Trait NativeLogStorage 

pub trait NativeLogStorage: Send + Sync {
    // Required methods
    fn read_version(
        &self,
        name: &str,
        version: u64,
    ) -> Result<Option<Vec<u8>>, LogError>;
    fn cas_version(
        &self,
        name: &str,
        version: u64,
        expected: Option<&[u8]>,
        new: &[u8],
    ) -> Result<(), LogError>;
    fn versions(&self, name: &str) -> Result<Vec<u64>, LogError>;
    fn delete_versions(&self, name: &str) -> Result<(), LogError>;
}

Synchronous byte store for versioned transaction-log objects.

Implementations usually adapt the same native storage system used for blobs and roots. Each object is one lease-version log for one database.

Required Methods

fn read_version( &self, name: &str, version: u64, ) -> Result<Option<Vec<u8>>, LogError>

Reads the encoded bytes for name and version.

Errors

Returns an error when the native backend cannot read the version object or when backend data cannot be represented as log bytes.

fn cas_version( &self, name: &str, version: u64, expected: Option<&[u8]>, new: &[u8], ) -> Result<(), LogError>

Compare-and-swap writes encoded bytes for name and version.

Errors

Returns an error when the compare-and-swap fails, the native backend cannot publish the version object, or the backend reports invalid data.

fn versions(&self, name: &str) -> Result<Vec<u64>, LogError>

Lists versions present for name, sorted ascending.

Errors

Returns an error when the native backend cannot enumerate version objects or returns an invalid version identifier.

fn delete_versions(&self, name: &str) -> Result<(), LogError>

Deletes all versions for name.

Errors

Returns an error when the native backend cannot remove a version object.

Dyn Compatibility

This trait is dyn compatible.

In older versions of Rust, dyn compatibility was called "object safety".

Implementors