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#[derive(Clone, Copy)]
pub enum ReplicationMode {
None,
TwoWay,
TwoWayDangerous,
ThreeWay,
ThreeWayDegraded,
ThreeWayDangerous,
}
impl ReplicationMode {
pub fn parse(v: &str) -> Option<Self> {
match v {
"none" | "1" => Some(Self::None),
"2" => Some(Self::TwoWay),
"2-dangerous" => Some(Self::TwoWayDangerous),
"3" => Some(Self::ThreeWay),
"3-degraded" => Some(Self::ThreeWayDegraded),
"3-dangerous" => Some(Self::ThreeWayDangerous),
_ => None,
}
}
pub fn control_write_max_faults(&self) -> usize {
match self {
Self::None => 0,
_ => 1,
}
}
pub fn replication_factor(&self) -> usize {
match self {
Self::None => 1,
Self::TwoWay | Self::TwoWayDangerous => 2,
Self::ThreeWay | Self::ThreeWayDegraded | Self::ThreeWayDangerous => 3,
}
}
pub fn read_quorum(&self) -> usize {
match self {
Self::None => 1,
Self::TwoWay | Self::TwoWayDangerous => 1,
Self::ThreeWay => 2,
Self::ThreeWayDegraded | Self::ThreeWayDangerous => 1,
}
}
pub fn write_quorum(&self) -> usize {
match self {
Self::None => 1,
Self::TwoWay => 2,
Self::TwoWayDangerous => 1,
Self::ThreeWay | Self::ThreeWayDegraded => 2,
Self::ThreeWayDangerous => 1,
}
}
pub fn is_read_after_write_consistent(&self) -> bool {
match self {
Self::None | Self::TwoWay | Self::ThreeWay => true,
_ => false,
}
}
}
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