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// Copyright (c) 2020-2022 David Sorokin <davsor@mail.ru>, based in Yoshkar-Ola, Russia
//
// This Source Code Form is subject to the terms of the Mozilla Public
// License, v. 2.0. If a copy of the MPL was not distributed with this
// file, You can obtain one at https://mozilla.org/MPL/2.0/.
use std::cell::RefCell;
use crate::simulation::Point;
use crate::simulation::observable::*;
use crate::simulation::composite::*;
use crate::simulation::event::Event;
use dvcompute_utils::grc::Grc;
/// Represents the history of the signal values.
pub struct ObservableHistory<T> where T: 'static {
/// The time values.
times: RefCell<Vec<f64>>,
/// The values themselves.
values: RefCell<Vec<T>>
}
/// Represents the history data of the signal values.
#[derive(Clone)]
pub struct ObservableHistoryData<T> where T: 'static {
/// The time values.
pub times: Vec<f64>,
/// The values themselves.
pub values: Vec<T>
}
impl<T> ObservableHistory<T> {
/// Read the history size at the specified modeling time.
pub fn len_at(&self, _p: &Point) -> usize {
let values = self.values.borrow();
values.len()
}
/// Read the history size.
pub fn len(hist: Grc<ObservableHistory<T>>) -> impl Event<Item = usize> + Clone {
cons_event(move |p: &Point| {
Result::Ok(hist.len_at(p))
})
}
/** Create a new signal history by the optional initial value, where the values can be emitted by the source provided. */
pub fn new<O>(comp: O, init: Option<T>, source: Option<Grc<ObservableSource<T>>>) -> CompositeBox<Grc<ObservableHistory<T>>>
where O: Observable<Message = T> + 'static,
T: Clone + 'static
{
let hist = Grc::new(ObservableHistory {
times: RefCell::new(vec![]),
values: RefCell::new(vec![])
});
let source_clone = source.clone();
return_composite(hist)
.and_then(move |hist| {
if let Some(init) = init {
cons_event(move |p: &Point| {
{
let mut times = hist.times.borrow_mut();
let mut values = hist.values.borrow_mut();
times.push(p.time);
values.push(init.clone());
}
if let Some(source) = source_clone {
source.trigger_at(&init, p)?;
}
Result::Ok(hist)
})
.into_composite()
.into_boxed()
} else {
return_composite(hist)
.into_boxed()
}
})
.and_then(move |hist| {
comp.subscribe({
let hist = hist.clone();
cons_observer(move |msg: &T, p: &Point| {
{
let mut times = hist.times.borrow_mut();
let mut values = hist.values.borrow_mut();
times.push(p.time);
values.push(msg.clone());
}
match &source {
None => {},
Some(source) => {
source.trigger_at(msg, p)?;
}
}
Result::Ok(())
})
})
.into_composite()
.and_then(move |h| {
disposable_composite(h)
})
.and_then(move |()| {
return_composite(hist)
})
})
.into_boxed()
}
/** Create a new signal history of the specified size by the accumulator and optional initial value. */
pub fn new_grid<O, F>(comp: O, size: usize, accum: F, init: Option<T>) -> CompositeBox<Grc<ObservableHistory<T>>>
where O: Observable<Message = T> + 'static,
T: Clone + 'static,
F: Fn(&T, &T) -> T + 'static
{
let hist = Grc::new(ObservableHistory {
times: RefCell::new(vec![]),
values: RefCell::new(vec![])
});
return_composite(hist)
.and_then(move |hist| {
if let Some(init) = init {
cons_event(move |p: &Point| {
{
let mut times = hist.times.borrow_mut();
let mut values = hist.values.borrow_mut();
times.push(p.time);
values.push(init.clone());
}
Result::Ok(hist)
})
.into_composite()
.into_boxed()
} else {
return_composite(hist)
.into_boxed()
}
})
.and_then(move |hist| {
comp.subscribe({
let hist = hist.clone();
cons_observer(move |msg: &T, p: &Point| {
let mut times = hist.times.borrow_mut();
let mut values = hist.values.borrow_mut();
if times.is_empty() {
times.push(p.time);
values.push(msg.clone());
} else {
let specs = &p.run.specs;
let n = times.len();
let t0 = &mut times[n - 1];
let v0 = &mut values[n - 1];
let index0 = specs.grid_index(*t0, size);
let index2 = specs.grid_index(p.time, size);
if (index0 != index2) || (*t0 <= specs.grid_time(index0 - 1, size)) {
times.push(p.time);
values.push(msg.clone());
} else {
*t0 = p.time;
*v0 = accum(v0, msg);
}
}
Result::Ok(())
})
})
.into_composite()
.and_then(move |h| {
disposable_composite(h)
})
.and_then(move |()| {
return_composite(hist)
})
})
.into_boxed()
}
/** Create a new signal history of the limit size, which is synchronized with IO. */
pub fn io_with_limit_size<O>(comp: O, limit_size: usize, init: Option<T>) -> CompositeBox<ObservableBox<ObservableHistoryData<T>>>
where O: Observable<Message = T> + 'static,
T: Clone + 'static
{
let signal_src = Grc::new(ObservableSource::new());
let txs_src = Grc::new(ObservableSource::new());
let txs_src_clone = txs_src.clone();
ObservableHistory::new(comp, init, Some(signal_src.clone()))
.and_then(move |hist: Grc<ObservableHistory<T>>| {
let txs_src_clone = txs_src.clone();
let hist_clone = hist.clone();
signal_src
.publish()
.subscribe(cons_observer(move |_msg: &T, p: &Point| {
let len = hist.len_at(p);
if len > limit_size {
let comp = {
let txs_src = txs_src.clone();
let hist = hist.clone();
enqueue_io_event(p.time, cons_event(move |p: &Point| {
let len = hist.len_at(p);
if len > limit_size {
let comp =
ObservableHistory::take(hist)
.and_then(move |txs: ObservableHistoryData<T>| {
txs_src.trigger(txs)
});
comp.call_event(p)?;
}
Result::Ok(())
})
.into_boxed())
};
comp.call_event(p)?;
}
Result::Ok(())
}))
.into_composite()
.and_then(|h: DisposableBox| {
disposable_composite(h)
})
.and_then(move |()| {
let flag = Grc::new(RefComp::new(true));
let flag_clone = flag.clone();
cons_event(move |p: &Point| {
enqueue_io_event(p.run.specs.stop_time,
cons_event(move |p: &Point| {
if flag.read_at(p) && (hist_clone.len_at(p) > 0) {
let comp =
ObservableHistory::take(hist_clone)
.and_then(move |txs: ObservableHistoryData<T>| {
txs_src_clone.trigger(txs)
});
comp.call_event(p)?;
}
Result::Ok(())
}).into_boxed())
.call_event(p)
})
.into_composite()
.and_then(move |()| {
disposable_composite(cons_disposable(move |p: &Point| {
flag_clone.write_at(false, p);
Result::Ok(())
}))
})
})
})
.map(move |()| {
txs_src_clone.publish()
.into_boxed()
})
.into_boxed()
}
/** Add the value to the history at the current modeling time. */
pub fn push(hist: Grc<Self>, item: T) -> impl Event<Item = ()> {
cons_event(move |p: &Point| {
let mut times = hist.times.borrow_mut();
let mut values = hist.values.borrow_mut();
times.push(p.time);
values.push(item);
Result::Ok(())
})
}
/** Read the history of the signal values. */
pub fn read(hist: Grc<Self>) -> impl Event<Item = ObservableHistoryData<T>>
where T: Clone + 'static
{
cons_event(move |_p: &Point| {
let times = hist.times.borrow();
let values = hist.values.borrow();
Result::Ok(ObservableHistoryData {
times: times.to_vec(),
values: values.to_vec()
})
})
}
/** Take the history of the signal values, after which the history becomes empty. */
pub fn take(hist: Grc<Self>) -> impl Event<Item = ObservableHistoryData<T>> {
cons_event(move |_p: &Point| {
let times = hist.times.replace(vec![]);
let values = hist.values.replace(vec![]);
Result::Ok(ObservableHistoryData {
times: times,
values: values
})
})
}
/** Reset the history of the signal values. */
pub fn reset(hist: Grc<Self>) -> impl Event<Item = ()> {
cons_event(move |_p: &Point| {
let mut times = hist.times.borrow_mut();
let mut values = hist.values.borrow_mut();
times.clear();
values.clear();
Result::Ok(())
})
}
}