Understand the technical principles of the Kryo framework in the Java library

Kryo is an efficient Java serialization framework that is used to fast serialized objects in the Java class library and stores it on a disk or transmitted via the network.It is widely used in the big data processing framework (such as Apache Spark) because it is better than Java's default serialization mechanism in terms of performance and spatial efficiency. Kryo's technical principles mainly include the following aspects: 1. Object diagram traversal: Kryo uses depth priority algorithm to traverse the object diagram to serialize.Starting from the root object, it gradually accesss each field of the object and serializes them recursively. 2. Registration class and field: In order to improve performance, Kryo will register for all classification classes before serialization.Registered classes and field information are cached to avoid reflection operations at each serialization.You can register by calling `kryo.register (class)`, and use the serialization method of the specified field with the `FieldSerializer`. 3. Custom serializer: Kryo allows users to provide custom serializers for specific classes.Customized serializers can better control the process of serialization and desertification, and can be optimized for specific application scenarios. Below is a simple Java code example, demonstrating how to use Kryo for the serialization and derivativeization of the object: // Import Kryo -related classes import com.esotericsoftware.kryo.Kryo; import com.esotericsoftware.kryo.io.Input; import com.esotericsoftware.kryo.io.Output; // Define a class to serialize class MyClass { String name; int value; // omit the creation function and other methods } public class KryoExample { public static void main(String[] args) { // Create and configure the Kryo object Kryo kryo = new Kryo(); kryo.register (myclass.class); // Register a class to serialize // Create an output stream to store the serialized data Output output = new Output(new FileOutputStream("data.bin")); // Create an object to be serialized MyClass objectToSerialize = new MyClass(); objectToSerialize.name = "Alice"; objectToSerialize.value = 42; // Serialized objects kryo.writeObject(output, objectToSerialize); output.close(); // Create an input stream to read the serialization data Input input = new Input(new FileInputStream("data.bin")); // Reverse sequentialization object MyClass deserializedObject = kryo.readObject(input, MyClass.class); input.close(); // Print the target attribute after the printed back -sequentialization System.out.println(deserializedObject.name); System.out.println(deserializedObject.value); } } In the above example, we first created a `kryo` object and registered the` MyClass` class to be serialized.Then, we serialize a `myclass` object to the` data.bin` file.Then, we read the data from the file and derived from the file to obtain a new `MyClass` object and print out its attributes. By using the Kryo framework, we can easily achieve the efficient serialization and derivativeization of the object, and improve performance and space efficiency in the fields of big data processing.