content: /*
   *
   * Licensed to the Apache Software Foundation (ASF) under one or more
   * contributor license agreements.  See the NOTICE file distributed with
   * this work for additional information regarding copyright ownership.
   * The ASF licenses this file to You 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
   *
   *     http://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.cloudapp.observabilities.opentelemetry.trace;
  
  import com.alibaba.cloudapp.api.common.ComponentLifeCycle;
  import com.alibaba.cloudapp.api.observabilities.TraceService;
  import com.alibaba.cloudapp.observabilities.opentelemetry.util.OpenTelemetryTagTool;
  import io.opentelemetry.api.baggage.BaggageBuilder;
  import io.opentelemetry.context.Scope;
  import org.slf4j.Logger;
  import org.slf4j.LoggerFactory;
  
  import java.util.Map;
  
  public class OpenTelemetryTraceService implements TraceService,
          ComponentLifeCycle {
      
      private static final Logger logger = LoggerFactory.getLogger(
              OpenTelemetryTraceService.class);
      
      @Override
      public Map<String, String> getBaggageUserData() {
          return OpenTelemetryTagTool.baggageItems();
      }
      
      @Override
      public String getBaggageUserDataValue(String key) {
          Map<String, String> baggageItems = OpenTelemetryTagTool.baggageItems();
          
          if (baggageItems.containsKey(key)) {
              return baggageItems.get(key);
          }
          
          if (logger.isDebugEnabled()) {
              logger.debug("The baggage item with key {} is not found in the current " +
                              "span", key);
          }
          
          return null;
      }
      
      @Override
      public Scope withBaggageUserData(Map<String, String> pairs) {
          BaggageBuilder builder = OpenTelemetryTagTool.putBaggageItems(pairs);
          return OpenTelemetryTagTool.buildBaggageScope(builder);
      }
      
      @Override
      public void postStart() {
          logger.info("Enabled OpenTelemetry Trace Service.");
      }
      
      @Override
      public void preStop() {
          logger.info("Stopping OpenTelemetry Trace Service.");
      }
  }
  