Trait JournalBackend 

pub trait JournalBackend: Send + Sync {
    // Required methods
    fn acquire_lease(&self) -> Result<Lease, JournalError>;
    fn read_state(&self) -> Result<StoredState, JournalError>;
    fn admit(&self, admission: Admission) -> Result<JournalHead, JournalError>;
    fn put_datum(
        &self,
        object: JournalObject,
    ) -> Result<StoredDatumRef, JournalError>;
    fn get_datum(&self, meaning: &ContentId) -> Result<Datum, JournalError>;
    fn rebuild_datum_index(&self) -> Result<Vec<StoredDatumRef>, JournalError>;
}

Object-safe storage seam. A Table backend implements admit with canonical table/cas; it must refuse writes unless CAS and durability are provable.

Required Methods

fn acquire_lease(&self) -> Result<Lease, JournalError>

fn read_state(&self) -> Result<StoredState, JournalError>

fn admit(&self, admission: Admission) -> Result<JournalHead, JournalError>

fn put_datum( &self, object: JournalObject, ) -> Result<StoredDatumRef, JournalError>

Durably publishes one immutable semantic object without making it a journal retention root.

fn get_datum(&self, meaning: &ContentId) -> Result<Datum, JournalError>

Resolves one semantic object by meaning, returning an owned Datum.

fn rebuild_datum_index(&self) -> Result<Vec<StoredDatumRef>, JournalError>

Rebuilds and verifies the derived semantic-to-storage correspondence.

Dyn Compatibility

This trait is dyn compatible.

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

Implementations on Foreign Types

impl<T: JournalBackend + ?Sized> JournalBackend for Arc<T>

fn acquire_lease(&self) -> Result<Lease, JournalError>

fn read_state(&self) -> Result<StoredState, JournalError>

fn admit(&self, admission: Admission) -> Result<JournalHead, JournalError>

fn put_datum( &self, object: JournalObject, ) -> Result<StoredDatumRef, JournalError>

fn get_datum(&self, meaning: &ContentId) -> Result<Datum, JournalError>

fn rebuild_datum_index(&self) -> Result<Vec<StoredDatumRef>, JournalError>

Implementors

impl JournalBackend for HostDirJournalBackend

impl JournalBackend for MemoryBackend