Initial commit

Author: Pim De Witte

UnityMainThreadDispatcher.cs

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+using UnityEngine;
+using System.Collections;
+using System.Collections.Generic;
+using System;
+
+/// <summary>
+/// A thread-safe class which holds a queue with actions to execute on the next Update() method. It can be used to make calls to the main thread for 
+/// things such as UI Manipulation in Unity. It was developed for use in combination with the Firebase Unity plugin, which uses separate threads for event handling
+/// </summary>
+public class UnityMainThreadDispatcher : MonoBehaviour {
+
+	private readonly static Queue<Action> _executionQueue = new Queue<Action>();
+
+	public void Update() {
+		while (_executionQueue.Count > 0)
+		{
+			_executionQueue.Dequeue().Invoke();
+		}
+	}
+
+	/// <summary>
+	/// Locks the queue and adds the action to the queue
+	/// </summary>
+	/// <param name="action">IEnumerator function that will be executed from the main thread.</param>
+	public void AddAction(IEnumerator action) {
+		lock (_executionQueue) {
+			_executionQueue.Enqueue (() => {  
+				StartCoroutine (action); 
+			});
+		}
+	}
+
+
+	private static UnityMainThreadDispatcher _instance = null;
+	private bool _isInitialized = false;
+
+	public static bool Exists() {
+		return _instance != null;
+	}
+		
+	public static UnityMainThreadDispatcher Instance() {
+		if (!Exists ()) {
+			throw new Exception ("UnityMainThreadDispatcher could not find the UnityMainThreadDispatcher object. Please ensure you have added the MainThreadExecutor Prefab to your scene.");
+		} 
+		return _instance;
+	}
+		
+
+	void Awake() {
+		if (_instance == null) {
+			_instance = this;
+			DontDestroyOnLoad(this.gameObject);
+		}
+	}
+
+	void OnDestroy() {
+			_instance = null;
+	}
+
+		
+}
+
+

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