From 063754f6530d89f7f3fd16023ba81ed65654e788 Mon Sep 17 00:00:00 2001
From: Claudio Cambra <claudio.cambra@nextcloud.com>
Date: Mon, 20 Mar 2023 15:02:29 +0100
Subject: [PATCH] Parallelise conversion of NKFiles to
 NextclkoudItemMetadataTables

Signed-off-by: Claudio Cambra <claudio.cambra@nextcloud.com>
---
 .../NextcloudItemMetadataTable+NKFile.swift   | 29 ++++++++++++-------
 1 file changed, 19 insertions(+), 10 deletions(-)

diff --git a/shell_integration/MacOSX/NextcloudIntegration/FileProviderExt/Database/NextcloudItemMetadataTable+NKFile.swift b/shell_integration/MacOSX/NextcloudIntegration/FileProviderExt/Database/NextcloudItemMetadataTable+NKFile.swift
index 305d9cb0b6004..fa7860364366f 100644
--- a/shell_integration/MacOSX/NextcloudIntegration/FileProviderExt/Database/NextcloudItemMetadataTable+NKFile.swift
+++ b/shell_integration/MacOSX/NextcloudIntegration/FileProviderExt/Database/NextcloudItemMetadataTable+NKFile.swift
@@ -98,21 +98,30 @@ extension NextcloudItemMetadataTable {
         var childDirectoriesMetadatas: [NextcloudItemMetadataTable] = []
         var metadatas: [NextcloudItemMetadataTable] = []
 
+        let conversionQueue = DispatchQueue(label: "nkFileToMetadataConversionQueue", qos: .userInitiated, attributes: .concurrent)
+        let appendQueue = DispatchQueue(label: "metadataAppendQueue", qos: .userInitiated)
+        let dispatchGroup = DispatchGroup()
+
         for file in files {
-            let metadata = NextcloudItemMetadataTable.fromNKFile(file, account: account)
+            conversionQueue.async(group: dispatchGroup) {
+                let metadata = NextcloudItemMetadataTable.fromNKFile(file, account: account)
 
-            if metadatas.isEmpty && !directoryMetadataSet {
-                assert(metadata.directory) // In directory read first metadata will always be a dir
-                directoryMetadata = metadata;
-                directoryMetadataSet = true;
-            } else {
-                metadatas.append(metadata)
-                if metadata.directory {
-                    childDirectoriesMetadatas.append(metadata)
+                if metadatas.isEmpty && !directoryMetadataSet {
+                    directoryMetadata = metadata;
+                    directoryMetadataSet = true;
+                } else {
+                    appendQueue.async(group: dispatchGroup) {
+                        metadatas.append(metadata)
+                        if metadata.directory {
+                            childDirectoriesMetadatas.append(metadata)
+                        }
+                    }
                 }
             }
         }
 
-        completionHandler(directoryMetadata, childDirectoriesMetadatas, metadatas)
+        dispatchGroup.notify(queue: DispatchQueue.main) {
+            completionHandler(directoryMetadata, childDirectoriesMetadatas, metadatas)
+        }
     }
 }