Project Reactor Now and Tomorrow

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© Copyright 2017 Pivotal Software, Inc. All rights Reserved. Version 1.0
Stéphane MALDINI
Simon BASLÉ
Project Reactor
Now ...

Stéphane Maldini
Senior Product Manager
& Lead Engineer
Project Reactor, Pivotal
&
@smaldini
Simon Baslé
@simonbasle
Staff...

Now
3.0
→
3.1

Is this a big deal ?
Spoiler: yes

Reactor 3.0
Versioning scheme: ERA.MAJOR.MINOR
Production ready, but had to be out before Spring Framework 5
Still room fo...

Project ____
Downloads :
> 300k/month
projectreactor.io :
> 30k unique/month
Gitter.im : #7 Java channel

Project ____
452 Closed Pull Requests
487 Closed Issues
11 Releases
53 Contributors
4 (+2) Core Committers

Shoutout to our Contributors

Why users want Reactor ?

Why users want Reactor ?
Reactive Streams
sample extract
reactive-streams.org

Why users want Reactor ?
Flux.range(from, count)

Do you speak
Reactive Streams ?

Reactor and Reactive Streams

Publisher<T>
&
Subscriber<T>

Publisher<Music>

Subscriber<Music>

Publisher<T>
void subscribe(Subscriber<T>)

Subscriber<T>
void onNext(T)
void onComplete()
void onError(Throwable)

Subscription [Music]

Subscription
void request(long)
void cancel()

Subscriber<T>
void onSubscribe(Subscription)
void onNext(T)
void onComplete()
void onError(Throwable)

This is
Flow Control

Flux
0-N elements
“classic” Publisher

Mono
0-1 elements
“specialized” Publisher

String res;
for(int i = 1; i <= 1000; i++) {
res = blockingHttpGet(“/quote/”+i);
handleBody(res);
}
Without --------

String res;
for(int i = 1; i <= 1000; i++) {
res = blockingHttpGet(“/quote/”+i);
handleBody(res);
}
1000 calls later...
Ma...

Flux.range(1, 1000)
.flatMap(i -> reactiveHttpCall("/quote/"+i))
.subscribe(this::handleBody);
With --------

Flux.range(1, 1000)
.flatMap(i -> reactiveHttpCall("/quote/"+i))
.subscribe(this::handleBody);
operator
With --------

Flux.range(1, 1000)
.flatMap(i -> reactiveHttpCall("/quote/"+i))
.subscribe(this::handleBody);
1 call later
Main Thread
Wi...

Flux.range(1, 1000)
.flatMap(i -> reactiveHttpCall("/quote/"+i))
.subscribe(this::handleBody);
256 http calls
With --------

Flux.range(1, 1000)
.flatMap(i -> reactiveHttpCall("/quote/"+i), 1)
.subscribe(this::handleBody);
With --------
1 http call

Flux.range(1, 1000)
.flatMap(i -> reactiveHttpCall("/quote/"+i), 1)
.subscribe(this::handleBody);
With --------
J-j-jeez R...

At every stage,
Flux and Mono are
Publisher

interface SomeReactiveApi {
Flux<T> findUsersLike(Publisher<String> usernames)
}
//...
someReactiveApi.findUsersLike(Mono....

interface SomeReactiveApi {
Flux<T> findUsersLike(Publisher<String> usernames)
}
//...
someReactiveApi.findUsersLike(Mono....

interface SomeReactiveApi {
Flux<T> findUsersLike(Publisher<String> usernames)
}
//...
someReactiveApi.findUsersLike(Mono....

Reactor Core
3.1
Hot from the oven

3.0
→
LTS 3.1

3.1 is a polished
programming
experience

Flux Mono
Aligning APIs between Flux and Mono

Flux Mono
flatmap then

Flux Mono
flatmap then

Flux Mono
flatmap flatmap

Practicalstatic
extensions
Initial N
ullability
support

“Reactor has matured,
laying out the foundations
for frameworks and users
to integrate their context
into the Core .”
Ente...

Cross-Cutting Concerns

Scannable
Visit the hierarchy of operators
Scan at each step for Attributes...
… either upstream (parents()) or downstream...

Tagging and Naming
give a chain of
operator a name
give a chain of
operator attributes

Tagging and Naming
Flux.range(1, 10)
.name("myRange")
.tag("createdBy", "rick");

Hooks
On last operator
instantiation before
subscribe
On every operator
instantiation

Hooks.onLastOperator(
Operators.lift(scannable ->
scannable.tags()
.anyMatch(t -> t.getT1()
.contains("createdBy")),
(scan...

Hooks.onLastOperator(
Operators.lift(scannable ->
scannable.tags()
.anyMatch(t -> t.getT1()
.contains("createdBy")),
(scan...

Possible Application: Metrics
E.g. tag a Flux with “METRICS” and a framework
could pick that up and add an operator that
i...

Improved Testing Support

reactor-test
StepVerifier to assert expectations on any
Publisher
TestPublisher to simulate a reactive source
PublisherPro...

StepVerifier
StepVerifier.withVirtualTime(
() -> Flux.interval(Duration.ofSeconds(45)).take(2))
.thenAwait(Duration.ofSeco...

TestPublisher
TestPublisher.create()
.next(1, 2, 3, 4)
.complete();
TestPublisher.createNonCompliant(Violation.ALLOW_NULLS...

PublisherProbe probe =
PublisherProbe.of(Flux.range(1, 10));
reactiveConditionalPath(Mono.just(1), probe.flux())
.subscrib...

The Context

Immutable
Context a = Context.of(“key”, “value”);
Context b = a.put(“key”, “value2”);
a.get(“key”); // ⇒ “value”
b.get(“ke...

Propagates during Subscription
[a=2,b=2]
[a=1,b=2]
[]
ctx.put(b,2)
[a=1]
ctx.put(a,1)
)subscribe( Subscriber
Subscribe
& C...

See Reference Guide for Snippets like this:
String key = "message";
Mono<String> r = Mono.just("Hello")
.subscriberContext...

More about Bismuth Release
https://spring.io/blog/2017/09/28/reactor-bismuth-is-out
Executive summary of latest 3.1 additi...

What’s new in The Ecosystem ?
In-house or community grown initiatives

reactor-netty

Reactor Netty only turns Netty into a
Reactive Streams ready bridge

Just a few threads for
a production-ready
volume of connections
with various latencies
writeread
select
worker worker work...

Non Blocking TCP, UDP and HTTP
Decouples Read and Write
Pauses reading on local Backpressure
Pauses local producing on Bac...

Webflux
WebClient
Cloud Gateway
Boot 2.0
Used and Distributed
by Spring

Vendor warning

Reactor Netty 0.7 API

Reactor Netty 0.7 API

Seriously, it’s 0.7.2.
It runs well.
But we’re polishing API before 0.8.0.M1
Best to use--------

reactor-kafka

Publish & Consume messages from Kafka...
… with a backpressure-ready Reactive API
https://github.com/reactor/reactor-kafka...

Reactor-Kafka
KafkaSender.create()
.send(Flux.range(1, 10)
.map(i ->
SenderRecord.create(topic, partition,
timestamp, i, "...

reactor-rabbitmq

Reactor-RabbitMQ
Publish & Consume messages from RabbitMQ...
… with a backpressure-ready Reactive API
https://github.com/r...

Reactor-RabbitMQ
Flux<Delivery> inboundFlux =
ReactorRabbitMq.receiver(receiverOptions)
.consumeNoAck("reactive.queue")
.s...

reactor-addons

Reactor-Addons
Extend Reactor Core API
Adapt Reactor to different execution contracts
https://github.com/reactor/reactor-a...

Retry Support
Factory methods that provide a fluent API to incrementally configure a Function
suitable for Flux.retryWhen....

Retry Support
flux.retryWhen(allBut(BusinessException.class)
.retryMax(3)
.exponentialBackoff(Duration.ofMillis(100),
Dura...

Math
Take a Flux<Number> and apply operations to its whole set
of elements using MathFlux static methods.
Mono<Long> sum =...

Math (with kotlin)
Mono<Long> sum = Flux.range(1, 10)
.sumLong();

An opinionated abstraction that helps you store and lookup a
Mono or a Flux to/from a cache.
CacheMono will store the Mono...

Mono<Integer> test =
CacheMono.lookup(reader(data), "foo")
.onCacheMissResume(() -> Mono.just(1L))
.andWriteWith(writer(da...

Community Highlights

Spring Ecosystem
#1 user and source of feedback

Reactive talk with

reactive-gRPC
https://github.com/salesforce/reactive-grpc
Integrates reactive programming with grpc-java
From --

Lettuce
http://lettuce.io
A Reactor-based reactive driver for Redis

Tech.io
https://tech.io/playgrounds/929/reactive-programming-with-reactor-3
A community-driven programming learning platfo...

CloudFoundry Java Client
https://github.com/cloudfoundry/cf-java-client
The official Java client for CloudFoundry API

https://github.com/reactor/reactor-scala-extensions
Idiomatic Scala for Reactor

Reactor
Tomorrow
Near-and-far Future<T>

Near-and-far Future<T>
Reactor
Tomorrow

Reactor
Tomorrow
Near-and-far future

2019
2020
2017
2018
the Road from Here

2017
First,
a patch release

3.1.33.1.0
September
October
November
December
3.1.1 3.1.2

3.1.33.1.0
September
October
November
December
3.1.1 3.1.2
limitRequest,
Kotlin extensions...

3.1.33.1.0
September
October
November
December
3.1.1 3.1.2
index,
blockOptional...

3.1.33.1.0
September
October
November
December
3.1.1 3.1.2
Mostly bugfixes...

2018Themes for

Continue On Error

errors are terminal

continue on
(transient) errors?

NowFlux.range(0, 3)
.flatMap(v -> Mono.just(v)
.map(i -> 100 / i)
.doOnError(...)
.onErrorResume(
Mono.empty()
)
);
proces...

TomorrowFlux.range(0, 3)
.map(i -> 100 / i)
.errorStrategyContinue()
.filter(i -> 100 / i > 4);
this is not impacted
and c...

Observability & Traceability

Micrometer
“SLF4J for metrics”

Sleuth & Zipkin
Currently focusing on tracing WebFlux and WebClient
any guess as to why these are different?
flatMap
conca...

reactor-netty

API iteration release : 0.8.x
Immutable server and client builders
Lifecycle and interceptor API (doOnRequest...)
Initial ...

API iteration release : 0.8.x
HttpClient.prepare()
.port(c.address().getPort())
.wiretap()
.get()
.uri("/test/test.css")
....

Beyond 0.8
HTTP 2 support
Plug-And-Play Metrics
Connection Pool improvements
Backpressure strategies

File I/O Addon?

Java 9
continuously improve support

Java 9
continuously improve support
RSocket

Exploring RSocket (rsocket.io)
Duplex flow-control support
Multi-transport and multi-language
Decoupled from any serializa...

Beyondand

Reactor Kore?

Reactor Console?

ADBA ?

Just Wondering
Flux Buffers Lifecycle Hooks ?
Persistent Flux ?
Coordinated demand ?

What do you need ?

The end
Thank You!

Questions?

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