riversong code showcase

Source/Engine/Core/Attributes/DisableDiscoveryAttribute.cs

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+using System;
+
+namespace DanieleMarotta.RiversongCodeShowcase
+{
+    [AttributeUsage(AttributeTargets.Class)]
+    public class DisableDiscoveryAttribute : Attribute
+    {
+    }
+}

Source/Engine/Core/Attributes/GameSystemGroupAttribute.cs

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+using System;
+
+namespace DanieleMarotta.RiversongCodeShowcase
+{
+    [AttributeUsage(AttributeTargets.Class)]
+    public class GameSystemGroupAttribute : Attribute
+    {
+        public GameSystemGroupAttribute(Type systemGroupType)
+        {
+            SystemGroupType = systemGroupType;
+        }
+
+        public Type SystemGroupType { get; set; }
+    }
+}

Source/Engine/Core/Attributes/InjectServiceAttribute.cs

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+using System;
+
+namespace DanieleMarotta.RiversongCodeShowcase
+{
+    [AttributeUsage(AttributeTargets.Field)]
+    public class InjectServiceAttribute : Attribute
+    {
+        public InjectServiceAttribute(Type serviceType = null)
+        {
+            ServiceType = serviceType;
+        }
+
+        public Type ServiceType { get; set; }
+    }
+}

Source/Engine/Core/Attributes/ServiceAttribute.cs

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+using System;
+
+namespace DanieleMarotta.RiversongCodeShowcase
+{
+    [AttributeUsage(AttributeTargets.Class, AllowMultiple = true)]
+    public class ServiceAttribute : Attribute
+    {
+        public ServiceAttribute(Type serviceType = null)
+        {
+            ServiceType = serviceType;
+        }
+
+        public Type ServiceType { get; set; }
+    }
+}

Source/Engine/Core/Attributes/SortingAttributes.cs

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+using System;
+
+namespace DanieleMarotta.RiversongCodeShowcase
+{
+    [AttributeUsage(AttributeTargets.Class, AllowMultiple = true)]
+    public class SortingAttribute : Attribute
+    {
+        protected SortingAttribute(Type systemType)
+        {
+            SystemType = systemType;
+        }
+
+        public Type SystemType { get; set; }
+    }
+
+    public class InitializeAfterAttribute : SortingAttribute
+    {
+        public InitializeAfterAttribute(Type systemType) : base(systemType)
+        {
+        }
+    }
+
+    public class InitializeBeforeAttribute : SortingAttribute
+    {
+        public InitializeBeforeAttribute(Type systemType) : base(systemType)
+        {
+        }
+    }
+
+    public class UpdateAfterAttribute : SortingAttribute
+    {
+        public UpdateAfterAttribute(Type systemType) : base(systemType)
+        {
+        }
+    }
+
+    public class UpdateBeforeAttribute : SortingAttribute
+    {
+        public UpdateBeforeAttribute(Type systemType) : base(systemType)
+        {
+        }
+    }
+
+    public class DisposeAfterAttribute : SortingAttribute
+    {
+        public DisposeAfterAttribute(Type systemType) : base(systemType)
+        {
+        }
+    }
+
+    public class DisposeBeforeAttribute : SortingAttribute
+    {
+        public DisposeBeforeAttribute(Type systemType) : base(systemType)
+        {
+        }
+    }
+}