Event Duplication

Question

In my Robotlegs app service results often have to be persisted in models. This creates event pairs that have identical payload types:

1. to carry the data from service to command,
2. to carry the data from model to mediator

I'm wondering how to name these events. Imagine I have a service:

FooService.getProducts()

Then I have a model:

BarModel.setProducts()
BarModel.getProducts()

What is the best way to name the event dispatched by the service after it retrieves the product collection?

What is the best way to name the event dispatched by the model after BarModel.setProducts() has been invoked?

Or maybe I should use a single event with two different types:

public class ProductEvent extends Event
{
    public const SERVICE_PRODUCT_CHANGE:String = 'serviceProductChange';
    public const MODEL_PRODUCT_CHANGE:String = 'modelProductChange';
    ...

Answer 1

I've made up my own naming scheme that answers my question.

First of all, most often events are used to propagate data between actors:

• service > model
• model > mediator
• mediator > model

Secondly, different events carry different data types. Thirdly, the same data often must be passed two times: service > model > mediator.

Based on this I've decided to name my event like this:

<class>Event_<payload>

Where class is the name of the class that dispatches the event and payload is the name of the public property that changed. For example:

• ProductServiceEvent_products
• ProductModelEvent_products
• ProductViewEvent_products

Each event has only one type called CHANGE.