Weighing: Add ICommandScale and IEventScale

Elwig/Helpers/Weighing/ICommandScale.cs

@@ -0,0 +1,35 @@
+using System.Threading.Tasks;
+
+namespace Elwig.Helpers.Weighing {
+    /// <summary>
+    /// Interface for controlling a a scale which responds to commands sent to it
+    /// </summary>
+    public interface ICommandScale : IScale {
+        /// <summary>
+        /// Get the current weight on the scale without performing a weighing process
+        /// </summary>
+        /// <returns>Result of the weighing process (probably without a weighing id)</returns>
+        Task<WeighingResult> GetCurrentWeight();
+
+        /// <summary>
+        /// Perform a weighing process
+        /// </summary>
+        /// <returns>Result of the weighing process (including a weighing id)</returns>
+        Task<WeighingResult> Weigh();
+
+        /// <summary>
+        /// Empty the scale container or grant clearance to do so
+        /// </summary>
+        Task Empty();
+
+        /// <summary>
+        /// Grant clearance to fill the scale container
+        /// </summary>
+        Task GrantFillingClearance();
+
+        /// <summary>
+        /// Revoke clearance to fill the scale container
+        /// </summary>
+        Task RevokeFillingClearance();
+    }
+}