Triggers

Triggers are the starts of pipelines. A trigger can be manual, event or timed (e.g. cron).

Origin of the Symbol

The circle and rectangle like symbols were taken. So we picked the triangle next.

Processor Types

Currently there are symbols for 4 trigger types:

trigger type	image	description
standard
manual trigger		A manual trigger is a trigger that a human manually triggers. This can be by pressing buttons in the was console, using a CLI command or by pressing a button on a website.
timed trigger		A timed trigger is a trigger that somehow runs on a timed schedule. The most likely timed trigger is a small piece of code that runs regularly using something like cron. An example of a timed trigger is an AWS Lambda function that runs according to timed cloud watch events. The timed trigger is denoted by a capital L. Where the L stands for the two hands of a clock. On a whiteboard you might actually make it look more like a 2 o’clock symbol.
event trigger		An evented trigger executes when an event happens. An event could be a cloud watch alarm or a custom cloud watch event firing a lambda function.

Double type triggers

A manual trigger is the “most basic” trigger, since you will normally see that each trigger can somehow be manually invoked. Therefore, if the same trigger is of 2 types, e.g. manual and typed, we only model the typed version.

An example of this is a lambda function that starts a pipeline. The lambda itself is seen as the trigger in this case. If that lambda gets invoked by hand, through the aws cli or console, this is seen as a manual trigger.