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.compileflow.engine.core.observability.tracing;
  
  import com.alibaba.compileflow.engine.core.extension.Extension;
  import com.alibaba.compileflow.engine.core.extension.ExtensionContext;
  import com.alibaba.compileflow.engine.core.extension.ExtensionPoint;
  
  /**
   * Distributed tracing provider extension point.
   * <p>
   * Supports any company's tracing middleware: Sleuth, Micrometer,
   * Eagle Eye, CAT, SkyWalking, etc.
   *
   * @author yusu
   */
  public interface TracingProvider extends Extension<TracingProvider.TracingExtensionContext> {
  
      String EXT_GET_TRACE_ID = "compileflow.tracing.getTraceId";
  
      /**
       * Gets the current distributed trace ID.
       * <p>
       * Retrieves from thread context: MDC, ThreadLocal, TraceContext, etc.
       * No parameters needed as tracing systems get from current thread.
       */
      @ExtensionPoint(code = EXT_GET_TRACE_ID, desc = "Get distributed trace ID")
      String getTraceId();
  
      /**
       * Checks if current tracing environment is supported.
       * Complies with CompileFlow Extension mechanism.
       */
      @Override
      default boolean support(TracingExtensionContext context) {
          try {
              String traceId = getTraceId();
              return traceId != null && !"no-trace".equals(traceId);
          } catch (Exception e) {
              return false;
          }
      }
  
      class TracingExtensionContext implements ExtensionContext {
  
          public static final TracingExtensionContext INSTANCE = new TracingExtensionContext();
  
          private TracingExtensionContext() {
          }
  
          public static TracingExtensionContext getInstance() {
              return INSTANCE;
          }
      }
  
  }
  