mirror of
https://github.com/tiennm99/java-design-patterns.git
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Ilkka SeppäläandGitHub
0ca162a55c
* remove spring dep move junit, logging, mockito under dep mgmt * upgrade anti-corruption-layer deps * async method invocation * balking, bloc * bridge to bytecode * caching * callback - cqrs * component - health check * hexagonal - metadata mapping * rest of the patterns * remove checkstyle, take spotless into use
87 lines
3.9 KiB
Java
87 lines
3.9 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.tolerantreader;
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import java.io.IOException;
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import lombok.extern.slf4j.Slf4j;
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/**
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* Tolerant Reader is an integration pattern that helps to create robust communication systems. The
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* idea is to be as tolerant as possible when reading data from another service. This way, when the
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* communication schema changes, the readers must not break.
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*
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* <p>In this example we use Java serialization to write representations of {@link RainbowFish}
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* objects to file. {@link RainbowFish} is the initial version which we can easily read and write
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* using {@link RainbowFishSerializer} methods. {@link RainbowFish} then evolves to {@link
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* RainbowFishV2} and we again write it to file with a method designed to do just that. However, the
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* reader client does not know about the new format and still reads with the method designed for V1
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* schema. Fortunately the reading method has been designed with the Tolerant Reader pattern and
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* does not break even though {@link RainbowFishV2} has new fields that are serialized.
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*/
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@Slf4j
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public class App {
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/** Program entry point. */
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public static void main(String[] args) throws IOException, ClassNotFoundException {
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// Write V1
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var fishV1 = new RainbowFish("Zed", 10, 11, 12);
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LOGGER.info(
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"fishV1 name={} age={} length={} weight={}",
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fishV1.getName(),
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fishV1.getAge(),
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fishV1.getLengthMeters(),
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fishV1.getWeightTons());
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RainbowFishSerializer.writeV1(fishV1, "fish1.out");
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// Read V1
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var deserializedRainbowFishV1 = RainbowFishSerializer.readV1("fish1.out");
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LOGGER.info(
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"deserializedFishV1 name={} age={} length={} weight={}",
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deserializedRainbowFishV1.getName(),
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deserializedRainbowFishV1.getAge(),
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deserializedRainbowFishV1.getLengthMeters(),
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deserializedRainbowFishV1.getWeightTons());
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// Write V2
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var fishV2 = new RainbowFishV2("Scar", 5, 12, 15, true, true, true);
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LOGGER.info(
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"fishV2 name={} age={} length={} weight={} sleeping={} hungry={} angry={}",
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fishV2.getName(),
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fishV2.getAge(),
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fishV2.getLengthMeters(),
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fishV2.getWeightTons(),
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fishV2.isHungry(),
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fishV2.isAngry(),
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fishV2.isSleeping());
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RainbowFishSerializer.writeV2(fishV2, "fish2.out");
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// Read V2 with V1 method
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var deserializedFishV2 = RainbowFishSerializer.readV1("fish2.out");
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LOGGER.info(
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"deserializedFishV2 name={} age={} length={} weight={}",
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deserializedFishV2.getName(),
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deserializedFishV2.getAge(),
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deserializedFishV2.getLengthMeters(),
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deserializedFishV2.getWeightTons());
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}
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}
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