62 lines
2.7 KiB
Java
62 lines
2.7 KiB
Java
/*
|
|
* The MIT License
|
|
* Copyright © 2014-2021 Ilkka Seppälä
|
|
*
|
|
* Permission is hereby granted, free of charge, to any person obtaining a copy
|
|
* of this software and associated documentation files (the "Software"), to deal
|
|
* in the Software without restriction, including without limitation the rights
|
|
* to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
|
|
* copies of the Software, and to permit persons to whom the Software is
|
|
* furnished to do so, subject to the following conditions:
|
|
*
|
|
* The above copyright notice and this permission notice shall be included in
|
|
* all copies or substantial portions of the Software.
|
|
*
|
|
* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
|
|
* IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
|
|
* FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
|
|
* AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
|
|
* LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
|
|
* OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
|
|
* THE SOFTWARE.
|
|
*/
|
|
|
|
package com.iluwatar.business.delegate;
|
|
|
|
/**
|
|
* The Business Delegate pattern adds an abstraction layer between the presentation and business
|
|
* tiers. By using the pattern we gain loose coupling between the tiers. The Business Delegate
|
|
* encapsulates knowledge about how to locate, connect to, and interact with the business objects
|
|
* that make up the application.
|
|
*
|
|
* <p>Some of the services the Business Delegate uses are instantiated directly, and some can be
|
|
* retrieved through service lookups. The Business Delegate itself may contain business logic too
|
|
* potentially tying together multiple service calls, exception handling, retrying etc.
|
|
*
|
|
* <p>In this example the client ({@link MobileClient}) utilizes a business delegate (
|
|
* {@link BusinessDelegate}) to search for movies in video streaming services. The Business Delegate
|
|
* then selects the appropriate service and makes the service call.
|
|
*/
|
|
public class App {
|
|
|
|
/**
|
|
* Program entry point.
|
|
*
|
|
* @param args command line args
|
|
*/
|
|
public static void main(String[] args) {
|
|
|
|
// prepare the objects
|
|
var businessDelegate = new BusinessDelegate();
|
|
var businessLookup = new BusinessLookup();
|
|
businessLookup.setNetflixService(new NetflixService());
|
|
businessLookup.setYouTubeService(new YouTubeService());
|
|
businessDelegate.setLookupService(businessLookup);
|
|
|
|
// create the client and use the business delegate
|
|
var client = new MobileClient(businessDelegate);
|
|
client.playbackMovie("Die Hard 2");
|
|
client.playbackMovie("Maradona: The Greatest Ever");
|
|
}
|
|
}
|