Решение на упр.05 задача 2 от Димитър Колев
Резултати
- 3 точки от тестове
- 0 бонус точки
- 3 точки общо
- 3 успешни тест(а)
- 0 неуспешни тест(а)
Код
use std::collections::{hash_map::Entry, HashMap};
use std::hash::Hash;
struct Event {
timestamp: u64,
sensor: String,
metric: SensorMetric,
value: f64,
}
#[derive(Debug, Clone, Copy, PartialEq, Eq, Hash)]
enum SensorMetric {
Load,
Frequency,
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 + Clone,
{
events
.iter()
.fold(HashMap::new(), |mut acc: HashMap<K, Vec<D>>, e| {
if let Some(d) = data_fn(e) {
// https://users.rust-lang.org/t/hashmap-and-modify-or-insert-not-treated-as-exclusively-alternate-code-paths/94117
match acc.entry(group_fn(e)) {
Entry::Occupied(mut ds) => ds.get_mut().push(d),
Entry::Vacant(ds) => {
ds.insert(vec![d]);
()
}
}
}
acc
})
.iter()
.map(|(k, v)| (k.clone(), aggregate(v)))
.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)> {
group_and_aggregate(
events,
|e| match e.metric {
SensorMetric::Load => "Load".to_string(),
SensorMetric::Frequency => "Frequency".to_string(),
SensorMetric::Temperature => "Temperature".to_string(),
},
|e| Some(e.value),
|ds| ds.iter().sum::<f64>() / ds.len() as f64,
)
.iter()
.map(|(k, v)| (k.to_owned(), v.to_owned()))
.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)> {
group_and_aggregate(
events,
|e| e.sensor.clone(),
|e| {
if e.metric == self.metric {
Some(e.value)
} else {
None
}
},
|ds| ds.iter().sum::<f64>() / ds.len() as f64,
)
.iter()
.map(|(k, v)| (k.to_owned(), v.to_owned()))
.collect()
}
}
Лог от изпълнението
Updating crates.io index
Locking 17 packages to latest compatible versions
Compiling proc-macro2 v1.0.103
Compiling quote v1.0.42
Compiling unicode-ident v1.0.22
Compiling futures-core v0.3.31
Compiling futures-sink v0.3.31
Compiling futures-channel v0.3.31
Compiling pin-project-lite v0.2.16
Compiling slab v0.4.11
Compiling syn v2.0.110
Compiling pin-utils v0.1.0
Compiling futures-task v0.3.31
Compiling memchr v2.7.6
Compiling futures-io v0.3.31
Compiling solution v0.1.0 (/tmp/d20251113-1757769-18aa8r3/solution)
warning: struct `Event` is never constructed
--> src/lib.rs:4:8
|
4 | struct Event {
| ^^^^^
|
= note: `#[warn(dead_code)]` on by default
warning: enum `SensorMetric` is never used
--> src/lib.rs:12:6
|
12 | enum SensorMetric {
| ^^^^^^^^^^^^
warning: function `group_and_aggregate` is never used
--> src/lib.rs:18:4
|
18 | fn group_and_aggregate<O, E, D, K>(
| ^^^^^^^^^^^^^^^^^^^
warning: trait `Aggregator` is never used
--> src/lib.rs:48:7
|
48 | trait Aggregator {
| ^^^^^^^^^^
warning: struct `TotalAggregator` is never constructed
--> src/lib.rs:55:8
|
55 | struct TotalAggregator {}
| ^^^^^^^^^^^^^^^
warning: struct `MetricAggregator` is never constructed
--> src/lib.rs:80:8
|
80 | 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:5:5
|
4 | struct Event {
| ----- field in this struct
5 | timestamp: u64,
| ^^^^^^^^^
|
= note: `#[warn(dead_code)]` on by default
warning: method `name` is never used
--> tests/../src/lib.rs:51:8
|
48 | trait Aggregator {
| ---------- method in this trait
...
51 | fn name(&self) -> String;
| ^^^^
warning: `solution` (test "solution_test") generated 2 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 ... ok
test solution_test::test_by_metric_2 ... 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