001/*
002 * Copyright 2022-2026 Revetware LLC.
003 *
004 * Licensed under the Apache License, Version 2.0 (the "License");
005 * you may not use this file except in compliance with the License.
006 * You may obtain a copy of the License at
007 *
008 * http://www.apache.org/licenses/LICENSE-2.0
009 *
010 * Unless required by applicable law or agreed to in writing, software
011 * distributed under the License is distributed on an "AS IS" BASIS,
012 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
013 * See the License for the specific language governing permissions and
014 * limitations under the License.
015 */
016
017package com.soklet;
018
019import org.jspecify.annotations.NonNull;
020import org.jspecify.annotations.Nullable;
021
022import javax.annotation.concurrent.ThreadSafe;
023
024/**
025 * MCP-side analogue of HTTP {@link RequestInterceptor}.
026 *
027 * @author <a href="https://www.revetkn.com">Mark Allen</a>
028 */
029@ThreadSafe
030public interface McpRequestInterceptor {
031        /**
032         * Intercepts an MCP JSON-RPC request before Soklet dispatches it to framework or application logic.
033         *
034         * @param context the current request context
035         * @param invocation the invocation callback to continue processing
036         * @param <T> the invocation result type
037         * @return the invocation result
038         * @throws Exception if interception or downstream handling fails
039         */
040        @Nullable
041        default <T> T interceptRequest(@NonNull McpRequestContext context,
042                                                                                                                                 @NonNull McpHandlerInvocation<T> invocation) throws Exception {
043                return invocation.invoke();
044        }
045}