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:
| Backend | Adapter Crate |
|---|---|
| tokio-postgres | bb8-postgres (in-tree) |
| redis | bb8-redis (in-tree) |
| redis_cluster_async | bb8-redis-cluster |
| rsmq | rsmq_async |
| bolt-client | bb8-bolt |
| diesel | bb8-diesel |
| tiberius | bb8-tiberius |
| nebula-client | bb8-nebula |
| memcache-async | bb8-memcached |
| lapin | bb8-lapin |
| arangors | bb8-arangodb |
Using an imaginary "foodb" database.
#[tokio::main]
async fn main() {
let manager = bb8_foodb::FooConnectionManager::new("localhost:1234");
let pool = bb8::Pool::builder()
.max_size(15)
.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.
});
}
}Licensed under the MIT license (LICENSE).
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