Reference library

Streaming & messaging

Kafka-style pub/sub, event consumers, async pipelines, and message-driven workflows.

3 matches

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.

outbox polling messaging

Python

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…

11 0 Open

Streaming & messaging medium

How to Track Session Windows with Gap Timeout in Python

A Python class that groups events into sessions, closing a session when the gap between events exceeds a timeout threshold.

session-window streaming timeout

Python

import time

class SessionWindow:
    """Track sessions with a gap timeout (mock)."""
    
    def __init__(self, timeout_seconds=5):
        self.timeout = timeout_seconds
        self.session_start = None
        self.last_event_time = None
        self.event_count = 0
        self.events = []
    
    def add_event…

13 0 Open

Streaming & messaging medium

Simulate RabbitMQ QoS Prefetch Count in Python

Mocks RabbitMQ QoS prefetch semantics using threading and a queue to cap concurrent unacked message processing per worker.

rabbitmq threading qos

Python

import threading
import time
import queue


class RabbitMQMock:
    def __init__(self, prefetch_count=1):
        self.prefetch_count = prefetch_count
        self.channel_queue = queue.Queue()
        self.currently_processing = 0
        self.lock = threading.Lock()

    def start_consuming(self, messages, worker_co…

13 0 Open

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