November 2021
Beginner to intermediate
239 pages
4h 15m
Chinese
Content preview from Dapr学习手册
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Actor
｜
167
和其他
actor
框架一样，
Dapr actor
可以由外部调用或由内部的定时器（
timer
）
和
reminder
触发的信号来触发。
接下来，我们将研究其工作原理。
5.2.3
计时器
计时器是一种根据给定时间表为
actor
安排特定工作的方式。当
actor
被计时
器触发时，它可以更改其状态。计时器不是持久化的，因此当一个
actor
出现
故障转移到其他主机，或在垃圾回收后重新被激活后，计时器不会被调用。
每当
actor
被成功激活时，它都有责任重新注册计时器。
以下示例显示了如何通过
HTTP
创建
actor
计时器：
curl http://localhost:3500/v1.0/actors/stormtrooper/50/timers/checkRebels \
-H "Content-Type: application/json"
-d '{
"data": "someData",
"dueTime": "1m",
"period": "20s",
"callback": "myEventHandler"
}'
本示例调用
ID
为
50
的类型为
stormtrooper
的
actor
，并创建了一个名为
checkRebels
的计时器。在发送给
Dapr
运行时的
HTTP POST
请求体中，我
们可以看到
data
字段已附加到调用中。
当计时器触发时，该数据将被传递给
actor
实例。
dueTime
字段是计时器被首次触发之前要等待的初始超时时间。 ...
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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.