September 2022
Beginner to intermediate
321 pages
4h 50m
Chinese
Content preview from 语义软件设计
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158
｜
第
7
章
我们应该思考更为普遍的情况，遵守前面讨论的规则，多种业务功能的选项会让产
品团队感到非常满意。
7.11
通过服务通信
正如
2001
年的贝索斯备忘录中所说，实现一个优秀的平台的方法是，所有通信只能
通过服务接口完成。服务必须拥有自己的数据。其他应用程序或服务不得走“后门”。
任何团队都不得直接从另一个团队（服务）的数据存储中读取数据。他们应该通过
服务接口通信。不允许团队直接通过链接、数据库级别的扩展查询、共享内存或特
定于供应商的数据处理扩展，来获取其他服务的数据。
服务是数据的主人，而且必须对这些数据负责，这些数据代表了领域的名词或功能。
在服务创建好后，所有其他的应用程序都应该使用该服务，而不应自行构建完全相
同或略不同的功能。
这意味着领域内的任何两个服务都不应重叠，或执行相同的工作。
7.12
对外公开
在本书中，我一直在强调，为了开发出更好的软件，我们必须减少假设。然而有一
种情况，在这种情况你下，做出假设或者至少做出一个模糊的期望，有助于提高设
计的弹性、性能和可扩展性。这个假设就是，编写的任何服务都可以对外公开，公
开到组织和应用程序之外，供其他业务部门使用，甚至公开到互联网上。
当然，此处我们需要把握平衡。如果根据近期的计划，没有公开服务的需要，而且
截止日期迫在眉睫，那么花费额外的时间为服务新建一个公共接口也不合适，因为
新接口（正如我们之前的讨论）需要单独构建和部署，并经历非常麻烦的变更请求
流程，而且如果没人打算使用该服务，则建立这样的接口没有丝毫用处，只会白白
浪费计算和存储资源。但这个假设的重点并不是完全照搬 ...
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O’Reilly covers everything we've got, with content to help us build a world-class technology community, upgrade the capabilities and competencies of our teams, and improve overall team performance as well as their engagement.Julian F.
I wanted to learn C and C++, but it didn't click for me until I picked up an O'Reilly book. When I went on the O’Reilly platform, I was astonished to find all the books there, plus live events and sandboxes so you could play around with the technology.Addison B.
I’ve been on the O’Reilly platform for more than eight years. I use a couple of learning platforms, but I'm on O'Reilly more than anybody else. When you're there, you start learning. I'm never disappointed.Amir M.
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.