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08d8a3e580
Often, by the time the UDPServer realizes that an entity update packet has not been acknowledged, there is a newer update for the same entity already queued up or there is a higher priority update that should be sent first. This patch eliminates 1:1 packet resends for unacked entity update packets. Insteawd, unacked update packets are decomposed into the original entity updates and those updates are placed back into the priority queues based on their new priority but the original update timestamp. This will generally place them at the head of the line to be put back on the wire as a new outgoing packet but prevents the resend queue from filling up with multiple stale updates for the same entity. This new approach takes advantage of the UDP nature of the Linden protocol in that the intent of a reliable update packet is that if it goes unacknowledge, SOMETHING has to happen to get the update to the client. We are simply making sure that we are resending current object state rather than stale object state. Additionally, this patch includes a generalized callback mechanism so that any caller can specify their own method to call when a packet expires without being acknowledged. We use this mechanism to requeue update packets and otherwise use the UDPServer default method of just putting expired packets in the resend queue.
75 lines
3.6 KiB
C#
75 lines
3.6 KiB
C#
/*
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* Copyright (c) Contributors, http://opensimulator.org/
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* See CONTRIBUTORS.TXT for a full list of copyright holders.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions are met:
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* * Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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* * Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in the
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* documentation and/or other materials provided with the distribution.
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* * Neither the name of the OpenSimulator Project nor the
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* names of its contributors may be used to endorse or promote products
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* derived from this software without specific prior written permission.
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*
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* THIS SOFTWARE IS PROVIDED BY THE DEVELOPERS ``AS IS'' AND ANY
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* EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED
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* WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
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* DISCLAIMED. IN NO EVENT SHALL THE CONTRIBUTORS BE LIABLE FOR ANY
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* DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES
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* (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
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* LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND
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* ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
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* (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
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* SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
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*/
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using System;
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using OpenSim.Framework;
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using OpenMetaverse;
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namespace OpenSim.Region.ClientStack.LindenUDP
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{
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public delegate void UnackedPacketMethod();
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/// <summary>
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/// Holds a reference to the <seealso cref="LLUDPClient"/> this packet is
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/// destined for, along with the serialized packet data, sequence number
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/// (if this is a resend), number of times this packet has been resent,
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/// the time of the last resend, and the throttling category for this
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/// packet
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/// </summary>
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public sealed class OutgoingPacket
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{
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/// <summary>Client this packet is destined for</summary>
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public LLUDPClient Client;
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/// <summary>Packet data to send</summary>
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public UDPPacketBuffer Buffer;
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/// <summary>Sequence number of the wrapped packet</summary>
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public uint SequenceNumber;
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/// <summary>Number of times this packet has been resent</summary>
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public int ResendCount;
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/// <summary>Environment.TickCount when this packet was last sent over the wire</summary>
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public int TickCount;
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/// <summary>Category this packet belongs to</summary>
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public ThrottleOutPacketType Category;
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/// <summary>The delegate to be called if this packet is determined to be unacknowledged</summary>
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public UnackedPacketMethod UnackedMethod;
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/// <summary>
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/// Default constructor
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/// </summary>
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/// <param name="client">Reference to the client this packet is destined for</param>
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/// <param name="buffer">Serialized packet data. If the flags or sequence number
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/// need to be updated, they will be injected directly into this binary buffer</param>
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/// <param name="category">Throttling category for this packet</param>
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public OutgoingPacket(LLUDPClient client, UDPPacketBuffer buffer, ThrottleOutPacketType category, UnackedPacketMethod method)
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{
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Client = client;
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Buffer = buffer;
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Category = category;
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UnackedMethod = method;
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}
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}
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}
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