public boolean get() {
while (!stopped) {
long old = availables.getAndDecrement();
if (old > 0) return true;
try {
synchronized (this) {
this.wait();
}
} catch (InterruptedException e) {
return false;
}
}
return false;
}
/**
* Atomically subtracts from the size and count, if the queue is running in atomic counting mode,
* or sizeable mode and the element is sizeable.
*
* @param record The record to update the size and count for.
*/
private void decrementSizeAndCount(E record) {
// Update the count for atomically counted queues.
if (atomicallyCounted) {
count.decrementAndGet();
}
// Update the size for sizeable elements and sizeable queues.
if (sizeable && (record instanceof Sizeable)) {
long recordSize = -((Sizeable) record).sizeof();
long oldSize = dataSize.getAndAdd(recordSize);
long newSize = oldSize + recordSize;
signalOnSizeThresholdCrossing(oldSize, newSize);
} else if (sizeable) {
long oldSize = dataSize.getAndDecrement();
long newSize = oldSize - 1;
signalOnSizeThresholdCrossing(oldSize, newSize);
}
}
@Override
public void run() {
long requests = concurrentRequests.getAndDecrement();
if (deferredResult.isSetOrExpired()) {
logger.warn(
"{}: Processing of non-blocking request #{} already expired", requests, requestId);
} else {
logger.info("Retrieving result");
NetworkServiceInstantiateReply reply = ServiceSelectionMsgTable.getInstance().get(requestId);
if (reply != null) {
logger.info("Retrieving reply from orchestrator with ns id {}", requestId);
}
boolean deferredStatus = deferredResult.setResult(reply);
logger.debug(
"{}: Processing of non-blocking request #{} done, deferredStatus = {}",
requests,
requestId,
deferredStatus);
}
}
@Override
public T remove() {
Long id = currentId.getAndIncrement();
counter.getAndDecrement();
return objects.remove(id);
}
/** getAndDecrement returns previous value and decrements */
public void testGetAndDecrement() {
AtomicLong ai = new AtomicLong(1);
assertEquals(1, ai.getAndDecrement());
assertEquals(0, ai.getAndDecrement());
assertEquals(-1, ai.getAndDecrement());
}