Struct HistoricallyHashableView

pub struct HistoricallyHashableView<C, W> { /* private fields */ }

Wrapper to compute the hash of the view based on its history of modifications.

Implementations

impl<W: ClonableView> HistoricallyHashableView<W::Context, W>

pub async fn historical_hash(&mut self) -> Result<HasherOutput, ViewError>

Obtains a hash of the history of the changes in the view.

Trait Implementations

impl<W> ClonableView for HistoricallyHashableView<W::Context, W>

where W: ClonableView,

fn clone_unchecked(&mut self) -> Result<Self, ViewError>

Creates a clone of this view, sharing the underlying storage context but prone to data races which can corrupt the view state.

impl<C: Debug, W: Debug> Debug for HistoricallyHashableView<C, W>

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

Formats the value using the given formatter.

impl<C, W> Deref for HistoricallyHashableView<C, W>

type Target = W

The resulting type after dereferencing.

fn deref(&self) -> &W

Dereferences the value.

impl<C, W> DerefMut for HistoricallyHashableView<C, W>

fn deref_mut(&mut self) -> &mut W

Mutably dereferences the value.

impl<C, W> OutputType for HistoricallyHashableView<C, W>

where C: Context, W: OutputType + Send + Sync,

fn type_name() -> Cow<'static, str>

Type the name.

fn qualified_type_name() -> String

Qualified typename.

fn create_type_info(registry: &mut Registry) -> String

Create type information in the registry and return qualified typename.

async fn resolve( &self, ctx: &ContextSelectionSet<'_>, field: &Positioned<Field>, ) -> ServerResult<Value>

Resolve an output value to async_graphql::Value.

fn introspection_type_name(&self) -> Cow<'static, str>

Introspection type name

impl<C, W, C2> ReplaceContext<C2> for HistoricallyHashableView<C, W>

where W: View<Context = C> + ReplaceContext<C2>, C: Context, C2: Context,

type Target = HistoricallyHashableView<C2, <W as ReplaceContext<C2>>::Target>

The type returned after replacing the context.

async fn with_context( &mut self, ctx: impl FnOnce(&Self::Context) -> C2 + Clone, ) -> Self::Target

Returns a view with a replaced context.

impl<W> View for HistoricallyHashableView<W::Context, W>

where W: View,

const NUM_INIT_KEYS: usize

The number of keys used for the initialization

type Context = <W as View>::Context

The type of context stored in this view

fn context(&self) -> &Self::Context

Obtains a mutable reference to the internal context.

fn pre_load(context: &Self::Context) -> Result<Vec<Vec<u8>>, ViewError>

Creates the keys needed for loading the view

fn post_load( context: Self::Context, values: &[Option<Vec<u8>>], ) -> Result<Self, ViewError>

Loads a view from the values

async fn load(context: Self::Context) -> Result<Self, ViewError>

Loads a view

fn rollback(&mut self)

Discards all pending changes. After that flush should have no effect to storage.

async fn has_pending_changes(&self) -> bool

Returns true if flushing this view would result in changes to the persistent storage.

fn flush(&mut self, batch: &mut Batch) -> Result<bool, ViewError>

Persists changes to storage. This leaves the view still usable and is essentially neutral to the program running. Crash-resistant storage implementations are expected to accumulate the desired changes in the batch variable first. If the view is dropped without calling flush, staged changes are simply lost. The returned boolean indicates whether the operation removes the view or not.

fn clear(&mut self)

Clears the view. That can be seen as resetting to default. If the clear is followed by a flush then all the relevant data is removed on the storage.

fn new(context: Self::Context) -> Result<Self, ViewError>

Builds a trivial view that is already deleted