Start several projects, there are
8761 Eureka server, is the server
microservice-provider-user starts 7900, 7901 and is a service provider
microservice-provider-user2 starts 7902, 7903 and is a service provider
microservice-customer-movie-ribbon starts 8010 and is a service consumer
16.2. Customizing the Ribbon Client
In the project microservice-customer-movie-ribbon
TestConfiguration. Note that it cannot be placed under the package that @ComponentScan of the startup class can scan. ( The startup class can be scanned into the same directory or annotations available under subpackages )
package com.ldgx.config;
import org.springframework.context.annotation.Bean;
import org.springframework.context.annotation.Configuration;
import com.netflix.client.config.IClientConfig;
import com.netflix.loadbalancer.IRule;
import com.netflix.loadbalancer.RandomRule;
/**
* The TestConfiguration has to be @Configuration but take care that it is not in a @ComponentScan for the main application context,
* otherwise it will be shared by all the @RibbonClients. If you use @ComponentScan (or @SpringBootApplication)
* you need to take steps to avoid it being included (for instance put it in a separate, non-overlapping package, or specify the packages to scan explicitly in the @ComponentScan).
* @author Administrator
*
*/
@Configuration
public class TestConfiguration {
//@Autowired
//private IClientConfig config;
@Bean
public IRule ribbonRule(IClientConfig config) {
return new RandomRule();//Random rule
}
}
Startup class com/ldgx/eshop/MicroserviceCustomerMovie1Application.java added
@RibbonClient(name="microservice-provider-user",configuration = TestConfiguration.class)
Controller
package com.ldgx.eshop.controller;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.cloud.client.ServiceInstance;
import org.springframework.cloud.client.loadbalancer.LoadBalancerClient;
import org.springframework.web.bind.annotation.RequestMapping;
import org.springframework.web.bind.annotation.RestController;
import org.springframework.web.client.RestTemplate;
@RestController
public class UseDemoController {
@Autowired
private RestTemplate restTemplate;
@Autowired
private LoadBalancerClient loadBalanceClient;
@RequestMapping("/demo")
public String useDemo () {
return restTemplate.getForObject("http://microservice-provider-user/demo/dd", String.class);//Parameter 1 makes eureka's service-id, which is a virtual host name, you can use eureka.instance.secure. virtual-host-name definition, if not https, use eureka.instance.virtual-host-name
}
@RequestMapping("/test")
public String test() {
ServiceInstance instance = this.loadBalanceClient.choose("microservice-provider-user");
System.out.println(instance.getHost() + "," + instance.getPort() +","+instance.getServiceId());
ServiceInstance instance2 = this.loadBalanceClient.choose("microservice-provider-user2");
System.out.println(instance2.getHost() + "," + instance2.getPort() +","+instance2.getServiceId());
return "1";
}
}
When accessing the address http://localhost:8010/test on the browser
The project microservice-customer-movie-ribbon prints the result:
IDXZC2FNKSQOYM6,7900,microservice-provider-user IDXZC2FNKSQOYM6,7903,microservice-provider-user2 IDXZC2FNKSQOYM6,7901,microservice-provider-user IDXZC2FNKSQOYM6,7902,microservice-provider-user2 IDXZC2FNKSQOYM6,7901,microservice-provider-user IDXZC2FNKSQOYM6,7903,microservice-provider-user2 IDXZC2FNKSQOYM6,7900,microservice-provider-user IDXZC2FNKSQOYM6,7902,microservice-provider-user2 IDXZC2FNKSQOYM6,7900,microservice-provider-user IDXZC2FNKSQOYM6,7903,microservice-provider-user2 IDXZC2FNKSQOYM6,7901,microservice-provider-user IDXZC2FNKSQOYM6,7902,microservice-provider-user2 IDXZC2FNKSQOYM6,7901,microservice-provider-user IDXZC2FNKSQOYM6,7903,microservice-provider-user2 IDXZC2FNKSQOYM6,7900,microservice-provider-user IDXZC2FNKSQOYM6,7902,microservice-provider-user2 IDXZC2FNKSQOYM6,7901,microservice-provider-user IDXZC2FNKSQOYM6,7903,microservice-provider-user2 IDXZC2FNKSQOYM6,7900,microservice-provider-user IDXZC2FNKSQOYM6,7902,microservice-provider-user2Get the result: microservice-provider-user is random, microservice-provider-user2 is the default rule (polling)
Question: What if you want to move Configuration to another package?
define tags
package com.ldgx.eshop;
public @interface ExcludeFromComponent {
}
TestConfiguration class added
@ExcludeFromComponentStartup class added
@ComponentScan(excludeFilters = {@ComponentScan.Filter(type=FilterType.ANNOTATION, value=ExcludeFromComponent.class)})//Do not scan the class of the annotation ExcludeFromComponent annotation
16.4 Customizing the Ribbon Client using properties
application.yml, focus
NFLoadBalancerRuleClassName: load balancing algorithm
microservice-provider-user:
ribbon:
NFLoadBalancerRuleClassName: com.netflix.loadbalancer.RandomRule
The running results are as above, and it is concluded that microservice-provider-user adopts the random principle, and microservice-provider-user2 adopts the polling principle.
16.5 Using Ribbon with Eureka
in spring.application.name=microservice-provider-userde metadata
eureka.instance.metadata-map.zone=ABC #Metadata that eureka can understand eureka.instance.metadata-map.lilishow=BBC #will not affect the client's metadata
Enter the address in the browser http://localhost:8761/eureka/apps/microservice-provider-user
get
16.6 Example: How to Use Ribbon Without Eureka
ribbon:
eureka:
enabled: false #If there is eureka under the classpath, how to disable (Disable Eureka use in Ribbon)
microservice-provider-user:
ribbon:
listOfServers: localhost:7900
operation result
localhost,7900,microservice-provider-user localhost,7900,microservice-provider-user localhost,7900,microservice-provider-user localhost,7900,microservice-provider-user localhost,7900,microservice-provider-user localhost,7900,microservice-provider-user localhost,7900,microservice-provider-userAs a result, the ribbon load balancing is disabled, and only port 7900 is called