Cache/buffer lifecycle

src/common/buffer/BufferLineStringCache.ts

@@ -4,15 +4,18 @@
  */
 
 import type { IBufferLineStringCache, IBufferLineStringCacheEntry } from 'common/buffer/BufferLine';
+import { disposableTimeout } from 'common/Async';
+import type { IDisposable } from 'common/Lifecycle';
 
-export class BufferLineStringCache implements IBufferLineStringCache {
+const STRING_CACHE_CLEAR_DELAY_MS = 50;
+
+export class BufferLineStringCache implements IBufferLineStringCache, IDisposable {
   public generation: number = 0;
   public readonly entries: Set<IBufferLineStringCacheEntry> = new Set();
-
-  constructor(private readonly _onCacheUsed: () => void = () => { }) { }
+  private _clearTimeout: IDisposable | undefined;
 
   public touch(): void {
-    this._onCacheUsed();
+    this._scheduleClear();
   }
 
   public allocateEntry(): IBufferLineStringCacheEntry {
@@ -22,11 +25,13 @@ export class BufferLineStringCache implements IBufferLineStringCache {
       generation: this.generation
     };
     this.entries.add(entry);
-    this._onCacheUsed();
+    this._scheduleClear();
     return entry;
   }
 
   public clear(): void {
+    this._clearTimeout?.dispose();
+    this._clearTimeout = undefined;
     this.generation++;
     for (const entry of this.entries) {
       entry.value = undefined;
@@ -34,4 +39,16 @@ export class BufferLineStringCache implements IBufferLineStringCache {
     }
     this.entries.clear();
   }
+
+  public dispose(): void {
+    this.clear();
+  }
+
+  private _scheduleClear(): void {
+    this._clearTimeout?.dispose();
+    this._clearTimeout = disposableTimeout(() => {
+      this._clearTimeout = undefined;
+      this.clear();
+    }, STRING_CACHE_CLEAR_DELAY_MS);
+  }
 }