Refactor cache

src/ui/components/monitor_list.rs

@@ -1,7 +1,10 @@
-use std::borrow::Cow;
-use std::cmp::min;
-use std::collections::HashMap;
-use std::sync::OnceLock;
+use std::{
+    borrow::Cow,
+    cmp::min,
+    collections::{HashMap, hash_map::DefaultHasher},
+    hash::{Hash, Hasher},
+    sync::{OnceLock, RwLock},
+};
 
 use crate::i18n::t;
 use crate::ui::dashboard::{
@@ -19,6 +22,7 @@ use ratatui::{
 const STATUS_LINE_LENGTH: usize = 100;
 const MAX_NAME_LENGTH: usize = 30;
 static STATUS_SPANS: OnceLock<HashMap<MonitorStatus, Span<'static>>> = OnceLock::new();
+static STATUS_LINE_CACHE: OnceLock<RwLock<HashMap<u64, Vec<Span<'static>>>>> = OnceLock::new();
 
 pub fn render_monitor_list(main_frame: &mut Frame, area: Rect, state: &mut DashboardViewState) {
     let available_height = area.height as usize;
@@ -185,7 +189,7 @@ fn create_monitor_item(monitor: &MonitorViewState) -> Row<'_> {
     let response_text = format!("{:>7}ms", monitor.response_time);
     let uptime_text = format!("{:>7}%", monitor.uptime_24h);
 
-    let status_line_spans = create_status_line_spans(&monitor.status_history);
+    let status_line_spans = get_cached_status_line(&monitor.status_history);
 
     Row::new(vec![
         get_formated_line(format!("{} ", status_icon), status_color, Modifier::empty()),
@@ -225,18 +229,50 @@ fn get_cached_status_span(status: &MonitorStatus) -> Span<'static> {
     cache.get(status).cloned().unwrap_or_default()
 }
 
-fn create_status_line_spans(status_history: &[MonitorStatus]) -> Line<'_> {
-    let spans: Vec<_> = status_history
-        .iter()
-        .rev()
-        .take(STATUS_LINE_LENGTH)
-        .map(|status| get_cached_status_span(status))
-        .collect();
-    Line::from(spans)
-}
-
 fn title_style() -> Style {
     Style::default()
         .fg(Color::Yellow)
         .add_modifier(Modifier::BOLD)
 }
+
+fn calculate_history_hash(status_history: &[MonitorStatus]) -> u64 {
+    let mut hasher = DefaultHasher::new();
+    status_history
+        .iter()
+        .take(STATUS_LINE_LENGTH)
+        .for_each(|status| {
+            status.hash(&mut hasher);
+        });
+    hasher.finish()
+}
+
+fn get_cached_status_line(status_history: &[MonitorStatus]) -> Line<'static> {
+    let hash = calculate_history_hash(status_history);
+    let cache = STATUS_LINE_CACHE.get_or_init(|| RwLock::new(HashMap::new()));
+    {
+        let read = cache.read().unwrap();
+        if let Some(spans) = read.get(&hash) {
+            return Line::from(spans.clone());
+        }
+    }
+
+    let spans: Vec<Span<'static>> = status_history
+        .iter()
+        .rev()
+        .take(STATUS_LINE_LENGTH)
+        .map(|status| get_cached_status_span(status))
+        .collect();
+
+    let mut write = cache.write().unwrap();
+    if write.len() > 1000 {
+
+        let keys_to_remove: Vec<_> = write.keys().take(250).copied().collect();
+
+        for key in keys_to_remove {
+            write.remove(&key);
+        }
+
+    }
+    write.insert(hash, spans.clone());
+    Line::from(spans)
+}