Struct tetsy_kvdb_memorydb::InMemory

pub struct InMemory { /* fields omitted */ }

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 Default for InMemory

fn default() -> InMemory

Returns the “default value” for a type.

impl KeyValueDB for InMemory

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

Get a value by key.

fn get_by_prefix(&self, col: u32, prefix: &[u8]) -> Option<Box<[u8]>>

Get a value by partial key. Only works for flushed data.

fn write_buffered(&self, transaction: DBTransaction)

Write a transaction of changes to the buffer.

fn flush(&self) -> Result<()>

Flush all buffered data.

fn iter<'a>(
    &'a self,
    col: u32
) -> Box<dyn Iterator<Item = (Box<[u8]>, Box<[u8]>)> + 'a>

Iterate over flushed data for a given column.

fn iter_from_prefix<'a>(
    &'a self,
    col: u32,
    prefix: &'a [u8]
) -> Box<dyn Iterator<Item = (Box<[u8]>, Box<[u8]>)> + 'a>

Iterate over flushed data for a given column, starting from a given prefix.

fn restore(&self, _new_db: &str) -> Result<()>

Attempt to replace this database with a new one located at the given path.

pub fn transaction(&self) -> DBTransaction

Helper to create a new transaction.

pub fn write(&self, transaction: DBTransaction) -> Result<(), Error>

Write a transaction of changes to the backing store.

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

Query statistics.

impl MallocSizeOf for InMemory

fn size_of(&self, ops: &mut MallocSizeOfOps) -> usize

Measure the heap usage of all descendant heap-allocated structures, but not the space taken up by the value itself.