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pub use super::{sync::Listener, sync::SyncDispatcherRequest};
use std::{collections::HashMap, hash::Hash, rc::Weak};
use super::RwLock;
pub mod dispatcher;
pub mod priority_dispatcher;
pub use dispatcher::Dispatcher;
pub use priority_dispatcher::PriorityDispatcher;
type EventFunction<T> = Vec<Box<dyn Fn(&T) -> Option<SyncDispatcherRequest>>>;
type ListenerMap<T> = HashMap<T, FnsAndTraits<T>>;
#[derive(Debug)]
pub(crate) enum ExecuteRequestsResult {
Finished,
Stopped,
}
pub(crate) fn execute_sync_dispatcher_requests<T, F>(
vec: &mut Vec<T>,
mut function: F,
) -> ExecuteRequestsResult
where
F: FnMut(&T) -> Option<SyncDispatcherRequest>,
{
let mut index = 0;
loop {
if index < vec.len() {
match function(&vec[index]) {
None => index += 1,
Some(SyncDispatcherRequest::StopListening) => {
vec.swap_remove(index);
}
Some(SyncDispatcherRequest::StopPropagation) => {
return ExecuteRequestsResult::Stopped
}
Some(SyncDispatcherRequest::StopListeningAndPropagation) => {
vec.swap_remove(index);
return ExecuteRequestsResult::Stopped;
}
}
} else {
return ExecuteRequestsResult::Finished;
}
}
}
struct FnsAndTraits<T>
where
T: PartialEq + Eq + Hash + Clone + 'static,
{
traits: Vec<Weak<RwLock<dyn Listener<T> + 'static>>>,
fns: EventFunction<T>,
}
impl<T> FnsAndTraits<T>
where
T: PartialEq + Eq + Hash + Clone + 'static,
{
fn new_with_traits(trait_objects: Vec<Weak<RwLock<dyn Listener<T> + 'static>>>) -> Self {
FnsAndTraits {
traits: trait_objects,
fns: vec![],
}
}
fn new_with_fns(fns: EventFunction<T>) -> Self {
FnsAndTraits {
traits: vec![],
fns,
}
}
}
#[cfg(test)]
mod tests {
use super::*;
#[cfg(test)]
mod execute_sync_dispatcher_requests {
use super::*;
fn map_usize_to_request(x: &usize) -> Option<SyncDispatcherRequest> {
match *x {
0 => Some(SyncDispatcherRequest::StopListening),
1 => Some(SyncDispatcherRequest::StopPropagation),
2 => Some(SyncDispatcherRequest::StopListeningAndPropagation),
_ => None,
}
}
#[test]
fn stop_listening() {
let mut vec = vec![0, 0, 0, 1, 1, 1, 1];
execute_sync_dispatcher_requests(&mut vec, map_usize_to_request);
assert_eq!(vec, [1, 0, 0, 1, 1, 1]);
}
#[test]
fn empty_vec() {
let mut vec = Vec::new();
execute_sync_dispatcher_requests(&mut vec, map_usize_to_request);
assert!(vec.is_empty());
}
#[test]
fn removing_all() {
let mut vec = vec![0, 0, 0, 0, 0, 0, 0];
execute_sync_dispatcher_requests(&mut vec, map_usize_to_request);
assert!(vec.is_empty());
}
#[test]
fn remove_one_element_and_stop() {
let mut vec = vec![2, 0];
execute_sync_dispatcher_requests(&mut vec, map_usize_to_request);
assert_eq!(vec, [0]);
}
}
}