07ee94d671
* Refactor execute around the idiom * fix checkstyle errors Co-authored-by: Subhrodip Mohanta <hello@subho.xyz>
62 lines
2.2 KiB
Java
62 lines
2.2 KiB
Java
/*
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* The MIT License
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* Copyright © 2014-2021 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.execute.around;
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import java.io.File;
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import java.io.IOException;
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import java.util.Scanner;
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import lombok.extern.slf4j.Slf4j;
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/**
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* The Execute Around idiom specifies executable code before and after a method. Typically
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* the idiom is used when the API has methods to be executed in pairs, such as resource
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* allocation/deallocation or lock acquisition/release.
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*
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* <p>In this example, we have {@link SimpleFileWriter} class that opens and closes the file for
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* the user. The user specifies only what to do with the file by providing the {@link
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* FileWriterAction} implementation.
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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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public static void main(String[] args) throws IOException {
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// create the file writer and execute the custom action
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FileWriterAction writeHello = writer -> {
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writer.write("Gandalf was here");
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};
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new SimpleFileWriter("testfile.txt", writeHello);
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// print the file contents
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var scanner = new Scanner(new File("testfile.txt"));
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while (scanner.hasNextLine()) {
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LOGGER.info(scanner.nextLine());
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}
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}
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}
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