Message system refactoring using DSL

This article covers the message delivery system refactoring using Domain Driven Development (DDD) and Domain Specific Language (DSL) approach. First it explains the main concepts of Domain Driven Development and Domain Specific Language. After that it describes the steps of development process based on Domain Specific Language including domain model design and development of DSL notation by the example of message delivery system. In conclusion it overviews key benefits provided by DDD and DSL approach (compare with previous version of message delivery system).