87 lines
2.2 KiB
Rust
87 lines
2.2 KiB
Rust
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// Copyright 2015-2017 Parity Technologies (UK) Ltd.
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// This file is part of Parity.
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// Parity is free software: you can redistribute it and/or modify
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// it under the terms of the GNU General Public License as published by
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// the Free Software Foundation, either version 3 of the License, or
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// (at your option) any later version.
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// Parity is distributed in the hope that it will be useful,
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// but WITHOUT ANY WARRANTY; without even the implied warranty of
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// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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// GNU General Public License for more details.
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// You should have received a copy of the GNU General Public License
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// along with Parity. If not, see <http://www.gnu.org/licenses/>.
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//! A map of subscribers.
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use std::ops;
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use std::collections::HashMap;
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use jsonrpc_macros::pubsub::{Subscriber, Sink, SubscriptionId};
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#[derive(Clone, Debug)]
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pub struct Subscribers<T> {
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next_id: u64,
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subscriptions: HashMap<u64, T>,
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}
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impl<T> Default for Subscribers<T> {
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fn default() -> Self {
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Subscribers {
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next_id: 0,
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subscriptions: HashMap::new(),
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}
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}
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}
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impl<T> Subscribers<T> {
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fn next_id(&mut self) -> u64 {
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self.next_id += 1;
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self.next_id
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}
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/// Insert new subscription and return assigned id.
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pub fn insert(&mut self, val: T) -> SubscriptionId {
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let id = self.next_id();
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debug!(target: "pubsub", "Adding subscription id={}", id);
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self.subscriptions.insert(id, val);
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SubscriptionId::Number(id)
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}
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/// Removes subscription with given id and returns it (if any).
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pub fn remove(&mut self, id: &SubscriptionId) -> Option<T> {
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trace!(target: "pubsub", "Removing subscription id={:?}", id);
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match *id {
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SubscriptionId::Number(id) => {
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self.subscriptions.remove(&id)
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},
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_ => None,
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}
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}
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}
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impl <T> Subscribers<Sink<T>> {
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/// Assigns id and adds a subscriber to the list.
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pub fn push(&mut self, sub: Subscriber<T>) {
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let id = self.next_id();
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match sub.assign_id(SubscriptionId::Number(id)) {
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Ok(sink) => {
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debug!(target: "pubsub", "Adding subscription id={:?}", id);
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self.subscriptions.insert(id, sink);
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},
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Err(_) => {
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self.next_id -= 1;
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},
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}
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}
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}
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impl<T> ops::Deref for Subscribers<T> {
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type Target = HashMap<u64, T>;
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fn deref(&self) -> &Self::Target {
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&self.subscriptions
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}
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}
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