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Ilkka Seppälä
73 lines
2.9 KiB
Java
73 lines
2.9 KiB
Java
/*
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* This project is licensed under the MIT license. Module model-view-viewmodel is using ZK framework licensed under LGPL (see lgpl-3.0.txt).
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*
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* The MIT License
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* Copyright © 2014-2022 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.identitymap;
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import lombok.extern.slf4j.Slf4j;
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/**
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* The basic idea behind the Identity Map is to have a series of maps containing objects that have been pulled from the database.
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* The below example demonstrates the identity map pattern by creating a sample DB.
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* Since only 1 DB has been created we only have 1 map corresponding to it for the purpose of this demo.
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* When you load an object from the database, you first check the map.
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* If there’s an object in it that corresponds to the one you’re loading, you return it. If not, you go to the database,
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* putting the objects on the map for future reference as you load them.
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*/
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@Slf4j
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public class App {
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/**
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* Program entry point.
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*
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* @param args command line args.
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*/
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public static void main(String[] args) {
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// Dummy Persons
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Person person1 = new Person(1, "John", 27304159);
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Person person2 = new Person(2, "Thomas", 42273631);
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Person person3 = new Person(3, "Arthur", 27489171);
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Person person4 = new Person(4, "Finn", 20499078);
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Person person5 = new Person(5, "Michael", 40599078);
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// Init database
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PersonDbSimulatorImplementation db = new PersonDbSimulatorImplementation();
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db.insert(person1);
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db.insert(person2);
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db.insert(person3);
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db.insert(person4);
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db.insert(person5);
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// Init a personFinder
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PersonFinder finder = new PersonFinder();
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finder.setDb(db);
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// Find persons in DataBase not the map.
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LOGGER.info(finder.getPerson(2).toString());
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LOGGER.info(finder.getPerson(4).toString());
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LOGGER.info(finder.getPerson(5).toString());
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// Find the person in the map.
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LOGGER.info(finder.getPerson(2).toString());
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}
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}
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