Alex
9c931f5eda
advantages - reads don't prevent preparing writes - can be followed from other parts of the system by cloning the receiver
67 lines
1.4 KiB
Rust
67 lines
1.4 KiB
Rust
use async_trait::async_trait;
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use serde::{Deserialize, Serialize};
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use std::sync::Arc;
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use tokio::sync::RwLock;
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use crate::data::*;
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use crate::server::Garage;
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use crate::table::*;
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#[derive(PartialEq, Clone, Debug, Serialize, Deserialize)]
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pub struct BlockRef {
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// Primary key
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pub block: Hash,
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// Sort key
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pub version: UUID,
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// Keep track of deleted status
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pub deleted: bool,
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}
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impl Entry<Hash, UUID> for BlockRef {
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fn partition_key(&self) -> &Hash {
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&self.block
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}
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fn sort_key(&self) -> &UUID {
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&self.version
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}
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fn merge(&mut self, other: &Self) {
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if other.deleted {
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self.deleted = true;
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}
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}
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}
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pub struct BlockRefTable {
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pub garage: RwLock<Option<Arc<Garage>>>,
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}
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#[async_trait]
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impl TableFormat for BlockRefTable {
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type P = Hash;
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type S = UUID;
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type E = BlockRef;
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async fn updated(&self, old: Option<Self::E>, new: Self::E) {
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let garage = self.garage.read().await.as_ref().cloned().unwrap();
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let was_before = old.map(|x| !x.deleted).unwrap_or(false);
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let is_after = !new.deleted;
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if is_after && !was_before {
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if let Err(e) = garage.block_manager.block_incref(&new.block) {
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eprintln!("Failed to incref block {:?}: {}", &new.block, e);
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}
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}
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if was_before && !is_after {
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if let Err(e) = garage
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.block_manager
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.block_decref(&new.block, &garage.background)
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{
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eprintln!("Failed to decref block {:?}: {}", &new.block, e);
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}
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}
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}
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}
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