43 lines
1.5 KiB
Rust
43 lines
1.5 KiB
Rust
// Copyright 2015, 2016 Ethcore (UK) Ltd.
|
|
// This file is part of Parity.
|
|
|
|
// Parity is free software: you can redistribute it and/or modify
|
|
// it under the terms of the GNU General Public License as published by
|
|
// the Free Software Foundation, either version 3 of the License, or
|
|
// (at your option) any later version.
|
|
|
|
// Parity is distributed in the hope that it will be useful,
|
|
// but WITHOUT ANY WARRANTY; without even the implied warranty of
|
|
// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
|
|
// GNU General Public License for more details.
|
|
|
|
// You should have received a copy of the GNU General Public License
|
|
// along with Parity. If not, see <http://www.gnu.org/licenses/>.
|
|
|
|
//! Disk-backed HashDB implementation.
|
|
|
|
use common::*;
|
|
use hashdb::*;
|
|
|
|
/// A HashDB which can manage a short-term journal potentially containing many forks of mutually
|
|
/// exclusive actions.
|
|
pub trait JournalDB : HashDB + Send + Sync {
|
|
/// Return a copy of ourself, in a box.
|
|
fn spawn(&self) -> Box<JournalDB>;
|
|
|
|
/// Returns heap memory size used
|
|
fn mem_used(&self) -> usize;
|
|
|
|
/// Check if this database has any commits
|
|
fn is_empty(&self) -> bool;
|
|
|
|
/// Commit all recent insert operations and canonical historical commits' removals from the
|
|
/// old era to the backing database, reverting any non-canonical historical commit's inserts.
|
|
fn commit(&mut self, now: u64, id: &H256, end: Option<(u64, H256)>) -> Result<u32, UtilError>;
|
|
|
|
/// State data query
|
|
fn state(&self, _id: &H256) -> Option<Bytes> {
|
|
None
|
|
}
|
|
}
|