Pulsar源码解析-服务端-消费者创建的底层实现

最新推荐文章于 2024-04-03 09:49:53 发布

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最新推荐文章于 2024-04-03 09:49:53 发布 · 置顶 · 1.3k 阅读

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#java #分布式 #消息队列

本文深入解析Apache Pulsar服务端的消费者订阅创建过程，涉及权限校验、主题和订阅的创建、消费者实例管理以及消息分发机制。重点介绍了持久化订阅的创建，包括ManagedCursor和ManagedLedger在订阅中的作用。内容涵盖消费者服务端入口、订阅创建、权限验证、Topic与Subscription管理等多个关键步骤。

上一篇介绍的是消费者客户端的创建，本章解析服务端创建

一、消费者服务端创建入口

由于代码量较多，省略非重点

public class ServerCnx {
   
   

protected void handleSubscribe(final CommandSubscribe subscribe) {
   
   
		// 参数含义客户端消费者构造中都介绍过
        final long requestId = subscribe.getRequestId();
        final long consumerId = subscribe.getConsumerId();
        TopicName topicName = validateTopicName(subscribe.getTopic(), requestId, subscribe);
        final String subscriptionName = subscribe.getSubscription();
        final SubType subType = subscribe.getSubType();
        final String consumerName = subscribe.hasConsumerName() ? subscribe.getConsumerName() : "";
        final boolean isDurable = subscribe.isDurable();
        final MessageIdImpl startMessageId = subscribe.hasStartMessageId() ? new BatchMessageIdImpl(
                subscribe.getStartMessageId().getLedgerId(), subscribe.getStartMessageId().getEntryId(),
                subscribe.getStartMessageId().getPartition(), subscribe.getStartMessageId().getBatchIndex())
                : null;
        final int priorityLevel = subscribe.hasPriorityLevel() ? subscribe.getPriorityLevel() : 0;
        final boolean readCompacted = subscribe.hasReadCompacted() && subscribe.isReadCompacted();
        final Map<String, String> metadata = CommandUtils.metadataFromCommand(subscribe);
        final InitialPosition initialPosition = subscribe.getInitialPosition();
        final long startMessageRollbackDurationSec = subscribe.hasStartMessageRollbackDurationSec()
                ? subscribe.getStartMessageRollbackDurationSec()
                : -1;
        final SchemaData schema = subscribe.hasSchema() ? getSchema(subscribe.getSchema()) : null;
        final boolean isReplicated = subscribe.hasReplicateSubscriptionState()
                && subscribe.isReplicateSubscriptionState();
        final boolean forceTopicCreation = subscribe.isForceTopicCreation();
        final

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