In -depth understanding of the principles of the Java library implementation principle of CBOR (representative of concise binary objects)

In -depth understanding of the principles of the Java library implementation principle of CBOR (representative of concise binary objects) The concise binary object represents (CBOR) is a lightweight, efficient data serialization format, which uses binary codes to represent structured data.The design goal of CBOR is to make the data encoding and decoding process more efficient, while maintaining the compactness and readability of the data.In Java development, many CBOR class libraries can be used to process data in CBOR format. This article will in -depth the implementation principle of a CBOR Java library. In Java, there are many libraries that support CBOR, such as Jackson CBOR, Tinycbor, etc.This article uses Jackson CBOR as an example to explain the implementation principle of the CBOR's Java class library. Jackson CBOR is part of the Jackson family. It is a expansion based on the core library of Jackson, which aims to provide support for CBOR format.It can implement data coding and decoding by converting the Java object to the byte stream of the CBOR format, or the byte flow in the CBOR format into a Java object.Jackson CBOR uses a mechanism called "tag" to identify the components of the CBOR byte stream. The implementation principle of Jackson CBOR can be summarized as the following steps: 1. Define the Java class and annotations: First of all, we need to define the Java classes that need to be serialized/counter -serialization into CBOR format, and use the annotations provided by Jackson to mark the attributes.These annotations tell Jackson CBOR how to convert the Java object into a CBOR format. public class Person { @JsonProperty("name") private String name; @JsonProperty("age") private int age; // omit the getter and setter method } 2. Create ObjectMapper: When processing data in the CBOR format, we need to use the ObjectMapper class provided by Jackson.It is the core class of the Jackson CBOR library, responsible for the actual CBOR encoding and decoding. ObjectMapper objectMapper = new ObjectMapper(new CBORFactory()); 3. Code to CBOR format: When we need to encode the Java object into a CBOR format, we can use the Writevalue () method of ObjectMapper.This method converts the Java object to the byte stream of the CBOR format. Person person = new Person("Alice", 25); byte[] cborData = objectMapper.writeValueAsBytes(person); 4. Decoding CBOR format: When we need to decode the byte flow of the CBOR format as the Java object, we can use ObjectMapper's readvalue () method.This method accepts byte flow in a CBOR format and converts it into a Java object. Person decodedPerson = objectMapper.readValue(cborData, Person.class); The above steps are only the basic principles of the CBOR class library, and the real realization may be more complicated.CBOR class libraries need to process various CBOR data types, such as integer, floating point number, string, array, etc., as well as nested structure and reference.It also needs to take into account the compactness and readability of data, as well as factors such as compatibility and performance. In summary, the principle of CBOR's Java library implementation mainly depends on the encoding and decoding process of data.It uses a mechanism to mark the various components of the CBOR byte flow, and use a series of conversion to realize the mutual conversion between the Java object and the CBOR format.Different CBOR class libraries may have different implementation details, but their basic principles are roughly the same. Reference materials: 1. "Jackson CBOR - Binary Format Documentation" - FasterXML (https://github.com/FasterXML/jackson-dataformats-binary/blob/master/cbor/src/main/asciidoc/binary-format.adoc) 2. "Understanding CBOR (Concise Binary Object Representation)" - Brian Sletten (https://www.safaribooksonline.com/library/view/programming-web-apis/9781449304343/ch08s11.html)