From fd4022ba843d3be83de513feb96ec61f33992cbe Mon Sep 17 00:00:00 2001
From: Matt Nadareski <mnadareski@outlook.com>
Date: Mon, 29 Mar 2021 10:23:34 -0700
Subject: [PATCH] Add ProcessingQueue (nw)

---
 MPF.Library/Utilities/ProcessingQueue.cs | 46 ++++++++++++++++++++++++
 1 file changed, 46 insertions(+)
 create mode 100644 MPF.Library/Utilities/ProcessingQueue.cs

diff --git a/MPF.Library/Utilities/ProcessingQueue.cs b/MPF.Library/Utilities/ProcessingQueue.cs
new file mode 100644
index 00000000..83edca3b
--- /dev/null
+++ b/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);
+            }
+        }
+    }
+}