Concepts
Why Protean works the way it does: the foundational ideas, the architectural patterns it supports, the design decisions behind them, and the internal machinery underneath.
For factual lookup of specific options, see Reference. For step-by-step instructions, see Guides.
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Philosophy & Principles
The convictions that guide every design decision in Protean.
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Foundations
Core DDD concepts: ubiquitous language, bounded contexts, identity, invariants, streams.
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Architecture Patterns
DDD, CQRS, and Event Sourcing as implemented in Protean.
DDD · CQRS · Event Sourcing
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Building Blocks
What each domain element is, its purpose, and its key characteristics.
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Async Processing
The engine, subscriptions, outbox pattern, priority lanes, and stream categories.
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Observability
Wide events, query-oriented field design, correlation and trace context in logs, high-cardinality backends.
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Ports & Adapters
How Protean separates domain logic from infrastructure through ports and adapters.
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Internals
The field system, shadow fields, query system, and event sourcing mechanics.