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Microservices patterns

Service boundaries, discovery, inter-service calls, and decomposition patterns.

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Microservices patterns medium

CQRS with Separate Read and Write Repositories in Python

Implement CQRS in Python with separate write and read repositories, using commands for mutations and frozen DTOs for queries.

cqrs repositories microservices
Python 
from dataclasses import dataclass
from typing import Dict, List, Optional


# --- Write side: commands mutate state ---
@dataclass
class CreateUserCommand:
    id: int
    name: str


class UserWriteRepository:
    def __init__(self) -> None:
        self._store: Dict[int, Dict[str, object]] = {}

    def create(self,…
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