Решение на упр.05 задача 2 от Владимир Великов
Към профила на Владимир Великов
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;
#[derive(Debug)]
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 intermediate_data: HashMap<K, Vec<D>> = HashMap::new();
for event in events {
if let Some(data) = data_fn(event) {
let key = group_fn(event);
intermediate_data.entry(key).or_default().push(data);
}
}
intermediate_data
.into_iter()
.map(|(key, data_list)| (key, aggregate(&data_list)))
.collect()
}
fn calculate_average(values: &[f64]) -> f64 {
if values.is_empty() {
return 0.0;
}
let sum: f64 = values.iter().sum();
sum / (values.len() as f64)
}
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 results_map = group_and_aggregate(
events,
|event| event.metric,
|event| Some(event.value),
calculate_average,
);
let mut results: Vec<(String, f64)> = results_map
.into_iter()
.map(|(metric, avg_value)| (format!("{:?}", metric), avg_value))
.collect();
results.sort_by(|a, b| a.0.cmp(&b.0));
results
}
}
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 results_map = group_and_aggregate(
events,
|event| event.sensor.clone(),
|event| {
if event.metric == self.metric {
Some(event.value)
} else {
None
}
},
calculate_average,
);
let mut results: Vec<(String, f64)> = results_map.into_iter().collect();
results.sort_by(|a, b| a.0.cmp(&b.0));
results
}
}
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 pin-utils v0.1.0
Compiling futures-io v0.3.31
Compiling syn v2.0.110
Compiling pin-project-lite v0.2.16
Compiling slab v0.4.11
Compiling futures-task v0.3.31
Compiling memchr v2.7.6
Compiling solution v0.1.0 (/tmp/d20251113-1757769-rlbe1i/solution)
warning: struct `Event` is never constructed
--> src/lib.rs:5:8
|
5 | struct Event {
| ^^^^^
|
= note: `#[warn(dead_code)]` on by default
warning: enum `SensorMetric` is never used
--> src/lib.rs:13:6
|
13 | enum SensorMetric {
| ^^^^^^^^^^^^
warning: function `group_and_aggregate` is never used
--> src/lib.rs:19:4
|
19 | fn group_and_aggregate<O, E, D, K>(
| ^^^^^^^^^^^^^^^^^^^
warning: function `calculate_average` is never used
--> src/lib.rs:43:4
|
43 | fn calculate_average(values: &[f64]) -> f64 {
| ^^^^^^^^^^^^^^^^^
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:85:8
|
85 | struct MetricAggregator {
| ^^^^^^^^^^^^^^^^
warning: `solution` (lib) generated 7 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:6:5
|
5 | struct Event {
| ----- field in this struct
6 | timestamp: u64,
| ^^^^^^^^^
|
= note: `Event` has a derived impl for the trait `Debug`, but this is intentionally ignored during dead code analysis
= note: `#[warn(dead_code)]` on by default
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 2 warnings
Finished `test` profile [unoptimized + debuginfo] target(s) in 9.03s
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