Решение на упр.05 задача 2 от Пламен Колев
Резултати
- 3 точки от тестове
- 0 бонус точки
- 3 точки общо
- 3 успешни тест(а)
- 0 неуспешни тест(а)
Код
use std::collections::HashMap;
use std::hash::Hash;
#[allow(dead_code)]
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,
{
let mut groups: HashMap<K, Vec<D>> = HashMap::new();
for event in events {
if let Some(data) = data_fn(event) {
let key = group_fn(event);
groups.entry(key).or_default().push(data);
}
}
let mut result: HashMap<K, O> = HashMap::new();
for (key, vector) in groups {
let value = aggregate(&vector);
result.insert(key, value);
}
result
}
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)> {
let result = group_and_aggregate(events,
|e| format!("{:?}", e.metric),
|e| Some(e.value),
|values| values.iter().sum::<f64>() / values.len() as f64,
);
result.into_iter().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)> {
let result = group_and_aggregate(events,
|e| e.sensor.clone(),
|e|if e.metric == self.metric {
Some(e.value)
}
else { None },
|values| values.iter().sum::<f64>() / values.len() as f64,
);
result.into_iter().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-sink v0.3.31
Compiling futures-core v0.3.31
Compiling futures-channel v0.3.31
Compiling pin-project-lite v0.2.16
Compiling futures-io v0.3.31
Compiling syn v2.0.110
Compiling memchr v2.7.6
Compiling futures-task v0.3.31
Compiling pin-utils v0.1.0
Compiling slab v0.4.11
Compiling solution v0.1.0 (/tmp/d20251113-1757769-1l34ror/solution)
warning: variants `Load`, `Frequency`, and `Temperature` are never constructed
--> src/lib.rs:14:5
|
13 | enum SensorMetric {
| ------------ variants in this enum
14 | Load,
| ^^^^
15 | Frequency,
| ^^^^^^^^^
16 | Temperature,
| ^^^^^^^^^^^
|
= note: `SensorMetric` has derived impls for the traits `Clone` and `Debug`, but these are intentionally ignored during dead code analysis
= note: `#[warn(dead_code)]` on by default
warning: function `group_and_aggregate` is never used
--> src/lib.rs:19:4
|
19 | fn group_and_aggregate<O, E, D, K>(
| ^^^^^^^^^^^^^^^^^^^
warning: trait `Aggregator` is never used
--> src/lib.rs:44:7
|
44 | trait Aggregator {
| ^^^^^^^^^^
warning: struct `TotalAggregator` is never constructed
--> src/lib.rs:51:8
|
51 | struct TotalAggregator {}
| ^^^^^^^^^^^^^^^
warning: struct `MetricAggregator` is never constructed
--> src/lib.rs:69:8
|
69 | struct MetricAggregator {
| ^^^^^^^^^^^^^^^^
warning: `solution` (lib) generated 5 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: method `name` is never used
--> tests/../src/lib.rs:47:8
|
44 | trait Aggregator {
| ---------- method in this trait
...
47 | fn name(&self) -> String;
| ^^^^
|
= note: `#[warn(dead_code)]` on by default
warning: `solution` (test "solution_test") generated 1 warning
Finished `test` profile [unoptimized + debuginfo] target(s) in 8.89s
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