Reference library

Reliability & rate limiting

Retries, exponential backoff, circuit breakers, token buckets, and idempotent handlers.

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Reliability & rate limiting easy

Exactly Once Processing Dedupe Mock in Python

Implements a streaming deduplicator using a set and queue to guarantee each item is processed exactly once while preserving insertion order.

deduplication exactly-once streaming
Python 
from collections import deque

class DedupeStream:
    def __init__(self):
        self.seen = set()
        self.queue = deque()

    def add(self, item):
        if item not in self.seen:
            self.seen.add(item)
            self.queue.append(item)
            print(f"Processed: {item} (exactly once)")
      …
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