Struct MembershipUpdate 

pub struct MembershipUpdate<'a> {
    pub room_id: &'a RoomId,
    pub user_id: &'a UserId,
    pub membership_event: RoomMemberEventContent,
    pub sender: &'a UserId,
    pub last_state: StrippedRoomState,
    pub invite_via: Option<Vec<OwnedServerName>>,
    pub update_joined_count: bool,
    pub count: PduCount,
}

Parameters for one membership cache transition.

Borrowed identifiers remain valid only for the duration of the update. Owned event data is consumed by the selected transition.

Fields

room_id: &'a RoomId

Room whose membership changed.

Membership indexes and aggregate counts are updated for this room.

user_id: &'a UserId

User whose membership changed.

Both local and remote users are represented in the membership indexes.

membership_event: RoomMemberEventContent

Membership event content driving the transition.

The membership state selects which indexes are written and cleared.

sender: &'a UserId

User who sent the membership event.

The transition records it for trace attribution rather than reading it.

last_state: StrippedRoomState

Stripped room state associated with an invite or knock.

Other membership transitions leave this value unused. An absent or empty value preserves an invite’s stored state rather than clearing it.

invite_via: Option<Vec<OwnedServerName>>

Servers supplied as routing hints for an invite.

Invite handling stores only non-empty lists. The routing hints commit with the membership indexes.

update_joined_count: bool

Whether to rebuild the room’s aggregate membership counts.

Bulk state updates can defer this rebuild until all transitions are applied.

count: PduCount

Stream position associated with the membership event.

Count-indexed membership rows store its unsigned representation.