pub struct RoleState {
pub roster: Vec<RosterEntry>,
pub lease: Option<Lease>,
}Expand description
The state that a reader builds from the records of one role.
roster is in offset order, which is registration order.
Fields§
§roster: Vec<RosterEntry>The candidates of the role, in registration order.
lease: Option<Lease>The lease of the role, and None when no member holds it.
Implementations§
Source§impl RoleState
impl RoleState
Sourcepub fn from_records<I>(role: Role, records: I) -> Self
pub fn from_records<I>(role: Role, records: I) -> Self
Folds the records of one role into a role state.
The caller reads the coordination partition in offset order and passes each record with its offset. The fold also gives the right answer for a different order, because it keeps the record of the highest offset for every key.
Sourcepub fn holder(&self) -> Option<&MemberId>
pub fn holder(&self) -> Option<&MemberId>
The member the lease names, and None when the role has no lease.
The holder of an expired lease is still the holder. Ask
crate::lease::LeaseTiming::is_live_at whether the lease is live.
Sourcepub fn entry(&self, member: &MemberId) -> Option<&RosterEntry>
pub fn entry(&self, member: &MemberId) -> Option<&RosterEntry>
The roster entry of member, and None when it did not register.
Sourcepub fn rank_of(&self, member: &MemberId) -> Option<usize>
pub fn rank_of(&self, member: &MemberId) -> Option<usize>
The challenge rank of member, and None when it did not register.
The rank is the index of member in the roster after the removal of the
current holder, so the first standby takes rank 0. The holder itself
keeps rank 0. A holder only reaches the rank test when its own lease has
expired, and it still owns the newest epoch at that point, so it
reclaims the role for less churn than a failover costs.
Trait Implementations§
impl Eq for RoleState
impl StructuralPartialEq for RoleState
Auto Trait Implementations§
impl Freeze for RoleState
impl RefUnwindSafe for RoleState
impl Send for RoleState
impl Sync for RoleState
impl Unpin for RoleState
impl UnsafeUnpin for RoleState
impl UnwindSafe for RoleState
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