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//! A full-featured connection pool, designed for asynchronous connections
//! (using tokio). Originally based on [r2d2](https://github.com/sfackler/r2d2).
//!
//! Opening a new database connection every time one is needed is both
//! inefficient and can lead to resource exhaustion under high traffic
//! conditions. A connection pool maintains a set of open connections to a
//! database, handing them out for repeated use.
//!
//! bb8 is agnostic to the connection type it is managing. Implementors of the
//! `ManageConnection` trait provide the database-specific logic to create and
//! check the health of connections.
//!
//! # Example
//!
//! Using an imaginary "foodb" database.
//!
//! ```ignore
//! #[tokio::main]
//! async fn main() {
//! let manager = bb8_foodb::FooConnectionManager::new("localhost:1234");
//! let pool = bb8::Pool::builder().build(manager).await.unwrap();
//!
//! for _ in 0..20 {
//! let pool = pool.clone();
//! tokio::spawn(async move {
//! let conn = pool.get().await.unwrap();
//! // use the connection
//! // it will be returned to the pool when it falls out of scope.
//! });
//! }
//! }
//! ```
pub use ;