content: /*
   * Copyright 1999-2018 Alibaba Group Holding Ltd.
   *
   * 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
   *
   *      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 com.alibaba.csp.sentinel.cluster.client.codec.netty;
  
  import java.util.List;
  
  import com.alibaba.csp.sentinel.cluster.client.codec.ClientEntityCodecProvider;
  import com.alibaba.csp.sentinel.cluster.client.codec.registry.ResponseDataDecodeRegistry;
  import com.alibaba.csp.sentinel.cluster.codec.EntityDecoder;
  import com.alibaba.csp.sentinel.cluster.codec.response.ResponseEntityDecoder;
  import com.alibaba.csp.sentinel.cluster.response.ClusterResponse;
  import com.alibaba.csp.sentinel.cluster.response.Response;
  import com.alibaba.csp.sentinel.log.RecordLog;
  
  import io.netty.buffer.ByteBuf;
  import io.netty.channel.ChannelHandlerContext;
  import io.netty.handler.codec.ByteToMessageDecoder;
  
  /**
   * @author Eric Zhao
   * @since 1.4.0
   */
  public class NettyResponseDecoder extends ByteToMessageDecoder {
  
      @Override
      protected void decode(ChannelHandlerContext ctx, ByteBuf in, List<Object> out) throws Exception {
          ResponseEntityDecoder<ByteBuf, Response> responseDecoder = ClientEntityCodecProvider.getResponseEntityDecoder();
          if (responseDecoder == null) {
              RecordLog.warn("[NettyResponseDecoder] Cannot resolve the global response entity decoder, "
                  + "dropping the response");
              return;
          }
  
          // TODO: handle decode error here.
          Response response = responseDecoder.decode(in);
          if (response != null) {
              out.add(response);
          }
      }
  }
  