介绍
RocketMQ是阿里巴巴自研的第三代分布式消息中间件，是阿里系下开源的一款分布式、队列模型的消息中间件，原名Metaq，3.0 版本名称改为RocketMQ，是阿里参照kafka设计思想使用Java实现的一套MQ。同时将阿里系内部多款MQ产品（Notify、metaq）进行整合，只维护核心功能，去除了所有其他运行时依赖，保证核心功能最简化，在此基础上配合阿里上述其他开源产品实现不同场景下MQ的架构。
2016年11月，阿里将RocketMQ捐献给Apache软件基金会，正式成为孵化项目。阿里称会将其打造成*项目。
2017年2月20日，RocketMQ正式发布4.0版本，专家称新版本适用于电商领域，金融领域，大数据领域，兼有物联网领域的编程模型。
相关地址
- Git地址：https://github.com/apache/incubator-rocketmq
- 编译好的文件：https://rocketmq.incubator.apache.org/dowloading/releases/
- 快速入门：https://rocketmq.incubator.apache.org/docs/quick-start/
- 阿里的最新版本，支持windows：https://github.com/alibaba/RocketMQ/releases/download/v3.2.6/alibaba-rocketmq-3.2.6.tar.gz
小试牛刀
可通过自己下载源码编译或下载编译好的文件，地址见上。
假设是自己下载源码进行编译
下载源码并进行编译
> git clone https://github.com/apache/incubator-rocketmq.git
> cd incubator-rocketmq
> mvn clean package install -Prelease-all assembly:assembly -U
> cd target/apache-rocketmq-all/
Start Name Server
> nohup sh bin/mqnamesrv &
> tailf nohup.out
Start Broker
> nohup sh bin/mqbroker -n localhost:9876 &
> tailf nohup.out
注意如果这里启动失败，看一下内存是否足够，可以看一下“runbroker.sh”这个文件，对应的修改参数，如下
JAVA_OPT="-server -Xms4g -Xmx4g -Xmn2g -XX:PermSize=128m -XX:MaxPermSize=320m"
测试发送与接收
> export NAMESRV_ADDR=localhost:9876
> sh bin/tools.sh org.apache.rocketmq.example.quickstart.Producer
> sh bin/tools.sh org.apache.rocketmq.example.quickstart.Consumer
关闭服务
> sh bin/mqshutdown broker
> sh bin/mqshutdown namesrv
在Java项目中的使用
pom.xml
<properties>
<rocketmq_ver>4.0.0-incubating</rocketmq_ver>
</properties>
<dependencies>
<dependency>
<groupId>org.apache.rocketmq</groupId>
<artifactId>rocketmq-client</artifactId>
<version>${rocketmq_ver}</version>
</dependency>
</dependencies>
生产者
import org.apache.rocketmq.client.producer.DefaultMQProducer;
import org.apache.rocketmq.client.producer.SendResult;
import org.apache.rocketmq.common.message.Message;
public class Producer {
public static void main(String[] args) {
DefaultMQProducer producer = new DefaultMQProducer("Producer");
producer.setNamesrvAddr(Config.ADDR);
try {
producer.start();
Message msg = new Message("PushTopic", "push", "1", "Just for push1.".getBytes());
SendResult result = producer.send(msg);
System.out.println("id:" + result.getMsgId() + " result:" + result.getSendStatus());
msg = new Message("PushTopic", "push", "2", "Just for push2.".getBytes());
result = producer.send(msg);
System.out.println("id:" + result.getMsgId() + " result:" + result.getSendStatus());
msg = new Message("PushTopic", "pull", "1", "Just for pull.".getBytes());
result = producer.send(msg);
System.out.println("id:" + result.getMsgId() + " result:" + result.getSendStatus());
} catch (Exception e) {
e.printStackTrace();
} finally {
producer.shutdown();
}
}
}
消费者
import java.util.List;
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.common.consumer.ConsumeFromWhere;
import org.apache.rocketmq.common.message.Message;
import org.apache.rocketmq.common.message.MessageExt;
public class Consumer {
public static void main(String[] args) {
DefaultMQPushConsumer consumer =
new DefaultMQPushConsumer("PushConsumer");
consumer.setNamesrvAddr(Config.ADDR);
try {
//订阅PushTopic下Tag为push的消息
consumer.subscribe("PushTopic", "push");
/**
* 设置Consumer第一次启动是从队列头部开始消费还是队列尾部开始消费<br>
* 如果非第一次启动，那么按照上次消费的位置继续消费
*/
consumer.setConsumeFromWhere(
ConsumeFromWhere.CONSUME_FROM_FIRST_OFFSET);
consumer.registerMessageListener(
new MessageListenerConcurrently() {
public ConsumeConcurrentlyStatus consumeMessage(
List<MessageExt> msgs,
ConsumeConcurrentlyContext Context) {
for (Message msg : msgs) {
System.out.println(new String(msg.getBody()) + ":" + msg.toString());
}
return ConsumeConcurrentlyStatus.CONSUME_SUCCESS;
}
}
);
consumer.start();
} catch (Exception e) {
e.printStackTrace();
}
}
}
结果
id:C0A801663174723279CF77AF3C6E0000 result:SEND_OK
id:C0A801663174723279CF77AF3C7B0001 result:SEND_OK
id:C0A801663174723279CF77AF3C7D0002 result:SEND_OK
Just for push1.:MessageExt [queueId=2, storeSize=184, queueOffset=14, sysFlag=0, bornTimestamp=1490348772974, bornHost=/192.168.127.1:53238, storeTimestamp=1490348775615, storeHost=/192.168.127.128:10911, msgId=C0A87F8000002A9F000000000002EDE8, commitLogOffset=191976, bodyCRC=1396413800, reconsumeTimes=0, preparedTransactionOffset=0, toString()=Message [topic=PushTopic, flag=0, properties={MIN_OFFSET=0, MAX_OFFSET=15, KEYS=1, CONSUME_START_TIME=1490348782880, UNIQ_KEY=C0A801663174723279CF77AF3C6E0000, WAIT=true, TAGS=push}, body=15]]
Just for push2.:MessageExt [queueId=3, storeSize=184, queueOffset=14, sysFlag=0, bornTimestamp=1490348772987, bornHost=/192.168.127.1:53238, storeTimestamp=1490348775620, storeHost=/192.168.127.128:10911, msgId=C0A87F8000002A9F000000000002EEA0, commitLogOffset=192160, bodyCRC=2014758571, reconsumeTimes=0, preparedTransactionOffset=0, toString()=Message [topic=PushTopic, flag=0, properties={MIN_OFFSET=0, MAX_OFFSET=15, KEYS=2, CONSUME_START_TIME=1490348782882, UNIQ_KEY=C0A801663174723279CF77AF3C7B0001, WAIT=true, TAGS=push}, body=15]]