perf: Zero-alloc interpolation for SendMessage/Overhead APIs (#2434)
## Summary Phase 1 of a multi-phase optimization to eliminate intermediate string allocations between `$"..."` interpolation and the packet text region for ModernUO's player-facing message APIs. - Adds `[InterpolatedStringHandler]` overloads to every `Send*`/`Public/Local/Private/NonlocalOverheadMessage`/`Say`/`Emote`/`Whisper`/`Yell`/`SendLocalizedMessageTo` API in `OutgoingMessagePackets`, `Mobile`, and `Item`. Each overload is a 3-line shim that forwards `handler.Text` to the existing span-based path then calls `handler.Clear()` to return the rented `STArrayPool<char>` buffer (matches the established `SpanWriter.WriteAscii(ref RawInterpolatedStringHandler)` precedent). - Converts `string text/args/affix/name` parameters to `ReadOnlySpan<char>` for consistency with the handler path. `lang` intentionally stays `string` (it's never interpolated and the `??= "ENU"` fallback stays cleaner). - Adds `int charCount` overloads of the three `GetMaxMessage*Length` helpers so stackalloc sizing can avoid the redundant `ROS<char>` round-trip. - Moves `Mobile` (17 methods) and `Item` (4 methods) message methods into new partial-class files (`Mobile.Messages.cs`, `Item.Messages.cs`) for organization. No UOContent call sites change in this PR — existing `string`/`ROS<char>` calls compile unchanged via implicit conversion. Phase 2 (intermediate-string audit) and Phase 3 (cleanup PRs) follow. ## Files - `Projects/Server/Network/Packets/OutgoingMessagePackets.cs` — `string` → `ROS<char>` for text params, `int charCount` length helpers added, class made `partial` - `Projects/Server/Network/Packets/OutgoingMessagePackets.Interpolated.cs` (new) — 3 `ref RawInterpolatedStringHandler` extension overloads - `Projects/Server/Mobiles/Mobile.cs` — message methods extracted (-262 lines) - `Projects/Server/Mobiles/Mobile.Messages.cs` (new, 463 lines) — moved + ROS-converted methods + 25 handler overloads - `Projects/Server/Items/Item.cs` — message methods extracted (-93 lines) - `Projects/Server/Items/Item.Messages.cs` (new, 142 lines) — moved + ROS-converted methods + 4 handler overloads - `Projects/Server.Tests/Tests/Network/Packets/Outgoing/MessagePacketTests.cs` — 3 new regression tests verifying byte-equivalence for the handler overloads
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Kamron Batman
GitHub
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13 changed files with 904 additions and 409 deletions
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@ -29,11 +29,12 @@ public enum AffixType : byte
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System = 0x02
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}
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public static class OutgoingMessagePackets
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public static partial class OutgoingMessagePackets
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{
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public static void SendMessageLocalized(
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this NetState ns,
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Serial serial, int graphic, MessageType type, int hue, int font, int number, string name = "", string args = ""
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Serial serial, int graphic, MessageType type, int hue, int font, int number,
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ReadOnlySpan<char> name = default, ReadOnlySpan<char> args = default
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)
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{
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if (ns.CannotSendPackets())
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@ -41,7 +42,7 @@ public static class OutgoingMessagePackets
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return;
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}
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var buffer = stackalloc byte[GetMaxMessageLocalizedLength(args)].InitializePacket();
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var buffer = stackalloc byte[GetMaxMessageLocalizedLength(args.Length)].InitializePacket();
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var length = CreateMessageLocalized(
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buffer, serial, graphic, type, hue, font, number, name, args
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);
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@ -50,11 +51,16 @@ public static class OutgoingMessagePackets
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}
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[MethodImpl(MethodImplOptions.AggressiveInlining)]
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public static int GetMaxMessageLocalizedLength(string args) => 50 + (args?.Length ?? 0) * 2;
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public static int GetMaxMessageLocalizedLength(int argsCharCount) => 50 + argsCharCount * 2;
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[MethodImpl(MethodImplOptions.AggressiveInlining)]
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public static int GetMaxMessageLocalizedLength(ReadOnlySpan<char> args) =>
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GetMaxMessageLocalizedLength(args.Length);
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public static int CreateMessageLocalized(
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Span<byte> buffer,
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Serial serial, int graphic, MessageType type, int hue, int font, int number, string name = "", string args = ""
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Serial serial, int graphic, MessageType type, int hue, int font, int number,
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ReadOnlySpan<char> name = default, ReadOnlySpan<char> args = default
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)
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{
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if (buffer[0] != 0)
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@ -62,9 +68,6 @@ public static class OutgoingMessagePackets
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return buffer.Length;
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}
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name ??= "";
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args ??= "";
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if (hue == 0)
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{
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hue = 0x3B2;
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@ -88,8 +91,9 @@ public static class OutgoingMessagePackets
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public static void SendMessageLocalizedAffix(
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this NetState ns,
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Serial serial, int graphic, MessageType type, int hue, int font, int number, string name,
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AffixType affixType, string affix = "", string args = ""
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Serial serial, int graphic, MessageType type, int hue, int font, int number,
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ReadOnlySpan<char> name, AffixType affixType,
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ReadOnlySpan<char> affix = default, ReadOnlySpan<char> args = default
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)
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{
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if (ns.CannotSendPackets())
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@ -97,7 +101,7 @@ public static class OutgoingMessagePackets
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return;
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}
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var buffer = stackalloc byte[GetMaxMessageLocalizedAffixLength(affix, args)].InitializePacket();
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var buffer = stackalloc byte[GetMaxMessageLocalizedAffixLength(affix.Length, args.Length)].InitializePacket();
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var length = CreateMessageLocalizedAffix(
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buffer, serial, graphic, type, hue, font, number, name, affixType, affix, args
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);
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@ -106,13 +110,18 @@ public static class OutgoingMessagePackets
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}
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[MethodImpl(MethodImplOptions.AggressiveInlining)]
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public static int GetMaxMessageLocalizedAffixLength(string affix, string args) =>
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52 + (affix?.Length ?? 0) + (args?.Length ?? 0) * 2;
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public static int GetMaxMessageLocalizedAffixLength(int affixCharCount, int argsCharCount) =>
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52 + affixCharCount + argsCharCount * 2;
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[MethodImpl(MethodImplOptions.AggressiveInlining)]
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public static int GetMaxMessageLocalizedAffixLength(ReadOnlySpan<char> affix, ReadOnlySpan<char> args) =>
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GetMaxMessageLocalizedAffixLength(affix.Length, args.Length);
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public static int CreateMessageLocalizedAffix(
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Span<byte> buffer,
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Serial serial, int graphic, MessageType type, int hue, int font, int number, string name,
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AffixType affixType, string affix = "", string args = ""
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Serial serial, int graphic, MessageType type, int hue, int font, int number,
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ReadOnlySpan<char> name, AffixType affixType,
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ReadOnlySpan<char> affix = default, ReadOnlySpan<char> args = default
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)
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{
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if (buffer[0] != 0)
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@ -120,10 +129,6 @@ public static class OutgoingMessagePackets
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return buffer.Length;
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}
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name ??= "";
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affix ??= "";
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args ??= "";
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if (hue == 0)
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{
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hue = 0x3B2;
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@ -149,7 +154,8 @@ public static class OutgoingMessagePackets
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public static void SendMessage(
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this NetState ns,
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Serial serial, int graphic, MessageType type, int hue, int font, bool ascii, string lang, string name, string text
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Serial serial, int graphic, MessageType type, int hue, int font, bool ascii,
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string lang, ReadOnlySpan<char> name, ReadOnlySpan<char> text
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)
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{
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if (ns.CannotSendPackets())
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@ -157,7 +163,7 @@ public static class OutgoingMessagePackets
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return;
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}
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var buffer = stackalloc byte[GetMaxMessageLength(text)].InitializePacket();
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var buffer = stackalloc byte[GetMaxMessageLength(text.Length)].InitializePacket();
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var length = CreateMessage(
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buffer,
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serial,
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@ -175,7 +181,10 @@ public static class OutgoingMessagePackets
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}
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[MethodImpl(MethodImplOptions.AggressiveInlining)]
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public static int GetMaxMessageLength(string text) => 50 + (text?.Length ?? 0) * 2;
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public static int GetMaxMessageLength(int textCharCount) => 50 + textCharCount * 2;
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[MethodImpl(MethodImplOptions.AggressiveInlining)]
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public static int GetMaxMessageLength(ReadOnlySpan<char> text) => GetMaxMessageLength(text.Length);
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public static int CreateMessage(
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Span<byte> buffer,
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@ -186,8 +195,8 @@ public static class OutgoingMessagePackets
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int font,
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bool ascii,
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string lang,
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string name,
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string text
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ReadOnlySpan<char> name,
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ReadOnlySpan<char> text
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)
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{
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if (buffer[0] != 0)
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@ -195,8 +204,6 @@ public static class OutgoingMessagePackets
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return buffer.Length;
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}
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name ??= "";
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text ??= "";
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lang ??= "ENU";
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if (hue == 0)
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