{"id":41333,"date":"2015-07-02T13:00:18","date_gmt":"2015-07-02T10:00:18","guid":{"rendered":"http:\/\/www.javacodegeeks.com\/?p=41333"},"modified":"2015-07-01T12:12:56","modified_gmt":"2015-07-01T09:12:56","slug":"learning-spring-cloud-writing-a-microservice","status":"publish","type":"post","link":"https:\/\/www.javacodegeeks.com\/2015\/07\/learning-spring-cloud-writing-a-microservice.html","title":{"rendered":"Learning Spring-Cloud – Writing a microservice"},"content":{"rendered":"

Continuing my Spring-Cloud learning journey, earlier<\/a> I had covered how to write the infrastructure components of a typical Spring-Cloud<\/a> and Netflix OSS<\/a> based micro-services environment – in this specific instance two critical components, Eureka to register and discover services and Spring Cloud Configuration to maintain a centralized repository of configuration for a service. Here I will be showing how I developed two dummy micro-services, one a simple “pong” service and a “ping” service which uses the “pong” service.<\/p>\n

\"Sample-ping-pong\"<\/a><\/p>\n

Sample-Pong microservice<\/h2>\n

The endpoint handling the “ping” requests is a typical Spring MVC based endpoint:<\/p>\n

@RestController\r\npublic class PongController {\r\n\r\n    @Value(\"${reply.message}\")\r\n    private String message;\r\n\r\n    @RequestMapping(value = \"\/message\", method = RequestMethod.POST)\r\n    public Resource<MessageAcknowledgement> pongMessage(@RequestBody Message input) {\r\n        return new Resource<>(\r\n                new MessageAcknowledgement(input.getId(), input.getPayload(), message));\r\n    }\r\n\r\n}<\/pre>\n
It gets a message and responds with an acknowledgement. Here the service utilizes the Configuration server in sourcing the “reply.message”<\/i> property. So how does the “pong” service find the configuration server, there are potentially two ways – directly by specifying the location of the configuration server, or by finding the Configuration server via Eureka. I am used to an approach where Eureka is considered a source of truth, so in this spirit I am using Eureka to find the Configuration server. Spring Cloud makes this entire flow very simple, all it requires is a “bootstrap.yml” property file with entries along these lines:<\/p>\n
---\r\nspring:\r\n  application:\r\n    name: sample-pong\r\n  cloud:\r\n    config:\r\n      discovery:\r\n        enabled: true\r\n        serviceId: SAMPLE-CONFIG\r\n\r\neureka:\r\n  instance:\r\n    nonSecurePort: ${server.port:8082}\r\n  client:\r\n    serviceUrl:\r\n      defaultZone: http:\/\/${eureka.host:localhost}:${eureka.port:8761}\/eureka\/<\/pre>\n
The location of Eureka is specified through the “eureka.client.serviceUrl”<\/i> property and the “spring.cloud.config.discovery.enabled” is set to “true” to specify that the configuration server is discovered via the specified Eureka server.<\/p>\n
Just a note<\/b>, this means that the Eureka and the Configuration server have to be completely up before trying to bring up the actual services, they are the pre-requisites and the underlying assumption is that the Infrastructure components are available at the application boot time.<\/p>\n
The Configuration server has the properties for the “sample-pong” service, this can be validated by using the Config-servers endpoint – http:\/\/localhost:8888\/sample-pong\/default, 8888 is the port where I had specified for the server endpoint, and should respond with a content along these lines:
 
<\/div> <\/div><\/p>\n
\"name\": \"sample-pong\",\r\n  \"profiles\": [\r\n    \"default\"\r\n  ],\r\n  \"label\": \"master\",\r\n  \"propertySources\": [\r\n    {\r\n      \"name\": \"classpath:\/config\/sample-pong.yml\",\r\n      \"source\": {\r\n        \"reply.message\": \"Pong\"\r\n      }\r\n    }\r\n  ]\r\n}<\/pre>\n
As can be seen the “reply.message”<\/i> property from this central configuration server will be used by the pong service as the acknowledgement message<\/p>\n
Now to set up this endpoint as a service, all that is required is a Spring-boot based entry point along these lines:<\/p>\n
@SpringBootApplication\r\n@EnableDiscoveryClient\r\npublic class PongApplication {\r\n    public static void main(String[] args) {\r\n        SpringApplication.run(PongApplication.class, args);\r\n    }\r\n}<\/pre>\n
and that completes the code for the “pong” service.<\/p>\n
Sample-ping micro-service<\/h2>\n
So now onto a consumer of the “pong” micro-service, very imaginatively named the “ping” micro-service. Spring-Cloud and Netflix OSS offer a lot of options to invoke endpoints on Eureka registered services, to summarize the options that I had:<\/p>\n
    \n
  1. Use raw Eureka DiscoveryClient to find the instances hosting a service and make calls using Spring’s RestTemplate<\/a>.<\/li>\n
  2. Use Ribbon<\/a>, a client side load balancing solution which can use Eureka to find service instances<\/li>\n
  3. Use Feign<\/a>, which provides a declarative way to invoke a service call. It internally uses Ribbon.<\/li>\n<\/ol>\n
    I went with Feign. All that is required is an interface which shows the contract to invoke the service:<\/p>\n
    package org.bk.consumer.feign;\r\n\r\nimport org.bk.consumer.domain.Message;\r\nimport org.bk.consumer.domain.MessageAcknowledgement;\r\nimport org.springframework.cloud.netflix.feign.FeignClient;\r\nimport org.springframework.http.MediaType;\r\nimport org.springframework.web.bind.annotation.RequestBody;\r\nimport org.springframework.web.bind.annotation.RequestMapping;\r\nimport org.springframework.web.bind.annotation.RequestMethod;\r\nimport org.springframework.web.bind.annotation.ResponseBody;\r\n\r\n@FeignClient(\"samplepong\")\r\npublic interface PongClient {\r\n\r\n    @RequestMapping(method = RequestMethod.POST, value = \"\/message\",\r\n            produces = MediaType.APPLICATION_JSON_VALUE, consumes = MediaType.APPLICATION_JSON_VALUE)\r\n    @ResponseBody\r\n    MessageAcknowledgement sendMessage(@RequestBody Message message);\r\n}<\/pre>\n
    The annotation @FeignClient(“samplepong”)<\/i> internally points to a Ribbon “named” client called “samplepong”. This means that there has to be an entry in the property files for this named client, in my case I have these entries in my application.yml file:<\/p>\n
    samplepong:\r\n  ribbon:\r\n    DeploymentContextBasedVipAddresses: sample-pong\r\n    NIWSServerListClassName: com.netflix.niws.loadbalancer.DiscoveryEnabledNIWSServerList\r\n    ReadTimeout: 5000\r\n    MaxAutoRetries: 2<\/pre>\n
    The most important entry here is the “samplepong.ribbon.DeploymentContextBasedVipAddresses” which points to the “pong” services Eureka registration address using which the service instance will be discovered by Ribbon.<\/p>\n
    The rest of the application is a routine Spring Boot application. I have exposed this service call behind Hystrix<\/a> which guards against service call failures and essentially wraps around this FeignClient:<\/p>\n
    package org.bk.consumer.service;\r\n\r\nimport com.netflix.hystrix.contrib.javanica.annotation.HystrixCommand;\r\nimport org.bk.consumer.domain.Message;\r\nimport org.bk.consumer.domain.MessageAcknowledgement;\r\nimport org.bk.consumer.feign.PongClient;\r\nimport org.springframework.beans.factory.annotation.Autowired;\r\nimport org.springframework.beans.factory.annotation.Qualifier;\r\nimport org.springframework.stereotype.Service;\r\n\r\n@Service(\"hystrixPongClient\")\r\npublic class HystrixWrappedPongClient implements PongClient {\r\n\r\n    @Autowired\r\n    @Qualifier(\"pongClient\")\r\n    private PongClient feignPongClient;\r\n\r\n    @Override\r\n    @HystrixCommand(fallbackMethod = \"fallBackCall\")\r\n    public MessageAcknowledgement sendMessage(Message message) {\r\n        return this.feignPongClient.sendMessage(message);\r\n    }\r\n\r\n    public MessageAcknowledgement fallBackCall(Message message) {\r\n        MessageAcknowledgement fallback = new MessageAcknowledgement(message.getId(), message.getPayload(), \"FAILED SERVICE CALL! - FALLING BACK\");\r\n        return fallback;\r\n    }\r\n}<\/pre>\n
    “Boot”ing up<\/h2>\n
    I have dockerized my entire set-up, so the simplest way to start up the set of applications is to first build the docker images for all of the artifacts this way:<\/p>\n
    mvn clean package docker:build -DskipTests<\/pre>\n
    and bring all of them up using the following command, the assumption being that both docker and docker-compose are available locally:<\/p>\n
    docker-compose up<\/pre>\n
    Assuming everything comes up cleanly, Eureka should show all the registered services, at http:\/\/dockerhost:8761 url –<\/p>\n
    \"EurekaConsole-fullping\"<\/a><\/p>\n
    The UI of the ping application should be available at http:\/\/dockerhost:8080 url –<\/p>\n
    \"SampleSpringCloudView\"<\/a><\/p>\n
    Additionally a Hystrix dashboard should be available to monitor the requests to the “pong” app at this url http:\/\/dockerhost:8989\/hystrix\/monitor?stream=http%3A%2F%2Fsampleping%3A8080%2Fhystrix.stream:<\/p>\n
    \"SpringCloud-Hystrix\"<\/a><\/p>\n
    References<\/h2>\n
      \n
    1. The code is available at my github location<\/a> – https:\/\/github.com\/bijukunjummen\/spring-cloud-ping-pong-sample<\/li>\n
    2. Most of the code is heavily borrowed from the spring-cloud-samples repository<\/a> – https:\/\/github.com\/spring-cloud-samples<\/li>\n<\/ol>\n
      \n\n\n\n
      Reference: <\/span><\/td>\nLearning Spring-Cloud – Writing a microservice<\/a> from our JCG partner<\/a> Biju Kunjummen at the all and sundry<\/a> blog.<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n<\/div>\n","protected":false},"excerpt":{"rendered":"
      Continuing my Spring-Cloud learning journey, earlier I had covered how to write the infrastructure components of a typical Spring-Cloud and Netflix OSS based micro-services environment – in this specific instance two critical components, Eureka to register and discover services and Spring Cloud Configuration to maintain a centralized repository of configuration for a service. Here I …<\/p>\n","protected":false},"author":236,"featured_media":240,"comment_status":"open","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[8],"tags":[960,30,992],"class_list":["post-41333","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-enterprise-java","tag-microservices","tag-spring","tag-spring-cloud"],"yoast_head":"\nLearning Spring-Cloud - Writing a microservice - Java Code Geeks<\/title>\n<meta name=\"description\" content=\"Continuing my Spring-Cloud learning journey, earlier I had covered how to write the infrastructure components of a typical Spring-Cloud and Netflix OSS\" \/>\n<meta name=\"robots\" content=\"index, follow, max-snippet:-1, max-image-preview:large, max-video-preview:-1\" \/>\n<link rel=\"canonical\" href=\"https:\/\/www.javacodegeeks.com\/2015\/07\/learning-spring-cloud-writing-a-microservice.html\" \/>\n<meta property=\"og:locale\" content=\"en_US\" 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