feat(ADM-018): completed feature

project/src/modules/cache/infrastructure/in-memory-cache-adapter.ts

@@ -0,0 +1,31 @@
+import type { CacheAdapter } from '../domain/ports.js';
+
+/** In-memory cache adapter for v1. Swap with Redis adapter later. */
+export class InMemoryCacheAdapter implements CacheAdapter {
+  private readonly store = new Map<string, { value: unknown; expiresAt: number }>();
+
+  async get<T>(key: string): Promise<T | undefined> {
+    const entry = this.store.get(key);
+    if (!entry) return undefined;
+    if (entry.expiresAt < Date.now()) {
+      this.store.delete(key);
+      return undefined;
+    }
+    return entry.value as T;
+  }
+
+  async set<T>(key: string, value: T, ttlSeconds: number): Promise<void> {
+    this.store.set(key, { value, expiresAt: Date.now() + ttlSeconds * 1000 });
+  }
+
+  async invalidate(key: string): Promise<void> {
+    if (this.store.has(key)) {
+      this.store.delete(key);
+      return;
+    }
+    // Pattern-like invalidation: drop any key containing this fragment.
+    for (const existing of [...this.store.keys()]) {
+      if (existing.includes(key)) this.store.delete(existing);
+    }
+  }
+}