文章目录


RocketMQ-初体验RocketMQ(11)-过滤消息_自定义Java类筛选消息_RocketMQ基于Java类过滤消息


概述

RocketMQ-初体验RocketMQ(10)-过滤消息_SQL92表达式筛选消息 通过SQL92的方式,消费者可以过滤到自己想要的消息,其实RocketMQ还提供了一个更为抢到的功能,支持自定义Java类…

直接来看下如何使用的吧


集群信息

RocketMQ : V4.3.2

集群模式: 互为主备

RocketMQ-初体验RocketMQ(11)-过滤消息_自定义Java类筛选消息_java_02

节点信息: 192.168.18.130 192.168.18.131 双机互为主备

broker-m.conf 和 broker-s.conf 均已配置了 filterServerNums=1 ,已重启。


项目结构

RocketMQ-初体验RocketMQ(11)-过滤消息_自定义Java类筛选消息_sql_03

生产者

package com.artisan.rocketmq.filter;

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

/**
* @author 小工匠
* @version v1.0
* @create 2019-11-11 23:30
* @motto show me the code ,change the word
* @blog https://artisan.blog.csdn.net/
* @description
**/
public class FilterProducer {


/***
* TAG-FILTER-1000 ---> 布隆过滤器
* 过滤掉的那些消息。直接就跳过了么。下次就不会继续过滤这些了。是么。
* @param args
* @throws Exception
*/
public static void main(String[] args) throws Exception {
DefaultMQProducer producer = new DefaultMQProducer("filter_sample_group");
producer.setNamesrvAddr("192.168.18.130:9876;192.168.18.131:9876");
producer.start();

for (int i = 0; i < 3; i++) {
Message msg = new Message("TopicFilter",
"TAG-FILTER",
("Hello RocketMQ " + i).getBytes(RemotingHelper.DEFAULT_CHARSET)
);

// Set some properties. 生产者设置属性,消费者端通过Tag+该属性定制消息
msg.putUserProperty("a", String.valueOf(i));
if (i % 2 == 0) {
msg.putUserProperty("b", "artisan");
} else {
msg.putUserProperty("b", "smart artisan");
}
producer.send(msg);
}

producer.shutdown();
}

}

自定义类

/**
* Licensed to the Apache Software Foundation (ASF) under one or more
* contributor license agreements. See the NOTICE file distributed with
* this work for additional information regarding copyright ownership.
* The ASF licenses this file to You under the Apache License, Version 2.0
* (the "License"); you may not use this file except in compliance with
* the License. You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/

package com.artisan.rocketmq.filter;

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 context) {
String property = msg.getProperty("SequenceId");
if (property != null) {
int id = Integer.parseInt(property);
if (((id % 10) == 0) && (id > 100)) {
return true;
}
}
return false;
}
}

消费者

package com.artisan.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 org.apache.rocketmq.remoting.common.RemotingHelper;

import java.io.UnsupportedEncodingException;
import java.util.List;

/**
* @author 小工匠
* @version v1.0
* @create 2019-11-11 23:45
* @motto show me the code ,change the word
* @blog https://artisan.blog.csdn.net/
* @description
**/
public class FilterConsumer {

public static void main(String[] args) throws Exception {
DefaultMQPushConsumer consumer = new DefaultMQPushConsumer("filter_sample_group");
/**
* 注册中心
*/
consumer.setNamesrvAddr("192.168.18.130:9876;192.168.18.131:9876");
/**
* 订阅主题
* 一种资源去换取另外一种资源
*/
consumer.subscribe("TopicFilter", MessageSelector.bySql("a between 0 and 3 and b = 'artisan'"));
/**
* 注册监听器,监听主题消息
*/
consumer.registerMessageListener(new MessageListenerConcurrently() {
@Override
public ConsumeConcurrentlyStatus consumeMessage(List<MessageExt> msgs,
ConsumeConcurrentlyContext context) {
for (MessageExt msg : msgs){
try {
System.out.println("consumeThread=" + Thread.currentThread().getName()
+ ", queueId=" + msg.getQueueId() + ", content:"
+ new String(msg.getBody(), RemotingHelper.DEFAULT_CHARSET));
} catch (UnsupportedEncodingException e) {
e.printStackTrace();
}
}
return ConsumeConcurrentlyStatus.CONSUME_SUCCESS;
}
});
consumer.start();

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

测试结果

目前 没测试成功,先记录下。