code: // Licensed to the Software Freedom Conservancy (SFC) under one
  // or more contributor license agreements.  See the NOTICE file
  // distributed with this work for additional information
  // regarding copyright ownership.  The SFC 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 org.openqa.selenium.remote.tracing.opentelemetry;
  
  import com.google.common.annotations.VisibleForTesting;
  import io.opentelemetry.api.trace.Span;
  import io.opentelemetry.api.trace.SpanContext;
  import io.opentelemetry.api.trace.Tracer;
  import io.opentelemetry.context.Context;
  import io.opentelemetry.context.Scope;
  import java.util.Objects;
  import java.util.concurrent.Callable;
  import org.openqa.selenium.internal.Require;
  import org.openqa.selenium.remote.tracing.TraceContext;
  
  public class OpenTelemetryContext implements TraceContext {
    private final Tracer tracer;
    private final Context context;
    private final SpanContext spanContext;
  
    public OpenTelemetryContext(Tracer tracer, Context context) {
      this.tracer = Require.nonNull("Tracer", tracer);
      this.context = Require.nonNull("Context", context);
  
      spanContext = Span.fromContext(context).getSpanContext();
    }
  
    @Override
    public String getId() {
      return spanContext.getSpanId();
    }
  
    @SuppressWarnings("MustBeClosedChecker")
    @Override
    public OpenTelemetrySpan createSpan(String name) {
      Require.nonNull("Name", name);
  
      Span span = tracer.spanBuilder(name).setParent(context).startSpan();
      Context prev = Context.current();
  
      // Now update the context
      Scope scope = span.makeCurrent();
  
      if (prev.equals(Context.current())) {
        throw new IllegalStateException("Context has not been changed");
      }
  
      return new OpenTelemetrySpan(tracer, Context.current(), span, scope);
    }
  
    @VisibleForTesting
    Context getContext() {
      return context;
    }
  
    @Override
    public Runnable wrap(Runnable runnable) {
      return context.wrap(runnable);
    }
  
    @Override
    public <V> Callable<V> wrap(Callable<V> callable) {
      return context.wrap(callable);
    }
  
    @Override
    public boolean equals(Object o) {
      if (!(o instanceof OpenTelemetryContext)) {
        return false;
      }
      OpenTelemetryContext that = (OpenTelemetryContext) o;
      return Objects.equals(this.context, that.context);
    }
  
    @Override
    public int hashCode() {
      return Objects.hash(context);
    }
  
    @Override
    public String toString() {
      return "OpenTelemetryContext{"
          + "tracer="
          + tracer
          + ", context="
          + this.context
          + ", span id="
          + spanContext.getSpanId()
          + ", trace id="
          + spanContext.getTraceId()
          + '}';
    }
  }
  