November 2021
Beginner to intermediate
239 pages
4h 15m
Chinese
Content preview from Dapr学习手册
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状态
｜
95
事务性状态存储需要实现额外的
TransactionalStore
接口：
type TransactionalStore interface {
Init(metadata Metadata) error
Multi(reqs []TransactionalRequest) error
}
你可以为每个请求附加额外的选项。
Dapr
为每个操作定义了一些预定义的属
性。它还允许在请求中附加一个键
/
值
map
，并将其原封不动地传递给底层
数据存储。这种设计允许数据存储在基本
API
之上提供额外的功能。然而，
当使用存储特定的属性时，代码在不同的状态存储中的可移植性会较差。
2.3.1 Key
方案
所有的状态存储都要遵循相同的
key
方案。对于通常的状态，
key
的格
式为
*<Dapr ID>||<state key>*
。对于
Actor
状态，
key
格式为
*<App
ID>||<Actor type>||<Actor ID>||<state key>*
。当调用
Dapr state API
时，
提供
state key
。
Dapr
会自动加入
Dapr ID
。例如，向
Dapr ID dapr1
发送的状
态请求，如果其
state key
为
mystate
，则使用
dapr1||mystate
作为访问底层
状态存储的实际密钥
译注
2
。
2.3.2 Get
请求
Get
请求有一个
consistency
选项，其值可以是
eventual
或
strong
。某些状
态存储（如
Azure Cosmos ...
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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.