From 79496381fc68cbd30ff5a95d1f05fcb18c6b1a93 Mon Sep 17 00:00:00 2001
From: Adam Johnson
Date: Fri, 28 Dec 2007 08:51:39 +0000
Subject: Patch from Johan: LibSL updated to the latest revision (1568) and all
 packets are now recycled to improve performance and memory usage.

---
 OpenSim/Framework/PacketPool.cs | 131 ++++++++++++++++++++++++++++++++++++++++
 1 file changed, 131 insertions(+)
 create mode 100644 OpenSim/Framework/PacketPool.cs

(limited to 'OpenSim/Framework/PacketPool.cs')

diff --git a/OpenSim/Framework/PacketPool.cs b/OpenSim/Framework/PacketPool.cs
new file mode 100644
index 0000000..2b33d0b
--- /dev/null
+++ b/OpenSim/Framework/PacketPool.cs
@@ -0,0 +1,131 @@
+/*
+* 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 OpenSim 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;
+using libsecondlife.Packets;
+
+namespace OpenSim.Framework
+{
+    public sealed class PacketPool
+    {
+        // Set up a thread-safe singleton pattern
+        static PacketPool()
+        {
+        }
+
+        private static readonly PacketPool instance = new PacketPool();
+
+        public static PacketPool Instance
+        {
+            get { return instance; }
+        }
+
+        private Hashtable pool = new Hashtable();
+
+        public Packet GetPacket(PacketType type)
+        {
+            Packet packet = null;
+
+            lock (pool)
+            {
+                if (pool[type] == null || ((Stack) pool[type]).Count == 0)
+                {
+                    // Creating a new packet if we cannot reuse an old package
+                    packet = Packet.BuildPacket(type);
+                }
+                else
+                {
+                    // Recycle old packages
+                    packet = (Packet) ((Stack) pool[type]).Pop();
+                }
+            }
+
+            return packet;
+        }
+
+       private byte[] decoded_header = new byte[10];
+        private PacketType GetType(byte[] bytes)
+        {
+            ushort id;
+            libsecondlife.PacketFrequency freq;
+
+            Buffer.BlockCopy(bytes, 0, decoded_header, 0, 10);
+
+            if((bytes[0] & libsecondlife.Helpers.MSG_ZEROCODED)!=0)
+            {
+                libsecondlife.Helpers.ZeroDecodeCommand(bytes, decoded_header);
+            }
+
+            if (decoded_header[6] == 0xFF)
+            {
+                if (decoded_header[7] == 0xFF)
+                {
+                    id = (ushort)((decoded_header[8] << 8) + decoded_header[9]);
+                    freq = libsecondlife.PacketFrequency.Low;
+                }
+                else
+                {
+                    id = (ushort)decoded_header[7];
+                    freq = libsecondlife.PacketFrequency.Medium;
+                }
+            }
+            else
+            {
+                id = (ushort)decoded_header[6];
+                freq = libsecondlife.PacketFrequency.High;
+            }
+ 
+            return Packet.GetType(id, freq);
+        }
+
+        public Packet GetPacket(byte[] bytes, ref int packetEnd, byte[] zeroBuffer)
+        {
+            PacketType type = GetType(bytes);
+
+            int i = 0;
+            Packet packet = GetPacket(type);
+            packet.FromBytes(bytes, ref i, ref packetEnd, zeroBuffer);
+            return packet;
+        }
+
+        public void ReturnPacket(Packet packet) 
+        {
+            lock (pool)
+            {
+                PacketType type = packet.Type;
+
+                if (pool[type] == null)
+                {
+                    pool[type] = new Stack();
+                }
+
+                ((Stack) pool[type]).Push(packet);
+            }
+        }
+    }
+}
-- 
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