Apache Dubbo (incubating) Project

Apache Dubbo (incubating) 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/incubator-dubbo-samples.git
# cd incubator-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>2.7.0</dubbo.version>
</properties>
    
<dependencyManagement>
    <dependencies>
        <dependency>
            <groupId>org.apache.dubbo</groupId>
            <artifactId>dubbo-dependencies-bom</artifactId>
            <version>${dubbo.version}</version>
            <type>pom</type>
            <scope>import</scope>
        </dependency>
    </dependencies>
</dependencyManagement>

<dependencies>
    <dependency>
        <groupId>org.apache.dubbo</groupId>
        <artifactId>dubbo</artifactId>
        <version>${dubbo.version}</version>
    </dependency>
    <dependency>
        <groupId>io.netty</groupId>
        <artifactId>netty-all</artifactId>
    </dependency>
    <dependency>
        <groupId>org.apache.curator</groupId>
        <artifactId>curator-framework</artifactId>
    </dependency>
    <dependency>
        <groupId>org.apache.curator</groupId>
        <artifactId>curator-recipes</artifactId>
    </dependency>
    <dependency>
        <groupId>org.apache.zookeeper</groupId>
        <artifactId>zookeeper</artifactId>
    </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.GreetingService;
 
public class GreetingServiceImpl implements GreetingService {
    public String sayHello(String name) {
        return "Hello " + name;
    }
}

See provider/GreetingServiceImpl.java on GitHub.

Start service provider

package org.apache.dubbo.demo.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.GreetingService;

import java.io.IOException;
 
public class Application {

    public static void main(String[] args) throws IOException {
        ServiceConfig<GreetingService> serviceConfig = new ServiceConfig<GreetingService>();
        serviceConfig.setApplication(new ApplicationConfig("first-dubbo-provider"));
        serviceConfig.setRegistry(new RegistryConfig("multicast://224.5.6.7:1234"));
        serviceConfig.setInterface(GreetingService.class);
        serviceConfig.setRef(new GreetingServiceImpl());
        serviceConfig.export();
        System.in.read();
    }
}

See provider/Application.java on GitHub.

Build and run the provider

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

Call remote service in consumer

package org.apache.dubbo.demo.consumer;

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

public class Application {
    public static void main(String[] args) {
        ReferenceConfig<GreetingService> referenceConfig = new ReferenceConfig<GreetingService>();
        referenceConfig.setApplication(new ApplicationConfig("first-dubbo-consumer"));
        referenceConfig.setRegistry(new RegistryConfig("multicast://224.5.6.7:1234"));
        referenceConfig.setInterface(GreetingService.class);
        GreetingService greetingService = referenceConfig.get();
        System.out.println(greetingService.sayHello("world"));
    }
}

Build and run the consumer

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

The consumer will print out Hello world on the screen.

See consumer/Application.java on GitHub.

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.

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-ops/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.incubator.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 (incubating) official website
Dubbo Samples - samples for Apache Dubbo (incubating)
Dubbo Spring Boot - Spring Boot Project for Dubbo
Dubbo OPS - The reference implementation for Dubbo admin

Language

License

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

linhuaichuan/incubator-dubbo