springboot集成Pulsar,生产者与消费者示例代码

一、导入pulsar依赖

<dependency>
    <groupId>org.apache.pulsar</groupId>
    <artifactId>pulsar-client</artifactId>
    <version>2.9.2</version>
</dependency>

二、pulsar配置(示例为yml文件)

# pulsar配置
pulsar:
  # pulsar服务端地址
  url: pulsar://192.168.0.1:30000
  # 多个topic以逗号分隔
  topic: topic1,topic2
  # 消费者组
  subscription: topicGroup

三、生产者示例代码

@Component
public class TestPulsarProducer {
    
    
 
    private static final Logger log = LoggerFactory.getLogger(TestPulsarProducer.class);
 
    @Value("${pulsar.url}")
    private String url;
    @Value("${pulsar.topic}")
    private String topic;
 
    PulsarClient client = null;
    Producer<byte[]> producer = null;
 
    @PostConstruct
    public void initPulsar() throws Exception{
    
    
        //构造Pulsar client
        client = PulsarClient.builder()
                .serviceUrl(url)
                .build();
 
        //创建producer
        producer = client.newProducer()
                .topic(topic.split(",")[0])
                .enableBatching(true)//是否开启批量处理消息,默认true,需要注意的是enableBatching只在异步发送sendAsync生效,同步发送send失效。因此建议生产环境若想使用批处理,则需使用异步发送,或者多线程同步发送
                .compressionType(CompressionType.LZ4)//消息压缩(四种压缩方式:LZ4,ZLIB,ZSTD,SNAPPY),consumer端不用做改动就能消费,开启后大约可以降低3/4带宽消耗和存储(官方测试)
                .batchingMaxPublishDelay(10, TimeUnit.MILLISECONDS) //设置将对发送的消息进行批处理的时间段,10ms;可以理解为若该时间段内批处理成功,则一个batch中的消息数量不会被该参数所影响。
                .sendTimeout(0, TimeUnit.SECONDS)//设置发送超时0s;如果在sendTimeout过期之前服务器没有确认消息,则会发生错误。默认30s,设置为0代表无限制,建议配置为0
                .batchingMaxMessages(1000)//批处理中允许的最大消息数。默认1000
                .maxPendingMessages(1000)//设置等待接受来自broker确认消息的队列的最大大小,默认1000
                .blockIfQueueFull(true)//设置当消息队列中等待的消息已满时,Producer.send 和 Producer.sendAsync 是否应该block阻塞。默认为false,达到maxPendingMessages后send操作会报错,设置为true后,send操作阻塞但是不报错。建议设置为true
                .roundRobinRouterBatchingPartitionSwitchFrequency(10)//向不同partition分发消息的切换频率,默认10ms,可根据batch情况灵活调整
                .batcherBuilder(BatcherBuilder.DEFAULT)//key_Shared模式要用KEY_BASED,才能保证同一个key的message在一个batch里
                .create();
 
    }
 
    public void sendMsg(String key, String data){
    
    
        CompletableFuture<MessageId> future = producer.newMessage()
                .key(key)
                .value(data.getBytes()).sendAsync();//异步发送
        future.handle((v, ex) -> {
    
    
            if (ex == null) {
    
    
                log.info("Message persisted2: {}", data);
            } else {
    
    
                log.error("发送Pulsar消息失败msg:【{}】 ", data, ex);
            }
            return null;
        });
        // future.join();
        log.info("Message persisted: {}", data);
    }
 
}

四、消费者代码

@Component
public class AlarmPulsarConsumer {
    
    
 
    private static final Logger log = LoggerFactory.getLogger(AlarmPulsarConsumer.class);
 
    @Value("${pulsar.url}")
    private String url;
    @Value("${pulsar.topic}")
    private String topic;
    @Value("${pulsar.subscription}")
    private String subscription;
 
 
    private PulsarClient client = null;
    private Consumer consumer = null;
 
    /**
     * 使用@PostConstruct注解用于在依赖关系注入完成之后需要执行的方法上,以执行任何初始化
     */
    @PostConstruct
    public void initPulsar() throws Exception{
    
    
        try{
    
    
            //构造Pulsar client
            client = PulsarClient.builder()
                    .serviceUrl(url)
                    .build();
 
            //创建consumer
            consumer = client.newConsumer()
                    .topic(topic.split(","))
                    .subscriptionName(subscription)
                    .subscriptionType(SubscriptionType.Shared)//指定消费模式,包含:Exclusive,Failover,Shared,Key_Shared。默认Exclusive模式
                    .subscriptionInitialPosition(SubscriptionInitialPosition.Earliest)//指定从哪里开始消费还有Latest,valueof可选,默认Latest
                    .negativeAckRedeliveryDelay(60, TimeUnit.SECONDS)//指定消费失败后延迟多久broker重新发送消息给consumer,默认60s
                    .subscribe();
 
            // 开始消费
            new Thread(()->{
    
    
                AlarmPulsarConsumer alarmPulsarConsumer = SpringUtils.getBean(AlarmPulsarConsumer.class);
                try{
    
    
                    alarmPulsarConsumer.start();
                }catch(Exception e){
    
    
                    log.error("消费Pulsar数据异常,停止Pulsar连接:", e);
                    alarmPulsarConsumer.close();
                }
            }).start();
 
        }catch(Exception e){
    
    
            log.error("Pulsar初始化异常:",e);
            throw e;
        }
    }
 
    private void start() throws Exception{
    
    
        //消费消息
        while (true) {
    
    
            Message message = consumer.receive();
            String[] keyArr = message.getKey().split("_");
            String jsons = new String(message.getData());
          
            if (StringUtils.isNotEmpty(json)) {
    
    
                try{
    
    
                    wsSend(type, strategyId, camId, camTime, json,depId,alarmType,target);
                }catch(Exception e){
    
    
                    log.error("消费Pulsar数据异常,key【{}】,json【{}】:", message.getKey(), json, e);
                }
            }
            consumer.acknowledge(message);
        }
    }
 
    /**
     * 线程池异步处理Pulsar推送的数据
     *
     * @param camTime
     * @param type
     * @param camId
     * @param json
     */
//    @Async("threadPoolTaskExecutor")
    public void wsSend(Integer type, Integer strategyId, String camId, Long camTime, String json,Long depId,Integer alarmType,Integer target) {
    
    
       
    }
 
 
    public void close(){
    
    
        try {
    
    
            consumer.close();
        } catch (PulsarClientException e) {
    
    
            log.error("关闭Pulsar消费者失败:",e);
        }
        try {
    
    
            client.close();
        } catch (PulsarClientException e) {
    
    
            log.error("关闭Pulsar连接失败:",e);
        }
    }
 
}

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转载自blog.csdn.net/weixin_52799373/article/details/124222022
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