pub struct StateViewCache<'a> { /* private fields */ }
Expand description

A local cache for a given a StateView. The cache is private to the Diem layer but can be used as a one shot cache for systems that need a simple RemoteCache implementation (e.g. tests or benchmarks).

The cache is responsible to track all changes to the StateView that are the result of transaction execution. Those side effects are published at the end of a transaction execution via StateViewCache::push_write_set.

StateViewCache is responsible to give an up to date view over the data store, so that changes executed but not yet committed are visible to subsequent transactions.

If a system wishes to execute a block of transaction on a given view, a cache that keeps track of incremental changes is vital to the consistency of the data store and the system.

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impl<'a> StateViewCache<'a>

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pub fn new(data_view: &'a dyn StateView) -> Self

Create a StateViewCache give a StateView. Hold updates to the data store and forward data request to the StateView if not in the local cache.

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impl<'block> ConfigStorage for StateViewCache<'block>

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fn fetch_config(&self, access_path: AccessPath) -> Option<Vec<u8>>

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impl<'block> ModuleResolver for StateViewCache<'block>

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type Error = VMError

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fn get_module( &self, module_id: &ModuleId ) -> Result<Option<Vec<u8>>, Self::Error>

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impl<'block> ResourceResolver for StateViewCache<'block>

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type Error = VMError

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fn get_resource( &self, address: &AccountAddress, tag: &StructTag ) -> Result<Option<Vec<u8>>, Self::Error>

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impl<'block> StateView for StateViewCache<'block>

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fn get(&self, access_path: &AccessPath) -> Result<Option<Vec<u8>>>

Gets the state for a single access path.
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fn is_genesis(&self) -> bool

VM needs this method to know whether the current state view is for genesis state creation. Currently TransactionPayload::WriteSet is only valid for genesis state creation.
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fn id(&self) -> StateViewId

For logging and debugging purpose, identifies what this view is for.

Auto Trait Implementations§

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impl<'a> !RefUnwindSafe for StateViewCache<'a>

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impl<'a> Send for StateViewCache<'a>

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impl<'a> Sync for StateViewCache<'a>

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impl<'a> Unpin for StateViewCache<'a>

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impl<'a> !UnwindSafe for StateViewCache<'a>

Blanket Implementations§

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impl<T> Any for Twhere T: 'static + ?Sized,

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fn type_id(&self) -> TypeId

Gets the TypeId of self. Read more
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impl<T> Borrow<T> for Twhere T: ?Sized,

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fn borrow(&self) -> &T

Immutably borrows from an owned value. Read more
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impl<T> BorrowMut<T> for Twhere T: ?Sized,

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fn borrow_mut(&mut self) -> &mut T

Mutably borrows from an owned value. Read more
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impl<T> From<T> for T

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fn from(t: T) -> T

Returns the argument unchanged.

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impl<T> Instrument for T

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fn instrument(self, span: Span) -> Instrumented<Self>

Instruments this type with the provided Span, returning an Instrumented wrapper. Read more
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fn in_current_span(self) -> Instrumented<Self>

Instruments this type with the current Span, returning an Instrumented wrapper. Read more
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impl<T, U> Into<U> for Twhere U: From<T>,

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fn into(self) -> U

Calls U::from(self).

That is, this conversion is whatever the implementation of From<T> for U chooses to do.

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impl<E, T> MoveResolver for Twhere T: ModuleResolver<Error = E> + ResourceResolver<Error = E> + ?Sized, E: Debug,

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type Err = E

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impl<T> Pointable for T

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const ALIGN: usize = mem::align_of::<T>()

The alignment of pointer.
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type Init = T

The type for initializers.
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unsafe fn init(init: <T as Pointable>::Init) -> usize

Initializes a with the given initializer. Read more
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unsafe fn deref<'a>(ptr: usize) -> &'a T

Dereferences the given pointer. Read more
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unsafe fn deref_mut<'a>(ptr: usize) -> &'a mut T

Mutably dereferences the given pointer. Read more
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unsafe fn drop(ptr: usize)

Drops the object pointed to by the given pointer. Read more
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impl<T> Same<T> for T

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type Output = T

Should always be Self
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impl<T, U> TryFrom<U> for Twhere U: Into<T>,

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type Error = Infallible

The type returned in the event of a conversion error.
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fn try_from(value: U) -> Result<T, <T as TryFrom<U>>::Error>

Performs the conversion.
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impl<T, U> TryInto<U> for Twhere U: TryFrom<T>,

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type Error = <U as TryFrom<T>>::Error

The type returned in the event of a conversion error.
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fn try_into(self) -> Result<U, <U as TryFrom<T>>::Error>

Performs the conversion.
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impl<V, T> VZip<V> for Twhere V: MultiLane<T>,

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fn vzip(self) -> V

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impl<T> WithSubscriber for T

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fn with_subscriber<S>(self, subscriber: S) -> WithDispatch<Self>where S: Into<Dispatch>,

Attaches the provided Subscriber to this type, returning a WithDispatch wrapper. Read more
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fn with_current_subscriber(self) -> WithDispatch<Self>

Attaches the current default Subscriber to this type, returning a WithDispatch wrapper. Read more