An efficient Java object mapping library “Orika”

1. What is Orika?

Orika is an efficient Java object mapping library that is specifically designed to simplify the conversion between objects in Java applications. It maps the properties of one object to another in an automated and optimized way, reducing the need to manually write repetitive code. Orika is particularly suitable for handling complex object structures and a large number of conversions between data transfer objects (DTOs) and entity objects.

2. Principle

The principle of Orika is mainly based on Java’s reflection mechanism and bytecode generation technology to achieve efficient object mapping. The following is a brief overview of how Orika works:

1. Reflection mechanism : Orika uses Java’s reflection mechanism to analyze the properties of source and target objects. This enables it to dynamically determine which properties need to be mapped and how to map them.
2. Bytecode generation : To improve performance, Orika generates bytecode at runtime to perform mapping operations. This approach is faster than traditional reflection calls because the generated bytecode can directly operate on the properties of the object without indirect access through reflection.
3. MapperFactory and MapperFacade : Orika uses MapperFactoryto configure and create mappers. MapperFacadeIt is a core interface that provides object mapping functionality. Developers perform mapping between objects by calling methods MapperFacade.map
4. Automatic and custom mapping : Orika supports automatic mapping, that is, if the attribute names and types of the source and target objects match, it will automatically map. For more complex mapping requirements, Orika allows developers to define custom mapping logic.
5. Built-in converters : Orika provides some built-in converters to handle common data type conversions. These converters can be automatically applied during the mapping process to ensure compatibility between different types.

3. Application scenarios

1. DTO and entity conversion : In a layered architecture, it is often necessary to convert between data transfer objects (DTO) and entity objects. Orika can automatically handle these conversions and reduce the writing of manual code.
2. Microservice architecture : In a microservice architecture, data exchange…