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Reformat rest of the design patterns - Issue #224

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This commit is contained in:
Ankur Kaushal
2015-11-01 21:29:13 -05:00
parent 449340bd2b
commit 306b1f3d31
337 changed files with 6744 additions and 6851 deletions
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66
tolerant-reader/src/main/java/com/iluwatar/tolerantreader/App.java
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@@ -4,39 +4,43 @@ 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.
* 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.
* <p>
* In this example we use Java serialization to write representations of {@link RainbowFish}
* objects to file. {@link RainbowFish} is the initial version which we can easily read and
* write using {@link RainbowFishSerializer} methods. {@link RainbowFish} then evolves to {@link 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 {@link RainbowFishV2} has new fields that are serialized.
* In this example we use Java serialization to write representations of {@link RainbowFish} objects
* to file. {@link RainbowFish} is the initial version which we can easily read and write using
* {@link RainbowFishSerializer} methods. {@link RainbowFish} then evolves to {@link 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 {@link 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()));
}
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()));
}
}