A full-featured connection pool, designed for asynchronous connections (using tokio). Originally based on 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.

A (possibly not exhaustive) list of adapters for different backends:

Using an imaginary "foodb" database.

#[tokio::main]asyncfnmain(){let manager = bb8_foodb::FooConnectionManager::new("localhost:1234");let pool = bb8::Pool::builder().max_size(15).build(manager).await.unwrap();for _ in0..20{let pool = pool.clone(); tokio::spawn(asyncmove{let conn = pool.get().await.unwrap();// use the connection// it will be returned to the pool when it falls out of scope.});}}

Licensed under the MIT license (LICENSE).

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