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use std::collections::HashSet;
use std::fmt;
use std::ops::{Deref, DerefMut};
use async_trait::async_trait;
use safecast::AsType;
use tc_error::*;
use tcgeneric::{Id, PathSegment};
use super::{Transaction, TxnId};
pub type BlockId = PathSegment;
pub trait BlockData: Clone + Send + Sync + 'static {
fn ext() -> &'static str;
}
#[cfg(feature = "tensor")]
impl BlockData for afarray::Array {
fn ext() -> &'static str {
"array"
}
}
impl BlockData for tc_value::Value {
fn ext() -> &'static str {
"value"
}
}
#[async_trait]
pub trait Store: Clone + Send + Sync {
async fn is_empty(&self, txn_id: TxnId) -> TCResult<bool>;
}
#[async_trait]
pub trait File<B: Clone>: Store + Sized + 'static {
type Read: Deref<Target = B> + Send;
type Write: DerefMut<Target = B> + Send;
async fn block_ids(&self, txn_id: TxnId) -> TCResult<HashSet<BlockId>>;
async fn contains_block(&self, txn_id: TxnId, name: &BlockId) -> TCResult<bool>;
async fn copy_from(&self, other: &Self, txn_id: TxnId) -> TCResult<()>;
async fn create_block(
&self,
txn_id: TxnId,
name: BlockId,
initial_value: B,
size_hint: usize,
) -> TCResult<Self::Write>;
async fn create_block_unique(
&self,
txn_id: TxnId,
initial_value: B,
size_hint: usize,
) -> TCResult<(BlockId, Self::Write)>;
async fn delete_block(&self, txn_id: TxnId, name: BlockId) -> TCResult<()>;
async fn read_block(&self, txn_id: TxnId, name: BlockId) -> TCResult<Self::Read>;
async fn read_block_owned(self, txn_id: TxnId, name: BlockId) -> TCResult<Self::Read>;
async fn write_block(&self, txn_id: TxnId, name: BlockId) -> TCResult<Self::Write>;
async fn truncate(&self, txn_id: TxnId) -> TCResult<()>;
}
#[async_trait]
pub trait Dir: Store + Send + Sized + 'static {
type File: Send;
type FileClass: Send;
async fn contains(&self, txn_id: TxnId, name: &PathSegment) -> TCResult<bool>;
async fn create_dir(&self, txn_id: TxnId, name: PathSegment) -> TCResult<Self>;
async fn create_dir_unique(&self, txn_id: TxnId) -> TCResult<Self>;
async fn create_file<C, F, B>(&self, txn_id: TxnId, name: Id, class: C) -> TCResult<F>
where
C: Copy + Send + fmt::Display,
F: Clone,
B: BlockData,
Self::FileClass: From<C>,
Self::File: AsType<F>,
F: File<B>;
async fn create_file_unique<C, F, B>(&self, txn_id: TxnId, class: C) -> TCResult<F>
where
C: Copy + Send + fmt::Display,
F: Clone,
B: BlockData,
Self::FileClass: From<C>,
Self::File: AsType<F>,
F: File<B>;
async fn get_dir(&self, txn_id: TxnId, name: &PathSegment) -> TCResult<Option<Self>>;
async fn get_file<F, B>(&self, txn_id: TxnId, name: &Id) -> TCResult<Option<F>>
where
F: Clone,
B: BlockData,
Self::File: AsType<F>,
F: File<B>;
}
#[async_trait]
pub trait Persist<D: Dir>: Sized {
type Schema;
type Store: Store;
type Txn: Transaction<D>;
fn schema(&self) -> &Self::Schema;
async fn load(txn: &Self::Txn, schema: Self::Schema, store: Self::Store) -> TCResult<Self>;
}
#[async_trait]
pub trait CopyFrom<D: Dir, I>: Persist<D> {
async fn copy_from(
instance: I,
store: <Self as Persist<D>>::Store,
txn: &<Self as Persist<D>>::Txn,
) -> TCResult<Self>;
}
#[async_trait]
pub trait Restore<D: Dir>: Persist<D> {
async fn restore(&self, backup: &Self, txn_id: TxnId) -> TCResult<()>;
}