Editing OpenSimulator Internals/Code Map/LLUDPServer (section)

== Key Structures ==

=== packetInbox ===

A <code>BlockingCollection&lt;IncomingPacket&gt;</code>. The receive thread
produces; the <code>IncomingPacketHandler</code> thread consumes. Bounded only
by memory.

=== TokenBucket / ThrottleRates ===

<code>Throttle</code> is a scene-wide token bucket capping total outbound
bandwidth. <code>ThrottleRates</code> holds the per-client default rates for
each traffic category (resend, texture, asset, land, wind, cloud, task,
state, AvatarInfo). Both are configured from <code>[ClientStack.LindenUDP]</code>.

=== Pending cache ===

An <code>ExpiringCacheOS&lt;IPEndPoint, Queue&lt;UDPPacketBuffer&gt;&gt;</code>
keyed by endpoint. While a new client is being set up after a UseCircuitCode,
all arriving packets for that endpoint are held here and reinjected once the
client is ready. Entries expire after 60 seconds.

=== OqrEngine ===

<code>JobEngine</code> instance named "Outgoing Queue Refill Engine". When a
client's outbound queue runs dry, a refill job is posted here rather than
blocking the outgoing packet handler thread. This prevents one slow client
from stalling outbound processing for all others.

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