Spring Cloud Example

  [Spring Cloud](http://spring-projects.ru/projects/spring-cloud/)  [Kotlin](https://kotlinlang.ru/)  .

:

• In English
• Bahasa Indonesia
• In het Nederlands
• Em Portugus

💚 -.

Cloud-native - , .

, , , HTTP. - . . .

(c) vkhorikov /

  ,  "".           . 

_ ?_

Service Discovery

	URL
discovery-server	http://host:8761/eureka

Spring Cloud :

• Spring Cloud Consul

• Spring Cloud Zookeeper

• Spring Cloud Netflix

    - Spring Cloud Netflix.     Netflix      .
  
    Eureka.     ,      (   Eureka).
  

, (Discovery servers) , . :

eureka.client.register-with-eureka=true
eureka.client.fetch-registry=true    

Eureka , , , . , , Discovery Server - , .

Eureka :

• (   ).
  

• __ Discovery .
• , .

Eureka (aka , dashboard) . .

  http://localhost:8761

Weather Service

	URL
weather-service	http://host:port/weather

@EnableDiscoveryClient , WeatherServiceApplication Discovery Server Discovery Server .

Weather App

	URL
weather-app	http://host:port/current/weather

Datetime Service

	URL
datetime-service	http://host:port/datetime

@EnableDiscoveryClient , DatetimeServiceApplication Discovery Server Discovery Server .

Datetime App

	URL
datetime-app	http://host:port/current/datetime

Client

	URL
client	http://host:port

@EnableDiscoveryClient , ClientApplication Discovery Server.

   Eureka,     ,   - .      false:

eureka.client.register-with-eureka=false

 ,      ...  .

       (cascading failure) - ,        .

?

• .
  > - . , .
• (graceful degradation)
  > .

" " (Circuit breaker design pattern) - , . .

Hystrix

Netflix Hystrix - ...

. ?

Hystrix

	URL
hystrix-dashboard	http://host:port/hystrix

: Circuit Breaker: Hystrix Dashboard( .)

Turbine

Module	URL
turbine	http://host:3000/turbine.stream

Hystrix . , , . .

Turbine ( Spring Cloud Netflix) (streams) Hystrix , Hystrix .

:

turbine.app-config=weather-app,datetime-app
turbine.cluster-name-expression='default'

    .

1. .

2. .

3. 📗 TODO

   : [Gradle](https://gradle.org/)    .
   

IntelliJ IDEA, STS / Eclipse, NetBeans .

Gradle

./gradlew :discovery-server:bootRun
./gradlew :weather-service:bootRun
./gradlew :weather-app:bootRun
./gradlew :client:bootRun
./gradlew :datetime-service:bootRun
./gradlew :datetime-app:bootRun
./gradlew :turbine:bootRun
./gradlew :hystrix-dashboard:bootRun

IntelliJ IDEA

1. ( build.gradle) IntelliJ IDEA.

2. Gradle (      ,       ).
   

3.       ,     .    :
   

   1. DiscoveryServerApplication
   2. WeatherServiceApplication
   3. WeatherAppApplication
   4. ClientApplication
   5. DatetimeServiceApplication
   6. DatetimeAppApplication
   7. TurbineApplication
   8. HystrixDashboardApplication

: , , .

📗 TODO

Travis CI

 [GNU GPL v3](https://www.gnu.org/licenses/gpl-3.0.ru.html).

: Google Code Archive.