Initial Commit

Assets/Oculus/Platform/Scripts/Callback.cs

@@ -0,0 +1,189 @@
+namespace Oculus.Platform
+{
+    using UnityEngine;
+    using System;
+    using System.Collections.Generic;
+
+    public static class Callback
+    {
+        #region Notification Callbacks: Exposed through Oculus.Platform.Platform
+
+        internal static void SetNotificationCallback<T>(Message.MessageType type, Message<T>.Callback callback)
+        {
+            if (callback == null)
+            {
+                throw new Exception("Cannot provide a null notification callback.");
+            }
+
+            notificationCallbacks[type] = new RequestCallback<T>(callback);
+
+            if (type == Message.MessageType.Notification_GroupPresence_JoinIntentReceived)
+            {
+                FlushJoinIntentNotificationQueue();
+            }
+        }
+
+        internal static void SetNotificationCallback(Message.MessageType type, Message.Callback callback)
+        {
+            if (callback == null)
+            {
+                throw new Exception("Cannot provide a null notification callback.");
+            }
+
+            notificationCallbacks[type] = new RequestCallback(callback);
+        }
+
+        #endregion
+
+        #region Adding and running request handlers
+
+        internal static void AddRequest(Request request)
+        {
+            if (request.RequestID == 0)
+            {
+                // An early out error happened in the C SDK. Do not add it to the mapping of callbacks
+                Debug.LogError("An unknown error occurred. Request failed.");
+                return;
+            }
+
+            requestIDsToRequests[request.RequestID] = request;
+        }
+
+        internal static void RunCallbacks()
+        {
+            while (true)
+            {
+                var msg = Platform.Message.PopMessage();
+                if (msg == null)
+                {
+                    break;
+                }
+
+                HandleMessage(msg);
+            }
+        }
+
+        internal static void RunLimitedCallbacks(uint limit)
+        {
+            for (var i = 0; i < limit; ++i)
+            {
+                var msg = Platform.Message.PopMessage();
+                if (msg == null)
+                {
+                    break;
+                }
+
+                HandleMessage(msg);
+            }
+        }
+
+        internal static void OnApplicationQuit()
+        {
+            // Clear out all outstanding callbacks
+            requestIDsToRequests.Clear();
+            notificationCallbacks.Clear();
+        }
+
+        #endregion
+
+        #region Callback Internals
+
+        private static Dictionary<ulong, Request> requestIDsToRequests = new Dictionary<ulong, Request>();
+
+        private static Dictionary<Message.MessageType, RequestCallback> notificationCallbacks =
+            new Dictionary<Message.MessageType, RequestCallback>();
+
+        private static bool hasRegisteredJoinIntentNotificationHandler = false;
+        private static Message latestPendingJoinIntentNotifications;
+
+        private static void FlushJoinIntentNotificationQueue()
+        {
+            hasRegisteredJoinIntentNotificationHandler = true;
+            if (latestPendingJoinIntentNotifications != null)
+            {
+                HandleMessage(latestPendingJoinIntentNotifications);
+            }
+
+            latestPendingJoinIntentNotifications = null;
+        }
+
+        private class RequestCallback
+        {
+            private Message.Callback messageCallback;
+
+            public RequestCallback()
+            {
+            }
+
+            public RequestCallback(Message.Callback callback)
+            {
+                this.messageCallback = callback;
+            }
+
+            public virtual void HandleMessage(Message msg)
+            {
+                if (messageCallback != null)
+                {
+                    messageCallback(msg);
+                }
+            }
+        }
+
+        private sealed class RequestCallback<T> : RequestCallback
+        {
+            private Message<T>.Callback callback;
+
+            public RequestCallback(Message<T>.Callback callback)
+            {
+                this.callback = callback;
+            }
+
+            public override void HandleMessage(Message msg)
+            {
+                if (callback != null)
+                {
+                    if (msg is Message<T>)
+                    {
+                        callback((Message<T>)msg);
+                    }
+                    else
+                    {
+                        Debug.LogError("Unable to handle message: " + msg.GetType());
+                    }
+                }
+            }
+        }
+
+        internal static void HandleMessage(Message msg)
+        {
+            Request request;
+            if (msg.RequestID != 0 && requestIDsToRequests.TryGetValue(msg.RequestID, out request))
+            {
+                try
+                {
+                    request.HandleMessage(msg);
+                }
+                finally
+                {
+                    requestIDsToRequests.Remove(msg.RequestID);
+                }
+
+                return;
+            }
+
+            RequestCallback callbackHolder;
+            if (notificationCallbacks.TryGetValue(msg.Type, out callbackHolder))
+            {
+                callbackHolder.HandleMessage(msg);
+            }
+            // We need to queue up Join Intents because the callback runner will be called before a handler has beeen set.
+            else if (!hasRegisteredJoinIntentNotificationHandler &&
+                     msg.Type == Message.MessageType.Notification_GroupPresence_JoinIntentReceived)
+            {
+                latestPendingJoinIntentNotifications = msg;
+            }
+        }
+
+        #endregion
+    }
+}