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use std::fmt;
use crate::clock::DateTime;
#[derive(Clone, Copy, Debug, Eq, PartialEq, serde::Serialize)]
pub struct Instant {
pub at: DateTime,
#[serde(skip)]
pub sequence: Sequence,
}
impl Instant {
pub fn new(at: DateTime, sequence: Sequence) -> Self {
Self { at, sequence }
}
pub fn optional(at: Option<DateTime>, sequence: Option<Sequence>) -> Option<Self> {
at.zip(sequence)
.map(|(at, sequence)| Self::new(at, sequence))
}
}
impl From<Instant> for Sequence {
fn from(instant: Instant) -> Self {
instant.sequence
}
}
#[derive(
Clone,
Copy,
Debug,
Eq,
Ord,
PartialEq,
PartialOrd,
serde::Deserialize,
serde::Serialize,
sqlx::Type,
)]
#[serde(transparent)]
#[sqlx(transparent)]
pub struct Sequence(i64);
impl fmt::Display for Sequence {
fn fmt(&self, f: &mut fmt::Formatter<'_>) -> fmt::Result {
let Self(value) = self;
value.fmt(f)
}
}
impl Sequence {
pub fn up_to<P, E>(resume_point: P) -> impl for<'e> Fn(&'e E) -> bool + Clone
where
P: Into<Self>,
E: Sequenced,
{
let resume_point = resume_point.into();
move |event| event.sequence() <= resume_point
}
pub fn after<P, E>(resume_point: P) -> impl for<'e> Fn(&'e E) -> bool + Clone
where
P: Into<Self>,
E: Sequenced,
{
let resume_point = resume_point.into();
move |event| resume_point < event.sequence()
}
pub fn start_from<P, E>(resume_point: P) -> impl for<'e> Fn(&'e E) -> bool + Clone
where
P: Into<Self>,
E: Sequenced,
{
let resume_point = resume_point.into();
move |event| resume_point <= event.sequence()
}
pub fn merge<E>(a: &E, b: &E) -> bool
where
E: Sequenced,
{
a.sequence() < b.sequence()
}
}
pub trait Sequenced {
fn instant(&self) -> Instant;
fn at(&self) -> DateTime {
self.instant().at
}
fn sequence(&self) -> Sequence {
self.instant().into()
}
}
impl<E> Sequenced for &E
where
E: Sequenced,
{
fn instant(&self) -> Instant {
(*self).instant()
}
fn sequence(&self) -> Sequence {
(*self).sequence()
}
}
|
