Out-of-the-box Reactive Streams with Java 9
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The document discusses out-of-the-box reactive streams in Java 9, detailing the roles of producers, subscribers, and processors within the reactive streams architecture. It includes examples demonstrating the use of reactive streams with Java components such as a number publisher and integration with Project Reactor and Akka Streams. The summary notes that while this is not a full implementation of reactive streams, it allows for interoperability and is part of the incubation phase for reactive stream support in the new HTTP client.
Out-of-the-box Reactive Streams with Java 9
- 1. OUT-OF-THE-BOX REACTIVE STREAMS WITH JAVA 9 JACEK KUNICKI @rucek https://github.com/rucek/reactive-streams-java9
- 2. @rucekOOTB REACTIVE STREAMS WITH JAVA 9 STREAM PROCESSING PRODUCER CONSUMERPROCESSING STAGE 1 PROCESSING STAGE N DATA SubscriberPublisher BACKPRESSURE request(n) Processor Processor
- 4. @rucek j.u.c.Flow.Publisher<T> ▸ produces items of type T that subscribers are going to consume ▸ multiple subscribers receive items in the same order ▸ subscribers register via subscribe(Subscriber<? super T>) OOTB REACTIVE STREAMS WITH JAVA 9
- 5. @rucek j.u.c.Flow.Subscriber<T> ▸ subscribes to a producer in order to receive: ▸ subscription confirmation via onSubscribe(Subscription) ▸ items via onNext(T) ▸ errors via onError(Throwable) ▸ completion signal via onComplete() OOTB REACTIVE STREAMS WITH JAVA 9
- 6. @rucek j.u.c.Flow.Subscription ▸ connects a single producer to a single subscriber, allows to: ▸ backpressure with request(long) ▸ signal (eventual) termination with cancel() OOTB REACTIVE STREAMS WITH JAVA 9
- 7. @rucek j.u.c.Flow.Processor<T, R> ▸ a combination of a Subscriber<T> and a Publisher<R> OOTB REACTIVE STREAMS WITH JAVA 9
- 8. @rucek j.u.c.SubmissionPublisher<T> ▸ the only concrete implementation available so far ▸ asynchronously issues submitted (non-null) items to current subscribers ▸ can be used as a base for your own components OOTB REACTIVE STREAMS WITH JAVA 9
- 10. @rucekOOTB REACTIVE STREAMS WITH JAVA 9
- 11. @rucek DEMO 1 - PURE JAVA 9 ▸ number publisher based on an IntStream ▸ filtering and mapping processors based on the SubmissionPublisher ▸ a subscriber that prints to System.out OOTB REACTIVE STREAMS WITH JAVA 9
- 12. @rucek DEMO 2 - INTEGRATION ▸ Project Reactor’s Flux as a publisher ▸ Akka Streams Flow as a processor ▸ a pure Java 9 processor ▸ a pure Java 9 subscriber OOTB REACTIVE STREAMS WITH JAVA 9
- 13. @rucek SUMMARY ▸ not a full Reactive Streams implementation ▸ allows for interoperability between other implementations ▸ incubating Reactive Streams support in the new HTTP client OOTB REACTIVE STREAMS WITH JAVA 9
- 14. @rucek THANK YOU! @rucek OOTB REACTIVE STREAMS WITH JAVA 9 https://github.com/rucek/reactive-streams-java9