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Streaming & messaging

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

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Streaming & messaging medium

Implement a retry queue with visibility timeout in Python

This code simulates a message queue with a visibility timeout, allowing messages to be retried if not deleted before the timeout expires.

queue retry visibility-timeout
Python 
import time
from collections import deque


class SimpleQueue:
    def __init__(self, visibility_timeout=2):
        self.queue = deque()
        self.in_flight = {}
        self.visibility_timeout = visibility_timeout

    def send(self, message):
        self.queue.append(message)

    def receive(self):
        if …
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