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use std::sync::Arc;
use ruma::{CanonicalJsonObject, EventId, OwnedUserId, RoomId, UserId};
use crate::{PduEvent, Result};
pub trait Data: Send + Sync {
fn first_pdu_in_room(&self, room_id: &RoomId) -> Result<Option<Arc<PduEvent>>>;
fn last_timeline_count(&self, sender_user: &UserId, room_id: &RoomId) -> Result<u64>;
/// Returns the `count` of this pdu's id.
fn get_pdu_count(&self, event_id: &EventId) -> Result<Option<u64>>;
/// Returns the json of a pdu.
fn get_pdu_json(&self, event_id: &EventId) -> Result<Option<CanonicalJsonObject>>;
/// Returns the json of a pdu.
fn get_non_outlier_pdu_json(&self, event_id: &EventId) -> Result<Option<CanonicalJsonObject>>;
/// Returns the pdu's id.
fn get_pdu_id(&self, event_id: &EventId) -> Result<Option<Vec<u8>>>;
/// Returns the pdu.
///
/// Checks the `eventid_outlierpdu` Tree if not found in the timeline.
fn get_non_outlier_pdu(&self, event_id: &EventId) -> Result<Option<PduEvent>>;
/// Returns the pdu.
///
/// Checks the `eventid_outlierpdu` Tree if not found in the timeline.
fn get_pdu(&self, event_id: &EventId) -> Result<Option<Arc<PduEvent>>>;
/// Returns the pdu.
///
/// This does __NOT__ check the outliers `Tree`.
fn get_pdu_from_id(&self, pdu_id: &[u8]) -> Result<Option<PduEvent>>;
/// Returns the pdu as a `BTreeMap<String, CanonicalJsonValue>`.
fn get_pdu_json_from_id(&self, pdu_id: &[u8]) -> Result<Option<CanonicalJsonObject>>;
/// Returns the `count` of this pdu's id.
fn pdu_count(&self, pdu_id: &[u8]) -> Result<u64>;
/// Adds a new pdu to the timeline
fn append_pdu(
&self,
pdu_id: &[u8],
pdu: &PduEvent,
json: &CanonicalJsonObject,
count: u64,
) -> Result<()>;
/// Removes a pdu and creates a new one with the same id.
fn replace_pdu(&self, pdu_id: &[u8], pdu: &PduEvent) -> Result<()>;
/// Returns an iterator over all events in a room that happened after the event with id `since`
/// in chronological order.
fn pdus_since<'a>(
&'a self,
user_id: &UserId,
room_id: &RoomId,
since: u64,
) -> Result<Box<dyn Iterator<Item = Result<(Vec<u8>, PduEvent)>> + 'a>>;
/// Returns an iterator over all events and their tokens in a room that happened before the
/// event with id `until` in reverse-chronological order.
fn pdus_until<'a>(
&'a self,
user_id: &UserId,
room_id: &RoomId,
until: u64,
) -> Result<Box<dyn Iterator<Item = Result<(Vec<u8>, PduEvent)>> + 'a>>;
fn pdus_after<'a>(
&'a self,
user_id: &UserId,
room_id: &RoomId,
from: u64,
) -> Result<Box<dyn Iterator<Item = Result<(Vec<u8>, PduEvent)>> + 'a>>;
fn increment_notification_counts(
&self,
room_id: &RoomId,
notifies: Vec<OwnedUserId>,
highlights: Vec<OwnedUserId>,
) -> Result<()>;
}
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