Struct StorageInternalCache

pub struct StorageInternalCache {
    pub tx_cache: CacheLog,
    pub ordered_db_reads: Vec<(CacheKey, Option<CacheValue>)>,
}

Caches reads and writes for a (key, value) pair. On the first read the value is fetched from an external source represented by the ValueReader trait. On following reads, the cache checks if the value we read was inserted before.

Fields

tx_cache: CacheLog

Transaction cache.

ordered_db_reads: Vec<(CacheKey, Option<CacheValue>)>

Ordered reads and writes.

Implementations

impl StorageInternalCache

pub fn get_or_fetch<S: Storage>( &mut self, key: &StorageKey, value_reader: &S, witness: &S::Witness, ) -> Option<StorageValue>

Gets a value from the cache or reads it from the provided ValueReader.

pub fn try_get(&self, key: &StorageKey) -> ValueExists

Gets a keyed value from the cache, returning a wrapper on whether it exists.

pub fn set(&mut self, key: &StorageKey, value: StorageValue)

Replaces the keyed value on the storage.

pub fn delete(&mut self, key: &StorageKey)

Deletes a keyed value from the cache.

pub fn merge_left(&mut self, rhs: Self) -> Result<(), MergeError>

Merges the provided StorageInternalCache into this one.

pub fn merge_reads_left(&mut self, rhs: Self) -> Result<(), MergeError>

Merges the reads of the provided StorageInternalCache into this one.

pub fn merge_writes_left(&mut self, rhs: Self) -> Result<(), MergeError>

Merges the writes of the provided StorageInternalCache into this one.

Trait Implementations

impl Default for StorageInternalCache

fn default() -> StorageInternalCache

Returns the “default value” for a type.

impl From<StorageInternalCache> for CacheLog

fn from(val: StorageInternalCache) -> Self

Converts to this type from the input type.

impl From<StorageInternalCache> for OrderedReadsAndWrites

fn from(val: StorageInternalCache) -> Self

Converts to this type from the input type.