[FEL] add logging/setLevel method in MCP server

framework/fel/java/plugins/tool-mcp-server/src/main/java/modelengine/fel/tool/mcp/server/McpServerController.java

@@ -16,6 +16,7 @@
 import modelengine.fel.tool.mcp.server.handler.PingHandler;
 import modelengine.fel.tool.mcp.server.handler.ToolCallHandler;
 import modelengine.fel.tool.mcp.server.handler.ToolListHandler;
+import modelengine.fel.tool.mcp.server.handler.LoggingSetLevelHandler;
 import modelengine.fel.tool.mcp.server.handler.UnsupportedMethodHandler;
 import modelengine.fit.http.annotation.GetMapping;
 import modelengine.fit.http.annotation.PostMapping;
@@ -77,6 +78,7 @@ public McpServerController(@Fit(alias = "json") ObjectSerializer serializer, Mcp
         this.methodHandlers.put(Method.PING.code(), new PingHandler());
         this.methodHandlers.put(Method.TOOLS_LIST.code(), new ToolListHandler(mcpServer));
         this.methodHandlers.put(Method.TOOLS_CALL.code(), new ToolCallHandler(mcpServer, this.serializer));
+        this.methodHandlers.put(Method.LOGGING_SET_LEVEL.code(), new LoggingSetLevelHandler());
 
         ThreadPoolScheduler channelDetectorScheduler = ThreadPoolScheduler.custom()
                 .corePoolSize(1)

framework/fel/java/plugins/tool-mcp-server/src/main/java/modelengine/fel/tool/mcp/server/handler/LoggingSetLevelHandler.java

@@ -0,0 +1,75 @@
+/*---------------------------------------------------------------------------------------------
+ *  Copyright (c) 2025 Huawei Technologies Co., Ltd. All rights reserved.
+ *  This file is a part of the ModelEngine Project.
+ *  Licensed under the MIT License. See License.txt in the project root for license information.
+ *--------------------------------------------------------------------------------------------*/
+
+package modelengine.fel.tool.mcp.server.handler;
+
+import modelengine.fel.tool.mcp.entity.LoggingLevel;
+import modelengine.fel.tool.mcp.server.MessageRequest;
+import modelengine.fitframework.util.StringUtils;
+
+import java.util.Collections;
+import java.util.Map;
+
+/**
+ *  A handler for processing logging set level requests in the MCP server.
+ *  This class extends {@link AbstractMessageHandler} and is responsible for handling
+ *  {@link LoggingSetLevelRequest} messages.
+ *
+ * @author 黄可欣
+ * @since 2025-09-10
+ */
+public class LoggingSetLevelHandler extends AbstractMessageHandler<LoggingSetLevelHandler.LoggingSetLevelRequest> {
+    private static final Map<Object, Object> SET_LEVEL_RESULT = Collections.emptyMap();
+
+    /**
+     * Constructs a new instance of the LoggingSetLevelHandler class.
+     */
+    public LoggingSetLevelHandler() {
+        super(LoggingSetLevelHandler.LoggingSetLevelRequest.class);
+    }
+
+    @Override
+    public Object handle(LoggingSetLevelHandler.LoggingSetLevelRequest request) {
+        if (request == null) {
+            throw new IllegalStateException("No logging set level request.");
+        }
+        if (StringUtils.isBlank(request.getLevel())) {
+            throw new IllegalStateException("No logging level in request.");
+        }
+        String loggingLevelString =  request.getLevel();
+        LoggingLevel loggingLevel = LoggingLevel.fromCode(loggingLevelString);
+        // TODO change the logging level of corresponding session.
+        return SET_LEVEL_RESULT;
+    }
+
+    /**
+     * Represents a request to set the logging level in the MCP server.
+     * This request is handled by {@link LoggingSetLevelHandler} to set the logging level in the MCP server.
+     *
+     * @since 2025-09-10
+     */
+    public static class LoggingSetLevelRequest extends MessageRequest {
+        private String level;
+
+        /**
+         * Gets the level of server logging.
+         *
+         * @return The level of server logging as a {@link String}.
+         */
+        public String getLevel() {
+            return this.level;
+        }
+
+        /**
+         * Sets the level of server logging .
+         *
+         * @param level The level of server logging as a {@link String}.
+         */
+        public void setLevel(String level) {
+            this.level = level;
+        }
+    }
+}

framework/fel/java/services/tool-mcp-common/src/main/java/modelengine/fel/tool/mcp/entity/LoggingLevel.java

@@ -0,0 +1,113 @@
+/*---------------------------------------------------------------------------------------------
+ *  Copyright (c) 2025 Huawei Technologies Co., Ltd. All rights reserved.
+ *  This file is a part of the ModelEngine Project.
+ *  Licensed under the MIT License. See License.txt in the project root for license information.
+ *--------------------------------------------------------------------------------------------*/
+
+package modelengine.fel.tool.mcp.entity;
+
+import modelengine.fitframework.inspection.Nonnull;
+
+/**
+ * Represents different logging level in MCP server, following the RFC-5424 severity scale.
+ *
+ * @author 黄可欣
+ * @see <a href="https://datatracker.ietf.org/doc/html/rfc5424#section-6.2.1">RFC 5424</a>
+ * @since 2025-09-10
+ */
+public enum LoggingLevel {
+    /**
+     * Detailed debugging information (function entry/exit points).
+     */
+    DEBUG(0, "debug"),
+
+    /**
+     * General informational messages (operation progress updates).
+     */
+    INFO(1, "info"),
+
+    /**
+     * Normal but significant events (configuration changes).
+     */
+    NOTICE(2, "notice"),
+
+    /**
+     * Warning conditions (deprecated feature usage).
+     */
+    WARNING(3, "warning"),
+
+    /**
+     * Error conditions (operation failures).
+     */
+    ERROR(4, "error"),
+
+    /**
+     * Critical conditions (system component failures).
+     */
+    CRITICAL(5, "critical"),
+
+    /**
+     * Action must be taken immediately (data corruption detected).
+     */
+    ALERT(6, "alert"),
+
+    /**
+     * System is unusable (complete system failure).
+     */
+    EMERGENCY(7, "emergency");
+
+    private final int level;
+    private final String code;
+
+    LoggingLevel(int level, String code) {
+        this.level = level;
+        this.code = code;
+    }
+
+    /**
+     * Returns the level number associated with the logging level.
+     *
+     * @return The number of the logging level as an {@code int}.
+     */
+    public int level() {
+        return this.level;
+    }
+
+    /**
+     * Returns the code associated with the logging level.
+     *
+     * @return The code of the logging level as a {@link String}.
+     */
+    public String code() {
+        return this.code;
+    }
+
+    /**
+     * Returns the default logging level which is INFO level.
+     *
+     * @return The default INFO logging level as a {@link LoggingLevel}.
+     */
+    public static LoggingLevel getDefault() {
+        return LoggingLevel.INFO;
+    }
+
+    /**
+     * Return the corresponding {@link LoggingLevel} from the logging level code.
+     * If there is no corresponding logging level, return the default logging level.
+     *
+     * @param code The code of logging level as a {@link String}.
+     * @return The corresponding or default logging level as a {@link LoggingLevel}.
+     */
+    @Nonnull
+    public static LoggingLevel fromCode(String code) {
+        if (code == null) {
+            return LoggingLevel.getDefault();
+        }
+        for (LoggingLevel level : values()) {
+            if (level.code.equalsIgnoreCase(code)) {
+                return level;
+            }
+        }
+        return LoggingLevel.getDefault();
+    }
+}

framework/fel/java/services/tool-mcp-common/src/main/java/modelengine/fel/tool/mcp/entity/Method.java

@@ -40,7 +40,13 @@ public enum Method {
     /**
      * Represents the notification method indicating a change in the list of tools.
      */
-    NOTIFICATION_TOOLS_CHANGED("notifications/tools/list_changed");
+    NOTIFICATION_TOOLS_CHANGED("notifications/tools/list_changed"),
+
+    /**
+     * Represents the method to set logging level.
+     * TODO The naming need to be standardized as snake_case.
+     */
+    LOGGING_SET_LEVEL("logging/setLevel");
 
     private final String code;