Trait Store 

pub trait Store: Send + Sync {
    type Error: StdError + Send + Sync + 'static;

    // Required methods
    fn get(&self, key: &[u8]) -> Result<Option<Vec<u8>>, Self::Error>;
    fn seek(&self, from: &[u8]) -> Result<Option<KeyValue>, Self::Error>;
    fn seek_back(&self, upto: &[u8]) -> Result<Option<KeyValue>, Self::Error>;
    fn commit(&self, ops: &[Op<'_>], durable: bool) -> Result<(), Self::Error>;
}

An ordered key/value byte store: the durable substrate under the queue.

Keys sort lexicographically. The queue needs forward and backward seeks and one atomic, optionally durable, batch write; it never asks the store to know anything about queues.

Required Associated Types

type Error: StdError + Send + Sync + 'static

The backend’s error type.

Required Methods

fn get(&self, key: &[u8]) -> Result<Option<Vec<u8>>, Self::Error>

Value for an exact key.

fn seek(&self, from: &[u8]) -> Result<Option<KeyValue>, Self::Error>

Smallest entry whose key is >= from.

fn seek_back(&self, upto: &[u8]) -> Result<Option<KeyValue>, Self::Error>

Greatest entry whose key is <= upto.

fn commit(&self, ops: &[Op<'_>], durable: bool) -> Result<(), Self::Error>

Apply ops. When durable, do not return until they survive a crash.

Dyn Compatibility

This trait is dyn compatible.

In older versions of Rust, dyn compatibility was called "object safety".

Implementors

impl Store for MemStore

type Error = !