AgentSkillsCN

architecture-paradigm-modular-monolith

通过单一可部署的架构，结合模块化边界，既保障团队自主性，又避免分布式架构带来的复杂性。 触发条件：模块化单体、模块边界、单一部署、团队自主性 适用场景：当团队需要在不增加分布式开销的前提下实现自主性时使用。切勿在以下情况下使用此技能：若团队已采用微服务架构，或系统规模较小时——请改用微服务架构。

SKILL.md
--- frontmatter
name: architecture-paradigm-modular-monolith
description: |
  Single deployable with enforced module boundaries for team autonomy without distributed complexity.

  Triggers: modular-monolith, module boundaries, single deployment, team autonomy
  Use when: teams need autonomy without distributed overhead
  DO NOT use when: already using microservices or system is small.
version: 1.4.0
category: architectural-pattern
tags: [architecture, modular-monolith, monolith, internal-boundaries, team-autonomy]
dependencies: []
tools: [dependency-analyzer, module-boundary-enforcer, refactoring-planner]
usage_patterns:
  - paradigm-implementation
  - monolith-modernization
  - team-scaling
complexity: medium
estimated_tokens: 700

The Modular Monolith Paradigm

When To Use

  • •Organizing large codebases into well-bounded modules
  • •Teams wanting microservice boundaries without distributed complexity

When NOT To Use

  • •Already distributed as microservices
  • •Tiny applications where module boundaries add unnecessary complexity

When to Employ This Paradigm

  • •When you desire team autonomy similar to that of microservices, but without the operational overhead of a distributed system.
  • •When release velocity is slowed by tangled dependencies between internal modules.
  • •When a monolithic architecture is simpler to operate today, but there is a clear need to evolve toward a service-based model in the future.

Adoption Steps

  1. •Identify Modules: Define module boundaries that align with distinct business capabilities or Bounded Contexts from Domain-Driven Design.
  2. •Encapsulate Internals: Use language-level visibility modifiers (e.g., public/private), separate packages, or namespaces to hide the implementation details of each module.
  3. •Expose Public Contracts: Each module should expose its functionality through well-defined facades, APIs, or events. Forbid direct database table access or direct implementation calls between modules.
  4. •Enforce Architectural Fitness: Implement automated tests that fail the build if forbidden dependencies or package references are introduced between modules.
  5. •Plan for Evolution: Continuously track metrics such as change coupling and deployment scope to make informed decisions about if and when to split a module into a separate service.

Key Deliverables

  • •An Architecture Decision Record (ADR) that maps module boundaries and defines the rules for any shared code.
  • •Formal contract documentation (e.g., OpenAPI specs, event schemas) for every interaction point between modules.
  • •Automated dependency checks and dedicated CI/CD jobs for each module to enforce boundaries.

Risks & Mitigations

  • •Regression to a "Big Ball of Mud":
    • •Mitigation: Without strict enforcement, module boundaries will inevitably erode. Treat any boundary violation as a build-breaking error and maintain a disciplined approach to code reviews.
  • •Shared Database Hotspots:
    • •Mitigation: High contention on a shared database can become a bottleneck. Introduce clear schema ownership, use view-based access to restrict data visibility, or implement data replication strategies to reduce coupling.

Troubleshooting

Common Issues

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