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SignalR Server

Server-side SignalR hub infrastructure: method dispatch, session management, broadcast, and diagnostics. Source: SignalRs/ in this project.

For client-side transport (tags, wire protocol, client base) see AyCode.Services/docs/SIGNALR/README.md. For the DataSource collection see ../SIGNALR_DATASOURCE/README.md.

Server Processing

6. OnReceiveMessage(tag, requestId, signalParams, object data)
7. Extract parameterBytes from signalParams.Parameters
8. DynamicMethodRegistry.GetMethodByMessageTag(tag)      <- ConcurrentDictionary lookup
9. signalParams.GetParameterValues(paramInfos):
   |- byte[] -> BinaryTo<byte[][]>() (cached)
   |- Per-element: byte[][i].BinaryTo(paramInfos[i].ParameterType)
   |- Trailing defaults auto-filled
   |- Hub validates: missing required params throw ArgumentException
   '- NOTE: BinaryTo only -- JSON param deserialization not supported (needs JsonTo + project ref)
10. MethodInfo.InvokeMethod(instance, params)              <- unwraps Task/ValueTask
11. ResponseToCaller(tag, Success, responseData, requestId, signalParams):
12. SendMessageToClient(caller, tag, status, responseData, requestId, clientSignalParams):
    |- Build response SignalParams { Status, DataSerializerType, SignalDataType, IsRawBytesData }
    |- SignalDataType = responseData?.GetType().AssemblyQualifiedName (null if IsRawBytesData)
    |- IsRawBytesData forwarded from client's SignalParams
    '- caller.OnReceiveMessage(tag, requestId, signalParams, responseData)
        Protocol zero-copy serializes responseData directly to pipe (no intermediate byte[])
13. If SendToOtherClientType != None:
    '- SendMessageToOthers(sendToOtherClientTag, result) <- uses sendToOtherClientTag, not messageTag

Dynamic Method Dispatch

See also: AyCode.Models.Server/DynamicMethods/README.md

Server-Side Lookup

1. OnReceiveMessage(tag=100, requestId, signalParams, object data)

2. DynamicMethodRegistry.GetMethodByMessageTag(100)
   |- Check static ConcurrentDictionary<int, (Type, AcMethodInfoModel)?> cache
   |- Hit? -> find instance of cached Type from registered instances
   |- Miss? -> scan all registered instances' methods for [SignalR(100)]
   |          cache the result (including negative = null)
   '- Return (instance, methodInfoModel) or null

3. AcMethodInfoModel contains:
   |- MethodInfo (the method to invoke)
   |- SignalRAttribute (tag, sendToOtherClientTag, sendToOtherClientType)
   '- ParamInfos[] (ParameterInfo for deserialization)

The DynamicMethodRegistry uses a static ConcurrentDictionary for the global tag->method cache.

Registration

The hub registers service instances during initialization:

DynamicMethodRegistry.Register(myService);    // scans [SignalR(tag)] methods lazily
DynamicMethodRegistry.Register(anotherService);

Reflection runs lazily per tag on first request, then results are cached statically.

Session Management

AcSessionService<TSessionItem, TSessionItemId> tracks connected clients:

ConcurrentDictionary<TSessionItemId, TSessionItem> Sessions

IAcSessionItem<TSessionItemId> requires SessionId property. Targets messages to specific users/connections.

Broadcast Service

AcSignalRSendToClientService<THub, TTags, TLogger> provides server-push methods:

Method	Target
`SendMessageToAllClients`	All connected
`SendMessageToConnection(connectionId)`	Single connection
`SendMessageToUser(userId)`	User (all connections)
`SendMessageToUsers(userIds)`	Multiple users

All messages use the same SendMessageToClient path: build SignalParams (Status, DataSerializerType, SignalDataType) + pass object responseData as separate hub argument. Protocol zero-copy serializes responseData directly to the pipe.

Hub Events

OnConnectedAsync() -- log connection
OnDisconnectedAsync(exception) -- log disconnection, cleanup session

Diagnostics

Enable with AcWebSignalRHubBase.EnableBinaryDiagnostics = true.

Logs: hex dump (500 byte sample), header parsing (version, marker), property count + names via VarUInt reading.

Key Source Files

Component	Path
Hub base	`SignalRs/AcWebSignalRHubBase.cs`
Session service	`SignalRs/AcSessionService.cs`
Broadcast service	`SignalRs/AcSignalRSendToClientService.cs`
Logger hub	`SignalRs/AcLoggerSignalRHub.cs`
Tracking helpers	`SignalRs/TrackingItemHelpers.cs`
Dynamic dispatch	`AyCode.Models.Server/DynamicMethods/AcDynamicMethodRegistry.cs`

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