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The new SwingWorker supports timeouts by overriding that the getTimeout () method has returned a non-zero value. When the timeout is exceeded, the worker thread is interrupted.

If you want to see examples of using timeouts, see the annotated version of the getTimeout () method and how DynamicTree handles TimeoutException.

The timeout function is implemented in TimedCallable, where the timedGet () method of FutureResult is used.

Enhanced exception handling

Anything thrown by the construct () method is recorded. In addition to deadloops and deadlocks, the new exception handling ensures that SwingWorker is in a "ready" state. That is, it either gets a correct result or an exception.

The following get () method is used to fetch the result. This method inherits from FutureResult:

◆ publicObjectget ()

◆ throwsInvocationTargetException,InterruptedException

If construct () throws an Exception,get () method, it throws InvocationTargetException. To get the exception actually thrown by the construct () method, you can call getTargetException () for exception handling.

The get () method throws an InterruptedException-- if the thread fetching the result is interrupted while waiting for the result, but this is rare for SwingWorker because the thread taking the result is usually an event dispatch thread, and the result is always ready before finished () is called.

More invocation tools

The implementation of SwingWorker is in the jozart.swingutils package. You can also find the InvokeUtils class in the same package, which also provides several invokeXXX () methods. The background thread can use these methods to get values and user input in the event dispatch thread, and then return the results to the background thread.

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