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Summary
Mehmet Ozkaya’s introduction to Modular Monolithic Architecture as a middle ground between a traditional monolith and microservices. Each module is independently developed with its own business logic, internal layering, and potentially its own database schema — but the whole application is still deployed as a single process.
Mehmet Ozkaya 關於模塊化單體架構的介紹，作為傳統單體和微服務之間的中間地帶。每個模塊都是獨立開發的，有自己的業務邏輯、內部分層，可能還有自己的數據庫架構——但整個應用程序仍然作為單一進程部署。
Key Points
- Modular Monolith: single deployment unit (monolith) + independent, loosely-coupled modules (DDD bounded contexts) — combines simplicity of monolith with discipline of microservices
- Modules represent bounded contexts: each module encapsulates domain features, internal layering style, and explicit inter-module dependencies only
- Still a single deployment: no distributed systems overhead (no service discovery, distributed tracing, network calls between modules)
- Solves “Lack of Agility” problem of clean architecture: better isolation allows feature teams to work independently within their modules
- Vertical slice architecture complement: modules can be organized by feature slices vertically rather than horizontal layers
- Migration path: modular monolith can be gradually extracted into microservices if/when needed; bounded contexts are already service-sized
Insights
The modular monolith occupies the often-missing middle ground: it enforces the module discipline (explicit dependencies, bounded contexts) that microservices impose, without the distributed systems complexity. For most teams at pre-scale, this is the right answer: it produces microservices-ready architecture without microservices operational overhead. The key discipline is enforcing module boundaries at compile time — inter-module access only through explicit interfaces, not direct class references. This is where frameworks like .NET’s Mediator pattern or Java’s module system (JPMS) come in.
Connections
Raw Excerpt
Modular Monolithic Architecture divides our application logic into modules, and each module will be independent and isolated. Each module should have its own business logic and if necessary its own database or schema. We still build and deploy a single application, but with independent modules for each feature.