Using Apache Dubbo for RPC remote calls in Java API development

The wide application of Java in enterprise-level applications has brought great convenience to enterprises and developers. In recent years, with the rapid development of the Internet and mobile Internet, the scale of data processing and application deployment has also continued to expand, which has placed higher requirements on design and development. Therefore, remote procedure call (RPC) technology has also been widely used in Java development. This article will introduce the use of Apache Dubbo as an open source high-performance RPC framework in enterprise Java development.

Dubbo Introduction

Dubbo is a distributed service framework designed to improve application performance and scalability. Dubbo supports multiple protocols, such as HTTP, TCP and UDP-based Dubbo protocol. Dubbo introduced three key roles: Provider (service provider), Consumer (service consumer) and Registry (service registration center). Dubbo also has other roles such as Cluster (cluster fault tolerance), Monitor (statistics of service call times and call time), Router (routing strategy), and Protocol (service protocol).

Dubbo Features

• High performance: Dubbo adopts an excellent serialization method and an efficient NIO network communication mechanism, which can support batch transmission and greatly improve communication efficiency.
• Easy to use and deploy: Dubbo related modules are readily available and only require simple configuration to use.
• Shield multiple protocols: Dubbo can shield the underlying protocols, allowing developers to only focus on business logic implementation, improving the transparency of applications to protocols.
• High scalability: Many components in Dubbo use expansion mechanisms, such as the SPI expansion mechanism, which can customize and extend each component.

Use Dubbo to make remote service calls

Before using Dubbo to make RPC remote calls, you need to perform the following operations:

• Writing service interface
• Implementing services
• Publishing services

Dubbo officially provides a sample Demo. You only need to clone the code in GitHub and open it with IDEA to view it. Demo contains service interface and service implementation, service provider and consumer configuration files.

Next, let’s introduce how to use Dubbo to implement services.

1. Writing service interface

The first step is to design the service interface. In Dubbo, the service interface is called by consumers. A service interface usually has one or more methods. For example, suppose we write the following service interface:

public interface HelloService {
String sayHello(String name);
}

2. Implementing the service

In implementing the service, you need to implement all the methods defined in the interface, and encapsulate the implementation details of the provided service into the service provider, as shown below:

public class HelloServiceImpl implements HelloService {
@Override
public String sayHello(String name) {

return "Hello, " + name;

}
}

3. Publish Service

Next, we need Publish the implemented service. We need to register the service in the configuration center as follows:

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What key parameters do typical service providers need to use:

• interface: The name of the corresponding service interface.
• ref: The service provider requires this attribute to represent the service implementation associated with this service.
• version: version number.
• group: Group.
• timeout: call timeout.
• async: Whether it is asynchronous.
• connections: Maximum number of connections.
• actives: active number.

4. Using Dubbo to implement service calls

For developers, it is very simple to implement consumer calls to services exposed by Dubbo. First, you need to find the target service through the Dubbo framework, and then complete the relevant calls. The following is the scenario implemented in the sample Demo:

Register consumer:

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< ;property name="group" value="dubbo"/>
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We can inject the service directly into the class. The injection process is completed by Dubbo, as shown below:

public class HelloController {
@Autowired
private HelloService helloService;
}

Finally, we can directly use helloService to reference the service.

Summary

Apache Dubbo is a powerful distributed service framework that brings great convenience to Java development. In enterprise development, using Dubbo for RPC remote calls has become the choice of many developers. Through the introduction of this article, I hope that readers can better understand the advantages and usage of Dubbo, so that it can play a better role in actual development.

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