Cloud Foundry allows developers to deploy easily and often their applications. This is a great thing but it is only a part of the whole picture. In order to smoothly scale an application some patterns and basic architecture concepts must be taken into consideration. With Spring Boot, applications can be split into smaller parts called Microservices, which can be scaled in a more fine-grained manner. In addition Spring Cloud provides tools to quickly build some of the common patterns in distributed systems (e.g. configuration management, service discovery, circuit breakers).

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Microservices with
Spring and Cloud
Foundry
Alain Sahli

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Agenda
• Introduction
• Microservices architecture
• Spring Cloud components
• Demo

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GitHub Builds & Deploys
Source: https://github.com/blog/1241-deploying-at-github

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GitHub Builds & Deploys
Source: https://github.com/blog/1241-deploying-at-github
175 deploys!

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Microservices

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Microservices
LB

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Microservices

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Microservices

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Communication Between Services

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Communication Between Services

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Communication Between Services

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Communication Between Services

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Service Discovery cont’d

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Service Discovery cont’d

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Service Discovery cont’d

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Client-Side Load Balancing

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Client-Side Load Balancing
LB

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Resiliency

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Resiliency

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Circuit Breaker

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Circuit Breaker

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Circuit Breaker
1x every minute

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API Gateway
Browser

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API Gateway
Browser

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Handling Configuration

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Handling Configuration

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Handling Configuration

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Handling Configuration

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Summary

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Summary
• Service discovery: Netflix Eureka

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Summary
• Service discovery: Netflix Eureka
• Client-side load balancing: Netflix Ribbon

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Summary
• Service discovery: Netflix Eureka
• Client-side load balancing: Netflix Ribbon
• Circuit breaker: Netflix Hystrix

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Summary
• Service discovery: Netflix Eureka
• Client-side load balancing: Netflix Ribbon
• Circuit breaker: Netflix Hystrix
• API gateway: Netflix Zuul

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Summary
• Service discovery: Netflix Eureka
• Client-side load balancing: Netflix Ribbon
• Circuit breaker: Netflix Hystrix
• API gateway: Netflix Zuul
• Configuration: Spring Cloud Config
• Spring Cloud Bus for refreshing the config

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Spring IO
CLOUD
SERVICE REGISTRY,
CIRCUIT BREAKER, METRICS
CORE
FRAMEWORK SECURITY GROOVY REACTOR
IOEXECUTIONIOFOUNDATION
GRAILS
FULL STACK, WEB
XD
STREAMS, TAPS, JOBS
BOOT
BOOTABLE, MINIMAL, OPS-READY
BATCH
JOBS, STEPS,
READERS, WRITERS
DATA
RELATIONAL DATA NON-RELATIONAL DATA
BIG DATA
INGESTION, EXPORT,
ORCHESTRATION, HADOOP
WEB
CONTROLLERS, REST,
WEBSOCKET
INTEGRATION
CHANNELS, FILTERS,
ADAPTERS, TRANSFORMERS
IOCOORDINATION

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Spring Boot: Short Introduction

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Spring Boot: Short Introduction
“Takes an opinionated view of building
production-ready Spring applications”

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Spring Boot: Short Introduction
• Create standalone Spring applications
• Provide opinionated “starter” POMs to simplify
your maven configuration
• Automatically configure Spring whenever
possible
• Provide production-ready features such as metrics,
health checks and externalized configuration
“Takes an opinionated view of building
production-ready Spring applications”

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Spring Boot: Key Features

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Spring Boot: Key Features
MyApplication.java:
@SpringBootApplication
public class EurekaServer {
public static void main(String[] args) {
SpringApplication.run(MyApplication.class, args);
}
}

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Spring Boot: Key Features
MyApplication.java:
@SpringBootApplication
public class EurekaServer {
public static void main(String[] args) {
SpringApplication.run(MyApplication.class, args);
}
}
pom.xml:
<dependency>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-starter-web</artifactId>
</dependency>

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Spring Boot: Key Features
MyApplication.java:
@SpringBootApplication
public class EurekaServer {
public static void main(String[] args) {
SpringApplication.run(MyApplication.class, args);
}
}
pom.xml:
<dependency>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-starter-web</artifactId>
</dependency>
Configuration file: application.yml, bootstrap.yml

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Spring Cloud
Bus
Connectors
Starters
Amazon Web
Services
Config
Cloud Foundry
Netflix
CLI

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Spring Cloud
Bus
StartersConfig
Cloud Foundry
Netflix

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Spring Cloud Config: Server
Spring Cloud
Config Server
GIT
SVN
File

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Spring Cloud Config: Server
Spring Cloud
Config Server
GIT
SVN
File
ConfigServer.java:
@SpringBootApplication
@EnableConfigServer
public class ConfigServer {…}

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Spring Cloud Config: Server
Spring Cloud
Config Server
GIT
SVN
File
ConfigServer.java:
@SpringBootApplication
@EnableConfigServer
public class ConfigServer {…}
application.yml
spring.cloud.config.git.uri: https://github.com/…

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Spring Cloud Config: Client
Spring Cloud
Config Server
Application
Spring Cloud
Config Client
Application
Spring Cloud
Config Client
Application
Spring Cloud
Config Client

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Spring Cloud Config: Client
Spring Cloud
Config Server
Application
Spring Cloud
Config Client
Application
Spring Cloud
Config Client
Application
Spring Cloud
Config Client
bootstrap.yml:
spring.cloud.config.uri: ${vcap.services.configserver.credentials.uri}

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Spring Cloud Bus
Spring Cloud
Config Server
Application
Application
Application

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Spring Cloud Netflix: Eureka
Spring Cloud
Eureka Server
Application
Spring Cloud
Eureka Client
Application
Spring Cloud
Eureka Client
Application
Spring Cloud
Eureka Client

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Spring Cloud Netflix: Eureka
Spring Cloud
Eureka Server
Application
Spring Cloud
Eureka Client
Application
Spring Cloud
Eureka Client
Application
Spring Cloud
Eureka Client
EurekaServer.java:
@SpringBootApplication
@EnableEurekaServer
public class EurekaServer {…}

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Spring Cloud Netflix: Eureka
Spring Cloud
Eureka Server
Application
Spring Cloud
Eureka Client
Application
Spring Cloud
Eureka Client
Application
Spring Cloud
Eureka Client
EurekaServer.java:
@SpringBootApplication
@EnableEurekaServer
public class EurekaServer {…}
Application.java:
@SpringBootApplication
@EnableEurekaClient
public class Application {…}

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Spring Cloud Netflix: Ribbon

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Spring Cloud Netflix: Ribbon
RibbonSample.java:
public class RibbonSample {
@Autowired
private RestTemplate restTemplate;
public void foo() {
restTemplate.postForLocation(“http://customers/add”, customer);
}
}

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Spring Cloud Netflix: Zuul

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Spring Cloud Netflix: Zuul
ApiGateway.java:
@SpringBootApplication
@EnableZuulProxy
public class ApiGateway {…}

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Spring Cloud Netflix: Zuul
ApiGateway.java:
@SpringBootApplication
@EnableZuulProxy
public class ApiGateway {…}
application.yml:
zuul:
ignoredServices: *
routes:
users: /myusers/**

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Spring Cloud Netflix: Hystrix

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Spring Cloud Netflix: Hystrix
PentagonApplication.java:
@SpringBootApplication
@EnableHystrix
public class PentagonApplication {…}

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Spring Cloud Netflix: Hystrix
PentagonApplication.java:
@SpringBootApplication
@EnableHystrix
public class PentagonApplication {…}
Store.java:
@HystrixCommand(fallbackMethod = "defaultStores")
public Object getStores(Map<String, Object> parameters) {
//Call another service over HTTP (ribbon)
}
public Object defaultStores(Map<String, Object> parameters) {
return /* some fallback data */;
}

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Spring Cloud Netflix: Hystrix
PentagonApplication.java:
@SpringBootApplication
@EnableHystrix
public class PentagonApplication {…}
Store.java:
@HystrixCommand(fallbackMethod = "defaultStores")
public Object getStores(Map<String, Object> parameters) {
//Call another service over HTTP (ribbon)
}
public Object defaultStores(Map<String, Object> parameters) {
return /* some fallback data */;
}

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Spring Cloud Netflix: Hystrix
PentagonApplication.java:
@SpringBootApplication
@EnableHystrix
public class PentagonApplication {…}
Store.java:
@HystrixCommand(fallbackMethod = "defaultStores")
public Object getStores(Map<String, Object> parameters) {
//Call another service over HTTP (ribbon)
}
public Object defaultStores(Map<String, Object> parameters) {
return /* some fallback data */;
}

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Spring Cloud Netflix: Hystrix Dashboard

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Spring Cloud Netflix: Turbine
Turbine

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Spring Cloud Netflix: Turbine
Turbine
Hystrix
Dashboard

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Demo Application
Zuul Server
Service
Discovery
Eureka
Customers Stores
Config
Server
Hystrix
Dashboard
Browser
Turbine

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Summary

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Summary
• Netflix Eureka: Service registry & discovery

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Summary
• Netflix Eureka: Service registry & discovery
• Netflix Hystrix: Circuit breaker and dashboard

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Summary
• Netflix Eureka: Service registry & discovery
• Netflix Hystrix: Circuit breaker and dashboard
• Netflix Turbine: Aggregate hystrix streams

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Summary
• Netflix Eureka: Service registry & discovery
• Netflix Hystrix: Circuit breaker and dashboard
• Netflix Turbine: Aggregate hystrix streams
• Netflix Ribbon: Client-side load-balancing

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Summary
• Netflix Eureka: Service registry & discovery
• Netflix Hystrix: Circuit breaker and dashboard
• Netflix Turbine: Aggregate hystrix streams
• Netflix Ribbon: Client-side load-balancing
• Netflix Zuul: Reverse proxy for API gateway

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Summary
• Netflix Eureka: Service registry & discovery
• Netflix Hystrix: Circuit breaker and dashboard
• Netflix Turbine: Aggregate hystrix streams
• Netflix Ribbon: Client-side load-balancing
• Netflix Zuul: Reverse proxy for API gateway
• Spring Cloud Config: Centralized configuration

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Summary
• Netflix Eureka: Service registry & discovery
• Netflix Hystrix: Circuit breaker and dashboard
• Netflix Turbine: Aggregate hystrix streams
• Netflix Ribbon: Client-side load-balancing
• Netflix Zuul: Reverse proxy for API gateway
• Spring Cloud Config: Centralized configuration
• Spring Cloud Bus: Publish events over RabbitMQ

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Summary
• Netflix Eureka: Service registry & discovery
• Netflix Hystrix: Circuit breaker and dashboard
• Netflix Turbine: Aggregate hystrix streams
• Netflix Ribbon: Client-side load-balancing
• Netflix Zuul: Reverse proxy for API gateway
• Spring Cloud Config: Centralized configuration
• Spring Cloud Bus: Publish events over RabbitMQ
• Spring Cloud Netflix: Configure Netflix components

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Q/A

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Customer-oriented
User-friendly
Proficient
Qualitative
Efficient
3
…the open source integrator