Dubbo achieves service degradation, current limiting, and fusing, ensuring high availability and fault tolerance of services
1. Maven relies on class library coordinates:
<dependency>
<groupId>org.apache.dubbo</groupId>
<artifactId>dubbo-dependencies-zookeeper</artifactId>
<version>2.7.8</version>
<type>pom</type>
</dependency>
<dependency>
<groupId>org.apache.dubbo</groupId>
<artifactId>dubbo</artifactId>
<version>2.7.8</version>
</dependency>
<dependency>
<groupId>org.apache.dubbo</groupId>
<artifactId>dubbo-config-spring</artifactId>
<version>2.7.8</version>
</dependency>
<dependency>
<groupId>com.alibaba</groupId>
<artifactId>dubbo-go-remoting-api</artifactId>
<version>1.4.0</version>
</dependency>
<dependency>
<groupId>org.apache.curator</groupId>
<artifactId>curator-test</artifactId>
<version>4.0.1</version>
<scope>test</scope>
</dependency>
-Dubbo dependencies zookeeper: The ZooKeeper dependency library of the Dubbo framework, used for service registration and discovery.
-Dubbo: Dubbo core library, providing the core functions of the Dubbo framework.
-Dubbo config spring: Dubbo's Spring configuration support library provides integration support with Spring.
-Dubbo go remoting API: Dubbo's remote communication API library, providing functions related to Dubbo's remote communication.
-Curator test: A test library for Apache Curator, used to simulate ZooKeeper servers.
2. Examples of Dubbo service degradation, current limiting, and fuse failure (complete Java code):
import org.apache.dubbo.config.ApplicationConfig;
import org.apache.dubbo.config.ReferenceConfig;
import org.apache.dubbo.config.RegistryConfig;
import org.apache.dubbo.config.ServiceConfig;
public class DubboServiceExample {
public static void main(String[] args) {
//Current application configuration
ApplicationConfig application = new ApplicationConfig();
application.setName("dubbo-demo");
//Connection Registry Configuration
RegistryConfig registry = new RegistryConfig();
registry.setAddress("zookeeper://127.0.0.1:2181");
//Service Provider Configuration
ServiceConfig<DemoService> service = new ServiceConfig<>();
service.setApplication(application);
service.setRegistry(registry);
service.setInterface(DemoService.class);
service.setRef(new DemoServiceImpl());
service.export();
//Service Consumer Configuration
ReferenceConfig<DemoService> reference = new ReferenceConfig<>();
reference.setApplication(application);
reference.setRegistry(registry);
reference.setInterface(DemoService.class);
DemoService demoService = reference.get();
//Call Service Interface
String result = demoService.sayHello("Dubbo");
System.out.println(result);
}
}
public interface DemoService {
String sayHello(String name);
}
public class DemoServiceImpl implements DemoService {
@Override
public String sayHello(String name) {
return "Hello " + name;
}
}
3. Summary:
Dubbo is a high-performance distributed service framework that, through the introduction and configuration of dependency class libraries, can achieve fault tolerance and high availability functions such as service degradation, current limiting, and fusing. In the sample code, by configuring parameters such as Dubbo's application, registry, service provider, and service consumer, a simple Dubbo service can be provided and called. By utilizing Dubbo's service degradation, current limiting, and fusing features, system availability and fault tolerance can be better ensured.
