"""
Memory Server implementation.

This module provides a simple in-memory key-value store server that can be used for testing or as a lightweight cache.
"""

from typing import Dict, Any
import json

class MemoryServer:
    """A very small in-memory key‑value store."""

    def __init__(self) -> None:
        self._store: Dict[str, Any] = {}

    def set(self, key: str, value: Any) -> None:
        self._store[key] = value

    def get(self, key: str) -> Any:
        return self._store[key]

    def delete(self, key: str) -> None:
        del self._store[key]

    def dump(self) -> str:
        return json.dumps(self._store)

    @classmethod
    def load(cls, data: str) -> "MemoryServer":
        obj = cls()
        obj._store = json.loads(data)
        return obj

if __name__ == "__main__":
    srv = MemoryServer()
    srv.set("foo", 42)
    print(srv.get("foo"))
    print(srv.dump())