RocketMQ Filtersrv

最新推荐文章于 2024-03-15 12:26:10 发布

原创最新推荐文章于 2024-03-15 12:26:10 发布 · 254 阅读

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本文详细介绍了如何使用RocketMQ的Filtersrv特性进行消息过滤，通过示例代码展示了消费者如何订阅特定主题并应用自定义的消息过滤逻辑，同时涵盖了消息生产和消费的基本流程。

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RocketMQ Filtersrv详解

RocketMQ入门手册

import java.io.IOException;
import java.io.UnsupportedEncodingException;
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.client.exception.MQClientException;
import org.apache.rocketmq.common.MixAll;
import org.apache.rocketmq.common.message.MessageExt;


public class Consumer {

    public static void main(String[] args) throws InterruptedException, MQClientException, IOException {
    	
    	String group_name = "filter_consumer";
    	
        DefaultMQPushConsumer consumer = new DefaultMQPushConsumer(group_name);
        consumer.setNamesrvAddr("localhost:9876");
        
        String filterCode = MixAll.file2String("C:\\JavaEE_Workspace\\RocketMQ\\src\\main\\java\\com\\aztech\\filter\\MessageFilterImpl.java");
//        System.out.println("filterCode: " + filterCode);
        /**
         * 使用Java代码，在服务器做消息过滤
         */
        consumer.subscribe("TopicFilter7", MessageFilterImpl.class.getCanonicalName());
//        consumer.subscribe("TopicFilter7", "com.aztech.filter.MessageFilterImpl",filterCode);

        consumer.registerMessageListener(new MessageListenerConcurrently() {

            @Override
            public ConsumeConcurrentlyStatus consumeMessage(List<MessageExt> msgs,
                    ConsumeConcurrentlyContext context) {
                //System.out.println(Thread.currentThread().getName() + " Receive New Messages: " + msgs);
            	MessageExt me = msgs.get(0);
            	try {
					System.out.println("收到信息:" + new String(me.getBody(),"UTF-8"));
				} catch (UnsupportedEncodingException e) {
					e.printStackTrace();
				}
                return ConsumeConcurrentlyStatus.CONSUME_SUCCESS;
            }
        });

        /**
         * Consumer对象在使用之前必须要调用start初始化，初始化一次即可<br>
         */
        consumer.start();

        System.out.println("Consumer Started.");
    }
}

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;


public class Producer {
    public static void main(String[] args) throws MQClientException, InterruptedException {
    	
    	String group_name = "filter_producer";
        DefaultMQProducer producer = new DefaultMQProducer(group_name);
        
        producer.setNamesrvAddr("localhost:9876");
        producer.start();

        try {
            for (int i = 0; i < 10; i++) {
                Message msg = new Message("TopicFilter7",// topic
                    "TagA",// tag
                    "OrderID001",// key
                    ("Hello RocketMQ" + i).getBytes());// body

                msg.putUserProperty("SequenceId", String.valueOf(i));

                SendResult sendResult = producer.send(msg);
                System.out.println(sendResult);
            }
        }
        catch (Exception e) {
            e.printStackTrace();
        }

        producer.shutdown();
    }
}

import org.apache.rocketmq.common.filter.FilterContext;
import org.apache.rocketmq.common.filter.MessageFilter;
import org.apache.rocketmq.common.message.MessageExt;


public class MessageFilterImpl implements MessageFilter {

    @Override
    public boolean match(MessageExt msg, FilterContext arg1) {
    	// 尽量遵循规范,使用getUserProperty
        String property = msg.getUserProperty("SequenceId");
        if (property != null) {
            int id = Integer.parseInt(property);
            //if ((id % 3) == 0 && (id > 10)) {
            if ((id % 2) == 0) {
                return true;
            }
        }

        return false;
    }

}