Message-Driven，Event-Driven & Streaming 这三个词一定是近期消息领域高频词，但由于概念过于新，很多同学其实是不太理解这里的异同。正好有个间隙做产品调研，索性把三个概念重新梳理下讲给大家。
- Event- Driven（事件驱动的通信）
- 订阅过滤：是否拥有根据 Tag或其他字段做订阅过滤的能力
- At – least -once（最少交付一次），at-most-once（最多交付一次），exactly-once （精确交付）。
消息驱动模式下通常会用到中间件，比较常见的中间组件有 RocketMQ，Kafka，AMQP 等。这些中间件的目的是缓存生产者投递的消息直到消费者准备接收这些消息，以此将两端系统解耦。
消息驱动模式在服务之间提供了轻的耦合（这部分耦合指代 Producer/Consumer SDK），并可以对生产和消费服务根据诉求进行扩展。
事件驱动 Event- Driven
- CRM （客户关系系统）系统接收到客户购买信息，可自行更新客户的购买记录
- EMR（库存管理系统） 系统接收到客户购买信息，动态调整库存并及时补货
流是一组有序的无界事件或数据，执行操作通常是固定的某个事件段（E.g. 00:00 – 12:00）或一个相对事件（E.g. 过去12小时）。
- 依赖消息在流的时间或位置（E.g. offset，time）是有状态的。有状态操作中，流处理逻辑必须保留一些已被消费消息的内存。有状态包括对数据做 Batch Size，Batch Window 等。
kafka 是最典型的流式中间件，在流式场景中，事件的位置信息至关重要。通常情况下位置信息（E.g. offset）是由消费者托管的。
聊完 Event 和 Streaming 是什么，我们再来补充一点有关于他们的规范。
事件规范存在的目的是为了清晰事件生产者和消费者的关系，目前主要有两部分：AsyncAPI 和 CloudEvents
AsyncAPI：基于事件API提供了与之对应的 Open API 和 Swagger 等。
800 thoughts on “Message-Driven，Event-Driven & Streaming 解析”
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