Trait ManifestStore 

pub trait ManifestStore: Send + Sync {
    type Error: Error + Send + Sync + 'static;

    // Required methods
    fn get_root(&self, name: &[u8]) -> Result<Option<RootManifest>, Self::Error>;
    fn put_root(
        &self,
        name: &[u8],
        manifest: &RootManifest,
    ) -> Result<(), Self::Error>;
    fn delete_root(&self, name: &[u8]) -> Result<(), Self::Error>;
    fn compare_and_swap_root(
        &self,
        name: &[u8],
        expected: Option<&RootManifest>,
        new: Option<&RootManifest>,
    ) -> Result<ManifestUpdate, Self::Error>;
}

Storage for named root manifests.

This trait is separate from crate::Store so content-addressed node stores remain simple. Backends that can update a named root atomically should implement compare-and-swap directly in their native transaction mechanism.

Required Associated Types

type Error: Error + Send + Sync + 'static

Error type for manifest operations.

Required Methods

fn get_root(&self, name: &[u8]) -> Result<Option<RootManifest>, Self::Error>

Load a named root manifest.

fn put_root( &self, name: &[u8], manifest: &RootManifest, ) -> Result<(), Self::Error>

Unconditionally insert or replace a named root manifest.

fn delete_root(&self, name: &[u8]) -> Result<(), Self::Error>

Delete a named root manifest. Deleting a missing name is not an error.

fn compare_and_swap_root( &self, name: &[u8], expected: Option<&RootManifest>, new: Option<&RootManifest>, ) -> Result<ManifestUpdate, Self::Error>

Atomically update a named root if the current manifest matches expected.

expected == None means the name must be absent. new == None deletes the name when the compare succeeds.

Dyn Compatibility

This trait is dyn compatible.

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

Implementations on Foreign Types

impl<T: ManifestStore> ManifestStore for Arc<T>

type Error = <T as ManifestStore>::Error

fn get_root(&self, name: &[u8]) -> Result<Option<RootManifest>, Self::Error>

fn put_root( &self, name: &[u8], manifest: &RootManifest, ) -> Result<(), Self::Error>

fn delete_root(&self, name: &[u8]) -> Result<(), Self::Error>

fn compare_and_swap_root( &self, name: &[u8], expected: Option<&RootManifest>, new: Option<&RootManifest>, ) -> Result<ManifestUpdate, Self::Error>

Implementors

impl ManifestStore for FileNodeStore

type Error = FileNodeStoreError

impl ManifestStore for MemStore

type Error = MemStoreError

impl<S> ManifestStore for OwnedTransactionOverlayStore<S>

where S: Store + ManifestStore,

type Error = TransactionOverlayError