January 2023
Intermediate to advanced
458 pages
14h 16m
Chinese
Content preview from 可编程网络自动化
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364
｜
第
9
章
9.4.5
规则
终于到了迄今为止所学的核心所在。概括地说，动作允许执行基本的自动化。在
StackStorm
中
，传感器和触发器代表“事件”。现在要想实现事件驱动自动化，需要一种
将触发器中的事件绑定到动作或工作流的方法。这正是规则发挥作用之处。
（像
StackStorm
中的很多其他东西一样）规则是在
Y
AML
文件中定义的。简单来讲，规则
就是“当
X
发生时，执行
Y
”。在我们的例子中，
X
是触发器实例，
Y
是动作或工作流。
关于规则的一个最简单的示例是每隔几秒执行一次
echo
命令。
StackStorm
有一个特殊的触
发器
core.st2.IntervalTimer
，允许将已过去的一段时间作为一个可操作的事件。
---
name: sample_rule_with_timer
pack: "examples"
description: Sample rule using an Interval Timer.
enabled: true
trigger:
parameters:
delta: 5
unit: seconds
type: core.st2.IntervalTimer
criteria: {}
action:
parameters:
cmd: echo "{{trigger.executed_at}}"
ref: core.local
每条规则有
3
个主要部分。
trigger
这部分指定了要监视的触发器名称（本例中是
core.st2.IntervalTimer ...
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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.
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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.