report a bound property update to any registered listeners.
public  voidfirePropertyChange(String propertyName, int oldValue, int newValue)
     Report an int bound property update to any registered listeners.
public  voidfirePropertyChange(String propertyName, boolean oldValue, boolean newValue)
     Report a boolean bound property update to any registered listeners.
public  voidfirePropertyChange(PropertyChangeEvent evt)
     Fire an existing PropertyChangeEvent to any registered listeners.
protected synchronized  PropertyChangeMulticastergetChild(String propertyName)
    
public  booleanhasListeners(String propertyName)
     Check if there are any listeners for a specific property. If propertyName is null, return whether there are any listeners at all.
Parameters:
  propertyName - the property name.
protected  voidmulticast(PropertyChangeEvent evt)
     Helper method to relay evt to all listeners.
public synchronized  voidremovePropertyChangeListener(PropertyChangeListener listener)
     Remove a PropertyChangeListener from the listener list.
public  voidremovePropertyChangeListener(String propertyName, PropertyChangeListener listener)
     Remove a PropertyChangeListener for a specific property. Affects only the given property.

Field Detail
children
protected HashMap children(Code)
HashMap for managing listeners for specific properties. Maps property names to PropertyChangeMulticaster objects.



listeners
protected transient PropertyChangeListener[] listeners(Code)
The array of listeners. Copied on each update



source
final protected Object source(Code)
The object to be provided as the "source" for any generated events.




Constructor Detail
PropertyChangeMulticaster
public PropertyChangeMulticaster(Object sourceBean)(Code)
Constructs a PropertyChangeMulticaster object.
Parameters:
  sourceBean - The bean to be given as the source for any events.
exception:
  NullPointerException - if sourceBean is null




Method Detail
addPropertyChangeListener
public synchronized void addPropertyChangeListener(PropertyChangeListener listener)(Code)
Add a VetoableChangeListener to the listener list. The listener is registered for all properties. If the listener is added multiple times, it will receive multiple change notifications upon any firePropertyChange
Parameters:
  listener - The PropertyChangeListener to be added
exception:
  NullPointerException - If listener is null



addPropertyChangeListener
public void addPropertyChangeListener(String propertyName, PropertyChangeListener listener)(Code)
Add a PropertyChangeListener for a specific property. The listener will be invoked only when a call on firePropertyChange names that specific property. However, if a listener is registered both for all properties and a specific property, it will receive multiple notifications upon changes to that property.
Parameters:
  propertyName - The name of the property to listen on.
Parameters:
  listener - The PropertyChangeListener to be added
exception:
  NullPointerException - If listener is null



addPropertyChangeListenerIfAbsent
public synchronized void addPropertyChangeListenerIfAbsent(PropertyChangeListener listener)(Code)
Add a PropertyChangeListener to the listener list if it is not already present. The listener is registered for all properties. The operation maintains Set semantics: If the listener is already registered, the operation has no effect.
Parameters:
  listener - The PropertyChangeListener to be added
exception:
  NullPointerException - If listener is null



addPropertyChangeListenerIfAbsent
public void addPropertyChangeListenerIfAbsent(String propertyName, PropertyChangeListener listener)(Code)
Add a PropertyChangeListener for a specific property, if it is not already registered. The listener will be invoked only when a call on firePropertyChange names that specific property.
Parameters:
  propertyName - The name of the property to listen on.
Parameters:
  listener - The PropertyChangeListener to be added
exception:
  NullPointerException - If listener is null



firePropertyChange
public void firePropertyChange(String propertyName, Object oldValue, Object newValue)(Code)
Report a bound property update to any registered listeners. No event is fired if old and new are equal and non-null.
Parameters:
  propertyName - The programmatic name of the propertythat was changed.
Parameters:
  oldValue - The old value of the property.
Parameters:
  newValue - The new value of the property.



firePropertyChange
public void firePropertyChange(String propertyName, int oldValue, int newValue)(Code)
Report an int bound property update to any registered listeners. No event is fired if old and new are equal and non-null.

This is merely a convenience wrapper around the more general firePropertyChange method that takes Object values.
Parameters:
  propertyName - The programmatic name of the propertythat was changed.
Parameters:
  oldValue - The old value of the property.
Parameters:
  newValue - The new value of the property.




firePropertyChange
public void firePropertyChange(String propertyName, boolean oldValue, boolean newValue)(Code)
Report a boolean bound property update to any registered listeners. No event is fired if old and new are equal and non-null.

This is merely a convenience wrapper around the more general firePropertyChange method that takes Object values.
Parameters:
  propertyName - The programmatic name of the propertythat was changed.
Parameters:
  oldValue - The old value of the property.
Parameters:
  newValue - The new value of the property.




firePropertyChange
public void firePropertyChange(PropertyChangeEvent evt)(Code)
Fire an existing PropertyChangeEvent to any registered listeners. No event is fired if the given event's old and new values are equal and non-null.
Parameters:
  evt - The PropertyChangeEvent object.



getChild
protected synchronized PropertyChangeMulticaster getChild(String propertyName)(Code)
Return the child associated with property, or null if no such



hasListeners
public boolean hasListeners(String propertyName)(Code)
Check if there are any listeners for a specific property. If propertyName is null, return whether there are any listeners at all.
Parameters:
  propertyName - the property name. true if there are one or more listeners for the given property



multicast
protected void multicast(PropertyChangeEvent evt)(Code)
Helper method to relay evt to all listeners. Called by all public firePropertyChange methods.



removePropertyChangeListener
public synchronized void removePropertyChangeListener(PropertyChangeListener listener)(Code)
Remove a PropertyChangeListener from the listener list. It removes at most one occurrence of the given listener. If the listener was added multiple times it must be removed mulitple times. This removes a PropertyChangeListener that was registered for all properties, and has no effect if registered for only one or more specified properties.
Parameters:
  listener - The PropertyChangeListener to be removed



removePropertyChangeListener
public void removePropertyChangeListener(String propertyName, PropertyChangeListener listener)(Code)
Remove a PropertyChangeListener for a specific property. Affects only the given property. If the listener is also registered for all properties, then it will continue to be registered for them.
Parameters:
  propertyName - The name of the property that was listened on.
Parameters:
  listener - The PropertyChangeListener to be removed



Methods inherited from java.lang.Object
native protected Object clone() throws CloneNotSupportedException(Code)(Java Doc)
public boolean equals(Object obj)(Code)(Java Doc)
protected void finalize() throws Throwable(Code)(Java Doc)
final native public Class getClass()(Code)(Java Doc)
native public int hashCode()(Code)(Java Doc)
final native public void notify()(Code)(Java Doc)
final native public void notifyAll()(Code)(Java Doc)
public String toString()(Code)(Java Doc)
final native public void wait(long timeout) throws InterruptedException(Code)(Java Doc)
final public void wait(long timeout, int nanos) throws InterruptedException(Code)(Java Doc)
final public void wait() throws InterruptedException(Code)(Java Doc)

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