r2d2

A generic connection pool for Rust.

Documentation

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.

r2d2 is agnostic to the connection type it is managing. Implementors of the ConnectionManager trait provide the database-specific logic to create and check the health of connections.

The r2d2-postgres crate provides a ConnectionManager for rust-postgres.

Example

Using a fake "foodb" database. ```rust use std::thread; use std::sync::Arc;

extern crate r2d2; extern crate r2d2_foodb;

fn main() { let config = r2d2::Config::default(); let manager = r2d2foodb::FooConnectionManager::new("localhost:1234"); let errorhandler = Box::new(r2d2::LoggingErrorHandler);

let pool = Arc::new(r2d2::Pool::new(config, manager, error_handler).unwrap());

for _ in 0..20i32 {
    let pool = pool.clone();
    thread::spawn(move || {
        let conn = pool.get().unwrap();
        // use the connection
        // it will be returned to the pool when it falls out of scope.
    })
}

} ```