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;
  
  import com.alibaba.csp.sentinel.cluster.client.codec.registry.RequestDataWriterRegistry;
  import com.alibaba.csp.sentinel.cluster.codec.EntityWriter;
  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;
  
  /**
   * @author Eric Zhao
   * @since 1.4.0
   */
  public class DefaultRequestEntityWriter implements RequestEntityWriter<ClusterRequest, ByteBuf> {
  
      @Override
      public void writeTo(ClusterRequest request, ByteBuf target) {
          int type = request.getType();
          EntityWriter<Object, ByteBuf> requestDataWriter = RequestDataWriterRegistry.getWriter(type);
  
          if (requestDataWriter == null) {
              RecordLog.warn("[DefaultRequestEntityWriter] Cannot find matching request writer for type <{}>,"
                  + " dropping the request", type);
              return;
          }
          // Write head part of request.
          writeHead(request, target);
          // Write data part.
          requestDataWriter.writeTo(request.getData(), target);
      }
  
      private void writeHead(Request request, ByteBuf out) {
          out.writeInt(request.getId());
          out.writeByte(request.getType());
      }
  }
  