@Nonnull @Override public <R> StreamStage<R> rollingAggregate(@Nonnull AggregateOperation1<? super T, ?, ? extends R> aggrOp) { return groupingKey(constantKey()).rollingAggregate(aggrOp, (k, v) -> v); }
private static Pipeline buildPipeline() { Pipeline p = Pipeline.create(); p.drawFrom(Sources.<Entry<String, Integer>, Integer, Entry<String, Integer>>mapJournal(TRADES_MAP_NAME, DistributedPredicate.alwaysTrue(), EventJournalMapEvent::getNewValue, START_FROM_CURRENT)) .groupingKey(Entry::getKey) .rollingAggregate(summingLong(Entry::getValue)) .drainTo(Sinks.map(VOLUME_MAP_NAME)); return p; }
private static Pipeline buildPipeline() { Pipeline p = Pipeline.create(); p.drawFrom(Sources.<Trade, Integer, Trade>mapJournal(TRADES_MAP_NAME, DistributedPredicate.alwaysTrue(), EventJournalMapEvent::getNewValue, START_FROM_CURRENT)) .groupingKey(Trade::getTicker) .rollingAggregate(summingLong(Trade::getPrice)) .drainTo(Sinks.map(VOLUME_MAP_NAME)); return p; }