65 lines
3.0 KiB
Java
65 lines
3.0 KiB
Java
/**
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* The MIT License
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* Copyright (c) 2014-2016 Ilkka Seppälä
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*
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* Permission is hereby granted, free of charge, to any person obtaining a copy
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* of this software and associated documentation files (the "Software"), to deal
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* in the Software without restriction, including without limitation the rights
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* to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
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* copies of the Software, and to permit persons to whom the Software is
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* furnished to do so, subject to the following conditions:
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*
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* The above copyright notice and this permission notice shall be included in
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* all copies or substantial portions of the Software.
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*
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* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
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* IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
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* FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
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* AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
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* LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
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* OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
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* THE SOFTWARE.
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*/
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package com.iluwatar.eda;
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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.framework.Event;
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import com.iluwatar.eda.framework.EventDispatcher;
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import com.iluwatar.eda.handler.UserCreatedEventHandler;
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import com.iluwatar.eda.handler.UserUpdatedEventHandler;
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import com.iluwatar.eda.model.User;
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/**
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* An event-driven architecture (EDA) is a framework that orchestrates behavior around the
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* production, detection and consumption of events as well as the responses they evoke. An event is
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* any identifiable occurrence that has significance for system hardware or software. <p/> The
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* example below uses an {@link EventDispatcher} to link/register {@link Event} objects to their
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* respective handlers once an {@link Event} is dispatched, it's respective handler is invoked and
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* the {@link Event} is handled accordingly.
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*
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*/
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public class App {
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/**
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* Once the {@link EventDispatcher} is initialised, handlers related to specific events have to be
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* made known to the dispatcher by registering them. In this case the {@link UserCreatedEvent} is
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* bound to the UserCreatedEventHandler, whilst the {@link UserUpdatedEvent} is bound to the
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* {@link UserUpdatedEventHandler}. The dispatcher can now be called to dispatch specific events.
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* When a user is saved, the {@link UserCreatedEvent} can be dispatched.
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* On the other hand, when a user is updated, {@link UserUpdatedEvent} can be dispatched.
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*
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*/
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public static void main(String[] args) {
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EventDispatcher dispatcher = new EventDispatcher();
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dispatcher.registerHandler(UserCreatedEvent.class, new UserCreatedEventHandler());
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dispatcher.registerHandler(UserUpdatedEvent.class, new UserUpdatedEventHandler());
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User user = new User("iluwatar");
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dispatcher.dispatch(new UserCreatedEvent(user));
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dispatcher.dispatch(new UserUpdatedEvent(user));
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}
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}
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