Gearman使用示例

最近的一个旧项目重构过程中，使用到了gearman这个开源项目，简单来讲，这是一个类似MQ的异步系统，一边派发任务，一边处理任务(有类似MQ中的消息发送方与接收方)，目前支持java，php等多种语言，缺点是存在单点问题（server的HA官方没有提供方案，需要二次开发）。

官网地址：http://www.gearman.org

下面是java语言的示例：

注：gearman的java客户端实例有好几个版本，不同的版本之间相差巨大，建议使用官方推荐的最新版，地址为https://github.com/gearman/java-service

一、spring配置

 <?xml version="1.0" encoding="UTF-8"?>

 <beans xmlns="http://www.springframework.org/schema/beans"

        xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"

        xsi:schemaLocation="http://www.springframework.org/schema/beans http://www.springframework.org/schema/beans/spring-beans.xsd">

     <bean id="gearmanImpl" class="org.gearman.impl.GearmanImpl"></bean>

     <bean id="gearmanServer" class="org.gearman.impl.server.remote.GearmanServerRemote">

         <constructor-arg index="0" ref="gearmanImpl"/>

         <constructor-arg index="1">

             <bean class="java.net.InetSocketAddress">

                 <constructor-arg index="0" value="localhost"/>

                 <constructor-arg index="1" value="4730"/>

             </bean>

         </constructor-arg>

     </bean>

     <bean id="gearmanClient" class="org.gearman.impl.client.ClientImpl">

         <constructor-arg index="0" ref="gearmanImpl"/>

     </bean>

     <bean id="gearmanWorker" class="org.gearman.impl.worker.GearmanWorkerImpl">

         <constructor-arg index="0" ref="gearmanImpl"/>

     </bean>

 </beans>

二、任务发送方(也称Client)

import org.gearman.GearmanJobEvent;

import org.gearman.GearmanJobReturn;

import org.gearman.GearmanServer;

import org.gearman.impl.client.ClientImpl;

import org.gearman.impl.server.remote.GearmanServerRemote;

import org.springframework.context.support.ClassPathXmlApplicationContext;

import java.io.UnsupportedEncodingException;

/**

 * Created by 菩提树下的杨过 on 6/12/16.

 */

public class DemoClient {

    public static void main(String[] args) throws InterruptedException, UnsupportedEncodingException {

        ClassPathXmlApplicationContext ctx = new ClassPathXmlApplicationContext("spring-gearman-test.xml");

        GearmanServer gearmanServer = ctx.getBean(GearmanServerRemote.class);

        ClientImpl client = ctx.getBean(ClientImpl.class);

        client.addServer(gearmanServer);

        client.submitBackgroundJob("demoTask", "jimmy1".getBytes());//asynchronous commit

        GearmanJobReturn jobReturn = client.submitJob("demoTask", "jimmy2".getBytes());//synchronous commit

        while (!jobReturn.isEOF()) {

            //next job event

            GearmanJobEvent event = jobReturn.poll();

            switch (event.getEventType()) {

                case GEARMAN_JOB_SUCCESS:     //job execute success

                    System.out.println(new String(event.getData(), "utf-8"));

                    break;

                case GEARMAN_SUBMIT_FAIL:     //job submit fail

                case GEARMAN_JOB_FAIL:        //job execute fail

                    System.err.println(event.getEventType() + ": "

                            + new String(event.getData(), "utf-8"));

                default:

            }

        }

        client.shutdown();

    }

}

三、任务处理方(也称Worker)

import org.gearman.GearmanFunction;

import org.gearman.GearmanFunctionCallback;

import org.gearman.GearmanServer;

import org.gearman.GearmanWorker;

import org.gearman.impl.server.remote.GearmanServerRemote;

import org.gearman.impl.worker.GearmanWorkerImpl;

import org.springframework.context.support.ClassPathXmlApplicationContext;

public class DemoWorker implements GearmanFunction {

    public static void main(String[] args) throws InterruptedException {

        ClassPathXmlApplicationContext ctx = new ClassPathXmlApplicationContext("spring-gearman-test.xml");

        GearmanServer gearmanServer = ctx.getBean(GearmanServerRemote.class);

        GearmanWorker worker = ctx.getBean(GearmanWorkerImpl.class);

        worker.addFunction("demoTask", new DemoWorker());

        worker.addServer(gearmanServer);

    }

    @Override

    public byte[] work(String function, byte[] data, GearmanFunctionCallback callback) throws Exception {

        if (data != null) {

            String param = new String(data);

            System.out.println("demoWorker => param :" + param);

            return ("return value：" + param).getBytes("utf-8");

        } else {

            return "not receive data!".getBytes("utf-8");

        }

    }

}

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Gearman使用示例

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