November 2021
Beginner to intermediate
239 pages
4h 15m
Chinese
Content preview from Dapr学习手册
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消息
｜
117
2.
连接到光学字符识别（
OCR
）服务以检测文本。
3.
将检测到的文本发送到智能合约，对识别到的文档内容进行存档。
3.1.3 Pub/Sub
在第
1
章中，我们简要谈了一下发布
/
订阅。
如你所见，
Dapr
本身并不是消
息总线。
相反，
Dapr
集成了主流的消息总线（感谢我们社区的巨大贡献！）
来投递消息。
Dapr
选择使用
CloudEvents v1.0
（
https://oreil.ly/FKFGe
）（一个
CNCF
项
目）作为通用事件封装格式，以提高连接服务之间的互操作性。
CloudEvents
将事件定义为和发生有关的上下文和数据。
事件可以通过
HTTP
、
AMQP
、
MQTT
和
SMTP
等行业标准来投递。以下是
CloudEvents
库中的示例（序列
化为
JSON
文本）：
{
"specversion" : "1.0",
"type" : "com.github.pull.create",
"source" : "https://github.com/cloudevents/spec/pull",
"subject" : "123",
"id" : "A234-1234-1234",
"time" : "2018-04-05T17:31:00Z",
"comexampleextension1" : "value",
"comexampleothervalue" : 5,
"datacontenttype" : "text/xml",
"data" : ...
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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.