Struct ViewContext 

pub struct ViewContext<E, S> { /* private fields */ }

Implementation of the Context trait on top of a DB client implementing crate::store::KeyValueStore.

Implementations

impl<E, S> ViewContext<E, S>

where S: ReadableKeyValueStore + WritableKeyValueStore,

pub async fn create_root_context(store: S, extra: E) -> Result<Self, S::Error>

Creates a context suitable for a root view, using the given store. If the journal’s store is non-empty, it will be cleared first, before the context is returned.

impl<E, S> ViewContext<E, S>

pub fn new_unchecked(store: S, base_key: Vec<u8>, extra: E) -> Self

Creates a context for the given base key, store, and an extra argument. NOTE: this constructor doesn’t check the journal of the store. In doubt, use ViewContext::create_root_context instead.

impl<E> ViewContext<E, MemoryStore>

pub fn new_for_testing(extra: E) -> Self

Creates a Context instance in memory for testing.

Trait Implementations

impl<E: Clone, S: Clone> Clone for ViewContext<E, S>

fn clone(&self) -> ViewContext<E, S>

Returns a duplicate of the value.

fn clone_from(&mut self, source: &Self)

Performs copy-assignment from source.

impl<E, S> Context for ViewContext<E, S>

where E: Clone + AutoTraits, S: ReadableKeyValueStore + WritableKeyValueStore + Clone, S::Error: From<Error> + Send + Sync + Error + 'static,

type Extra = E

User-provided data to be carried along.

type Store = S

The type of the key-value store used by this context.

type Error = <S as WithError>::Error

The type of errors that may be returned by operations on the Store, a convenience alias for <Self::Store as WithError>::Error.

fn store(&self) -> &Self::Store

Getter for the store.

fn extra(&self) -> &E

Getter for the user-provided data.

fn base_key(&self) -> &BaseKey

Getter for the address of the base key.

fn base_key_mut(&mut self) -> &mut BaseKey

Mutable getter for the address of the base key.

fn clone_with_base_key(&self, base_key: Vec<u8>) -> Self

Obtains a similar Context implementation with a different base key.

impl<E, S> Debug for ViewContext<E, S>

where S: Debug, E: Debug,

fn fmt(&self, fmt: &mut Formatter<'_>) -> Result

Formats the value using the given formatter.

impl<E: Default, S: Default> Default for ViewContext<E, S>

fn default() -> ViewContext<E, S>

Returns the “default value” for a type.