from dataclasses import dataclass
import asyncio
import numpy as np

class UnlimitedSemaphore:
    """A context manager that allows unlimited access."""

    async def __aenter__(self):
        pass

    async def __aexit__(self, exc_type, exc, tb):
        pass

@dataclass
class EmbeddingFunc:
    embedding_dim: int
    max_token_size: int
    func: callable
    concurrent_limit: int = 16

    def __post_init__(self):
        if self.concurrent_limit != 0:
            self._semaphore = asyncio.Semaphore(self.concurrent_limit)
        else:
            self._semaphore = UnlimitedSemaphore()

    async def __call__(self, *args, **kwargs) -> np.ndarray:
        async with self._semaphore:
            return await self.func(*args, **kwargs)