rocketmq demo

首先下载rocketmq，启动需要指定rocketmq home目录

cd github

git clone -b develop https://github.com/apache/incubator-rocketmq.git

 

whatsmars-mq
  |-src
    |-main
      |-java
        |-com.itlong.whatsmars.mq.rocketmq.quickstart
	  BrokerStartup.java
	  Consumer.java
	  NamesrvStartup.java
	  Producer.java
      |-resource
        conf.properties
  pom.xml

 依赖：

 

 

<dependencies>
        <!-- https://mvnrepository.com/artifact/org.apache.rocketmq/rocketmq-namesrv -->
        <dependency>
            <groupId>org.apache.rocketmq</groupId>
            <artifactId>rocketmq-namesrv</artifactId>
            <version>4.0.0-incubating</version>
        </dependency>
        <!-- https://mvnrepository.com/artifact/org.apache.rocketmq/rocketmq-broker -->
        <dependency>
            <groupId>org.apache.rocketmq</groupId>
            <artifactId>rocketmq-broker</artifactId>
            <version>4.0.0-incubating</version>
        </dependency>
        <!-- https://mvnrepository.com/artifact/org.apache.rocketmq/rocketmq-client -->
        <dependency>
            <groupId>org.apache.rocketmq</groupId>
            <artifactId>rocketmq-client</artifactId>
            <version>4.0.0-incubating</version>
        </dependency>

    </dependencies>

 conf.properties

 

 

rocketmqHome=D:\\github\\incubator-rocketmq\\distribution
namesrvAddr=127.0.0.1:9876
mapedFileSizeCommitLog=52428800
mapedFileSizeConsumeQueue=30000

 类似于zookeeper的服务：

 

 

public class NamesrvStartup {

    public static void main(String[] args) {
        String classpath = BrokerStartup.class.getResource("/").getPath();
        args = new String[] {"-c", classpath + "conf.properties"};
        org.apache.rocketmq.namesrv.NamesrvStartup.main(args);
    }
}

 Broker:

 

 

public class BrokerStartup {

    public static void main(String[] args) {
        String classpath = BrokerStartup.class.getResource("/").getPath();
        args = new String[] {"-c", classpath + "conf.properties"};
        org.apache.rocketmq.broker.BrokerStartup.main(args);
        System.out.println("Broker started.");
    }
}

 Consumer:

 

 

package com.itlong.whatsmars.mq.rocketmq.quickstart;

import org.apache.rocketmq.client.consumer.DefaultMQPushConsumer;
import org.apache.rocketmq.client.consumer.listener.ConsumeConcurrentlyContext;
import org.apache.rocketmq.client.consumer.listener.ConsumeConcurrentlyStatus;
import org.apache.rocketmq.client.consumer.listener.MessageListenerConcurrently;
import org.apache.rocketmq.client.exception.MQClientException;
import org.apache.rocketmq.common.consumer.ConsumeFromWhere;
import org.apache.rocketmq.common.message.MessageExt;

import java.util.List;

/**
 * This example shows how to subscribe and consume messages using providing {@link DefaultMQPushConsumer}.
 */
public class Consumer {

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

        /*
         * Instantiate with specified consumer group name.
         */
        DefaultMQPushConsumer consumer = new DefaultMQPushConsumer("please_rename_unique_group_name_4");

        /*
         * Specify name server addresses.
         * <p/>
         *
         * Alternatively, you may specify name server addresses via exporting environmental variable: NAMESRV_ADDR
         * <pre>
         * {@code
         * consumer.setNamesrvAddr("name-server1-ip:9876;name-server2-ip:9876");
         * }
         * </pre>
         */
        consumer.setNamesrvAddr("127.0.0.1:9876");
        /*
         * Specify where to start in case the specified consumer group is a brand new one.
         */
        consumer.setConsumeFromWhere(ConsumeFromWhere.CONSUME_FROM_FIRST_OFFSET);

        /*
         * Subscribe one more more topics to consume.
         */
        consumer.subscribe("TopicTest", "*");

        /*
         *  Register callback to execute on arrival of messages fetched from brokers.
         */
        consumer.registerMessageListener(new MessageListenerConcurrently() {

            @Override
            public ConsumeConcurrentlyStatus consumeMessage(List<MessageExt> msgs,
                                                            ConsumeConcurrentlyContext context) {
                System.out.printf(Thread.currentThread().getName() + " Receive New Messages: " + msgs + "%n");
                return ConsumeConcurrentlyStatus.CONSUME_SUCCESS;
            }
        });

        /*
         *  Launch the consumer instance.
         */
        consumer.start();

        System.out.printf("Consumer Started.%n");
    }
}

 Producer:

 

 

package com.itlong.whatsmars.mq.rocketmq.quickstart;

import org.apache.rocketmq.client.exception.MQClientException;
import org.apache.rocketmq.client.producer.DefaultMQProducer;
import org.apache.rocketmq.client.producer.SendResult;
import org.apache.rocketmq.common.message.Message;
import org.apache.rocketmq.remoting.common.RemotingHelper;

/**
 * This class demonstrates how to send messages to brokers using provided {@link DefaultMQProducer}.
 */
public class Producer {
    public static void main(String[] args) throws MQClientException, InterruptedException {

        /*
         * Instantiate with a producer group name.
         */
        DefaultMQProducer producer = new DefaultMQProducer("please_rename_unique_group_name");

        /*
         * Specify name server addresses.
         * <p/>
         *
         * Alternatively, you may specify name server addresses via exporting environmental variable: NAMESRV_ADDR
         * <pre>
         * {@code
         * producer.setNamesrvAddr("name-server1-ip:9876;name-server2-ip:9876");
         * }
         * </pre>
         */
        producer.setNamesrvAddr("127.0.0.1:9876");

        /*
         * Launch the instance.
         */
        producer.start();

        for (int i = 0; i < 1000; i++) {
            try {

                /*
                 * Create a message instance, specifying topic, tag and message body.
                 */
                Message msg = new Message("TopicTest" /* Topic */,
                    "TagA" /* Tag */,
                    ("Hello RocketMQ " + i).getBytes(RemotingHelper.DEFAULT_CHARSET) /* Message body */
                );

                /*
                 * Call send message to deliver message to one of brokers.
                 */
                SendResult sendResult = producer.send(msg);

                System.out.printf("%s%n", sendResult);
            } catch (Exception e) {
                e.printStackTrace();
                Thread.sleep(1000);
            }
        }

        /*
         * Shut down once the producer instance is not longer in use.
         */
        producer.shutdown();
    }
}

 

 

conf.properties指定rocketmqHome,namesrvAddr等，依次启动NamesrvStartup,BrokerStartup,Consumer,Producer.

消息管理系统 https://github.com/javahongxi/whatsmars/tree/master/rocketmq-console

rocketmq原理与实践 http://wely.iteye.com/blog/2392089