content: package com.platform.rpc.remoting.net.impl.netty.codec;
  
  import com.platform.rpc.serialize.Serializer;
  import io.netty.buffer.ByteBuf;
  import io.netty.channel.ChannelHandlerContext;
  import io.netty.handler.codec.ByteToMessageDecoder;
  
  import java.util.List;
  
  /**
   * decoder
   */
  public class NettyDecoder extends ByteToMessageDecoder {
  
      private Class<?> genericClass;
      private Serializer serializer;
  
      public NettyDecoder(Class<?> genericClass, final Serializer serializer) {
          this.genericClass = genericClass;
          this.serializer = serializer;
      }
  
      @Override
      public final void decode(ChannelHandlerContext ctx, ByteBuf in, List<Object> out) throws Exception {
          if (in.readableBytes() < 4) {
              return;
          }
          in.markReaderIndex();
          int dataLength = in.readInt();
          if (dataLength < 0) {
              ctx.close();
          }
          if (in.readableBytes() < dataLength) {
              in.resetReaderIndex();
              return;	// fix 1024k buffer splice limix
          }
          byte[] data = new byte[dataLength];
          in.readBytes(data);
  
          Object obj = serializer.deserialize(data, genericClass);
          out.add(obj);
      }
  }
  