content: /*
   * Copyright 2024-2025 the original author or authors.
   *
   * Licensed under the Apache License, Version 2.0 (the "License");
   * you may not use this file except in compliance with the License.
   * You may obtain a copy of the License at
   *
   *      https://www.apache.org/licenses/LICENSE-2.0
   *
   * Unless required by applicable law or agreed to in writing, software
   * distributed under the License is distributed on an "AS IS" BASIS,
   * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
   * See the License for the specific language governing permissions and
   * limitations under the License.
   */
  package com.alibaba.cloud.ai.tracing;
  
  import io.micrometer.tracing.Tracer;
  import jakarta.servlet.http.HttpServletRequest;
  import jakarta.servlet.http.HttpServletResponse;
  import org.springframework.stereotype.Component;
  import org.springframework.web.servlet.HandlerInterceptor;
  
  import java.util.Objects;
  
  @Component
  public class TraceIdInterceptor implements HandlerInterceptor {
  
  	private final Tracer tracer;
  
  	public TraceIdInterceptor(Tracer tracer) {
  		this.tracer = tracer;
  	}
  
  	@Override
  	public boolean preHandle(HttpServletRequest request, HttpServletResponse response, Object handler)
  			throws Exception {
  		if (tracer.currentSpan() != null) {
  			String traceId = Objects.requireNonNull(tracer.currentSpan()).context().traceId();
  			response.setHeader("X-Request-ID", traceId);
  		}
  		return true;
  	}
  
  }
  