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.http;
  
  import static java.util.logging.Level.WARNING;
  
  import java.io.Closeable;
  import java.util.function.Consumer;
  import java.util.logging.Logger;
  
  public interface WebSocket extends Closeable {
    Logger LOG = Logger.getLogger(WebSocket.class.getName());
  
    WebSocket send(Message message);
  
    default WebSocket sendText(CharSequence data) {
      return send(new TextMessage(data));
    }
  
    default WebSocket sendBinary(byte[] data) {
      return send(new BinaryMessage(data));
    }
  
    @Override
    void close();
  
    interface Listener extends Consumer<Message> {
  
      default void accept(Message message) {
        if (message instanceof BinaryMessage) {
          onBinary(((BinaryMessage) message).data());
        } else if (message instanceof CloseMessage) {
          onClose(((CloseMessage) message).code(), ((CloseMessage) message).reason());
        } else if (message instanceof TextMessage) {
          onText(((TextMessage) message).text());
        }
      }
  
      default void onBinary(byte[] data) {
        // Does nothing
      }
  
      default void onClose(int code, String reason) {
        // Does nothing
      }
  
      default void onText(CharSequence data) {
        // Does nothing
      }
  
      default void onError(Throwable cause) {
        LOG.log(WARNING, cause.getMessage(), cause);
      }
    }
  }
  