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| 1 | +@startuml Core Components |
| 2 | + |
| 3 | +' Core Interfaces |
| 4 | +interface McpTransport { |
| 5 | + +Mono<Void> connect(Function<Mono<JSONRPCMessage>, Mono<JSONRPCMessage>> handler) |
| 6 | + +Mono<Void> sendMessage(JSONRPCMessage message) |
| 7 | + +void close() |
| 8 | + +Mono<Void> closeGracefully() |
| 9 | + +<T> T unmarshalFrom(Object data, TypeReference<T> typeRef) |
| 10 | +} |
| 11 | + |
| 12 | +interface McpSession { |
| 13 | + +<T> Mono<T> sendRequest(String method, Object requestParams, TypeReference<T> typeRef) |
| 14 | + +Mono<Void> sendNotification(String method, Map<String, Object> params) |
| 15 | + +Mono<Void> closeGracefully() |
| 16 | + +void close() |
| 17 | +} |
| 18 | + |
| 19 | +' Core Implementation Classes |
| 20 | +class DefaultMcpSession { |
| 21 | + +interface RequestHandler |
| 22 | + +interface NotificationHandler |
| 23 | +} |
| 24 | + |
| 25 | +' Client Classes |
| 26 | +class McpClient { |
| 27 | + +{static} Builder using(ClientMcpTransport transport) |
| 28 | +} |
| 29 | + |
| 30 | +class McpAsyncClient { |
| 31 | + +Mono<InitializeResult> initialize() |
| 32 | + +ServerCapabilities getServerCapabilities() |
| 33 | + +Implementation getServerInfo() |
| 34 | + +ClientCapabilities getClientCapabilities() |
| 35 | + +Implementation getClientInfo() |
| 36 | + +void close() |
| 37 | + +Mono<Void> closeGracefully() |
| 38 | + +Mono<Object> ping() |
| 39 | + +Mono<Void> addRoot(Root root) |
| 40 | + +Mono<Void> removeRoot(String rootUri) |
| 41 | + +Mono<Void> rootsListChangedNotification() |
| 42 | + +Mono<CallToolResult> callTool(CallToolRequest request) |
| 43 | + +Mono<ListToolsResult> listTools() |
| 44 | + +Mono<ListResourcesResult> listResources() |
| 45 | + +Mono<ReadResourceResult> readResource(ReadResourceRequest request) |
| 46 | + +Mono<ListResourceTemplatesResult> listResourceTemplates() |
| 47 | + +Mono<Void> subscribeResource(SubscribeRequest request) |
| 48 | + +Mono<Void> unsubscribeResource(UnsubscribeRequest request) |
| 49 | + +Mono<ListPromptsResult> listPrompts() |
| 50 | + +Mono<GetPromptResult> getPrompt(GetPromptRequest request) |
| 51 | + +Mono<Void> setLoggingLevel(LoggingLevel level) |
| 52 | +} |
| 53 | + |
| 54 | +class McpSyncClient { |
| 55 | + +InitializeResult initialize() |
| 56 | + +ServerCapabilities getServerCapabilities() |
| 57 | + +Implementation getServerInfo() |
| 58 | + +ClientCapabilities getClientCapabilities() |
| 59 | + +Implementation getClientInfo() |
| 60 | + +void close() |
| 61 | + +boolean closeGracefully() |
| 62 | + +Object ping() |
| 63 | + +void addRoot(Root root) |
| 64 | + +void removeRoot(String rootUri) |
| 65 | + +void rootsListChangedNotification() |
| 66 | + +CallToolResult callTool(CallToolRequest request) |
| 67 | + +ListToolsResult listTools() |
| 68 | + +ListResourcesResult listResources() |
| 69 | + +ReadResourceResult readResource(ReadResourceRequest request) |
| 70 | + +ListResourceTemplatesResult listResourceTemplates() |
| 71 | + +void subscribeResource(SubscribeRequest request) |
| 72 | + +void unsubscribeResource(UnsubscribeRequest request) |
| 73 | + +ListPromptsResult listPrompts() |
| 74 | + +GetPromptResult getPrompt(GetPromptRequest request) |
| 75 | + +void setLoggingLevel(LoggingLevel level) |
| 76 | +} |
| 77 | + |
| 78 | +' Server Classes |
| 79 | +class McpServer { |
| 80 | + +{static} Builder using(ServerMcpTransport transport) |
| 81 | +} |
| 82 | + |
| 83 | +class McpAsyncServer { |
| 84 | + |
| 85 | + +ServerCapabilities getServerCapabilities() |
| 86 | + +Implementation getServerInfo() |
| 87 | + +ClientCapabilities getClientCapabilities() |
| 88 | + +Implementation getClientInfo() |
| 89 | + +void close() |
| 90 | + +Mono<Void> closeGracefully() |
| 91 | + |
| 92 | + ' Tool Management |
| 93 | + +Mono<Void> addTool(ToolRegistration toolRegistration) |
| 94 | + +Mono<Void> removeTool(String toolName) |
| 95 | + +Mono<Void> notifyToolsListChanged() |
| 96 | + |
| 97 | + ' Resource Management |
| 98 | + +Mono<Void> addResource(ResourceRegistration resourceHandler) |
| 99 | + +Mono<Void> removeResource(String resourceUri) |
| 100 | + +Mono<Void> notifyResourcesListChanged() |
| 101 | + |
| 102 | + ' Prompt Management |
| 103 | + +Mono<Void> addPrompt(PromptRegistration promptRegistration) |
| 104 | + +Mono<Void> removePrompt(String promptName) |
| 105 | + +Mono<Void> notifyPromptsListChanged() |
| 106 | + |
| 107 | + ' Logging |
| 108 | + +Mono<Void> loggingNotification(LoggingMessageNotification notification) |
| 109 | + |
| 110 | + ' Sampling |
| 111 | + +Mono<CreateMessageResult> createMessage(CreateMessageRequest request) |
| 112 | +} |
| 113 | + |
| 114 | +class McpSyncServer { |
| 115 | + +McpAsyncServer getAsyncServer() |
| 116 | + |
| 117 | + +ServerCapabilities getServerCapabilities() |
| 118 | + +Implementation getServerInfo() |
| 119 | + +ClientCapabilities getClientCapabilities() |
| 120 | + +Implementation getClientInfo() |
| 121 | + +void close() |
| 122 | + +void closeGracefully() |
| 123 | + |
| 124 | + ' Tool Management |
| 125 | + +void addTool(ToolRegistration toolHandler) |
| 126 | + +void removeTool(String toolName) |
| 127 | + +void notifyToolsListChanged() |
| 128 | + |
| 129 | + ' Resource Management |
| 130 | + +void addResource(ResourceRegistration resourceHandler) |
| 131 | + +void removeResource(String resourceUri) |
| 132 | + +void notifyResourcesListChanged() |
| 133 | + |
| 134 | + ' Prompt Management |
| 135 | + +void addPrompt(PromptRegistration promptRegistration) |
| 136 | + +void removePrompt(String promptName) |
| 137 | + +void notifyPromptsListChanged() |
| 138 | + |
| 139 | + ' Logging |
| 140 | + +void loggingNotification(LoggingMessageNotification notification) |
| 141 | + |
| 142 | + ' Sampling |
| 143 | + +CreateMessageResult createMessage(CreateMessageRequest request) |
| 144 | +} |
| 145 | + |
| 146 | +' Transport Implementations |
| 147 | +class StdioClientTransport implements ClientMcpTransport { |
| 148 | + +void setErrorHandler(Consumer<String> errorHandler) |
| 149 | + +Sinks.Many<String> getErrorSink() |
| 150 | +} |
| 151 | + |
| 152 | +class StdioServerTransport implements ServerMcpTransport { |
| 153 | +} |
| 154 | + |
| 155 | + |
| 156 | +class HttpServletSseServerTransport implements ServerMcpTransport { |
| 157 | +} |
| 158 | + |
| 159 | + |
| 160 | +class HttpClientSseClientTransport implements ClientMcpTransport { |
| 161 | +} |
| 162 | + |
| 163 | + |
| 164 | +class WebFluxSseClientTransport implements ClientMcpTransport { |
| 165 | +} |
| 166 | + |
| 167 | + |
| 168 | +class WebFluxSseServerTransport implements ServerMcpTransport { |
| 169 | + +RouterFunction<?> getRouterFunction() |
| 170 | +} |
| 171 | + |
| 172 | +class WebMvcSseServerTransport implements ServerMcpTransport { |
| 173 | + +RouterFunction<?> getRouterFunction() |
| 174 | +} |
| 175 | + |
| 176 | + |
| 177 | +' Schema and Error Classes |
| 178 | +class McpSchema { |
| 179 | + +class ErrorCodes |
| 180 | + +interface Request |
| 181 | + +interface JSONRPCMessage |
| 182 | + +interface ResourceContents |
| 183 | + +interface Content |
| 184 | + +interface ServerCapabilities |
| 185 | + +{static} JSONRPCMessage deserializeJsonRpcMessage() |
| 186 | +} |
| 187 | + |
| 188 | +class McpError { |
| 189 | +} |
| 190 | + |
| 191 | +' Relationships |
| 192 | +McpTransport <|.. ClientMcpTransport |
| 193 | +McpTransport <|.. ServerMcpTransport |
| 194 | + |
| 195 | +McpSession <|.. DefaultMcpSession |
| 196 | +DefaultMcpSession --o McpAsyncClient |
| 197 | +DefaultMcpSession --o McpAsyncServer |
| 198 | + |
| 199 | +McpClient ..> McpAsyncClient : creates |
| 200 | +McpClient ..> McpSyncClient : creates |
| 201 | +McpSyncClient --> McpAsyncClient : delegates to |
| 202 | + |
| 203 | +McpServer ..> McpAsyncServer : creates |
| 204 | +McpServer ..> McpSyncServer : creates |
| 205 | +McpSyncServer o-- McpAsyncServer |
| 206 | + |
| 207 | +DefaultMcpSession o-- McpTransport |
| 208 | +McpSchema <.. McpSession : uses |
| 209 | +McpError ..> McpSession : throws |
| 210 | + |
| 211 | +@enduml |
| 212 | + |
| 213 | +@startuml Message Flow |
| 214 | + |
| 215 | +package "MCP Schema" { |
| 216 | + interface JSONRPCMessage { |
| 217 | + +String jsonrpc() |
| 218 | + } |
| 219 | + |
| 220 | + interface Request { |
| 221 | + } |
| 222 | + |
| 223 | + class InitializeRequest |
| 224 | + class CallToolRequest |
| 225 | + class ListToolsRequest |
| 226 | + class ListResourcesRequest |
| 227 | + class ReadResourceRequest |
| 228 | + class ListResourceTemplatesRequest |
| 229 | + class ListPromptsRequest |
| 230 | + class GetPromptRequest |
| 231 | +} |
| 232 | + |
| 233 | +package "Resource Types" { |
| 234 | + interface ResourceContents { |
| 235 | + +String uri() |
| 236 | + +String mimeType() |
| 237 | + } |
| 238 | + |
| 239 | + class TextResourceContents |
| 240 | + class BlobResourceContents |
| 241 | + |
| 242 | + interface Content { |
| 243 | + +String type() |
| 244 | + } |
| 245 | + |
| 246 | + class TextContent |
| 247 | + class ImageContent |
| 248 | + class EmbeddedResource |
| 249 | + |
| 250 | + interface Annotated { |
| 251 | + +Annotations annotations() |
| 252 | + } |
| 253 | + |
| 254 | + interface PromptOrResourceReference { |
| 255 | + +String type() |
| 256 | + } |
| 257 | + |
| 258 | + class PromptReference |
| 259 | + class ResourceReference |
| 260 | +} |
| 261 | + |
| 262 | +JSONRPCMessage <|.. Request |
| 263 | +Request <|.. InitializeRequest |
| 264 | +Request <|.. CallToolRequest |
| 265 | +Request <|.. ListToolsRequest |
| 266 | +Request <|.. ListResourcesRequest |
| 267 | +Request <|.. ReadResourceRequest |
| 268 | +Request <|.. ListResourceTemplatesRequest |
| 269 | +Request <|.. ListPromptsRequest |
| 270 | +Request <|.. GetPromptRequest |
| 271 | + |
| 272 | +ResourceContents <|.. TextResourceContents |
| 273 | +ResourceContents <|.. BlobResourceContents |
| 274 | + |
| 275 | +Content <|.. TextContent |
| 276 | +Content <|.. ImageContent |
| 277 | +Content <|.. EmbeddedResource |
| 278 | + |
| 279 | +PromptOrResourceReference <|.. PromptReference |
| 280 | +PromptOrResourceReference <|.. ResourceReference |
| 281 | + |
| 282 | +@enduml |
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