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// Copyright (c) 2026 vectorless developers
// SPDX-License-Identifier: Apache-2.0
//! Concurrency control for LLM API calls.
//!
//! This module provides rate limiting and concurrency control to prevent
//! overwhelming LLM API endpoints:
//!
//! - **Rate Limiter** — Token bucket algorithm to limit requests per time period
//! - **Concurrency Controller** — Combined semaphore + rate limiter
//!
//!
//! # Example
//!
//! ```rust
//! use vectorless::throttle::{ConcurrencyController, ConcurrencyConfig};
//!
//! # #[tokio::main]
//! # async fn main() {
//! // Create with default configuration
//! let controller = ConcurrencyController::with_defaults();
//!
//! // Or customize
//! let config = ConcurrencyConfig::new()
//! .with_max_concurrent_requests(20)
//! .with_requests_per_minute(1000);
//! let controller = ConcurrencyController::new(config);
//!
//! // Before making an API call
//! let permit = controller.acquire().await;
//!
//! // Make the API call...
//! // Permit is automatically released when dropped
//! # }
//! ```
pub use ConcurrencyConfig;
pub use ConcurrencyController;