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src/services.js

@@ -82,7 +82,34 @@ function parseJavaVersion(javaPath, out) {
   return { path: javaPath, version: raw || 'unbekannt', major: major || 0, arch, info: vendorLine };
 }
 
-function scanJava() {
+// Ergebnis des Suchlaufs zwischenspeichern – die Suche kostet ~1 s
+let javaCache = null;
+let javaCacheFile = null;
+function setCacheDir(dir) { javaCacheFile = path.join(dir, 'java-cache.json'); }
+
+function scanJava(useCache = true) {
+  const MAX_AGE = 24 * 3600 * 1000;
+  if (useCache) {
+    if (javaCache && Date.now() - javaCache.at < MAX_AGE) return javaCache.list;
+    // Cache von der Platte (gilt auch direkt nach dem Start)
+    if (javaCacheFile) {
+      try {
+        const c = JSON.parse(fs.readFileSync(javaCacheFile, 'utf8'));
+        if (c && Date.now() - c.at < MAX_AGE && Array.isArray(c.list)
+            && c.list.every((j) => fs.existsSync(j.path))) {
+          javaCache = c;
+          return c.list;
+        }
+      } catch { /* kein oder unbrauchbarer Cache */ }
+    }
+  }
+  const list = scanJavaUncached();
+  javaCache = { at: Date.now(), list };
+  if (javaCacheFile) { try { fs.writeFileSync(javaCacheFile, JSON.stringify(javaCache)); } catch { /* egal */ } }
+  return list;
+}
+
+function scanJavaUncached() {
   const found = new Set();
 
   // 1) JAVA_HOME
@@ -257,7 +284,7 @@ async function modrinthProjectTitle(projectId) {
 }
 
 module.exports = {
-  scanJava, probeJava,
+  scanJava, probeJava, setCacheDir,
   getMcVersions,
   modrinthSearch, modrinthResolveFile, modrinthInstall, modrinthProjectTitle, downloadFile,
 };