62 lines
2.1 KiB
Rust
62 lines
2.1 KiB
Rust
/// The pool is one of the main features to be realized in persistence.
|
|
///
|
|
/// Any implementation (database, file storage, memory or others) must be able to get a connection
|
|
/// to manipulate it afterwards.
|
|
pub trait PersistencePool {
|
|
/// `ConnectionClient` implementation that persistence can can return.
|
|
type Conn: ConnectionClient;
|
|
|
|
/// Returns new connection.
|
|
///
|
|
/// # Errors
|
|
///
|
|
/// Returns `PersistenceError` if pool cannot get a connection.
|
|
fn get_connection(&self) -> crate::Result<Self::Conn>;
|
|
}
|
|
|
|
/// Connection client knows about the inner connection, and also knows how to create transactions.
|
|
pub trait ConnectionClient {
|
|
/// Inner connection
|
|
type InnerConn;
|
|
|
|
/// `TransactionClient` implementation in which the connection can be updated.
|
|
///
|
|
/// **Note:** requires nightly rust channel and enabling the `nightly` feature.
|
|
#[cfg(feature = "nightly")]
|
|
type Trx<'t>: TransactionClient;
|
|
|
|
/// Returns inner connection
|
|
fn inner(&mut self) -> &mut Self::InnerConn;
|
|
|
|
/// Updates connection to transaction.
|
|
///
|
|
/// **Note:** requires nightly rust channel and enabling the `nightly` feature.
|
|
///
|
|
/// # Errors
|
|
///
|
|
/// Returns `PersistenceError` if connection cannot update to transaction.
|
|
#[cfg(feature = "nightly")]
|
|
fn start_transaction(&mut self) -> crate::Result<Self::Trx<'_>>;
|
|
}
|
|
|
|
/// Transaction client is updated connection client that can additionally commit and rollback data
|
|
/// in transactions.
|
|
///
|
|
/// **Note:** requires nightly rust channel and enabling the `nightly` feature.
|
|
#[cfg(feature = "nightly")]
|
|
pub trait TransactionClient: ConnectionClient {
|
|
/// Consumes the transaction, committing all changes made within it.
|
|
///
|
|
/// # Errors
|
|
///
|
|
/// Returns `PersistenceError` if transaction cannot commit
|
|
fn commit(self) -> crate::Result<()>;
|
|
|
|
/// Rolls the transaction back, discarding all changes made within it.
|
|
///
|
|
/// # Errors
|
|
///
|
|
/// Returns `PersistenceError` if transaction cannot rolls back.
|
|
fn rollback(self) -> crate::Result<()>;
|
|
}
|