content: /*
   * Copyright 2020-2023 the original author or authors.
   *
   * Licensed 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
   *
   *      https://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.jun.mqttx.broker.codec;
  
  import io.netty.buffer.ByteBuf;
  import io.netty.channel.ChannelHandlerContext;
  import io.netty.handler.codec.MessageToMessageCodec;
  import io.netty.handler.codec.http.websocketx.BinaryWebSocketFrame;
  
  import java.util.List;
  
  /**
   * websocket 编解码器，中转作用
   */
  public class MqttWebsocketCodec extends MessageToMessageCodec<BinaryWebSocketFrame, ByteBuf> {
  
      @Override
      protected void encode(ChannelHandlerContext channelHandlerContext, ByteBuf byteBuf, List<Object> list) {
          list.add(new BinaryWebSocketFrame(byteBuf.retain()));
      }
  
      @Override
      protected void decode(ChannelHandlerContext channelHandlerContext, BinaryWebSocketFrame binaryWebSocketFrame, List<Object> list) {
          list.add(binaryWebSocketFrame.retain().content());
      }
  }
  