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chris
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iluwatar#113 Event Driven Architecture
- added class diagram - added more comments
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‎event-driven-architecture/etc/class_diagram.png‎

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‎event-driven-architecture/index.md‎

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**Real world examples:**
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* A Loan Application has been accepted/rejected (commercial business).
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* A Loan Application has been accepted/rejected (Commercial Business).
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* A new Rostering Schedule is ready for distribution to all crew (Airline Management System).
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* An Illegal Trade Pattern has been detected (Trading Fraud Detection System).
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* A simulated car has hits another simulated car (Commercial Racing Game).
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* [Event-driven architecture - Wikipedia](http://www.computerweekly.com/feature/Write-through-write-around-write-back-Cache-explained)
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* [Fundamental Components of an Event-Driven Architecture](http://giocc.com/fundamental-components-of-an-event-driven-architecture.html)
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* [Real World Applications/Event Driven Applications](https://wiki.haskell.org/Real_World_Applications/Event_Driven_Applications)
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* [Real World Applications/Event Driven Applications](https://wiki.haskell.org/Real_World_Applications/Event_Driven_Applications)
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* [Event-driven architecture definition](http://searchsoa.techtarget.com/definition/event-driven-architecture)
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*

‎event-driven-architecture/src/main/java/com/iluwatar/eda/App.java‎

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package com.iluwatar.eda;
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import com.iluwatar.eda.event.Event;
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import com.iluwatar.eda.event.UserCreatedEvent;
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import com.iluwatar.eda.event.UserUpdatedEvent;
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import com.iluwatar.eda.handler.UserCreatedEventHandler;
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import com.iluwatar.eda.handler.UserUpdatedEventHandler;
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/**
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* An event-driven architecture (EDA) is a framework that orchestrates behavior around the production,
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* detection and consumption of events as well as the responses they evoke.
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* An event is any identifiable occurrence that has significance for system hardware or software.
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* <p/>
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* The example below we uses an {@link EventDispatcher} to link/register {@link Event} objects to
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* their respective handlers Once an {@link Event} is dispatched,
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* it's respective handler is invoked and the {@link Event} is handled accordingly
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*/
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public class App {
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public static void main(String[] args) {
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EventDispatcher dispatcher = new EventDispatcher();
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dispatcher.registerChannel(UserCreatedEvent.class, new UserCreatedEventHandler());
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dispatcher.registerChannel(UserUpdatedEvent.class, new UserUpdatedEventHandler());
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dispatcher.dispatch(new UserCreatedEvent());
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dispatcher.dispatch(new UserUpdatedEvent());
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}
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}

‎event-driven-architecture/src/main/java/com/iluwatar/eda/EventDispatcher.java‎

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package com.iluwatar.eda;
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import com.iluwatar.eda.event.Event;
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import com.iluwatar.eda.framework.Channel;
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import com.iluwatar.eda.framework.DynamicRouter;
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import java.util.HashMap;
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import java.util.Map;
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/**
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* The {@link Event Dispatcher} handles routing of {@link Event} messages to associated channels.
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* A {@link HashMap} is used to store the association between events and their respective handlers.
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*/
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public class EventDispatcher implements DynamicRouter<Event> {
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private Map<Class<? extends Event>, Channel> handlers;
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public EventDispatcher() {
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handlers = new HashMap<Class<? extends Event>, Channel>();
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}
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/**
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* Links an {@link Event} to a specific {@link Channel}
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* @param contentType The {@link Event} to be registered
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* @param channel The {@link Channel} that will be handling the {@link Event}
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*/
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public void registerChannel(Class<? extends Event> contentType,
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Channel channel) {
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handlers.put(contentType, channel);
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}
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/**
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* Dispathes an {@link Event} depending on it's type.
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* @param content The {@link Event} to be dispatched
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*/
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public void dispatch(Event content) {
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handlers.get(content.getClass()).dispatch(content);
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}
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}

‎event-driven-architecture/src/main/java/com/iluwatar/eda/advanced/App.java‎

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‎event-driven-architecture/src/main/java/com/iluwatar/eda/advanced/EventDispatcher.java‎

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‎event-driven-architecture/src/main/java/com/iluwatar/eda/advanced/events/UserCreatedEvent.java‎

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‎event-driven-architecture/src/main/java/com/iluwatar/eda/advanced/events/UserUpdatedEvent.java‎

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‎event-driven-architecture/src/main/java/com/iluwatar/eda/advanced/framework/Channel.java‎

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‎event-driven-architecture/src/main/java/com/iluwatar/eda/advanced/framework/DynamicRouter.java‎

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