Add database-based configuration for rulesets

osu.Game/Configuration/DatabasedConfigManager.cs

@@ -0,0 +1,67 @@
+// Copyright (c) 2007-2018 ppy Pty Ltd <contact@ppy.sh>.
+// Licensed under the MIT Licence - https://raw.githubusercontent.com/ppy/osu/master/LICENCE
+
+using System.Collections.Generic;
+using System.Linq;
+using osu.Framework.Configuration;
+using osu.Game.Rulesets;
+
+namespace osu.Game.Configuration
+{
+    public abstract class DatabasedConfigManager<T> : ConfigManager<T>
+        where T : struct
+    {
+        private readonly SettingsStore settings;
+
+        private readonly List<DatabasedSetting> databasedSettings;
+
+        private readonly RulesetInfo ruleset;
+
+        protected DatabasedConfigManager(SettingsStore settings, RulesetInfo ruleset = null)
+        {
+            this.settings = settings;
+            this.ruleset = ruleset;
+
+            databasedSettings = settings.Query(ruleset?.ID);
+
+            InitialiseDefaults();
+        }
+
+        protected override void PerformLoad()
+        {
+        }
+
+        protected override bool PerformSave()
+        {
+            return true;
+        }
+
+        protected override void AddBindable<TBindable>(T lookup, Bindable<TBindable> bindable)
+        {
+            base.AddBindable(lookup, bindable);
+
+            var setting = databasedSettings.FirstOrDefault(s => (int)s.Key == (int)(object)lookup);
+            if (setting != null)
+            {
+                bindable.Parse(setting.Value);
+            }
+            else
+            {
+                settings.Update(setting = new DatabasedSetting
+                {
+                    Key = lookup,
+                    Value = bindable.Value,
+                    RulesetID = ruleset?.ID
+                });
+
+                databasedSettings.Add(setting);
+            }
+
+            bindable.ValueChanged += v =>
+            {
+                setting.Value = v;
+                settings.Update(setting);
+            };
+        }
+    }
+}