Struct InMemory 

pub struct InMemory { /* private fields */ }

A key-value database fulfilling the KeyValueDB trait, living in memory. This is generally intended for tests and is not particularly optimized.

Trait Implementations

impl Clone for InMemory

fn clone(&self) -> InMemory

Returns a duplicate of the value.

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

Performs copy-assignment from source.

impl KeyValueDB for InMemory

fn delete<'a>( &'a self, col: u32, key: &'a [u8], ) -> KeyValueDBPinBoxFuture<'a, Result<Option<DBValue>>>

Remove a value by key, returning the old value

fn get<'a>( &'a self, col: u32, key: &'a [u8], ) -> KeyValueDBPinBoxFuture<'a, Result<Option<DBValue>>>

Get a value by key.

fn write( &self, transaction: DBTransaction, ) -> KeyValueDBPinBoxFuture<'_, Result<(), DBTransactionError>>

Write a transaction of changes to the backing store.

fn iter<'a, T: Send + 'static, C: Send + 'static, F: FnMut(&mut C, DBKeyValueRef<'_>) -> Result<Option<T>> + Send + Sync + 'static>( &'a self, col: u32, prefix: Option<&'a [u8]>, context: C, f: F, ) -> KeyValueDBPinBoxFuture<'a, Result<(C, Option<T>)>>

Iterate over the data for a given column. Return all key/value pairs, optionally where the key starts with the given prefix. Iterator closure returns true for more items, false to stop iteration.

fn iter_keys<'a, T: Send + 'static, C: Send + 'static, F: FnMut(&mut C, DBKeyRef<'_>) -> Result<Option<T>> + Send + Sync + 'static>( &'a self, col: u32, prefix: Option<&'a [u8]>, context: C, f: F, ) -> KeyValueDBPinBoxFuture<'a, Result<(C, Option<T>)>>

Iterate over the data for a given column. Return all keys, optionally where the key starts with the given prefix. Iterator closure returns true for more items, false to stop iteration.

fn num_columns(&self) -> Result<u32>

The number of column families in the db.

fn num_keys(&self, col: u32) -> KeyValueDBPinBoxFuture<'_, Result<u64>>

The number of keys in a column (estimated).

fn transaction(&self) -> DBTransaction

Helper to create a new transaction.

fn io_stats(&self, _kind: Kind) -> IoStats

Query statistics.

fn has_key<'a>( &'a self, col: u32, key: &'a [u8], ) -> Pin<Box<dyn Future<Output = Result<bool, Error>> + Send + 'a>>

Check for the existence of a value by key.

fn has_prefix<'a>( &'a self, col: u32, prefix: &'a [u8], ) -> Pin<Box<dyn Future<Output = Result<bool, Error>> + Send + 'a>>

Check for the existence of a value by prefix.

fn first_with_prefix<'a>( &'a self, col: u32, prefix: &'a [u8], ) -> Pin<Box<dyn Future<Output = Result<Option<(Vec<u8>, Vec<u8>)>, Error>> + Send + 'a>>

Get the first value matching the given prefix.

fn cleanup( &self, ) -> Pin<Box<dyn Future<Output = Result<(), Error>> + Send + '_>>

Cleanup/Vacuum database