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// This file is part of Substrate.
// Copyright (C) Parity Technologies (UK) Ltd.
// SPDX-License-Identifier: GPL-3.0-or-later WITH Classpath-exception-2.0
// This program is free software: you can redistribute it and/or modify
// it under the terms of the GNU General Public License as published by
// the Free Software Foundation, either version 3 of the License, or
// (at your option) any later version.
// This program is distributed in the hope that it will be useful,
// but WITHOUT ANY WARRANTY; without even the implied warranty of
// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
// GNU General Public License for more details.
// You should have received a copy of the GNU General Public License
// along with this program. If not, see <https://www.gnu.org/licenses/>.
use std::collections::HashSet;
use crate::{
id_sequence::SeqID,
pubsub::{Dispatch, Subscribe, Unsubscribe},
};
/// The shared structure to keep track on subscribers.
#[derive(Debug, Default)]
pub(super) struct Registry {
pub(super) subscribers: HashSet<SeqID>,
}
impl Subscribe<()> for Registry {
fn subscribe(&mut self, _subs_key: (), subs_id: SeqID) {
self.subscribers.insert(subs_id);
}
}
impl Unsubscribe for Registry {
fn unsubscribe(&mut self, subs_id: SeqID) {
self.subscribers.remove(&subs_id);
}
}
impl<MakePayload, Payload, Error> Dispatch<MakePayload> for Registry
where
MakePayload: FnOnce() -> Result<Payload, Error>,
Payload: Clone,
{
type Item = Payload;
type Ret = Result<(), Error>;
fn dispatch<F>(&mut self, make_payload: MakePayload, mut dispatch: F) -> Self::Ret
where
F: FnMut(&SeqID, Self::Item),
{
if !self.subscribers.is_empty() {
let payload = make_payload()?;
for subs_id in &self.subscribers {
dispatch(subs_id, payload.clone());
}
}
Ok(())
}
}