Motan

Overview

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

Related projects in Motan ecosystem:

• Motan-go is golang implementation.
• Motan-PHP is PHP client can interactive with Motan server directly or through Motan-go agent.
• Motan-openresty is a Lua(Luajit) implementation based on Openresty.

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.
• Support cross-language interactive with Golang, PHP, Lua(Luajit), etc.

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 1.8 or above
• A java-based project management software like Maven or Gradle

Synchronous calls

1. Add dependencies to pom.

<properties>
    <motan.version>1.1.12</motan.version> 
</properties>
<dependencies>
<dependency>
    <groupId>com.weibo</groupId>
    <artifactId>motan-core</artifactId>
    <version>${motan.version}</version>
</dependency>
<dependency>
    <groupId>com.weibo</groupId>
    <artifactId>motan-transport-netty</artifactId>
    <version>${motan.version}</version>
</dependency>


<dependency>
    <groupId>com.weibo</groupId>
    <artifactId>motan-springsupport</artifactId>
    <version>${motan.version}</version>
</dependency>
<dependency>
    <groupId>org.springframework</groupId>
    <artifactId>spring-context</artifactId>
    <version>4.2.4.RELEASE</version>
</dependency>
</dependencies>

1. Create an interface for both service provider and consumer.

src/main/java/quickstart/FooService.java

```java
package quickstart;

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

1. Write an implementation, create and start RPC Server.

src/main/java/quickstart/FooServiceImpl.java

```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
<?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">


    <bean id="serviceImpl" class="quickstart.FooServiceImpl" />

    <motan:service interface="quickstart.FooService" ref="serviceImpl" export="8002" />
</beans>
```

src/main/java/quickstart/Server.java

```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.

1. Create and start RPC Client.

src/main/resources/motan_client.xml

```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">


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

src/main/java/quickstart/Client.java

```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

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

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

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

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

   ```xml org.codehaus.mojo build-helper-maven-plugin 1.10 generate-sources add-source

${project.build.directory}/generated-sources/annotations

                </sources>
            </configuration>
        </execution>
    </executions>
</plugin>
```

1. Modify the attribute interface of referer in motan_client.xml from FooService to FooServiceAsync.

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

2. Start asynchronous calls.

   ```java 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() ? "success! 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

• Wiki
• Wiki(中文)

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
• Jin Zhang(@lowzj)
• xiaoqing.yuanfang(@xiaoqing-yuanfang)
• 东方上人(@dongfangshangren)
• Voyager3(@xxxxzr)
• yeluoguigen009(@yeluoguigen009)
• Michael Yang(@yangfuhai)
• Panying(@anylain)

License

Motan is released under the Apache License 2.0.