Intelligent Mainframe Modernization: Applying Domain-Driven Design to Extract Business Capabilities from Legacy Systems
Keywords:
Mainframe Modernization, Domain-Driven Design, Microservices, Bounded Contexts, Reverse Engineering, Restful APIAbstract
Background: Legacy mainframe systems are a large part of an enterprise IT ecosystem today․ Their tightly coupled architecture makes them difficult to modernize, and customary approaches such as re-architecting or lift-and-shift migration present operational and functional risk due to the undocumented business logic that has spread through a codebase over decades.
Objective: To present a framework that combines domain-driven design (DDD) and reverse engineering techniques to support the business-oriented, systematic modernization of legacy mainframe systems.
Methods: Bounded context analysis identifies business capabilities from monolithic mainframe architectures․ Static and dynamic analysis recognize areas in a system that are tightly coupled and potential candidates for service boundaries․ These boundaries are then implemented as independent microservices with RESTful APIs, deployed to container-based cloud-native infrastructures with automated testing and validation pipelines.
Results: The framework leads to the improvement of system modularity through domain-oriented decomposition of services‚ reduced structural coupling through API-level interaction‚ improved reliability through cloud failover‚ and reduced defect density and operational complexity through testing and deployment automation․ By eliminating intermediate messaging layers, it increases event processing efficiency and the system's topological simplicity.
Conclusions: The domain-driven modernization can be a scalable incremental alternative to risky wholesale replacement strategies through encapsulating business logic within a technical architecture conforming to the natural structure of the business domain, lowering the risk of transformation or easing the incremental technical evolution of enterprise systems.
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