Add ProcessingQueue (nw)

MPF.Library/Utilities/ProcessingQueue.cs

@@ -0,0 +1,46 @@
+using System;
+using System.Collections.Concurrent;
+using System.Threading.Tasks;
+
+namespace MPF.Utilities
+{
+    internal class ProcessingQueue<T>
+    {
+        /// <summary>
+        /// Internal queue to hold data to process
+        /// </summary>
+        private readonly ConcurrentQueue<T> InternalQueue;
+
+        /// <summary>
+        /// Custom processing step for dequeued data
+        /// </summary>
+        private readonly Action<T> CustomProcessing;
+
+        public ProcessingQueue(Action<T> customProcessing)
+        {
+            this.InternalQueue = new ConcurrentQueue<T>();
+            this.CustomProcessing = customProcessing;
+            Task.Run(() => ProcessQueue());
+        }
+
+        /// <summary>
+        /// Process
+        /// </summary>
+        private void ProcessQueue()
+        {
+            while (true)
+            {
+                // Nothing in the queue means we get to idle
+                if (InternalQueue.Count == 0)
+                    continue;
+
+                // Get the next item from the queue
+                if (!InternalQueue.TryDequeue(out T nextItem))
+                    continue;
+
+                // Invoke the lambda, if possible
+                this.CustomProcessing?.Invoke(nextItem);
+            }
+        }
+    }
+}