Pulsar と SpringBoot を統合する方法

1. pom.xml 依存関係の追加

<parent>
    <groupId>org.springframework.boot</groupId>
    <artifactId>spring-boot-starter-parent</artifactId>
    <version>2.7.0</version>
</parent>

<dependencies>
    <dependency>
        <groupId>org.springframework.boot</groupId>
        <artifactId>spring-boot-starter-web</artifactId>
    </dependency>

    <dependency>
        <groupId>org.apache.pulsar</groupId>
        <artifactId>pulsar-client</artifactId>
        <version>2.10.0</version>
    </dependency>

    <dependency>
        <groupId>org.projectlombok</groupId>
        <artifactId>lombok</artifactId>
        <version>1.18.24</version>
        <scope>provided</scope>
    </dependency>
</dependencies>

<build>
    <plugins>
        <plugin>
            <groupId>org.apache.maven.plugins</groupId>
            <artifactId>maven-compiler-plugin</artifactId>
            <configuration>
                <source>8</source>
                <target>8</target>
            </configuration>
        </plugin>
    </plugins>
</build>

2. Pulsar パラメーター クラス

import lombok.Data;
import org.springframework.boot.context.properties.ConfigurationProperties;
import org.springframework.stereotype.Component;

import java.util.Map;

/**
 * @Author: huangyibo
 * @Date: 2022/5/28 2:32
 * @Description: Pulsar 参数类
 */

@Component
@ConfigurationProperties(prefix = "tdmq.pulsar")
@Data
public class PulsarProperties {

    /**
     * 接入地址
     */
    private String serviceurl;

    /**
     * 命名空间tdc
     */
    private String tdcNamespace;

    /**
     * 角色tdc的token
     */
    private String tdcToken;

    /**
     * 集群name
     */
    private String cluster;

    /**
     * topicMap
     */
    private Map<String, String> topicMap;

    /**
     * 订阅
     */
    private Map<String, String> subMap;

    /**
     * 开关 on:Consumer可用 ||||| off:Consumer断路
     */
    private String onOff;
}

3. Pulsar 構成クラス

import org.apache.pulsar.client.api.AuthenticationFactory;
import org.apache.pulsar.client.api.PulsarClient;
import org.apache.pulsar.client.api.PulsarClientException;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.boot.context.properties.EnableConfigurationProperties;
import org.springframework.context.annotation.Bean;
import org.springframework.context.annotation.Configuration;

/**
 * @Author: huangyibo
 * @Date: 2022/5/28 2:33
 * @Description: Pulsar 配置类
 */

@Configuration
@EnableConfigurationProperties(PulsarProperties.class)
public class PulsarConfig {

    @Autowired
    PulsarProperties pulsarProperties;

    @Bean
    public PulsarClient getPulsarClient() {

        try {
            return PulsarClient.builder()
                    .authentication(AuthenticationFactory.token(pulsarProperties.getTdcToken()))
                    .serviceUrl(pulsarProperties.getServiceurl())
                    .build();
        } catch (PulsarClientException e) {
            System.out.println(e);
            throw new RuntimeException("初始化Pulsar Client失败");
        }
    }

}

4. さまざまな消費データ型のリスナー

import com.yibo.pulsar.pojo.User;
import org.apache.pulsar.client.api.Consumer;
import org.apache.pulsar.client.api.Message;
import org.apache.pulsar.client.api.MessageListener;
import org.springframework.stereotype.Component;

/**
 * @Author: huangyibo
 * @Date: 2022/5/28 2:37
 * @Description:
 */

@Component
public class UserMessageListener implements MessageListener<User> {

    @Override
    public void received(Consumer<User> consumer, Message<User> msg) {
        try {
            User user = msg.getValue();
            System.out.println(user);
            consumer.acknowledge(msg);
        } catch (Exception e) {
            consumer.negativeAcknowledge(msg);
        }
    }
}
import org.apache.pulsar.client.api.Consumer;
import org.apache.pulsar.client.api.Message;
import org.apache.pulsar.client.api.MessageListener;
import org.springframework.stereotype.Component;

/**
 * @Author: huangyibo
 * @Date: 2022/5/28 2:37
 * @Description:
 */

@Component
public class StringMessageListener implements MessageListener<String> {

    @Override
    public void received(Consumer<String> consumer, Message<String> msg) {
        try {
            System.out.println(msg.getValue());
            consumer.acknowledge(msg);
        } catch (Exception e) {
            consumer.negativeAcknowledge(msg);
        }
    }
}

5. Pulsar のコア サービス クラス

import com.yibo.pulsar.common.listener.StringMessageListener;
import com.yibo.pulsar.common.listener.UserMessageListener;
import com.yibo.pulsar.pojo.User;
import org.apache.pulsar.client.api.*;
import org.apache.pulsar.client.impl.schema.AvroSchema;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.context.annotation.Bean;
import org.springframework.stereotype.Component;

import java.util.concurrent.TimeUnit;

/**
 * @Author: huangyibo
 * @Date: 2022/5/28 2:35
 * @Description: Pulsar的核心服务类
 */

@Component
public class PulsarCommon {

    @Autowired
    private PulsarProperties pulsarProperties;

    @Autowired
    private PulsarClient client;

    @Autowired
    private UserMessageListener userMessageListener;

    @Autowired
    private StringMessageListener stringMessageListener;


    /**
     * 创建一个生产者 
     * @param topic     topic name
     * @param schema    schema方式
     * @param <T>       泛型
     * @return          Producer生产者
     */
    public <T> Producer<T> createProducer(String topic, Schema<T> schema) {

        try {
            return client.newProducer(schema)
                    .topic(pulsarProperties.getCluster() + "/" + pulsarProperties.getTdcNamespace() + "/" + topic)
                    .batchingMaxPublishDelay(10, TimeUnit.MILLISECONDS)
                    .sendTimeout(10, TimeUnit.SECONDS)
                    .blockIfQueueFull(true)
                    .create();
        } catch (PulsarClientException e) {
            throw new RuntimeException("初始化Pulsar Producer失败");
        }
    }


    /**
     * 
     * @param topic             topic name
     * @param subscription      sub name
     * @param messageListener   MessageListener的自定义实现类
     * @param schema            schema消费方式
     * @param <T>               泛型
     * @return                  Consumer消费者
     */
    public <T> Consumer<T> createConsumer(String topic, String subscription,
                                   MessageListener<T> messageListener, Schema<T> schema) {
        try {
            return client.newConsumer(schema)
                    .topic(pulsarProperties.getCluster() + "/" + pulsarProperties.getTdcNamespace() + "/" + topic)
                    .subscriptionName(subscription)
                    .ackTimeout(10, TimeUnit.SECONDS)
                    .subscriptionType(SubscriptionType.Shared)
                    .messageListener(messageListener)
                    .subscribe();
        } catch (PulsarClientException e) {
            throw new RuntimeException("初始化Pulsar Consumer失败");
        }
    }

    
    /**
     * 异步发送一条消息
     * @param message       消息体
     * @param producer      生产者实例
     * @param <T>           消息泛型
     */
    public <T> void sendAsyncMessage(T message, Producer<T> producer) {
        producer.sendAsync(message).thenAccept(msgId -> {
        });
    }
    
    
    /**
     * 同步发送一条消息
     * @param message       消息体
     * @param producer      生产者实例
     * @param <T>           泛型
     * @throws PulsarClientException
     */
    public <T> void sendSyncMessage(T message, Producer<T> producer) throws PulsarClientException {
        MessageId send = producer.send(message);
        System.out.println();
        System.out.println();
        System.out.println();
        System.out.println();
        System.out.println(send);
    }

    
    //-----------consumer-----------
    @Bean(name = "comment-publish-topic-consumer")
    public Consumer<String> getCommentPublishTopicConsumer() {
        return this.createConsumer(pulsarProperties.getTopicMap().get("comment-publish-topic"),
                pulsarProperties.getSubMap().get("comment-publish-topic-test"),
                stringMessageListener, Schema.STRING);
    }


    @Bean(name = "reply-publish-topic-consumer")
    public Consumer<User> getReplyPublishTopicConsumer() {
        return this.createConsumer(pulsarProperties.getTopicMap().get("reply-publish-topic"),
                pulsarProperties.getSubMap().get("reply-publish-topic-test"),
                userMessageListener, AvroSchema.of(User.class));
    }


    //-----------producer-----------
    @Bean(name = "comment-publish-topic-producer")
    public Producer<String> getCommentPublishTopicProducer() {
        return this.createProducer(pulsarProperties.getTopicMap().get("comment-publish-topic"),Schema.STRING);
    }


    @Bean(name = "reply-publish-topic-producer")
    public Producer<User> getReplyPublishTopicProducer() {
        return this.createProducer(pulsarProperties.getTopicMap().get("reply-publish-topic"), AvroSchema.of(User.class));
    }
}

6. Pulsar は Spring Cloud を統合

その後、上記のコードが BUG を引き起こすことが判明しました-> Nacos を更新した後
調査の結果、@RefreshScope アノテーションが原因であることが判明しました。このアノテーションにより Bean が破棄されます。PulsarConsumer とプロデューサーの両方が破棄されます。これは、プロデューサーが破棄されることを意味するだけです。次の呼び出しで再起動を完了しますが、呼び出しがないためコンシューマーを再起動できません。どうすれば解決しますか?

コンテナを更新するために一連のイベントを発行する必要があります

import lombok.extern.slf4j.Slf4j;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.context.ApplicationContext;
import org.springframework.context.ApplicationEvent;
import org.springframework.context.ApplicationListener;
import org.springframework.stereotype.Component;

/**
 * @Author: huangyibo
 * @Date: 2022/5/28 2:34
 * @Description:
 */

@Component
@Slf4j
public class RefreshPulsarListener implements ApplicationListener {

    @Autowired
    ApplicationContext applicationContext;

    @Override
    public void onApplicationEvent(ApplicationEvent event) {

        if (event.getSource().equals("__refreshAll__")) {
            log.info("Nacos配置中心配置修改 重启Pulsar====================================");
            log.info("重启PulsarClient,{}", applicationContext.getBean("getPulsarClient"));
            log.info("重启PulsarConsumer,{}", applicationContext.getBean("comment-publish-topic-consumer"));
            log.info("重启PulsarConsumer,{}", applicationContext.getBean("reply-publish-topic-consumer"));
        }
    }

}

以上がPulsar と SpringBoot を統合する方法の詳細内容です。詳細については、PHP 中国語 Web サイトの他の関連記事を参照してください。