Oleg Zhurakousky Olga Maciaszek-Sharma What’s new in Spring Cloud? Copyright © 2020 VMware, Inc. or its affiliates.

Oleg Zhurakousky Twitter: @z_oleg Olga Maciaszek-Sharma Twitter: @olga_maciaszek

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Spring Cloud Square Spring Boot and Spring Cloud integrations for Retrofit and OkHttp. ● WebClient support for Retrofit interface clients ● Auto-configurations for Retrofit and OkHttp ● Load-balancing ● Tracing for OkHttp ● Only Retrofit annotations ● Incubator project ● Maintenance timeline - 2021.x release train

Spring Cloud Square

Spring interface clients Interface clients for within Spring Framework. ● A first-class solution in Framework replacing third-party integrations ● HTTP already present in Spring 6 milestones ○ HttpServiceProxyFactory , @HttpExchange annotation ○ Support for HttpMethod, @PathVariable, @RequestAttribute , @RequestBody, @RequestHeader , @RequestParam ○ Support for both blocking and non-blocking mode ○ Planned multipart support ● Planned RSocket interface client

Spring HTTP interface client

Spring Cloud Observability Moving out of Spring Cloud Sleuth to Micrometer 1.10 and direct instrumentation in projects ● Micrometer 1.10 Tracing with Observation API ○ Observation ○ ObservationHandler ● Planned: tracing set-up by Spring Boot 3 ● Spring Cloud Sleuth maintained for 2021.x

Spring Cloud Observability - Observation

Spring Cloud Observability - ObservationHandler

RSocket Reactive Streams semantics on protocol level ● Message-driven, asynchronous ● No client/ server distinction once connection is made ● 4 modes ○ Fire and Forget ○ Request/ Response ○ Request/ Stream ○ Channel

RSocket Reactive Streams semantics on protocol level ● Binary ● Flow control ○ Backpressure ○ Leasing ● Protocol support: ○ TCP ○ WebSockets ○ Aeron ○ HTTP/3 (QUIC)?

RSocket support in Spring Support in spring-messaging ● RSocketRequester fluent API ● @MessageMapping and @ConnectMapping annotated responders

RSocket support in Spring Support in spring-messaging ● MetadataExtractor

RSocket Broker A specialized distributed broker for RSocket ● Service discovery ● Load-balancing ● Fault tolerance ● Security

RSocket Broker RSocket Broker Service 1 Service 3 Service 2 Service 3 RSocket Broker RSocket Broker Service 1 Service 2

RSocket HTTP Bridge Seamless routing of HTTP requests through RSocket Broker ● POST requests ● serviceId and RSocket endpoint resolved from path ● Support for byte arrays and payload decoding ● RSocket Broker tags resolved from HTTP headers ● RSocket interaction mode resolved from URI or default configuration ● Support for RSocket Broker WellKnownKey ● Spring Cloud Gateway integration

Demo

Spring Native Support for GraalVM native images in Spring ● Initial support provided by the Spring Native project moving over to Spring 6 ● Compatibility ● Native configuration files ● AOT plugin - AOT transformations

Spring Cloud Native support Supported starters ● Spring Cloud Config Client ● Spring Cloud Config Server ● Spring Cloud Netflix Eureka Client ● Spring Cloud Sleuth ● Spring Cloud Function ● Spring Cloud Stream ● Spring Cloud Task ● Spring Cloud Sleuth Zipkin

Spring Cloud Native support Planned support ● Spring Cloud Gateway ● Spring Cloud OpenFeign ● Spring Cloud CircuitBreaker ● Spring Cloud Kubernetes ● Spring Cloud LoadBalancer

Spring Cloud Function Exposes Java Functions as Spring’s managed components ● Promotes implementation of business logic as functions ○ Supplier, ○ Function, ○ Consumer ● Function Composition ● Transparent Type conversion ● POJO Functions ● Reactive Support ● Deployment of packaged functions ● Adapters to serverless platforms

Demo

Spring Cloud Function Adapters Extensions to expose java functions to different invocation models ● AWS Lambda ● HTTP ● gRPC ● RSocket ● Azure ● Google Functions ● CloudEvent

Spring Cloud Function Adapters - gRPC Exposes user functions via gRPC ● Supports two operation modes - client & server ● 4 interaction modes (request/reply, server/client/bidirectional-streaming) ● Pluggable protobuf extension OR ● Message centric

Demo

Spring Cloud Function Adapters - RSocket Exposes user functions as RSocket endpoints ● Supports all 4 RSocket invocation models ○ Fire and Forget ○ Request/ Response ○ Request/ Stream ○ Channel

Demo

Spring Cloud Function Adapters - AWS Lambda ● Provides ability to represent simple Java Functions as AWS Lambda ● Supports many event types ● Custom Runtime ● GraalVM support via Spring Native

Demo

Spring Cloud Stream Event stream processing (ESP) is the practice of taking action on a series of data points that originate from a system that continuously creates data. https://hazelcast.com/glossary/event-stream-processing/

Spring Cloud Stream Framework to enable “event stream processing” applications - microservices ● Spring Boot driven ● Connects Messaging Brokers with user code using Destination Binders ● Core features ○ Partitioning ○ Consumer Groups ○ Message Headers ○ Destination provisioning ● Message centric ● Spring Cloud Function as programming model

Spring Cloud Stream What’s new ● Native support ● StreamBridge ● Mono Repo ● Reactive Kafka Binder ● Complete removal of annotation-based programming model

Demo

Resources ● Demo code ● Spring Cloud Square ● Spring HTTP interface clients ● Micrometer Tracing ● RSocket ● Spring support for RSocket ● RSocket Broker ● RSocket HTTP Bridge

Thank you © 2020 Spring. A VMware-backed project.