Merge pull request 'feature/multi-threading' (#2) from feature/multi-threading into main

Reviewed-on: #2

src/Chksum/chksum.cs

@@ -1,3 +1,4 @@
+using System.Collections.Concurrent;
 using System.Reflection;
 using System.Security.Cryptography;
 using Microsoft.Data.Sqlite;
@@ -71,7 +72,7 @@ public class ChksumUtils {
     }
 
     private Dictionary<string, string> CalculateChecksums(string[] filenames) {
-        Dictionary<string, string> checksums = new Dictionary<string, string>();
+        ConcurrentDictionary<string, string> checksums = new ConcurrentDictionary<string, string>();
 
         Parallel.ForEach(filenames, (filename, state) => {
             using (var md5 = MD5.Create()) {
@@ -80,13 +81,13 @@ public class ChksumUtils {
                     var checksum = BitConverter.ToString(hash).Replace("-", "").ToLowerInvariant();
 
                     lock (checksums) {
-                        checksums.Add(filename, checksum);
+                        checksums.TryAdd(filename, checksum);
                     }
                 }
             }
         });
 
-        return checksums;
+        return new Dictionary<string, string>(checksums);
     }
 
     public void doTheThing() {
@@ -180,7 +181,7 @@ public class ChksumUtils {
                 command2.Parameters.AddWithValue("$filehash", fileHash);
                 command2.ExecuteNonQuery();
 
-                Console.WriteLine("File moved:");
+                Console.WriteLine("File moved or is a duplicate:");
                 Console.WriteLine($"\tfrom\t{pathToFile}");
                 Console.WriteLine($"\tto  \t{pathtofile}\n");
                 wasMoved = true;
@@ -251,7 +252,6 @@ public class ChksumUtils {
 
     public void compareDatabases(string filePathToOtherDatabase) {
         List<string> filesThatDoNotExistsInTheRemote = getFilehashesFromDatabase("Data Source=" + DatabaseRoot + "chksum.db;Mode=ReadOnly").Except(getFilehashesFromDatabase("Data Source=" + filePathToOtherDatabase + ";Mode=ReadOnly")).ToList();
-        //List<string> filesThatDoNotExistsInTheOrigin = filehashesOfRemoteDatabase.Except(filehashesOfOriginDatabase).ToList();
 
         foreach (string file in filesThatDoNotExistsInTheRemote) {
             using (var connection = new SqliteConnection("Data Source=" + DatabaseRoot + "chksum.db;Mode=ReadOnly")) {