Motan

![Maven Central](https://img.shields.io/maven-central/v/com.weibo/motan.svg?label=Maven Central)

Overview

Motan is a remote procedure call(RPC) framework for rapid development of high performance distributed services.

Features

Create distributed services without writing extra code.
Provides cluster support and integrate with popular service discovery services like Consul or Zookeeper.
Supports advanced scheduling features like weighted load-balance, scheduling cross IDCs, etc.
Optimization for high load scenarios, provides high availability in production environment.
Supports both synchronous and asynchronous calls.

Quick Start

The quick start gives very basic example of running client and server on the same machine. For the detailed information about using and developing Motan, please jump to Documents.

The minimum requirements to run the quick start are:

JDK 1.7 or above

A java-based project management software like Maven or Gradle

Synchronous calls

Add dependencies to pom.

 <dependency>
     <groupId>com.weibo</groupId>
     <artifactId>motan-core</artifactId>
     <version>0.3.0</version>
 </dependency>
 <dependency>
     <groupId>com.weibo</groupId>
     <artifactId>motan-transport-netty</artifactId>
     <version>0.3.0</version>
 </dependency>
 
 <!-- dependencies blow were only needed for spring-based features -->
 <dependency>
     <groupId>com.weibo</groupId>
     <artifactId>motan-springsupport</artifactId>
     <version>0.3.0</version>
 </dependency>
 <dependency>
     <groupId>org.springframework</groupId>
     <artifactId>spring-context</artifactId>
     <version>4.2.4.RELEASE</version>
 </dependency>

Create an interface for both service provider and consumer.

src/main/java/quickstart/FooService.java

package quickstart;

public interface FooService {
    public String hello(String name);
}

Write an implementation, create and start RPC Server.

src/main/java/quickstart/FooServiceImpl.java

package quickstart;

public class FooServiceImpl implements FooService {

	public String hello(String name) {
        System.out.println(name + " invoked rpc service");
        return "hello " + name;
	}
}

src/main/resources/motan_server.xml

<?xml version="1.0" encoding="UTF-8"?>
<beans xmlns="http://www.springframework.org/schema/beans"
	xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
	xmlns:motan="http://api.weibo.com/schema/motan"
	xsi:schemaLocation="http://www.springframework.org/schema/beans http://www.springframework.org/schema/beans/spring-beans-2.5.xsd
   http://api.weibo.com/schema/motan http://api.weibo.com/schema/motan.xsd">

    <!-- service implemention bean -->
    <bean id="serviceImpl" class="quickstart.FooServiceImpl" />
    <!-- exporting service by motan -->
    <motan:service interface="quickstart.FooService" ref="serviceImpl" export="8002" />
</beans>

src/main/java/quickstart/Server.java

package quickstart;

import org.springframework.context.ApplicationContext;
import org.springframework.context.support.ClassPathXmlApplicationContext;

public class Server {

    public static void main(String[] args) throws InterruptedException {
        ApplicationContext applicationContext = new ClassPathXmlApplicationContext("classpath:motan_server.xml");
        System.out.println("server start...");
    }
}

Execute main function in Server will start a motan server listening on port 8002.

Create and start RPC Client.

src/main/resources/motan_client.xml

<?xml version="1.0" encoding="UTF-8"?>
<beans xmlns="http://www.springframework.org/schema/beans"
xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
xmlns:motan="http://api.weibo.com/schema/motan"
xsi:schemaLocation="http://www.springframework.org/schema/beans http://www.springframework.org/schema/beans/spring-beans-2.5.xsd
   http://api.weibo.com/schema/motan http://api.weibo.com/schema/motan.xsd">

    <!-- reference to the remote service -->
    <motan:referer id="remoteService" interface="quickstart.FooService" directUrl="localhost:8002"/>
</beans>

src/main/java/quickstart/Client.java

package quickstart;

import org.springframework.context.ApplicationContext;
import org.springframework.context.support.ClassPathXmlApplicationContext;


public class Client {

    public static void main(String[] args) throws InterruptedException {
        ApplicationContext ctx = new ClassPathXmlApplicationContext("classpath:motan_client.xml");
        FooService service = (FooService) ctx.getBean("remoteService");
        System.out.println(service.hello("motan"));
    }
}

Execute main function in Client will invoke the remote service and print response.

Asynchronous calls

Based on the Synchronous calls example, add @MotanAsync annotation to interface FooService.

package quickstart;
import com.weibo.api.motan.transport.async.MotanAsync;

@MotanAsync
public interface FooService {
    public String hello(String name);
}

Include the plugin into the POM file to set target/generated-sources/annotations/ as source folder.

<plugin>
    <groupId>org.codehaus.mojo</groupId>
    <artifactId>build-helper-maven-plugin</artifactId>
    <version>1.10</version>
    <executions>
        <execution>
            <phase>generate-sources</phase>
            <goals>
                <goal>add-source</goal>
            </goals>
            <configuration>
                <sources>
                    <source>${project.build.directory}/generated-sources/annotations</source>
                </sources>
            </configuration>
        </execution>
    </executions>
</plugin>

Modify referer's attribute interface in motan_client.xml from FooService to FooServiceAsync.

<motan:referer id="remoteService" interface="quickstart.FooServiceAsync" directUrl="localhost:8002"/>

Start asynchronous calls.

public static void main(String[] args) {
    ApplicationContext ctx = new ClassPathXmlApplicationContext(new String[] {"classpath:motan_client.xml"});

    FooServiceAsync service = (FooServiceAsync) ctx.getBean("remoteService");

    // sync call
    System.out.println(service.hello("motan"));

    // async call
    ResponseFuture future = service.helloAsync("motan async ");
    System.out.println(future.getValue());

    // multi call
    ResponseFuture future1 = service.helloAsync("motan async multi-1");
    ResponseFuture future2 = service.helloAsync("motan async multi-2");
    System.out.println(future1.getValue() + ", " + future2.getValue());

    // async with listener
    FutureListener listener = new FutureListener() {
        @Override
        public void operationComplete(Future future) throws Exception {
            System.out.println("async call "
                    + (future.isSuccess() ? "sucess! value:" + future.getValue() : "fail! exception:"
                            + future.getException().getMessage()));
        }
    };
    ResponseFuture future3 = service.helloAsync("motan async multi-1");
    ResponseFuture future4 = service.helloAsync("motan async multi-2");
    future3.addListener(listener);
    future4.addListener(listener);
}

Documents

Contributors

maijunsheng(@maijunsheng)
fishermen(@hustfisher)
TangFulin(@tangfl)
bodlyzheng(@bodlyzheng)
jacawang(@jacawang)
zenglingshu(@zenglingshu)
Sugar Zouliu(@lamusicoscos)
tangyang(@tangyang)
olivererwang(@olivererwang)
jackael(@jackael9856)
Ray(@rayzhang0603)
r2dx(@half-dead)
Jake Zhang(sunnights)
axb(@qdaxb)
wenqisun(@wenqisun)
fingki(@fingki)
午夜(@sumory)
guanly(@guanly)
Di Tang(@tangdi)
肥佬大(@feilaoda)
小马哥(@andot)
wu-sheng(@wu-sheng) Assist Motan to become the first Chinese RPC framework on OpenTracing Supported Frameworks List

License

Motan is released under the Apache License 2.0.

thermosym/motan