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Microservices patterns

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

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Microservices patterns easy

How to Implement an Exactly-Once Deduplication Store in Python

Implement a Python class that deduplicates keys exactly once, tracking first-seen timestamps and duplicate counts.

deduplication exactly-once set
Python 
from datetime import datetime
from typing import Any, Hashable


class ExactlyOnceStore:
    def __init__(self) -> None:
        self._seen: set[Hashable] = set()
        self._first_seen: dict[Hashable, datetime] = {}
        self._counts: dict[Hashable, int] = {}

    def add(self, key: Hashable, value: Any = None) …
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