RocketMQ支持根据用户自定义属性进行过滤,过滤表达式类似于SQL的where,如:a> 5 AND b ='abc'
consumerFilter.java
package com.woodie.rocketmq.filter;
import org.apache.rocketmq.client.consumer.DefaultMQPushConsumer;
import org.apache.rocketmq.client.consumer.MessageSelector;
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.message.MessageExt;
import java.io.UnsupportedEncodingException;
import java.util.List;
public class consumerFilter {
public static void main(String[] args) throws Exception {
DefaultMQPushConsumer consumer = new DefaultMQPushConsumer("woodie");
consumer.setNamesrvAddr("192.168.142.128:9876");
consumer.subscribe("my-topic-filter", MessageSelector.bySql("sex='F' AND age >= 18"));
consumer.registerMessageListener(new MessageListenerConcurrently() {
@Override
public ConsumeConcurrentlyStatus consumeMessage(List<MessageExt> msgs, ConsumeConcurrentlyContext context) {
try {
for (MessageExt msg: msgs) {
System.out.println("消息:" + new String (msg.getBody(), "UTF-8"));
}
} catch (UnsupportedEncodingException e) {
e.printStackTrace();
}
System.out.println("接收到的消息" + msgs);
// 返回消息是否消费成功
return ConsumeConcurrentlyStatus.CONSUME_SUCCESS;
}
});
consumer.start();
}
}
SyncProducer.java
package com.woodie.rocketmq.filter;
import org.apache.rocketmq.client.producer.DefaultMQProducer;
import org.apache.rocketmq.client.producer.SendResult;
import org.apache.rocketmq.common.message.Message;
public class SyncProducer {
public static void main(String[] args) throws Exception {
DefaultMQProducer producer = new DefaultMQProducer("woodie");
// 测试nameserver的地址
producer.setNamesrvAddr("192.168.142.128:9876");
// 启动生产者
producer.start();
String msg = "测试message设置参数在消费端获取";
// 生产者生产消息的时候设置tags,在这里可以通过设置不能的tags来获取对应的数据
// tags 设置*表示 所有换消息, 使用 || 表示获取多个
// Message message = new Message("my-topic", "add || update", msg.getBytes("UTF-8"));
Message message = new Message("my-topic-filter", "add", msg.getBytes("UTF-8"));
message.putUserProperty("sex", "F");
message.putUserProperty("age", "20");
SendResult sendResult = producer.send(message);
System.out.println("消息id:" + sendResult.getMsgId());
System.out.println("消息队列:" + sendResult.getMessageQueue());
System.out.println("消息偏移量:" + sendResult.getQueueOffset());
System.out.println(sendResult);
producer.shutdown();
}
}
测试如下