Решение на упр.05 задача 2 от Димитър Николов
Към профила на Димитър Николов
Резултати
- 3 точки от тестове
- 0 бонус точки
- 3 точки общо
- 3 успешни тест(а)
- 0 неуспешни тест(а)
Код
use std::{collections::HashMap, hash::Hash};
struct Event {
timestamp: u64,
sensor: String,
metric: SensorMetric,
value: f64,
}
#[derive(Debug, Clone, Copy, PartialEq, Eq, Hash)]
enum SensorMetric {
Load,
Frequency,
Temperature,
}
impl From<SensorMetric> for String {
fn from(value: SensorMetric) -> Self {
match value {
SensorMetric::Load => String::from("Load"),
SensorMetric::Frequency => String::from("Frequency"),
SensorMetric::Temperature => String::from("Temperature"),
}
}
}
fn group_and_aggregate<O, E, D, K>(
events: &[E],
group_fn: impl Fn(&E) -> K,
data_fn: impl Fn(&E) -> Option<D>,
aggregate: impl Fn(&[D]) -> O,
) -> HashMap<K, O>
where
K: Eq + Hash,
{
events
.iter()
.fold(HashMap::<K, Vec<D>>::new(), |mut group, ev| {
let key = group_fn(ev);
let Some(data) = data_fn(ev) else {
return group;
};
group.entry(key).or_insert(Vec::new()).push(data);
group
})
.into_iter()
.map(|(key, value)| (key, aggregate(&value)))
.collect()
}
trait Aggregator {
type Output;
fn name(&self) -> String;
fn aggregate(&self, events: &[Event]) -> Vec<(String, Self::Output)>;
}
struct TotalAggregator {}
impl Aggregator for TotalAggregator {
type Output = f64;
fn name(&self) -> String {
"total".to_string()
}
fn aggregate(&self, events: &[Event]) -> Vec<(String, f64)> {
events
.iter()
.fold(HashMap::new(), |mut group, ev| {
group.entry(ev.metric).or_insert(Vec::new()).push(ev.value);
group
})
.into_iter()
.map(|(key, value)| {
let avg = value.iter().sum::<f64>() / value.len() as f64;
(key.into(), avg)
})
.collect()
}
}
struct MetricAggregator {
metric: SensorMetric,
}
impl Aggregator for MetricAggregator {
type Output = f64;
fn name(&self) -> String {
format!("{:?}", self.metric)
}
fn aggregate(&self, events: &[Event]) -> Vec<(String, f64)> {
events
.iter()
.fold(HashMap::new(), |mut group, ev| {
if ev.metric != self.metric {
return group;
}
group.entry(&ev.sensor).or_insert(Vec::new()).push(ev.value);
group
})
.into_iter()
.map(|(key, value)| {
let avg = value.iter().sum::<f64>() / value.len() as f64;
(key.to_owned(), avg)
})
.collect()
}
}
Лог от изпълнението
Updating crates.io index
Locking 17 packages to latest compatible versions
Compiling proc-macro2 v1.0.103
Compiling unicode-ident v1.0.22
Compiling quote v1.0.42
Compiling futures-core v0.3.31
Compiling futures-sink v0.3.31
Compiling futures-channel v0.3.31
Compiling futures-io v0.3.31
Compiling futures-task v0.3.31
Compiling syn v2.0.110
Compiling pin-project-lite v0.2.16
Compiling slab v0.4.11
Compiling pin-utils v0.1.0
Compiling memchr v2.7.6
Compiling solution v0.1.0 (/tmp/d20251113-1757769-1j01j56/solution)
warning: struct `Event` is never constructed
--> src/lib.rs:3:8
|
3 | struct Event {
| ^^^^^
|
= note: `#[warn(dead_code)]` on by default
warning: variants `Load`, `Frequency`, and `Temperature` are never constructed
--> src/lib.rs:12:5
|
11 | enum SensorMetric {
| ------------ variants in this enum
12 | Load,
| ^^^^
13 | Frequency,
| ^^^^^^^^^
14 | Temperature,
| ^^^^^^^^^^^
|
= note: `SensorMetric` has derived impls for the traits `Clone` and `Debug`, but these are intentionally ignored during dead code analysis
warning: function `group_and_aggregate` is never used
--> src/lib.rs:27:4
|
27 | fn group_and_aggregate<O, E, D, K>(
| ^^^^^^^^^^^^^^^^^^^
warning: trait `Aggregator` is never used
--> src/lib.rs:51:7
|
51 | trait Aggregator {
| ^^^^^^^^^^
warning: struct `TotalAggregator` is never constructed
--> src/lib.rs:58:8
|
58 | struct TotalAggregator {}
| ^^^^^^^^^^^^^^^
warning: struct `MetricAggregator` is never constructed
--> src/lib.rs:82:8
|
82 | struct MetricAggregator {
| ^^^^^^^^^^^^^^^^
warning: `solution` (lib) generated 6 warnings
Compiling futures-macro v0.3.31
Compiling futures-util v0.3.31
Compiling futures-executor v0.3.31
Compiling futures v0.3.31
warning: field `timestamp` is never read
--> tests/../src/lib.rs:4:5
|
3 | struct Event {
| ----- field in this struct
4 | timestamp: u64,
| ^^^^^^^^^
|
= note: `#[warn(dead_code)]` on by default
warning: function `group_and_aggregate` is never used
--> tests/../src/lib.rs:27:4
|
27 | fn group_and_aggregate<O, E, D, K>(
| ^^^^^^^^^^^^^^^^^^^
warning: method `name` is never used
--> tests/../src/lib.rs:54:8
|
51 | trait Aggregator {
| ---------- method in this trait
...
54 | fn name(&self) -> String;
| ^^^^
warning: `solution` (test "solution_test") generated 3 warnings
Finished `test` profile [unoptimized + debuginfo] target(s) in 8.97s
Running tests/solution_test.rs (target/debug/deps/solution_test-f75e629a1d90e17c)
running 3 tests
test solution_test::test_by_metric_2 ... ok
test solution_test::test_by_metric ... ok
test solution_test::test_total ... ok
test result: ok. 3 passed; 0 failed; 0 ignored; 0 measured; 0 filtered out; finished in 0.00s