September 2022
Beginner to intermediate
321 pages
4h 50m
Chinese
Content preview from 语义软件设计
Become an O’Reilly member and get unlimited access to this title plus top books and audiobooks from O’Reilly and nearly 200 top publishers, thousands of courses curated by job role, 150+ live events each month,
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.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.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.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.
数据
｜
199
二进制文件，并将它们添加到引擎的
classpath
中，或者直接捆绑到引擎的部署文件
中。提供这样的选择需要一些额外的工作，但如果想获取网络访问的灵活性，并通
过避免网络跳跃和转换获取更高的性能，这些工作都是有必要的。
你可以使用
Facade
模式来实现这一点。默认选项是简单地提供原生接口，可以通过
classpath
直接作为库访问。然后，提供一个
Facade
接口，将数据访问服务与服务端
点打包，以方便交换
JSON
、
ProtoBuf
或其他格式的数据。
代理模式（
https://en.wikipedia.org/wiki/Proxy_pattern
）提供了一种简单的方法，无
须修改原始对象即可修改对象的行为。为此，你需要实现原本的数据访问器，并部
署一个代理，该代理公开的功能相同，但提供了
HTTP
断电所需的转换，因此可以
通过
JSON
消息接收请求和发布响应。
8.8
点对点持久存储
主从范式的数据库扩展非常流行，因为好处很明显：性能一般都很好，而且响应时
间合理，还可以实现数据复制，从而防止严重停机。你可以获取数据库的报告，并
进行分析。
主从数据库有一个明显的问题：单点故障。当一对术语有明确的二元对立含义，且
明显偏向某一方时，就会出现一些常见的问题。在解构设计中，我们会质疑底层的
结构，思考如何推翻和颠覆这样的主从关系，以达到改进设计的目的。
这个问题有一个很简单的解决方案是点对点数据库，比如
Apache Cassandra
。在
Cassandra
中，每个节点在拓扑中的功能都相同。没有特权节点。由于数据分布到了 ...
Become an O’Reilly member and get unlimited access to this title plus top books and audiobooks from O’Reilly and nearly 200 top publishers, thousands of courses curated by job role, 150+ live events each month,
and much more.
Read now
Unlock full access
More than 5,000 organizations count on O’Reilly
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.