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// Copyright 2018 MaidSafe.net limited.
//
// This SAFE Network Software is licensed to you under The General Public License (GPL), version 3.
// Unless required by applicable law or agreed to in writing, the SAFE Network Software distributed
// under the GPL Licence is distributed on an "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
// KIND, either express or implied. Please review the Licences for the specific language governing
// permissions and limitations relating to use of the SAFE Network Software.
//! A system for dispatching `Event`s and possibly in the future other message types.
//!
//! The design allows the separate traits to handle dispatching of each type of message to an
//! object handling the appropriate types of message.
use event::Event;
use std::collections::VecDeque;
use std::default::Default;
use std::mem;
/// An event dispatcher. Collects things to deliver and "sends".
///
/// The API doesn't specify whether objects get sent immediately synchronously or asynchronously,
/// or collected and sent later.
pub trait EventBox {
/// Send an event
fn send_event(&mut self, event: Event);
}
/// Implementor of `EventBox`; stores its events in a `VecDeque`.
#[derive(Default)]
pub struct EventBuf {
events: VecDeque<Event>,
}
impl EventBox for EventBuf {
fn send_event(&mut self, event: Event) {
self.events.push_back(event)
}
}
impl EventBuf {
/// Create an empty box
pub fn new() -> Self {
Default::default()
}
/// Take the first Event, if any is stored.
pub fn take_first(&mut self) -> Option<Event> {
self.events.pop_front()
}
/// Extract the list of events (swapping in an empty list)
pub fn take_all(&mut self) -> VecDeque<Event> {
mem::replace(&mut self.events, Default::default())
}
}
impl Drop for EventBuf {
fn drop(&mut self) {
if !self.events.is_empty() {
error!("EventBox dropped events: {:?}", self.events);
}
}
}