如何实现TDMQ中的Pulsar 广播，很多新手对此不是很清楚，为了帮助大家解决这个难题，下面小编将为大家详细讲解，有这方面需求的人可以来学习下，希望你能有所收获。
Pulsar订阅模型分类
Pulsar 支持的几种模式如下，依次是 独占模式 / 高可用模式 / 分享模式 / 基于键值 的分享模式。
Pulsar 广播模式
Pulsar 的订阅模式和很多 MQ 不太一样。比如 RabbitMQ/Kafka 等，一般消费端（Consumer）是直接去对接 Topic 的，然后 Consumer 自己又有个组的概念在配置中心去设置 offset，以此来决定是一起分享 Topic 的数据，还是每个人都接收同样的数据。在 Pulsar 的消费订阅模型里，添加了一个 Subscription 的逻辑，Subscription 的 Type 决定了消费是独享还是分享。
于是广播模式可以用不同 Subscription 独享的模式来实现，具体架构可以参照下图：
代码实现
1. Full-mesh 的形创建 Java 项目（比如：Springboot - 这个应该是相对简单的 IDE 集成开发组件）
画重点
介绍链接：https://cloud.tencent.com/document/product/1179/44914
<?xml version="1.0" encoding="UTF-8"?><project xmlns="http://maven.apache.org/POM/4.0.0"xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"xsi:schemaLocation="http://maven.apache.org/POM/4.0.0 https://maven.apache.org/xsd/maven-4.0.0.xsd"><modelVersion>4.0.0</modelVersion><parent><groupId>org.springframework.boot</groupId><artifactId>spring-boot-starter-parent</artifactId><version>2.4.3</version><relativePath /> <!-- lookup parent from repository --></parent><groupId>com.examble.demo</groupId><artifactId>tdmq-demo</artifactId><version>0.0.1-SNAPSHOT</version><name>tdmq-demo</name><description>demo project to test tdmq</description><properties><java.version>1.8</java.version></properties><dependencies><dependency><groupId>org.springframework.boot</groupId><artifactId>spring-boot-starter-web</artifactId></dependency><dependency><groupId>com.tencent.tdmq</groupId><artifactId>tdmq-client</artifactId><version>2.6.0</version></dependency><!-- https://mvnrepository.com/artifact/org.apache.pulsar/pulsar-client-api --><dependency><groupId>org.apache.pulsar</groupId><artifactId>pulsar-client-api</artifactId><version>2.6.0</version></dependency><dependency><groupId>org.springframework.boot</groupId><artifactId>spring-boot-starter-test</artifactId><scope>test</scope></dependency></dependencies><build><plugins><plugin><groupId>org.springframework.boot</groupId><artifactId>spring-boot-maven-plugin</artifactId></plugin></plugins></build></project>
2. 创建一个 Component 用来全局使用 Producer 和 Consumers
这里创建了1个 Producer 和3个拥有 exclusive subscription 的 consumers（广播模式 - 我们期待他们3个每次都收到一样的信息）
package com.example.demo.tdmq.instance;import javax.annotation.PostConstruct;import org.apache.pulsar.client.api.AuthenticationFactory;import org.apache.pulsar.client.api.Consumer;import org.apache.pulsar.client.api.Message;import org.apache.pulsar.client.api.MessageListener;import org.apache.pulsar.client.api.Producer;import org.apache.pulsar.client.api.PulsarClient;import org.apache.pulsar.client.api.PulsarClientException;import org.apache.pulsar.client.api.SubscriptionType;import org.springframework.beans.factory.config.ConfigurableBeanFactory;import org.springframework.context.annotation.Scope;import org.springframework.stereotype.Component;@Component@Scope(ConfigurableBeanFactory.SCOPE_SINGLETON)public class Global {PulsarClient client;public Producer<byte[]> producer;public Consumer<byte[]> consumer01;public Consumer<byte[]> consumer02;public Consumer<byte[]> consumer03;public Global() {}@PostConstructpublic void init() {try {client = PulsarClient.builder().serviceUrl("pulsar://<Your TDMQ Pulsar Service URL>:6000/").listenerName("custom:<TDMQ Pulsar Instance ID>/<TDMQ VPC ID>/<TDMQ Subnet ID>").authentication(AuthenticationFactory.token("<Your Credential Token from TDMQ>")).build();producer = client.newProducer().topic("persistent://<TDMQ Pulsar Instance ID>/<your name space>/<your topic>").create();consumer01 = client.newConsumer().subscriptionType(SubscriptionType.Exclusive).topic("persistent://<TDMQ Pulsar Instance ID>/<your name space>/<your topic>").messageListener(new MessageListener<byte[]>() {/****/private static final long serialVersionUID = 1L;@Overridepublic void received(Consumer<byte[]> consumer, Message<byte[]> msg) {System.out.println("Consumer01" + " - " + System.currentTimeMillis() + " - "+ new String(msg.getData()));try {consumer.acknowledge(msg);} catch (PulsarClientException e) {// TODO Auto-generated catch blocke.printStackTrace();}}}).subscriptionName("my-subscription01").subscribe();consumer02 = client.newConsumer().subscriptionType(SubscriptionType.Exclusive).topic("persistent://<TDMQ Pulsar Instance ID>/<your name space>/<your topic>").messageListener(new MessageListener<byte[]>() {/****/private static final long serialVersionUID = 1L;@Overridepublic void received(Consumer<byte[]> consumer, Message<byte[]> msg) {System.out.println("Consumer02" + " - " + System.currentTimeMillis() + " - "+ new String(msg.getData()));try {consumer.acknowledge(msg);} catch (PulsarClientException e) {// TODO Auto-generated catch blocke.printStackTrace();}}}).subscriptionName("my-subscription02").subscribe();consumer03 = client.newConsumer().subscriptionType(SubscriptionType.Exclusive).topic("persistent://<TDMQ Pulsar Instance ID>/<your name space>/<your topic>").messageListener(new MessageListener<byte[]>() {/****/private static final long serialVersionUID = 1L;@Overridepublic void received(Consumer<byte[]> consumer, Message<byte[]> msg) {System.out.println("Consumer03" + " - " + System.currentTimeMillis() + " - "+ new String(msg.getData()));try {consumer.acknowledge(msg);} catch (PulsarClientException e) {// TODO Auto-generated catch blocke.printStackTrace();}}}).subscriptionName("my-subscription03").subscribe();} catch (PulsarClientException e) {// TODO Auto-generated catch blocke.printStackTrace();}}}
3. 最外层的测试代码和简单的 Message 模型
public class MessageModel {private String messageText = null;public String getMessageText() {return messageText;}public void setMessageText(String messageText) {this.messageText = messageText;}}
跑起来测试一下，果然3个一起接收一样的消息
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