initial work on multithreaded updates

Listing.cs

@@ -13,11 +13,13 @@ namespace Buypeeb {
 		// start_date, end_date
 		public int bids;
 		public bool auto_extension;
+		public bool ready;
 
 		public Listing(string url, string id, string name) {
 			this.url = url;
 			this.id = id;
 			this.name = name;
+			this.ready = false;
 		}
 
 		public void Update() {

MainWindow.cs

@@ -19,15 +19,18 @@ along with this program.  If not, see <https://www.gnu.org/licenses/>.
 using System;
 using System.Collections.Generic;
 using System.Text.RegularExpressions;
+// using System.Text.Json;
+using System.Threading;
+using System.Threading.Tasks;
 using Gtk;
 
 namespace Buypeeb {
-	enum ItemColumns {
+	public struct ItemColumns {
-		Name,
+		public static int Name = 0;
-		PriceYen,
+		public static int PriceYen = 1;
-		PriceAUD,
+		public static int PriceAUD = 2;
-		Ending,
+		public static int Ending = 3;
-		Id
+		public static int Id = 4;
 	}
 
 	class MainWindow : Window {
@@ -35,17 +38,21 @@ namespace Buypeeb {
 		private ListStore items;
 		private Settings settings;
 
+		static SemaphoreSlim tasklimit = new SemaphoreSlim(4);
+
 		public MainWindow() : this(new Builder("main.glade")) { }
 
 		private MainWindow(Builder builder) : base(builder.GetObject("wndMain").Handle) {
 			this.settings = new Settings();
 			this.settings.Save();
 			this.Title = "Buypeeb";
+
 			builder.Autoconnect(this);
 			this.items = (ListStore)builder.GetObject("ListItems");
 			this.RenderList();
+
 			foreach (object[] row in this.items) {
-				Console.WriteLine(row[(int)ItemColumns.Name]);
+				Console.WriteLine(row[ItemColumns.Name]);
 			}
 			DeleteEvent += Window_Shutdown;
 		}
@@ -56,6 +63,36 @@ namespace Buypeeb {
 
 		// general behaviour
 
+		private void UpdateThread(string id) {
+			var item = this.settings.watchlist[id];
+			Console.WriteLine($"Updating {id}...");
+			item.ready = false;
+			Thread.Sleep(3000);
+			string html = "Heeenlo";
+			item.name = html;
+			item.ready = true;
+			Console.WriteLine($"{id} updated.");
+			Gtk.Application.Invoke(delegate {
+				// this.RenderListItem(id);\
+				this.RenderList();
+			});
+		}
+
+		private void UpdateItem(string id) {
+			tasklimit.Wait();
+			var t = Task.Factory.StartNew(() => {
+				this.UpdateThread(id);
+			}).ContinueWith(task => { tasklimit.Release(); });
+		}
+
+		private void UpdateItems() {
+			var t = Task.Factory.StartNew(() => {
+				foreach (var item in this.settings.watchlist) {
+					this.UpdateItem(item.Key);
+				}
+			});
+		}
+
 		private (Boolean accepted, string response) EntryDialogue(string title = "Buypeeb", string message = "Hi there!") {
 			Dialog ed = new Dialog(title, null, Gtk.DialogFlags.DestroyWithParent, "Cancel", ResponseType.Cancel, "OK", ResponseType.Ok);
 			ed.DefaultResponse = ResponseType.Ok;
@@ -75,10 +112,6 @@ namespace Buypeeb {
 			return (accepted == ResponseType.Ok, response);
 		}
 
-		private void UpdateItems() {
-
-		}
-
 		private void RenderList() {
 			this.items.Clear();
 			foreach (KeyValuePair<string, Listing> entry in settings.watchlist) {
@@ -111,6 +144,7 @@ namespace Buypeeb {
 
 		private void ButtonUpdateAllClicked(object sender, EventArgs a) {
 			Console.WriteLine("ButtonUpdateAllClicked");
+			this.UpdateItems();
 		}
 
 		private void ButtonClearEndedClicked(object sender, EventArgs a) {

Settings.cs

@@ -26,8 +26,14 @@ namespace Buypeeb {
 				// ~/.config/Lynnear Software/buypeeb
 				this.location = Path.Combine(Environment.GetEnvironmentVariable("HOME"), ".config", "Lynnear Software", "buypeeb");
 			}
+
 			this.watchlist = new Dictionary<string, Listing>();
 			this.Watch("https://buypeeb.biz/whatever/k12345", "my thingy");
+			this.Watch("https://buypeeb.biz/whatever/z09876", "your thingy");
+			this.Watch("https://buypeeb.biz/whatever/h55555", "our thingy");
+			for (int i = 0; i < 10; i++) {
+				this.Watch($"https://buypeeb.biz/whatever/x{i * 123}", $"filler {i}");
+			}
 			this.watchlist["k12345"].Update();
 		}