Resilient Applications using Spring Cloud Corneil du Plessis 

Defnition Resilient adjective 1. (of a person or animal) able to withstand or recover quickly from difcult conditions. synonyms: strong, tough, hardy; 2. (of a substance or object) able to recoil or spring back into shape after bending, stretching, or being compressed. 

Spring Cloud - Landscape 

Principles - The 12 Factors 1. One Codebase in revision control 2. Dependencies must be explicit 3. Confi in environment 4. Backini services as attached resources 5. Build, release, run as separate stages 6. One or more stateless processes 7. Export services via port bindini 8. Concurrency in Process over threads 9. Disposable with quick startup and graceful shutdown. 10. Keep development/test/production in parity 11. Treat lois as event streams 12. Admin/management tasks as one-of processes https://12factor.net 

Spring Cloud – Abstractions / Projects • Open Service Broker • Service Registry & Discovery • Circuit Breaker • Confguration Server • API Gateway • Bus • Connectors • Distributed Tracing • Security • Function • Data Flow • Stream • Task • Contract 

Spring Cloud – Providers • Cloud Foundry • Connectors for RabbitMQ and SMTP, Relational Databases and MongoDB, Redis, Cassandra • Heroku • Connectors for PostgreSQL, MySQL, Redis, MongoDB, RabbitMQ • Google Cloud Platform in Beta Amazon Web Services • Messaging for SQS • Spring Cache for Elasticache • SNS Endoints • Named Resources on CloudFormation • JDBC Datasource on named RDS instance • ResourceLoader for S3 

Spring Cloud Function • Abstractions for Function, Consumer and Supplier leveraging Project Reactor • Binding to HTTP endpoints or stream listeners / publishers for RabbitMQ or Apache Kafka • Adapters for AWS Lambda, Microsoft Azure, Apache OpenWhisk 

Routing & API Gateway • Netfix Zuul • Spring Cloud Gateway – WebFlux 

Circuitbreaker • Netfix Hystrix • Resilient4J • Hystrix Dashboard 

Load Balancer • RestTemplate • Ribbon • Feign • @LoadBalanced 

Spring Cloud OpenFeign • Feign Client • DiscoveryClient support • @EnableFeignClients • @FeignClient 

Spring Retry • RetryTemplate • Policies • Timeout • Backof • RetryContext • Stateful or Stateless • Listeners • @EnableRetry and @Retryable 

Demo Let’s look at some code. 

Finally • Contact: @corneil • Code: https://github.com/corneil/cf-demo • Resources: • https://cloud.spring.io Questions? 

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