mirror of
https://github.com/tiennm99/java-design-patterns.git
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Anurag Agarwal
ea57934db6
* Moves converter pattern to Java 11 * Moves cqrs pattern to Java 11 * Moves dao pattern to Java 11 * Moves data-bus pattern to Java 11 * Moves data-locality pattern to Java 11 * Moves data-mapper pattern to Java 11 * Moves data-transfer-object pattern to Java 11 * Moves decorator pattern to Java 11 * Moves delegation pattern to Java 11 * Moves dependency-injection to Java 11 * Moves dirty-flag to Java 11 * Moves double-buffer to Java 11 * Moves double-checked-locking to Java 11 * Moves double-dispatch to Java 11 * Corrects with changes thats breaking test cases
80 lines
2.5 KiB
Java
80 lines
2.5 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.dirtyflag;
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import java.io.BufferedReader;
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import java.io.File;
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import java.io.FileReader;
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import java.io.IOException;
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import java.util.List;
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import java.util.stream.Collectors;
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import org.slf4j.Logger;
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import org.slf4j.LoggerFactory;
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/**
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* A mock database manager -- Fetches data from a raw file.
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*
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* @author swaisuan
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*/
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public class DataFetcher {
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private static final Logger LOGGER = LoggerFactory.getLogger(DataFetcher.class);
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private final String filename = "world.txt";
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private long lastFetched;
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public DataFetcher() {
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this.lastFetched = -1;
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}
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private boolean isDirty(long fileLastModified) {
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if (lastFetched != fileLastModified) {
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lastFetched = fileLastModified;
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return true;
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}
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return false;
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}
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/**
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* Fetches data/content from raw file.
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*
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* @return List of strings
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*/
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public List<String> fetch() {
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var classLoader = getClass().getClassLoader();
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var file = new File(classLoader.getResource(filename).getFile());
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if (isDirty(file.lastModified())) {
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LOGGER.info(filename + " is dirty! Re-fetching file content...");
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try (var br = new BufferedReader(new FileReader(file))) {
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return br.lines().collect(Collectors.collectingAndThen(Collectors.toList(), List::copyOf));
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} catch (IOException e) {
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e.printStackTrace();
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}
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}
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return List.of();
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}
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}
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