cqrs_bus.md

cqrs bus

Language: Python · Sphere: programming · Category: Architecture

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What it does

Simple CQRS Command/Query Splitter Module

This module implements a basic Command Query Responsibility Segregation (CQRS) pattern with separate buses for commands and queries, handler registration, and dispatch mechanisms.

Guarantee

When it runs, cqrs bus guarantees sum((1 for e in events if '@' in e.email)) == 2; len(events) == 2; events[0].name == 'Alice Johnson' and events[0].email == 'alice@example.com' (proven by run).

Checkable constraints:

• len(events) == 2
• events[0].name == 'Alice Johnson' and events[0].email == 'alice@example.com'
• events[1].name == 'Bob Wilson'
• sum((1 for e in events if '@' in e.email)) == 2
• events[0].user_id == c1.id and events[1].user_id == c2.id
• c1.id != c2.id
• r1 == {'name': 'John Doe', 'email': 'john@example.com'}
• r2['name'] == 'Jane Smith'

Verification evidence

• Green-run: ✓ passes (re-run under the extractor's gate)
• Constraint strength: recovery (truth-pinned)
• Independent oracle: ✓ consensus — xlang (validator v1.9)
• Peer review: unreviewed

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