Gearman使用示例

最近的一個舊項目重構過程中，使用到了gearman這個開源項目，簡單來講，這是一個類似MQ的異步系統，一邊派發任務，一邊處理任務(有類似MQ中的消息發送方與接收方)，目前支持java，php等多種語言，缺點是存在單點問題（server的HA官方沒有提供方案，需要二次開發）。

官網地址：http://www.gearman.org

下面是java語言的示例：

注：gearman的java客戶端實例有好幾個版本，不同的版本之間相差巨大，建議使用官方推薦的最新版，地址為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、任務發送方(也稱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 菩提樹下的楊過 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、任務處理方(也稱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");
        }
    }
}