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 com.alibaba.csp.sentinel.cluster.client.codec.ClientEntityCodecProvider;
  import com.alibaba.csp.sentinel.cluster.codec.request.RequestEntityWriter;
  import com.alibaba.csp.sentinel.cluster.request.ClusterRequest;
  import com.alibaba.csp.sentinel.cluster.request.Request;
  import com.alibaba.csp.sentinel.log.RecordLog;
  
  import io.netty.buffer.ByteBuf;
  import io.netty.channel.ChannelHandlerContext;
  import io.netty.handler.codec.MessageToByteEncoder;
  
  /**
   * @author Eric Zhao
   * @since 1.4.0
   */
  public class NettyRequestEncoder extends MessageToByteEncoder<ClusterRequest> {
  
      @Override
      protected void encode(ChannelHandlerContext ctx, ClusterRequest request, ByteBuf out) throws Exception {
          RequestEntityWriter<Request, ByteBuf> requestEntityWriter = ClientEntityCodecProvider.getRequestEntityWriter();
          if (requestEntityWriter == null) {
              RecordLog.warn("[NettyRequestEncoder] Cannot resolve the global request entity writer, dropping the request");
              return;
          }
  
          requestEntityWriter.writeTo(request, out);
      }
  }
  