Trait StorageBackend 

pub trait StorageBackend:
    'static
    + Debug
    + Send
    + Sync {
    // Required methods
    fn len(&self) -> Result<u64, Error>;
    fn read(&self, offset: u64, out: &mut [u8]) -> Result<(), Error>;
    fn set_len(&self, len: u64) -> Result<(), Error>;
    fn sync_data(&self) -> Result<(), Error>;
    fn write(&self, offset: u64, data: &[u8]) -> Result<(), Error>;

    // Provided method
    fn close(&self) -> Result<(), Error> { ... }
}

Implements persistent storage for a database.

Required Methods

fn len(&self) -> Result<u64, Error>

Gets the current length of the storage.

fn read(&self, offset: u64, out: &mut [u8]) -> Result<(), Error>

Reads the specified array of bytes from the storage.

If out.len() + offset exceeds the length of the storage an appropriate Error must be returned.

fn set_len(&self, len: u64) -> Result<(), Error>

Sets the length of the storage.

New positions in the storage must be initialized to zero.

fn sync_data(&self) -> Result<(), Error>

Syncs all buffered data with the persistent storage.

fn write(&self, offset: u64, data: &[u8]) -> Result<(), Error>

Writes the specified array to the storage.

Provided Methods

fn close(&self) -> Result<(), Error>

Release any resources held by the backend

Note: redb will not access the backend after calling this method and will call it exactly once when the Database is dropped

Implementors

impl StorageBackend for FileBackend

impl StorageBackend for InMemoryBackend