Streaming & messaging
Kafka-style pub/sub, event consumers, async pipelines, and message-driven workflows.
How to Implement an Outbox Table Poll Publisher in Python
This code simulates an outbox pattern with a class that polls for pending records and publishes them as JSON messages, removing only those that are due.
import time
import json
from dataclasses import dataclass, asdict
from datetime import datetime, timedelta
@dataclass
class OutboxRecord:
id: int
topic: str
payload: dict
created_at: datetime
class OutboxPollPublisher:
def __init__(self, poll_interval_seconds=1):
self.poll_interval = poll…How to mock a CQRS projector read model update in Python
Build a CQRS projector class that maintains denormalized read models by applying domain events in a mock order-processing service.
from dataclasses import dataclass, field
from typing import Dict, List, Optional
@dataclass
class OrderReadModel:
order_id: str
customer_name: str
total: float
status: str = "pending"
items: List[Dict] = field(default_factory=list)
def apply_event(self, event_type: str, payload: Dict) -> Non…Browse by section
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Streaming & messaging — Python code examples
What you will find here
This page collects streaming & messaging snippets — short, copy-ready Python you can paste into our free online IDE and run without installing anything. Each sample includes a plain-English explanation and the full source code.
Samples vs tutorials and challenges
Samples are quick reference — one concept per page. For step-by-step teaching, use our Python tutorials. To test yourself, try quizzes or coding challenges. Clean up style with the Python formatter.