Решение на упр.05 задача 2 от Борил Василев
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;
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 map: HashMap<K, Vec<D>> = HashMap::new();
for event in events
{
let key = group_fn(event);
if let Some(data) = data_fn(event)
{
map.entry(key).or_default().push(data);
}
}
let mut result: HashMap<K, O> = HashMap::new();
for (key, value) in map
{
let _ = result.insert(key, aggregate(value.as_slice()));
}
return 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
{
return "total".to_string();
}
fn aggregate(&self, events: &[Event]) -> Vec<(String, f64)>
{
return group_and_aggregate(events,
|event: &Event| -> String { return format!("{:?}", event.metric); },
|event: &Event| -> Option<f64> { return Some(event.value); },
|events: &[f64]| -> f64 { return events.iter().sum::<f64>() / events.len() as f64; })
.into_iter().collect();
}
}
struct MetricAggregator
{
metric: SensorMetric
}
impl Aggregator for MetricAggregator
{
type Output = f64;
fn name(&self) -> String
{
return format!("{:?}", self.metric);
}
fn aggregate(&self, events: &[Event]) -> Vec<(String, f64)>
{
return group_and_aggregate(events,
|event: &Event| -> String { return event.sensor.clone(); },
|event: &Event| -> Option<f64> { return if event.metric == self.metric { Some(event.value) } else { None }; },
|events: &[f64]| -> f64 { return events.iter().sum::<f64>() / events.len() as f64; })
.into_iter().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-sink v0.3.31
Compiling futures-core v0.3.31
Compiling futures-channel v0.3.31
Compiling futures-task v0.3.31
Compiling syn v2.0.110
Compiling pin-utils v0.1.0
Compiling futures-io v0.3.31
Compiling slab v0.4.11
Compiling memchr v2.7.6
Compiling pin-project-lite v0.2.16
Compiling solution v0.1.0 (/tmp/d20251113-1757769-9gv5r4/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:13:6
|
13 | enum SensorMetric
| ^^^^^^^^^^^^
warning: function `group_and_aggregate` is never used
--> src/lib.rs:20:4
|
20 | fn group_and_aggregate<O, E, D, K>(events: &[E],
| ^^^^^^^^^^^^^^^^^^^
warning: trait `Aggregator` is never used
--> src/lib.rs:48:7
|
48 | 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:79:8
|
79 | 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:6:5
|
4 | struct Event
| ----- field in this struct
5 | {
6 | timestamp: u64,
| ^^^^^^^^^
|
= note: `#[warn(dead_code)]` on by default
warning: method `name` is never used
--> tests/../src/lib.rs:52:8
|
48 | trait Aggregator
| ---------- method in this trait
...
52 | fn name(&self) -> String;
| ^^^^
warning: `solution` (test "solution_test") generated 2 warnings
Finished `test` profile [unoptimized + debuginfo] target(s) in 9.01s
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