/** {@inheritDoc} */
@Override
public void run() {
while (requests != null) {
/* Not processing a request. */
currentRequest = null;
/* Take a new request from the queue, waiting for one if none is available yet. */
try {
currentRequest = requests.take();
}
/* Interrupted? Well, try again! */
catch (InterruptedException ignored) {
continue;
}
/* Process the request. */
try {
ui.process(currentRequest.getRequest());
}
/* Uncaught exception occurred during the request. */
catch (Throwable e) {
e.initCause(currentRequest.getCause());
logger.err(e, "Unexpected error occurred.");
}
}
}
/**
* Add a request to the stack of requests to execute in the update thread.
*
* @param uiRequest The request to execute in the update thread.
*/
public void request(Request uiRequest) {
UpdateRequest newRequest =
new UpdateRequest(
uiRequest,
new RuntimeException(
Locale.explain("err.originates")
+ Thread.currentThread().getName())); // $NON-NLS-1$
/* Don't process a request if the next pending or currently executing request is the same. */
if (newRequest.equals(currentRequest) || requests.contains(newRequest)) return;
/* Add this request to the request list. */
synchronized (requests) {
try {
if (!requests.offer(newRequest, 500, TimeUnit.MILLISECONDS))
throw new InterruptedException("Maximum wait time elapsed.");
} catch (InterruptedException e) {
logger.err(e, "err.updateQueueFull", newRequest);
}
}
}