org.jhotdraw.gui
Class Worker

java.lang.Object
  org.jhotdraw.gui.Worker

All Implemented Interfaces:

java.lang.Runnable

public abstract class Worker
extends java.lang.Object
implements java.lang.Runnable

This is an abstract class that you subclass to perform GUI-related work in a dedicated event dispatcher.

This class is similar to SwingWorker but less complex. Like a SwingWorker it can run using an an internal worker thread but it can also be like a Runnable object.

Version:

2.1 2005-10-16 Method start() added.
2.0 2005-09-27 Revised.
1.1.1 2001-08-24 Call finished() within finally block.
1.1 2001-08-24 Reworked for JDK 1.3.
1.0 1998-10-07 Created.

Author:

Werner Randelshofer

Constructor Summary

Worker()

Method Summary

abstract java.lang.Object	construct() Compute the value to be returned by the get method.
abstract void	finished(java.lang.Object value) Called on the event dispatching thread (not on the worker thread) after the construct method has returned.
protected java.lang.Object	getValue() Get the value produced by the worker thread, or null if it hasn't been constructed yet.
void	run() Calls #construct on the current thread and invokes #finished on the AWT event dispatcher thread.
void	start() Starts the Worker on an internal worker thread.

Methods inherited from class java.lang.Object

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

Constructor Detail

Worker

public Worker()

Method Detail

run

public final void run()

Calls #construct on the current thread and invokes #finished on the AWT event dispatcher thread.

Specified by:

run in interface java.lang.Runnable

construct

public abstract java.lang.Object construct()

Compute the value to be returned by the get method.

finished

public abstract void finished(java.lang.Object value)

Called on the event dispatching thread (not on the worker thread) after the construct method has returned.

Parameters:

value - The return value of the construct method.

getValue

protected java.lang.Object getValue()

Get the value produced by the worker thread, or null if it hasn't been constructed yet.

start

public void start()

Starts the Worker on an internal worker thread.