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* #1299 IMPLEMENT IDENTITY MAP PATTERN. * #1299 Add docstrings, README, testCases and class diagram. * #1299 Update a comment string in DB implementation. * #1299 Fix code smells. * #1299 Fix code smells and add comments to App.java * #1299 Update constant name. * #1299 Remove java version dependency and update README.md. * #1299 Add lombok to PersonFinder.java. * #1299 Add dependency to maven-assembly-plugin. * #1299 Use java streams in PersonDbSimulatorImplementation.java. * #1299 Add print statements while returning the person object. * #1299 Update README.md. * #1299 Add puml file. * Update README.md
70 lines
2.7 KiB
Java
70 lines
2.7 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.Getter;
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import lombok.Setter;
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import lombok.extern.slf4j.Slf4j;
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/**
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* Any object of this class stores a DataBase and an Identity Map. When we try to look for a key we first check if
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* it has been cached in the Identity Map and return it if it is indeed in the map.
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* If that is not the case then go to the DataBase, get the record, store it in the
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* Identity Map and then return the record. Now if we look for the record again we will find it in the table itself which
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* will make lookup faster.
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*/
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@Slf4j
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@Getter
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@Setter
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public class PersonFinder {
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private static final long serialVersionUID = 1L;
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// Access to the Identity Map
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private IdentityMap identityMap = new IdentityMap();
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private PersonDbSimulatorImplementation db = new PersonDbSimulatorImplementation();
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/**
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* get person corresponding to input ID.
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*
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* @param key : personNationalId to look for.
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*/
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public Person getPerson(int key) {
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// Try to find person in the identity map
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Person person = this.identityMap.getPerson(key);
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if (person != null) {
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LOGGER.info("Person found in the Map");
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return person;
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} else {
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// Try to find person in the database
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person = this.db.find(key);
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if (person != null) {
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this.identityMap.addPerson(person);
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LOGGER.info("Person found in DB.");
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return person;
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}
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LOGGER.info("Person with this ID does not exist.");
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return null;
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}
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}
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}
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