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use std::sync::Arc;
use garage_rpc::layout::*;
use garage_rpc::system::System;
use garage_util::data::*;
use crate::replication::*;
/// Full replication schema: all nodes store everything
/// Writes are disseminated in an epidemic manner in the network
/// Advantage: do all reads locally, extremely fast
/// Inconvenient: only suitable to reasonably small tables
#[derive(Clone)]
pub struct TableFullReplication {
/// The membership manager of this node
pub system: Arc<System>,
/// Max number of faults allowed while replicating a record
pub max_faults: usize,
}
impl TableReplication for TableFullReplication {
fn read_nodes(&self, _hash: &Hash) -> Vec<Uuid> {
vec![self.system.id]
}
fn read_quorum(&self) -> usize {
1
}
fn write_nodes(&self, _hash: &Hash) -> Vec<Uuid> {
let layout = self.system.layout_watch.borrow();
layout.node_ids().to_vec()
}
fn write_quorum(&self) -> usize {
let nmembers = self.system.layout_watch.borrow().node_ids().len();
if nmembers > self.max_faults {
nmembers - self.max_faults
} else {
1
}
}
fn max_write_errors(&self) -> usize {
self.max_faults
}
fn partition_of(&self, _hash: &Hash) -> Partition {
0u16
}
fn partitions(&self) -> Vec<(Partition, Hash)> {
vec![(0u16, [0u8; 32].into())]
}
}
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