1 files changed, 156 insertions, 0 deletions

diff --git a/OpenSim/Region/Framework/Scenes/AsyncInventorySender.cs b/OpenSim/Region/Framework/Scenes/AsyncInventorySender.cs
new file mode 100644
index 0000000..d9d2e64
--- /dev/null
+++ b/OpenSim/Region/Framework/Scenes/AsyncInventorySender.cs
@@ -0,0 +1,156 @@
+/*
+ * Copyright (c) Contributors, http://opensimulator.org/
+ * See CONTRIBUTORS.TXT for a full list of copyright holders.
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions are met:
+ *     * Redistributions of source code must retain the above copyright
+ *       notice, this list of conditions and the following disclaimer.
+ *     * Redistributions in binary form must reproduce the above copyright
+ *       notice, this list of conditions and the following disclaimer in the
+ *       documentation and/or other materials provided with the distribution.
+ *     * Neither the name of the OpenSimulator Project nor the
+ *       names of its contributors may be used to endorse or promote products
+ *       derived from this software without specific prior written permission.
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE DEVELOPERS ``AS IS'' AND ANY
+ * EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED
+ * WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
+ * DISCLAIMED. IN NO EVENT SHALL THE CONTRIBUTORS BE LIABLE FOR ANY
+ * DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES
+ * (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
+ * LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND
+ * ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
+ * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
+ * SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
+ */
+
+using System;
+using System.Collections.Generic;
+using System.Reflection;
+using System.Threading;
+using log4net;
+using OpenMetaverse;
+using OpenSim.Framework;
+using OpenSim.Region.Framework.Interfaces;
+
+namespace OpenSim.Region.Framework.Scenes
+{
+    class FetchHolder
+    {
+        public IClientAPI Client { get; private set; }
+        public UUID ItemID { get; private set; }
+
+        public FetchHolder(IClientAPI client, UUID itemID)
+        {
+            Client = client;
+            ItemID = itemID;
+        }
+    }
+
+    /// <summary>
+    /// Send FetchInventoryReply information to clients asynchronously on a single thread rather than asynchronously via
+    /// multiple threads.
+    /// </summary>
+    /// <remarks>
+    /// If the main root inventory is right-clicked on a version 1 viewer for a user with a large inventory, a very
+    /// very large number of FetchInventory requests are sent to the simulator.  Each is handled on a separate thread
+    /// by the IClientAPI, but the sheer number of requests overwhelms the number of threads available and ends up
+    /// freezing the inbound packet handling.
+    ///
+    /// This class makes the first FetchInventory packet thread process the queue.  If new requests come
+    /// in while it is processing, then the subsequent threads just add the requests and leave it to the original
+    /// thread to process them.
+    ///
+    /// This might slow down outbound packets but these are limited by the IClientAPI outbound queues
+    /// anyway.
+    ///
+    /// It might be possible to ignore FetchInventory requests altogether, particularly as they are redundant wrt to
+    /// FetchInventoryDescendents requests, but this would require more investigation.
+    /// </remarks>
+    public class AsyncInventorySender
+    {
+//        private static readonly ILog m_log = LogManager.GetLogger(MethodBase.GetCurrentMethod().DeclaringType);
+
+        protected Scene m_scene;
+
+        /// <summary>
+        /// Queues fetch requests
+        /// </summary>
+        Queue<FetchHolder> m_fetchHolder = new Queue<FetchHolder>();
+
+        /// <summary>
+        /// Signal whether a queue is currently being processed or not.
+        /// </summary>
+        protected volatile bool m_processing;
+
+        public AsyncInventorySender(Scene scene)
+        {
+            m_processing = false;
+            m_scene = scene;
+        }
+
+        /// <summary>
+        /// Handle a fetch inventory request from the client
+        /// </summary>
+        /// <param name="remoteClient"></param>
+        /// <param name="itemID"></param>
+        /// <param name="ownerID"></param>
+        public void HandleFetchInventory(IClientAPI remoteClient, UUID itemID, UUID ownerID)
+        {
+            lock (m_fetchHolder)
+            {
+//                m_log.DebugFormat(
+//                    "[ASYNC INVENTORY SENDER]: Putting request from {0} for {1} on queue", remoteClient.Name, itemID);
+
+                m_fetchHolder.Enqueue(new FetchHolder(remoteClient, itemID));
+            }
+
+            if (!m_processing)
+            {
+                m_processing = true;
+                ProcessQueue();
+            }
+        }
+
+        /// <summary>
+        /// Process the queue of fetches
+        /// </summary>
+        protected void ProcessQueue()
+        {
+            FetchHolder fh = null;
+
+            while (true)
+            {
+                lock (m_fetchHolder)
+                {
+//                    m_log.DebugFormat("[ASYNC INVENTORY SENDER]: {0} items left to process", m_fetchHolder.Count);
+
+                    if (m_fetchHolder.Count == 0)
+                    {
+                        m_processing = false;
+                        return;
+                    }
+                    else
+                    {
+                        fh = m_fetchHolder.Dequeue();
+                    }
+                }
+
+                if (!fh.Client.IsActive)
+                    continue;
+
+//                m_log.DebugFormat(
+//                    "[ASYNC INVENTORY SENDER]: Handling request from {0} for {1} on queue", fh.Client.Name, fh.ItemID);
+
+                InventoryItemBase item = new InventoryItemBase(fh.ItemID, fh.Client.AgentId);
+                item = m_scene.InventoryService.GetItem(item);
+    
+                if (item != null)
+                    fh.Client.SendInventoryItemDetails(item.Owner, item);
+    
+                 // TODO: Possibly log any failure
+            }
+        }
+    }
+}
\ No newline at end of file