Examples with QueueReader com.oath.cyclops.async.adapters.Queue.QueueReader used on opensource projects

Example 1 with QueueReader

use of com.oath.cyclops.async.adapters.Queue.QueueReader in project cyclops by aol.

the class EagerFutureStreamFunctions method firstOf.

/**
 * Return first Stream out of provided Streams that starts emitted results
 *
 * @param futureStreams Streams to race
 * @return First Stream to skip emitting values
 */
@SafeVarargs
public static <U> SimpleReactStream<U> firstOf(final SimpleReactStream<U>... futureStreams) {
    final List<Tuple2<SimpleReactStream<U>, QueueReader>> racers = Stream.of(futureStreams).map(s -> Tuple.tuple(s, new Queue.QueueReader(s.toQueue(), null))).collect(Collectors.toList());
    while (true) {
        for (final Tuple2<SimpleReactStream<U>, Queue.QueueReader> q : racers) {
            if (q._2().notEmpty()) {
                EagerFutureStreamFunctions.closeOthers(q._2().getQueue(), racers.stream().map(t -> t._2().getQueue()).collect(Collectors.toList()));
                closeOthers(q._1(), racers.stream().map(t -> t._1()).collect(Collectors.toList()));
                return q._1().fromStream(q._2().getQueue().stream(q._1().getSubscription()));
            }
        }
        LockSupport.parkNanos(1l);
    }
}