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For More Information Download the Image Search demo source code. Accessing your UI components or their event handlers from other threads will cause update and drawing errors in the UI.

You should not call this method directly because the SwingWorker superclass will do it for you.

0, and developer B creates an equally mission-critical application with Java SE 6, with the new monitoring features embedded. If the user makes a cancellation request or initiates a new search after the check in retrieveAndProcessThumbnails but before the model update, the thumbnail will still appear in the visual list. At one end of the spectrum, you provide all the JavaScript code required to enable Ajax in the page.

Suppose that developer A creates a mission-critical application on J2SE 5.

The Overlay Maker provides a simple networked interface for collaborative planning (real-time drawing updates for all in the network). Let me take a peek inside the stack through the JConsole.

The class type parameters say that the ImageSearcher's doInBackground and get methods will return a list of ImageInfo objects when the thread finishes. Performing long-running tasks on the EDT will cause your application to become unresponsive because GUI events will accumulate in the event dispatch queue.

Notice that the retrieveImage method adds a property change listener to the ImageRetriever instance before executing the thread.

Instead of executing the tasks on the EDT, the application uses the SwingWorker class to perform the tasks as worker threads.

He also provides technical direction to global services sales and delivery. The retrieveImage method and its EDT no longer need access to the worker thread. This method loops through a list of image data and retrieves those thumbnail images.

This is a good place to call the get method because you know that the thread's work is finished when this method executes. The ImageSearcher class is responsible for searching and retrieving thumbnail images for the UI's list. Subscribe to Core Java Technologies Tech Tips.

For example, enterprise application developers need to add logic in server-side components to handle Ajax-related requests directed to the server.

The application may have been written by a third-party company, an integration company, or an internal IT department. Using a Simple ImageRetriever Now that you've created a simple SwingWorker implementation such as the ImageRetriever subclass, how do you use it? The infoList object is the same type as specified earlier in the class and method declarations.

Finding problematic code may not always be simple, but the Java Platform, Standard Edition 6 (Java SE 6) makes it easier to fix such code by providing the javax.

If you use inner classes, you might not even provide this information in the constructor, because the worker thread will be able to access the information directly.

Voir aussi : Service de la population, www.

If an application fails even briefly, it could cost millions of dollars or, in a medical emergency, lives.

The JavaScript function also specifies a JavaScript callback function. He joined Sun in 1992 as a Solaris Operating System engineer and helped develop widely adopted products such as JumpStart, Solstice, and SunSolve. With a relatively quiet year for me in 2006, I took JImagePaint and bits of a few other unrelated projects off the shelf a couple of months ago and started hacking in the evenings.

Once the GUI starts for most event-driven desktop applications, the initial thread's work is done. The MainFrame class contains a progress bar that tracks the status of the image download.

We've got it up and running, but it's only a temporary work-around. Once the GUI starts for most event-driven desktop applications, the initial thread's work is done.

Override the process method to work with intermediate results. To begin, the nifty splash screen makes the application look more polished at startup. Also, the class will publish individual ImageInfo objects as it processes them, making them immediately viewable as they become available. A common question is "Do I foresee such a situation?