public void run() {
try {
for (; ; ) {
try {
final Pair<Handler, Message> entry = eventQueue.take();
final Handler handler = entry.left;
final Message message = entry.right;
final Object result = message.accept(handler);
if (message instanceof Command) {
responseMap.put((Command) message, result);
} else {
// Broadcast the event to anyone who is interested.
RolapUtil.MONITOR_LOGGER.debug(message);
}
if (message instanceof ShutdownCommand) {
LOGGER.debug("ShutdownCommand received. Monitor thread is shutting down.");
return;
}
} catch (InterruptedException e) {
Thread.currentThread().interrupt();
LOGGER.warn("Monitor thread interrupted.", e);
return;
} catch (Throwable t) {
LOGGER.error("Runtime error on the monitor thread.", t);
}
}
} finally {
running = false;
}
}
Object execute(Handler handler, Command command) {
try {
eventQueue.put(Pair.<Handler, Message>of(handler, command));
} catch (InterruptedException e) {
throw Util.newError(e, "Interrupted while sending " + command);
}
try {
return responseMap.get(command);
} catch (InterruptedException e) {
throw Util.newError(e, "Interrupted while awaiting " + command);
}
}