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Java Source Code / Java Documentation » IDE » DrJava » edu.rice.cs.util.swing 
Source Cross Reference  Class Diagram Java Document (Java Doc) 


java.lang.Object
   edu.rice.cs.util.swing.AsyncTask

AsyncTask
abstract public class AsyncTask (Code)
The AsyncTask base class is a framework that facilitates execution of operations asynchronously in order to free up the event-handling thread. This task is passed to an implementation of the AsyncTaskLauncher to be run.

Any code that should be performed in asynchronously with the UI should be put in the runAsync method. Any code that is run in this method should NOT modify any Swing components at all. All modifications to Swing components must either be enqueued on the event-handling thread or performed in the complete method. If there is any data that must be passed from the asynchronous step to the completion step, it should be returned by the runAsync method. The same data returned by the runAsync method will be given to the complete method. In short, implementations of an AsyncTask need not manage the information passing between the task thread and the UI thread.

The runAsync method is given a progress monitor in order for the task to provide feedback to the user as to the progress of the task. The min and max values for the progress are specified by the getMinProgress and getMaxProgress methods in the task.
author:
   jlugo




Constructor Summary
public  AsyncTask()
    
public  AsyncTask(String name)
    

Method Summary
abstract public  voidcomplete(AsyncCompletionArgs<ResType> args)
     This is the completion step where any modifications to swing components should be made.
abstract public  StringgetDiscriptionMessage()
     Sets the description of the task that should be displayed in the progress monitor that the user sees.
public  intgetMaxProgress()
    
public  intgetMinProgress()
    
public  StringgetName()
     Returns the name of this specific type of task.
abstract public  ResTyperunAsync(ParamType param, IAsyncProgress monitor)
     This is the method of the task that is run on the separate thread.
public  StringtoString()
    


Constructor Detail
AsyncTask
public AsyncTask()(Code)
Default Constructor



AsyncTask
public AsyncTask(String name)(Code)
Creates a task that has the given name
Parameters:
  name - The name of the task.




Method Detail
complete
abstract public void complete(AsyncCompletionArgs<ResType> args)(Code)
This is the completion step where any modifications to swing components should be made. This method is called on the AWT event thread and so any changes made to swing components are safe.



getDiscriptionMessage
abstract public String getDiscriptionMessage()(Code)
Sets the description of the task that should be displayed in the progress monitor that the user sees. While the task is in progress, a separate note can be set in order to display specific information about the progress of the task. This can be set by calling ProgressMonitor.setNote A brief description of the task being performed



getMaxProgress
public int getMaxProgress()(Code)
Reutrns the minimum value of the progress monitor The minimum value (100.0%) of the progress monitor



getMinProgress
public int getMinProgress()(Code)
Returns the minimum value of the progress monitor The minimum value (0.0%) of the progress monitor



getName
public String getName()(Code)
Returns the name of this specific type of task. If this is not overridden the name of the task



runAsync
abstract public ResType runAsync(ParamType param, IAsyncProgress monitor) throws Exception(Code)
This is the method of the task that is run on the separate thread. Any implementation of this method should not make any changes to GUI components unless those calls are made explicitly thread safe by the developer. Any code that modifies swing GUI components in any way should be located in the complete method.
Parameters:
  param - Any parameter that should be passed to the task when it isexecuted
Parameters:
  monitor - An object that handles the flow of information about the progressof the task both to and from the runAsync method. This also offersa means of passing a result from the async step to the completionstep.
throws:
  Exception -



toString
public String toString()(Code)



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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