Apache Dubbo Project

Apache Dubbo is a high-performance, Java based open source RPC framework. Please visit official site for quick start and documentations, as well as Wiki for news, FAQ, and release notes.

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Architecture

Features

• Transparent interface based RPC
• Intelligent load balancing
• Automatic service registration and discovery
• High extensibility
• Runtime traffic routing
• Visualized service governance

Getting started

The following code snippet comes from Dubbo Samples. You may clone the sample project and step into dubbo-samples-api sub directory before read on.

# git clone https://github.com/apache/dubbo-samples.git
# cd dubbo-samples/dubbo-samples-api

There's a README file under dubbo-samples-api directory. Read it and try this sample out by following the instructions.

Maven dependency

<properties>
    <dubbo.version>2.7.3</dubbo.version>
</properties>
    
<dependencies>
    <dependency>
        <groupId>org.apache.dubbo</groupId>
        <artifactId>dubbo</artifactId>
        <version>${dubbo.version}</version>
    </dependency>
    <dependency>
        <groupId>org.apache.dubbo</groupId>
        <artifactId>dubbo-dependencies-zookeeper</artifactId>
        <version>${dubbo.version}</version>
        <type>pom</type>
    </dependency>
</dependencies>

Define service interfaces

package org.apache.dubbo.samples.api;

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

See api/GreetingService.java on GitHub.

Implement service interface for the provider

package org.apache.dubbo.samples.provider;

import org.apache.dubbo.samples.api.GreetingsService;

public class GreetingsServiceImpl implements GreetingsService {
    @Override
    public String sayHi(String name) {
        return "hi, " + name;
    }
}

See provider/GreetingServiceImpl.java on GitHub.

Start service provider

package org.apache.dubbo.samples.provider;


import org.apache.dubbo.config.ApplicationConfig;
import org.apache.dubbo.config.RegistryConfig;
import org.apache.dubbo.config.ServiceConfig;
import org.apache.dubbo.samples.api.GreetingsService;

import java.util.concurrent.CountDownLatch;

public class Application {
    private static String zookeeperHost = System.getProperty("zookeeper.address", "127.0.0.1");

    public static void main(String[] args) throws Exception {
        ServiceConfig<GreetingsService> service = new ServiceConfig<>();
        service.setApplication(new ApplicationConfig("first-dubbo-provider"));
        service.setRegistry(new RegistryConfig("zookeeper://" + zookeeperHost + ":2181"));
        service.setInterface(GreetingsService.class);
        service.setRef(new GreetingsServiceImpl());
        service.export();

        System.out.println("dubbo service started");
        new CountDownLatch(1).await();
    }
}

See provider/Application.java on GitHub.

Build and run the provider

# mvn clean package
# mvn -Djava.net.preferIPv4Stack=true -Dexec.mainClass=org.apache.dubbo.samples.provider.Application exec:java

Call remote service in consumer

package org.apache.dubbo.samples.client;


import org.apache.dubbo.config.ApplicationConfig;
import org.apache.dubbo.config.ReferenceConfig;
import org.apache.dubbo.config.RegistryConfig;
import org.apache.dubbo.samples.api.GreetingsService;

public class Application {
    private static String zookeeperHost = System.getProperty("zookeeper.address", "127.0.0.1");

    public static void main(String[] args) {
        ReferenceConfig<GreetingsService> reference = new ReferenceConfig<>();
        reference.setApplication(new ApplicationConfig("first-dubbo-consumer"));
        reference.setRegistry(new RegistryConfig("zookeeper://" + zookeeperHost + ":2181"));
        reference.setInterface(GreetingsService.class);
        GreetingsService service = reference.get();
        String message = service.sayHi("dubbo");
        System.out.println(message);
    }
}

See consumer/Application.java on GitHub.

Build and run the consumer

# mvn clean package
# mvn -Djava.net.preferIPv4Stack=true -Dexec.mainClass=org.apache.dubbo.samples.client.Application exec:java

The consumer will print out hi, dubbo on the screen.

Next steps

• Your first Dubbo application - A 101 tutorial to reveal more details, with the same code above.
• Dubbo user manual - How to use Dubbo and all its features.
• Dubbo developer guide - How to involve in Dubbo development.
• Dubbo admin manual - How to admin and manage Dubbo services.

Building

If you want to try out the cutting-edge features, you can build with the following commands. (Java 1.8 is required to build the master branch)

  mvn clean install

Contact

• Mailing list:

  • dev list: for dev/user discussion. subscribe, unsubscribe, archive, guide

• Bugs: Issues

• Gitter: Gitter channel

• Twitter: @ApacheDubbo

Contributing

See CONTRIBUTING for details on submitting patches and the contribution workflow.

How can I contribute?

• Take a look at issues with tag called Good first issue or Help wanted.
• Join the discussion on mailing list, subscription guide.
• Answer questions on issues.
• Fix bugs reported on issues, and send us pull request.
• Review the existing pull request.
• Improve the website, typically we need
  • blog post
  • translation on documentation
  • use cases about how Dubbo is being used in enterprise system.
• Improve the dubbo-admin/dubbo-monitor.
• Contribute to the projects listed in ecosystem.
• Any form of contribution that is not mentioned above.
• If you would like to contribute, please send an email to dev@dubbo.apache.org to let us know!

Reporting bugs

Please follow the template for reporting any issues.

Reporting a security vulnerability

Please report security vulnerability to us privately.

Dubbo ecosystem

• Dubbo Ecosystem Entry - A GitHub group dubbo to gather all Dubbo relevant projects not appropriate in apache group yet
• Dubbo Website - Apache Dubbo official website
• Dubbo Samples - samples for Apache Dubbo
• Dubbo Spring Boot - Spring Boot Project for Dubbo
• Dubbo Admin - The reference implementation for Dubbo admin

Language

• Node.js
• Python
• PHP
• Go
• Erlang

License

Apache Dubbo is under the Apache 2.0 license. See the LICENSE file for details.