Dynamic data models: an application of MOP-based persistence in Common Lisp

TL;DR

This paper introduces a method using MOP-based persistence in Common Lisp to dynamically modify data models, enabling flexible data storage and reducing service interruptions during development.

Contribution

It presents a portable and transparent approach to applying MOP-based persistence for dynamic data model modifications in Lisp applications.

Findings

Enables dynamic data model changes without service interruption

Provides a portable method for MOP-based persistence in Lisp

Improves flexibility in application prototyping and data storage

Abstract

The data model of an application, the nature and format of data stored across executions, is typically a very rigid part of its early specification, even when prototyping, and changing it after code that relies on it was written can prove quite expensive and error-prone. Code and data in a running Lisp image can be dynamically modified. A MOP-based persistence library can bring this dynamicity to the data model. This enables to extend the easy prototyping way of development to the storage of data and helps avoiding interruptions of service. This article presents the conditions to do this portably and transparently.