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use std::sync::Arc;
use std::sync::atomic::{AtomicU64, Ordering};
#[derive(Clone, Copy, Eq, PartialEq, Hash, Debug)]
pub struct ObjectId
{
pub file_id: u16,
pub extent_id: u16,
pub block_id: u16,
pub entry_id: u16,
}
impl ObjectId {
pub fn new() -> Self {
ObjectId {
file_id: 0,
extent_id: 0,
block_id: 0,
entry_id: 0,
}
}
pub fn init(file_id: u16,
extent_id: u16,
block_id: u16,
entry_id: u16) -> Self
{
ObjectId {
file_id,
extent_id,
block_id,
entry_id,
}
}
pub fn obj_bkt(&self, nbkt: usize) -> usize {
(self.block_id as usize +
self.extent_id as usize +
self.entry_id as usize +
self.file_id as usize) % nbkt
}
}
#[derive(Clone, Copy, Eq, Hash, PartialEq, Debug)]
pub struct BlockId
{
pub file_id: u16,
pub extent_id: u16,
pub block_id: u16,
}
impl BlockId {
pub fn new() -> Self {
BlockId {
file_id: 0,
extent_id: 0,
block_id: 0,
}
}
pub fn init(file_id: u16, extent_id: u16, block_id: u16) -> Self {
BlockId {
file_id,
extent_id,
block_id,
}
}
pub fn from_obj(obj: &ObjectId) -> Self {
BlockId {
file_id: obj.file_id,
extent_id: obj.extent_id,
block_id: obj.block_id,
}
}
pub fn hash(&self, n: usize) -> usize {
(self.block_id as usize +
self.extent_id as usize +
self.file_id as usize) % n
}
}
#[derive(Clone)]
pub struct Sequence {
sn: Arc<AtomicU64>,
}
impl Sequence {
pub fn new(sn: u64) -> Self {
Sequence {
sn: Arc::new(AtomicU64::new(sn)),
}
}
pub fn set(&self, sn: u64) {
self.sn.store(sn, Ordering::Relaxed)
}
pub fn get_next(&self) -> u64 {
self.sn.fetch_add(1, Ordering::Relaxed)
}
pub fn get_cur(&self) -> u64 {
self.sn.load(Ordering::Relaxed)
}
}
#[derive(Clone)]
pub struct SharedSequences {
pub csn: Sequence,
pub latest_commit_csn: Arc<AtomicU64>,
pub checkpoint_csn: Sequence,
}