November 2021
Beginner to intermediate
239 pages
4h 15m
Chinese
Content preview from Dapr学习手册
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服务
｜
53
PaaS
（
Platform as a Service
，平台即服务）则显得更有主见一些。当你遵循
PaaS
平台选择的编程模式时，就可以从很多基础设施的负担中解脱出来。
Dapr
设计为可以和不同的
PaaS
平台配合工作。从架构上看，
Dapr
只是一
组应用可以使用的服务端点。在某种程度上，它是应用可以使用的“本地
SaaS
”。它并不强制要求应用如何编写，或者应用使用哪些框架。
由于
Dapr
以
sidecar
的形式运行，因此它可以与任何支持分组容器概念的无
服务器
(serverless)
平台一起工作。这包括不同风格的
Kubernetes
托管集群，
如支持容器组的
Azure
容器实例（
Azure Container Instances
，
ACI
）。如果要
在不支持容器组的
serverless
平台上运行，可以将
Dapr
进程打包为应用容器
的一部分。
带着这些讨论，我们现在将介绍
Dapr
如何在分布式组件之间提供服务调用
（
service invocation
）的抽象。服务调用功能提供了基本的支持，使得微服务
应用程序中的组件能够相互通信。
1.3
服务调用
如图
1-1
所示，多个服务可以通过
Dapr sidecar
相互通信。当服务
a
（由名为
dapr-a
的
Dapr sidecar
表示）试图调用服务
b
（由名为
dapr-b
的
Dapr sidecar
表示）
定义的方法
foo
时，请求会经过以下步骤：
1.
服务
a
通过
localhost:3500
向自己的
Dapr sidecar
发送请求（假设
sidecar
监听端口为
3500
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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.