content: package com.iluwatar.tolerantreader;
  
  import java.io.IOException;
  
  /**
   * 
   * Tolerant Reader is an integration pattern that helps creating robust communication
   * systems. The idea is to be as tolerant as possible when reading data from another
   * service. This way, when the communication schema changes, the readers must not break.
   * 
   * In this example we use Java serialization to write representations of RainbowFish
   * objects to file. RainbowFish is the initial version which we can easily read and
   * write using RainbowFishSerializer methods. RainbowFish then evolves to RainbowFishV2
   * and we again write it to file with a method designed to do just that. However, the reader
   * client does not know about the new format and still reads with the method designed for
   * V1 schema. Fortunately the reading method has been designed with the Tolerant Reader
   * pattern and does not break even though RainbowFishV2 has new fields that are serialized.
   *
   */
  public class App {
  	
      public static void main( String[] args ) throws IOException, ClassNotFoundException {
      	// Write V1
      	RainbowFish fishV1 = new RainbowFish("Zed", 10, 11, 12);
      	System.out.println(String.format("fishV1 name=%s age=%d length=%d weight=%d", fishV1.getName(), 
      			fishV1.getAge(), fishV1.getLengthMeters(), fishV1.getWeightTons()));
      	RainbowFishSerializer.writeV1(fishV1, "fish1.out");
      	// Read V1
      	RainbowFish deserializedFishV1 = RainbowFishSerializer.readV1("fish1.out");
      	System.out.println(String.format("deserializedFishV1 name=%s age=%d length=%d weight=%d", deserializedFishV1.getName(), 
      			deserializedFishV1.getAge(), deserializedFishV1.getLengthMeters(), deserializedFishV1.getWeightTons()));
      	// Write V2
      	RainbowFishV2 fishV2 = new RainbowFishV2("Scar", 5, 12, 15, true, true, true);
      	System.out.println(String.format("fishV2 name=%s age=%d length=%d weight=%d sleeping=%b hungry=%b angry=%b", fishV2.getName(), 
      			fishV2.getAge(), fishV2.getLengthMeters(), fishV2.getWeightTons(), fishV2.getHungry(), fishV2.getAngry(), fishV2.getSleeping()));
      	RainbowFishSerializer.writeV2(fishV2, "fish2.out");
      	// Read V2 with V1 method
      	RainbowFish deserializedFishV2 = RainbowFishSerializer.readV1("fish2.out");
      	System.out.println(String.format("deserializedFishV2 name=%s age=%d length=%d weight=%d", deserializedFishV2.getName(), 
      			deserializedFishV2.getAge(), deserializedFishV2.getLengthMeters(), deserializedFishV2.getWeightTons()));
      }
  }
  