content: /*
   * Copyright The OpenTelemetry Authors
   * SPDX-License-Identifier: Apache-2.0
   */
  
  package io.opentelemetry.javaagent.instrumentation.hystrix;
  
  import static io.opentelemetry.api.common.AttributeKey.booleanKey;
  import static io.opentelemetry.api.common.AttributeKey.stringKey;
  
  import io.opentelemetry.api.common.AttributeKey;
  import io.opentelemetry.api.common.AttributesBuilder;
  import io.opentelemetry.context.Context;
  import io.opentelemetry.instrumentation.api.instrumenter.AttributesExtractor;
  import javax.annotation.Nullable;
  
  final class ExperimentalAttributesExtractor implements AttributesExtractor<HystrixRequest, Void> {
    private static final AttributeKey<String> HYSTRIX_COMMAND = stringKey("hystrix.command");
    private static final AttributeKey<String> HYSTRIX_GROUP = stringKey("hystrix.group");
    private static final AttributeKey<Boolean> HYSTRIX_CIRCUIT_OPEN =
        booleanKey("hystrix.circuit_open");
  
    @Override
    public void onStart(
        AttributesBuilder attributes, Context parentContext, HystrixRequest hystrixRequest) {
      String commandName = hystrixRequest.command().getCommandKey().name();
      String groupName = hystrixRequest.command().getCommandGroup().name();
      boolean circuitOpen = hystrixRequest.command().isCircuitBreakerOpen();
  
      attributes.put(HYSTRIX_COMMAND, commandName);
      attributes.put(HYSTRIX_GROUP, groupName);
      attributes.put(HYSTRIX_CIRCUIT_OPEN, circuitOpen);
    }
  
    @Override
    public void onEnd(
        AttributesBuilder attributes,
        Context context,
        HystrixRequest hystrixRequest,
        @Nullable Void unused,
        @Nullable Throwable error) {}
  }
  