March 2022
Beginner to intermediate
343 pages
6h 4m
Chinese
Content preview from 微服务即学即用
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78
｜
第
4
章
上下文1 上下文2
开放主
机服务
图
4
-
7
：开放主机服务
除了域之间的关系类型之外，上下文映射还可以根据有界上下文之间使用的
集成类型进行区分。
4.2.2
同步集成与异步集成
有界上下文之间的集成接口可以是同步的，也可以是异步的，如图
4-8
所示。
从根本上讲，没有一种集成模式采用单一风格。
上下文之间的同步集成的常见模式是：通过
HTTP
部署的
RESTful API
，使用
二进制格式（例如
protobuf
）的
gRPC
服务以及最近使用
GraphQL
接口的服务。
在异步方面，发布
-
订阅类型的交互起主导作用。在这种交互模式中，上游
可以生成事件，而下游服务的工作人员能够处理这些他们有兴趣的事件，如
图
4-8
所示。
同步 异步
客户端
请求
响应
供应商
订阅者
（客户）
订阅事件
发布者
（供应商）
发布事件消费事件
消息队列
（如Kafka或者Amazon SQS）
图
4
-
8
：同步和异步集成
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I'm always learning. So when I got on to O'Reilly, I was like a kid in a candy store. There are playlists. There are answers. There's on-demand training. It's worth its weight in gold, in terms of what it allows me to do.