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.observation.model;
  
  import io.micrometer.tracing.handler.TracingObservationHandler;
  import java.lang.reflect.InvocationTargetException;
  import java.lang.reflect.Method;
  import org.slf4j.Logger;
  import org.slf4j.LoggerFactory;
  import org.springframework.lang.Nullable;
  import io.opentelemetry.api.trace.Span;
  
  public final class OpenTelemetrySpanBridge {
  
  	private static final Logger logger = LoggerFactory.getLogger(OpenTelemetrySpanBridge.class);
  
  	private static Method toOtelMethod;
  
  	@Nullable
  	public static Span retrieveOtelSpan(@Nullable TracingObservationHandler.TracingContext tracingContext) {
  		if (tracingContext == null) {
  			return null;
  		}
  
  		io.micrometer.tracing.Span micrometerSpan = tracingContext.getSpan();
  		try {
  			if (toOtelMethod == null) {
  				Method method = tracingContext.getSpan()
  					.getClass()
  					.getDeclaredMethod("toOtel", io.micrometer.tracing.Span.class);
  				method.setAccessible(true);
  				toOtelMethod = method;
  			}
  
  			Object otelSpanObject = toOtelMethod.invoke(null, micrometerSpan);
  			if (otelSpanObject instanceof Span otelSpan) {
  				return otelSpan;
  			}
  		}
  		catch (NoSuchMethodException | InvocationTargetException | IllegalAccessException ex) {
  			logger.warn("Failed to retrieve the OpenTelemetry Span from Micrometer context", ex);
  			return null;
  		}
  
  		return null;
  	}
  
  }
  