Event Aggregator Message System

Event Aggregator Message System

EAMS is fast, reliable, type safe, productive and very very easy to use!

Every time any of your entities emits a signal that needs to be consumed by others entities, you are talking about EAMS!

Event Aggregator is a pattern that tries overcome the limitation of traditional event handling approach by providing a central place to publish and subscribe for events which is nothing but an Event Aggregator. The Event Aggregator takes care for registering, unregistering and invoking of events loosely coupling Publishers and Subscribers. All Publishers and Subscribers of event will know only about the Event Aggregator.

Traditional Event handling

The steps below describes Traditional Event Handling.

1. Publisher advertises its event(s) and specifies when they will be invoked.

2. A Subscriber will then register itself to Publisher event(s).

3. As Publisher object undergoes changes in its lifetime it will invoke the event informing the Subscriber(s).

Disadvantages of Traditional Event handling

● If there are multiple Subscribers and Publishers then code become hard to read and debug.

● The Subscriber of the event needs to know the Publisher of an event and refer it directly by event names causing a tight coupling between them.

● The tight coupling will not allow Subscribers and Publishers to change independently of each other.

● Its Subscriber responsibility to register and unregister from an event, its seen many practical scenarios the subscriber typically forgets to unregister causing both subscriber and publisher to be in memory causing memory leaks.

Intent of Event Aggregator Pattern implemented by this package:

● Simplify subscribing and unsubscribing to events

● Decouple publishers from subscribers allowing both to change without affecting the other.

● Makes it easy to add new events.

● Centralized handling of events.

*** All made simple for your use!***

Enjoy!