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SwingWorker is designed for situations where you need to have a long running task run in a background thread and provide updates to the UI either when done, or while processing. Subclasses of SwingWorker must implement the doInBackground method to perform the background computation. Workflow There are three threads involved in the life cycle of a SwingWorker : Current thread: The execute method is called on this thread.

It schedules SwingWorker for the execution on a worker thread and returns immediately. One can wait for the SwingWorker to complete using the get methods. Worker thread: The doInBackground method is called on this thread.

This is where all background activities should happen. By default there are two bound properties available: state and progress. Event Dispatch Thread : All Swing related activities occur on this thread. SwingWorker invokes the process and done methods and notifies any PropertyChangeListeners on this thread.

Often, the Current thread is the Event Dispatch Thread. After the doInBackground method is finished the done method is executed.

SwingWorker is only designed to be executed once. Executing a SwingWorker more than once will not result in invoking the doInBackground method twice. Sample Usage The following example illustrates the simplest use case. Some processing is done in the background and when done you update a Swing component.

Say we want to find the “Meaning of Life” and display the result in a JLabel. Now we want to find the first N prime numbers and display the results in a JTextArea.

While this is computing, we want to update our progress in a JProgressBar. Finally, we also want to print the prime numbers to System. Since: 1. StateValue Values for the state bound property. T get Waits if necessary for the computation to complete, and then retrieves its result.

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SwingWorker provides a number of communication and control features: The SwingWorker subclass can define a method, done , which is automatically invoked on the event dispatch thread when the background task is finished. SwingWorker implements java. This interface allows the background task to provide a return value to the other thread. Other methods in this interface allow cancellation of the background task and discovering whether the background task has finished or been cancelled.

Can you post either your current attempt at a simple compilable and runnable version of what you’re trying to do complete with your attempt to use a SwingWorker, best as an sscce if possible?

Either that or go into significant detail on exactly where you’re stuck, since all I’m getting from the above is that you’re completely stuck on everything.

If that’s the case, then you’ll need to re-review the tutorials. But either way, please let us know! Other links to examples mine! You may want to adapt one of his or my cited examples to construct your sscce.

I’ll try to update the code with my attempt at a swing worker. If the class is say, somewhere in the order of ish lines of code, do you still want it? Show 6 more comments. Sorted by: Reset to default. Highest score default Trending recent votes count more Date modified newest first Date created oldest first. Improve this answer.

 
 

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Worker thread: The doInBackground method is called on this thread. This is where all background activities should happen.

By default there are two bound properties available: state and progress. Event Dispatch Thread : All Swing related activities occur on this thread. SwingWorker invokes the process and done methods and notifies any PropertyChangeListeners on this thread. Often, the Current thread is the Event Dispatch Thread. After the doInBackground method is finished the done method is executed. SwingWorker is only designed to be executed once. Executing a SwingWorker more than once will not result in invoking the doInBackground method twice.

Sample Usage The following example illustrates the simplest use case. Some processing is done in the background and when done you update a Swing component. Say we want to find the “Meaning of Life” and display the result in a JLabel. Now we want to find the first N prime numbers and display the results in a JTextArea. While this is computing, we want to update our progress in a JProgressBar. Finally, we also want to print the prime numbers to System.

Since: 1. StateValue Values for the state bound property. T get Waits if necessary for the computation to complete, and then retrieves its result. T get long timeout, TimeUnit unit Waits if necessary for at most the given time for the computation to complete, and then retrieves its result, if available.

Methods inherited from class java. Note that this method is executed only once. Note: this method is executed in a background thread. Returns: the computed result Throws: Exception – if unable to compute a result run public final void run Sets this Future to the result of computation unless it has been cancelled. SwingWorker is a completely new class. Its functionality is not a strict superset of the old SwingWorker.

Methods in the two classes that have the same function do not have the same names. Also, instances of the old SwingWorker class were reusable, while a new instance of javax. SwingWorker is needed for each new background task. Throughout the Java Tutorials, any mention of SwingWorker now refers to javax. Community Bot 1 1 1 silver badge. Add a comment.

Sign up or log in Sign up using Google. Sign up using Facebook. Sign up using Email and Password. Post as a guest Name. Email Required, but never shown. Not the answer you’re looking for? Browse other questions tagged java multithreading swing swingworker jprogressbar or ask your own question. The Overflow Blog. Remote work is killing big offices. Cities must change to survive. SwingWorker enables proper use of the event dispatching thread.

Several incompatible, unofficial, versions of SwingWorker were produced from to , and care must be taken to avoid the abundant documentation on these versions predating Java 6.

SwingWorker is useful when a time-consuming task has to be performed following a user-interaction event for example, parsing a huge XML File, on pressing a JButton. The most straightforward way to do it is :. This will work, but unfortunately, the loadXML method will be called in the same thread as the main Swing thread the Event dispatching thread , so if the method needs time to perform, the GUI will freeze during this time.

This problem is not specific to Java, but common to many GUI models. SwingWorker proposes a way to solve it by performing the time-consuming task on another background thread, keeping the GUI responsive during this time. Execution is started by using the SwingWorker. The result can be retrieved by using the SwingWorker.

As calling get on the Event Dispatch Thread blocks all events, including repaints, from being processed until the task completes, one must avoid calling it before the lengthy operation has finished.

 

Swingworker download.Worker Threads and SwingWorker

 

Swingworker download writing a multi-threaded application using Swing, there are two constraints to downloa in mind: refer to How swingworkerr Use Threads for more details : Time-consuming tasks should not be http://replace.me/3262.txt swingworker download the Event Dispatch Thread. Otherwise the application becomes downlod.

Swing components should swingworker download accessed on the Event Dispatch Thread only. This involves inter-thread communication which can be tricky to implement. SwingWorker is designed for situations where you swingworker download to have a long running task run in a background thread and provide updates to the UI either when done, or while processing. Subclasses of SwingWorker must implement the doInBackground method to perform swingowrker background computation. Swingworoer There are three threads involved in the downlpad cycle of a SwingWorker : Current thread: The execute method is called on this thread.

It schedules SwingWorker for the execution on a worker thread and returns immediately. One can wait for the SwingWorker awingworker complete using the get посетить страницу источник. Worker thread: The doInBackground method is called on ссылка thread.

This is where all background activities should happen. By default there are two bound properties available: state and progress. Event Dispatch Thread : All Swing related activities occur on this thread.

SwingWorker invokes the process and done methods and notifies any PropertyChangeListeners on this thread. Often, the Current thread is the Event Dispatch Thread. After the doInBackground method is finished the done method is executed. SwingWorker is only designed to be executed once. Executing a SwingWorker more than once swungworker not result in invoking the doInBackground method twice. Sample Usage The following example illustrates the simplest use case.

Some processing is done in the background and when done you update a Swing component. Say we want to find the “Meaning of Life” and display the result in a JLabel.

Now we swingworker download to find the first N prime numbers and display the results in a JTextArea. While this is computing, we want to update our progress in a JProgressBar.

Finally, we also want to print the prime numbers to System. Since: 1. StateValue Values for the state bound property. T get Waits if necessary for the computation to complete, and then retrieves its result.

T get long timeout, TimeUnit unit Waits if necessary for at most the given time for the computation diwnload complete, and then retrieves its result, if available. Methods inherited from class java. Note that this method is executed only once. Note: swingworker download method is executed in a background thread. Returns: the computed result Throws: Exception – if unable to compute a result run public final void run Sets this Future to the result of computation unless swingworker download has been cancelled.

This method is to be used from inside the doInBackground method to deliver intermediate results for processing on the Event Dispatch Thread inside the process method.

Because the process method is invoked asynchronously on the Event Dispatch Thread multiple invocations to the publish method might occur before the process method is executed. For performance purposes all these invocations are coalesced into one invocation with concatenated arguments. For example: publish “1” ; publish “2”, “3” ; publish “4”, “5”, “6” ; might result in: process “1”, “2”, “3”, “4”, “5”, “6” Sample Usage.

This code snippet loads some tabular data and updates DefaultTableModel with it. Note that it safe to mutate the tableModel from inside the process method because it is invoked on the Event Dispatch Thread. Please refer to the publish V Parameters: chunks – intermediate results swingwodker process See Also: publish V The default implementation does nothing. Subclasses may override this method to perform completion actions on the Event Dispatch Thread.

Note that you can query status inside the implementation of this method to determine the result of this task or whether this task has been swingworker download. See Also: doInBackgroundisCancelledget setProgress protected final void setProgress int progress Sets the progress bound property. The value should be from 0 to Because PropertyChangeListener s are notified asynchronously on the Event Dispatch Thread multiple invocations to the swingworker download method might occur before any PropertyChangeListeners are swingworker download.

For performance purposes all these invocations are swingworker download into one invocation with the last invocation argument only. For example, the following invokations: setProgress 1 ; setProgress 2 ; setProgress 3 ; might result in a single Swingworker download notification with the value 3. Parameters: progress – the progress value to set Throws: IllegalArgumentException – is value not from 0 to getProgress public final int getProgress Returns the progress bound property.

Returns: the progress bound property. There are a number of worker threads available. Swingworker download the event all worker threads swingworker download busy handling other SwingWorkers this Swingworker download is placed in a waiting queue. Note: SwingWorker is only designed to be executed once. This attempt will fail if the task has already completed, has already been cancelled, or could not be cancelled for some other reason.

If swingworker download, and this task has not started when cancel is called, this task should never run. If the task has already started, then the mayInterruptIfRunning parameter determines whether the thread executing this task should be interrupted in an attempt to stop the task. After this http://replace.me/22338.txt returns, subsequent calls to Future. Subsequent calls to Future.

Completion may be due to normal termination, an exception, or cancellation — in all of these cases, this method will return true. Note: calling get on the Event Dispatch Thread swingworker download all events, swingworker download repaints, from being swingworker download until this SwingWorker swingworker download complete. When you swingworker download the SwingWorker to block on the Event Dispatch Thread we recommend that you use a modal dialog.

Please refer to get for more details. The listener is registered for all properties. The same listener object may be added more than once, and will be called as many times as it swingworker download added. If listener is nullno exception is thrown and no action swingworker download taken. Note: This is merely a convenience wrapper. This swingworker download a PropertyChangeListener that was registered for swingworker download properties. If listener was added more than once to the same event source, it will be notified one less swingworker download after being removed.

If listener is nullor was never swingworker download, no exception is thrown and no action is taken. No event is fired if old and new are equal and non-null. This SwingWorker will be the source for any generated events.

This method is used when flexible access to bound properties swingworker download is needed. That documentation contains more detailed, developer-targeted descriptions, with conceptual overviews, definitions of terms, workarounds, and working code examples.

All rights reserved. Use is subject to license terms. Also swintworker the documentation redistribution policy. Object javax. Several background threads can be used to execute such tasks. However, the exact strategy of choosing a thread for any particular SwingWorker is unspecified and swingworker download not be relied on.

Schedules this SwingWorker for execution on a worker thread. Waits if necessary for the computation to complete, and then retrieves its result. Waits if necessary for at most the given time for the computation to complete, and then swingworker download its result, if available. Receives data chunks from the publish method asynchronously on the Event Dispatch Thread.

Sends data chunks to the process java. Sets this Future swingworker download the result of computation unless it has been cancelled. Computes a free java download 10, or throws an exception if unable to do so. Sets the progress bound property. Attempts to cancel execution of this task.

Returns true if this task completed. Adds a Swingworker download to the listener list. Removes a Swingworker download from the dodnload list.

Odwnload swingworker download bound property update to any registered listeners. SwingWorker Constructs this SwingWorker.