mirror of
https://github.com/tiennm99/java-design-patterns.git
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Anurag Agarwal
670c4e43f3
* Moves facade to Java 11 * Moves factory-kit to Java 11 * Moves factory-method to Java 11 * Moves feature-toggle to Java 11 * Moves fluentinterface to Java 11 * Moves flux to Java 11 * Moves flyweight to Java 11 * Moves front-controller to Java 11 * Uses stream properly * Resolves issues with ci
106 lines
4.8 KiB
Java
106 lines
4.8 KiB
Java
/*
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* The MIT License
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* Copyright © 2014-2019 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.featuretoggle;
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import com.iluwatar.featuretoggle.pattern.Service;
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import com.iluwatar.featuretoggle.pattern.propertiesversion.PropertiesFeatureToggleVersion;
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import com.iluwatar.featuretoggle.pattern.tieredversion.TieredFeatureToggleVersion;
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import com.iluwatar.featuretoggle.user.User;
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import com.iluwatar.featuretoggle.user.UserGroup;
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import java.util.Properties;
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import org.slf4j.Logger;
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import org.slf4j.LoggerFactory;
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/**
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* The Feature Toggle pattern allows for complete code executions to be turned on or off with ease.
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* This allows features to be controlled by either dynamic methods just as {@link User} information
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* or by {@link Properties}. In the App below there are two examples. Firstly the {@link Properties}
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* version of the feature toggle, where the enhanced version of the welcome message which is
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* personalised is turned either on or off at instance creation. This method is not as dynamic as
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* the {@link User} driven version where the feature of the personalised welcome message is
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* dependant on the {@link UserGroup} the {@link User} is in. So if the user is a memeber of the
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* {@link UserGroup#isPaid(User)} then they get an ehanced version of the welcome message.
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*
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* <p>Note that this pattern can easily introduce code complexity, and if not kept in check can
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* result in redundant unmaintained code within the codebase.
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*/
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public class App {
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private static final Logger LOGGER = LoggerFactory.getLogger(App.class);
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/**
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* Block 1 shows the {@link PropertiesFeatureToggleVersion} being run with {@link Properties}
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* setting the feature toggle to enabled.
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*
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* <p>Block 2 shows the {@link PropertiesFeatureToggleVersion} being run with {@link Properties}
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* setting the feature toggle to disabled. Notice the difference with the printed welcome message
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* the username is not included.
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*
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* <p>Block 3 shows the {@link
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* com.iluwatar.featuretoggle.pattern.tieredversion.TieredFeatureToggleVersion} being set up with
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* two users on who is on the free level, while the other is on the paid level. When the {@link
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* Service#getWelcomeMessage(User)} is called with the paid {@link User} note that the welcome
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* message contains their username, while the same service call with the free tier user is more
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* generic. No username is printed.
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*
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* @see User
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* @see UserGroup
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* @see Service
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* @see PropertiesFeatureToggleVersion
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* @see com.iluwatar.featuretoggle.pattern.tieredversion.TieredFeatureToggleVersion
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*/
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public static void main(String[] args) {
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final var properties = new Properties();
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properties.put("enhancedWelcome", true);
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var service = new PropertiesFeatureToggleVersion(properties);
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final var welcomeMessage = service.getWelcomeMessage(new User("Jamie No Code"));
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LOGGER.info(welcomeMessage);
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// ---------------------------------------------
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final var turnedOff = new Properties();
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turnedOff.put("enhancedWelcome", false);
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var turnedOffService = new PropertiesFeatureToggleVersion(turnedOff);
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final var welcomeMessageturnedOff =
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turnedOffService.getWelcomeMessage(new User("Jamie No Code"));
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LOGGER.info(welcomeMessageturnedOff);
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// --------------------------------------------
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var service2 = new TieredFeatureToggleVersion();
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final var paidUser = new User("Jamie Coder");
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final var freeUser = new User("Alan Defect");
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UserGroup.addUserToPaidGroup(paidUser);
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UserGroup.addUserToFreeGroup(freeUser);
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final var welcomeMessagePaidUser = service2.getWelcomeMessage(paidUser);
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final var welcomeMessageFreeUser = service2.getWelcomeMessage(freeUser);
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LOGGER.info(welcomeMessageFreeUser);
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LOGGER.info(welcomeMessagePaidUser);
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}
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}
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