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;
  
  import java.io.IOException;
  import java.util.Map;
  import java.util.Objects;
  import org.openqa.selenium.remote.tracing.Span;
  import org.openqa.selenium.remote.tracing.Tracer;
  
  public class TracedCommandExecutor implements CommandExecutor {
  
    private final CommandExecutor delegate;
    private final Tracer tracer;
  
    public TracedCommandExecutor(CommandExecutor delegate, Tracer tracer) {
      this.delegate = delegate;
      this.tracer = tracer;
    }
  
    @Override
    public Response execute(Command command) throws IOException {
      try (Span commandSpan = tracer.getCurrentContext().createSpan("command")) {
        SessionId sessionId = command.getSessionId();
        if (sessionId != null) {
          commandSpan.setAttribute("sessionId", sessionId.toString());
        }
        commandSpan.setAttribute("command", command.getName());
        Map<String, ?> parameters = command.getParameters();
        if (parameters != null && parameters.size() > 0) {
          for (Map.Entry<String, ?> parameter : parameters.entrySet()) {
            commandSpan.setAttribute(
                "parameter." + parameter.getKey(), Objects.toString(parameter.getValue(), "null"));
          }
        }
        return delegate.execute(command);
      }
    }
  }
  