projector-workshop

A workshop designed around the Projector component type.

What is a Projector?

A projector has an ingress of events and persists state externally.

Component Types

Input/Output	Events	Commands	External
Events	Translator (ACL)	Process Manager	Projector (Projection)
Commands	Aggregator (Aggregate)	Controller (Translator/ACL)	Actuator
External	Sensor	Actor	System

Prerequisites

• .NET
  • Visual Studio Code (or anything that can be used for dotnet development)
  • .NET Core SDK 2.2 or later
  • C# for Visual Studio Code version 1.17.1 or later
  • F#: Ionide-fsharp

Workshop

In this workshop we will be working with the an inventory item example. Assume this example is for a store and a user can be create, stock, sell, activate, and deactivate inventory items.

State

InventoryItem is a container that holds state.

inventoryItem:
    id: e85c1ec3-f077-4625-adf2-5a593a293988
    name: "Item 1"
    count: 212
    active: true
    soldOut: false

Events

InventoryEvent defines the events that can happen to an InventoryItem state.

- Created:
    InventoryId: e85c1ec3-f077-4625-adf2-5a593a293988
    Name: "Item 1"

- Stocked:
    Count: 123

- Sold:
    Count: 43

- Activated

- Deactivated