How to use

isWaitingForRevocableMemory

method

in

com.facebook.presto.operator.OperatorContext

private Optional<ListenableFuture<?>> getBlockedFuture(Operator operator)
{
  ListenableFuture<?> blocked = revokingOperators.get(operator);
  if (blocked != null) {
    // We mark operator as blocked regardless of blocked.isDone(), because finishMemoryRevoke has not been called yet.
    return Optional.of(blocked);
  }
  blocked = operator.isBlocked();
  if (!blocked.isDone()) {
    return Optional.of(blocked);
  }
  blocked = operator.getOperatorContext().isWaitingForMemory();
  if (!blocked.isDone()) {
    return Optional.of(blocked);
  }
  blocked = operator.getOperatorContext().isWaitingForRevocableMemory();
  if (!blocked.isDone()) {
    return Optional.of(blocked);
  }
  return Optional.empty();
}

private Predicate<OperatorContext> waitingForRevocableSystemMemory()
{
  return (OperatorContext operatorContext) ->
      !operatorContext.isWaitingForRevocableMemory().isDone() &&
          !operatorContext.isMemoryRevokingRequested();
}