88 lines
2.3 KiB
C#
88 lines
2.3 KiB
C#
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using System;
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namespace Lidgren.Network
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{
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internal sealed class NetReliableOrderedReceiver : NetReceiverChannelBase
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{
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private int m_windowStart;
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private int m_windowSize;
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private NetBitVector m_earlyReceived;
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internal NetIncomingMessage[] m_withheldMessages;
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public NetReliableOrderedReceiver(NetConnection connection, int windowSize)
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: base(connection)
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{
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m_windowSize = windowSize;
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m_withheldMessages = new NetIncomingMessage[windowSize];
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m_earlyReceived = new NetBitVector(windowSize);
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}
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private void AdvanceWindow()
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{
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m_earlyReceived.Set(m_windowStart % m_windowSize, false);
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m_windowStart = (m_windowStart + 1) % NetConstants.NumSequenceNumbers;
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}
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internal override void ReceiveMessage(NetIncomingMessage message)
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{
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int relate = NetUtility.RelativeSequenceNumber(message.m_sequenceNumber, m_windowStart);
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// ack no matter what
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m_connection.QueueAck(message.m_receivedMessageType, message.m_sequenceNumber);
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if (relate == 0)
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{
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// Log("Received message #" + message.SequenceNumber + " right on time");
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//
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// excellent, right on time
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//
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//m_peer.LogVerbose("Received RIGHT-ON-TIME " + message);
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AdvanceWindow();
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m_peer.ReleaseMessage(message);
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// release withheld messages
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int nextSeqNr = (message.m_sequenceNumber + 1) % NetConstants.NumSequenceNumbers;
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while (m_earlyReceived[nextSeqNr % m_windowSize])
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{
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message = m_withheldMessages[nextSeqNr % m_windowSize];
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NetException.Assert(message != null);
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// remove it from withheld messages
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m_withheldMessages[nextSeqNr % m_windowSize] = null;
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m_peer.LogVerbose("Releasing withheld message #" + message);
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m_peer.ReleaseMessage(message);
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AdvanceWindow();
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nextSeqNr++;
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}
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return;
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}
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if (relate < 0)
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{
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m_peer.LogVerbose("Received message #" + message.m_sequenceNumber + " DROPPING DUPLICATE");
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// duplicate
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return;
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}
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// relate > 0 = early message
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if (relate > m_windowSize)
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{
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// too early message!
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m_peer.LogDebug("Received " + message + " TOO EARLY! Expected " + m_windowStart);
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return;
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}
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m_earlyReceived.Set(message.m_sequenceNumber % m_windowSize, true);
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m_peer.LogVerbose("Received " + message + " WITHHOLDING, waiting for " + m_windowStart);
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m_withheldMessages[message.m_sequenceNumber % m_windowSize] = message;
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}
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}
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}
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