http://netty.io/netty-all/: Netty is an asynchronous event-driven network application framework for rapid development of maintainable high performance protocol servers and clients. (The Netty Project) 
public class io.netty.handler.codec.DatagramPacketDecoder extends io.netty.handler.codec.MessageToMessageDecoder<io.netty.channel.socket.DatagramPacket>
  minor version: 0
  major version: 59
  flags: flags: (0x0021) ACC_PUBLIC, ACC_SUPER
  this_class: io.netty.handler.codec.DatagramPacketDecoder
  super_class: io.netty.handler.codec.MessageToMessageDecoder
{
  private final io.netty.handler.codec.MessageToMessageDecoder<io.netty.buffer.ByteBuf> decoder;
    descriptor: Lio/netty/handler/codec/MessageToMessageDecoder;
    flags: (0x0012) ACC_PRIVATE, ACC_FINAL
    Signature: Lio/netty/handler/codec/MessageToMessageDecoder<Lio/netty/buffer/ByteBuf;>;

  public void <init>(io.netty.handler.codec.MessageToMessageDecoder<io.netty.buffer.ByteBuf>);
    descriptor: (Lio/netty/handler/codec/MessageToMessageDecoder;)V
    flags: (0x0001) ACC_PUBLIC
    Code:
      stack=3, locals=2, args_size=2
        start local 0 // io.netty.handler.codec.DatagramPacketDecoder this
        start local 1 // io.netty.handler.codec.MessageToMessageDecoder decoder
         0: .line 45
            aload 0 /* this */
            invokespecial io.netty.handler.codec.MessageToMessageDecoder.<init>:()V
         1: .line 46
            aload 0 /* this */
            aload 1 /* decoder */
            ldc "decoder"
            invokestatic io.netty.util.internal.ObjectUtil.checkNotNull:(Ljava/lang/Object;Ljava/lang/String;)Ljava/lang/Object;
            checkcast io.netty.handler.codec.MessageToMessageDecoder
            putfield io.netty.handler.codec.DatagramPacketDecoder.decoder:Lio/netty/handler/codec/MessageToMessageDecoder;
         2: .line 47
            return
        end local 1 // io.netty.handler.codec.MessageToMessageDecoder decoder
        end local 0 // io.netty.handler.codec.DatagramPacketDecoder this
      LocalVariableTable:
        Start  End  Slot     Name  Signature
            0    3     0     this  Lio/netty/handler/codec/DatagramPacketDecoder;
            0    3     1  decoder  Lio/netty/handler/codec/MessageToMessageDecoder<Lio/netty/buffer/ByteBuf;>;
    Signature: (Lio/netty/handler/codec/MessageToMessageDecoder<Lio/netty/buffer/ByteBuf;>;)V
    MethodParameters:
         Name  Flags
      decoder  

  public boolean acceptInboundMessage(java.lang.Object);
    descriptor: (Ljava/lang/Object;)Z
    flags: (0x0001) ACC_PUBLIC
    Code:
      stack=2, locals=2, args_size=2
        start local 0 // io.netty.handler.codec.DatagramPacketDecoder this
        start local 1 // java.lang.Object msg
         0: .line 51
            aload 1 /* msg */
            instanceof io.netty.channel.socket.DatagramPacket
            ifeq 2
         1: .line 52
            aload 0 /* this */
            getfield io.netty.handler.codec.DatagramPacketDecoder.decoder:Lio/netty/handler/codec/MessageToMessageDecoder;
            aload 1 /* msg */
            checkcast io.netty.channel.socket.DatagramPacket
            invokevirtual io.netty.channel.socket.DatagramPacket.content:()Ljava/lang/Object;
            invokevirtual io.netty.handler.codec.MessageToMessageDecoder.acceptInboundMessage:(Ljava/lang/Object;)Z
            ireturn
         2: .line 54
      StackMap locals:
      StackMap stack:
            iconst_0
            ireturn
        end local 1 // java.lang.Object msg
        end local 0 // io.netty.handler.codec.DatagramPacketDecoder this
      LocalVariableTable:
        Start  End  Slot  Name  Signature
            0    3     0  this  Lio/netty/handler/codec/DatagramPacketDecoder;
            0    3     1   msg  Ljava/lang/Object;
    Exceptions:
      throws java.lang.Exception
    MethodParameters:
      Name  Flags
      msg   

  protected void decode(io.netty.channel.ChannelHandlerContext, io.netty.channel.socket.DatagramPacket, java.util.List<java.lang.Object>);
    descriptor: (Lio/netty/channel/ChannelHandlerContext;Lio/netty/channel/socket/DatagramPacket;Ljava/util/List;)V
    flags: (0x0004) ACC_PROTECTED
    Code:
      stack=4, locals=4, args_size=4
        start local 0 // io.netty.handler.codec.DatagramPacketDecoder this
        start local 1 // io.netty.channel.ChannelHandlerContext ctx
        start local 2 // io.netty.channel.socket.DatagramPacket msg
        start local 3 // java.util.List out
         0: .line 59
            aload 0 /* this */
            getfield io.netty.handler.codec.DatagramPacketDecoder.decoder:Lio/netty/handler/codec/MessageToMessageDecoder;
            aload 1 /* ctx */
            aload 2 /* msg */
            invokevirtual io.netty.channel.socket.DatagramPacket.content:()Ljava/lang/Object;
            checkcast io.netty.buffer.ByteBuf
            aload 3 /* out */
            invokevirtual io.netty.handler.codec.MessageToMessageDecoder.decode:(Lio/netty/channel/ChannelHandlerContext;Ljava/lang/Object;Ljava/util/List;)V
         1: .line 60
            return
        end local 3 // java.util.List out
        end local 2 // io.netty.channel.socket.DatagramPacket msg
        end local 1 // io.netty.channel.ChannelHandlerContext ctx
        end local 0 // io.netty.handler.codec.DatagramPacketDecoder this
      LocalVariableTable:
        Start  End  Slot  Name  Signature
            0    2     0  this  Lio/netty/handler/codec/DatagramPacketDecoder;
            0    2     1   ctx  Lio/netty/channel/ChannelHandlerContext;
            0    2     2   msg  Lio/netty/channel/socket/DatagramPacket;
            0    2     3   out  Ljava/util/List<Ljava/lang/Object;>;
    Exceptions:
      throws java.lang.Exception
    Signature: (Lio/netty/channel/ChannelHandlerContext;Lio/netty/channel/socket/DatagramPacket;Ljava/util/List<Ljava/lang/Object;>;)V
    MethodParameters:
      Name  Flags
      ctx   
      msg   
      out   

  public void channelRegistered(io.netty.channel.ChannelHandlerContext);
    descriptor: (Lio/netty/channel/ChannelHandlerContext;)V
    flags: (0x0001) ACC_PUBLIC
    Code:
      stack=2, locals=2, args_size=2
        start local 0 // io.netty.handler.codec.DatagramPacketDecoder this
        start local 1 // io.netty.channel.ChannelHandlerContext ctx
         0: .line 64
            aload 0 /* this */
            getfield io.netty.handler.codec.DatagramPacketDecoder.decoder:Lio/netty/handler/codec/MessageToMessageDecoder;
            aload 1 /* ctx */
            invokevirtual io.netty.handler.codec.MessageToMessageDecoder.channelRegistered:(Lio/netty/channel/ChannelHandlerContext;)V
         1: .line 65
            return
        end local 1 // io.netty.channel.ChannelHandlerContext ctx
        end local 0 // io.netty.handler.codec.DatagramPacketDecoder this
      LocalVariableTable:
        Start  End  Slot  Name  Signature
            0    2     0  this  Lio/netty/handler/codec/DatagramPacketDecoder;
            0    2     1   ctx  Lio/netty/channel/ChannelHandlerContext;
    Exceptions:
      throws java.lang.Exception
    MethodParameters:
      Name  Flags
      ctx   

  public void channelUnregistered(io.netty.channel.ChannelHandlerContext);
    descriptor: (Lio/netty/channel/ChannelHandlerContext;)V
    flags: (0x0001) ACC_PUBLIC
    Code:
      stack=2, locals=2, args_size=2
        start local 0 // io.netty.handler.codec.DatagramPacketDecoder this
        start local 1 // io.netty.channel.ChannelHandlerContext ctx
         0: .line 69
            aload 0 /* this */
            getfield io.netty.handler.codec.DatagramPacketDecoder.decoder:Lio/netty/handler/codec/MessageToMessageDecoder;
            aload 1 /* ctx */
            invokevirtual io.netty.handler.codec.MessageToMessageDecoder.channelUnregistered:(Lio/netty/channel/ChannelHandlerContext;)V
         1: .line 70
            return
        end local 1 // io.netty.channel.ChannelHandlerContext ctx
        end local 0 // io.netty.handler.codec.DatagramPacketDecoder this
      LocalVariableTable:
        Start  End  Slot  Name  Signature
            0    2     0  this  Lio/netty/handler/codec/DatagramPacketDecoder;
            0    2     1   ctx  Lio/netty/channel/ChannelHandlerContext;
    Exceptions:
      throws java.lang.Exception
    MethodParameters:
      Name  Flags
      ctx   

  public void channelActive(io.netty.channel.ChannelHandlerContext);
    descriptor: (Lio/netty/channel/ChannelHandlerContext;)V
    flags: (0x0001) ACC_PUBLIC
    Code:
      stack=2, locals=2, args_size=2
        start local 0 // io.netty.handler.codec.DatagramPacketDecoder this
        start local 1 // io.netty.channel.ChannelHandlerContext ctx
         0: .line 74
            aload 0 /* this */
            getfield io.netty.handler.codec.DatagramPacketDecoder.decoder:Lio/netty/handler/codec/MessageToMessageDecoder;
            aload 1 /* ctx */
            invokevirtual io.netty.handler.codec.MessageToMessageDecoder.channelActive:(Lio/netty/channel/ChannelHandlerContext;)V
         1: .line 75
            return
        end local 1 // io.netty.channel.ChannelHandlerContext ctx
        end local 0 // io.netty.handler.codec.DatagramPacketDecoder this
      LocalVariableTable:
        Start  End  Slot  Name  Signature
            0    2     0  this  Lio/netty/handler/codec/DatagramPacketDecoder;
            0    2     1   ctx  Lio/netty/channel/ChannelHandlerContext;
    Exceptions:
      throws java.lang.Exception
    MethodParameters:
      Name  Flags
      ctx   

  public void channelInactive(io.netty.channel.ChannelHandlerContext);
    descriptor: (Lio/netty/channel/ChannelHandlerContext;)V
    flags: (0x0001) ACC_PUBLIC
    Code:
      stack=2, locals=2, args_size=2
        start local 0 // io.netty.handler.codec.DatagramPacketDecoder this
        start local 1 // io.netty.channel.ChannelHandlerContext ctx
         0: .line 79
            aload 0 /* this */
            getfield io.netty.handler.codec.DatagramPacketDecoder.decoder:Lio/netty/handler/codec/MessageToMessageDecoder;
            aload 1 /* ctx */
            invokevirtual io.netty.handler.codec.MessageToMessageDecoder.channelInactive:(Lio/netty/channel/ChannelHandlerContext;)V
         1: .line 80
            return
        end local 1 // io.netty.channel.ChannelHandlerContext ctx
        end local 0 // io.netty.handler.codec.DatagramPacketDecoder this
      LocalVariableTable:
        Start  End  Slot  Name  Signature
            0    2     0  this  Lio/netty/handler/codec/DatagramPacketDecoder;
            0    2     1   ctx  Lio/netty/channel/ChannelHandlerContext;
    Exceptions:
      throws java.lang.Exception
    MethodParameters:
      Name  Flags
      ctx   

  public void channelReadComplete(io.netty.channel.ChannelHandlerContext);
    descriptor: (Lio/netty/channel/ChannelHandlerContext;)V
    flags: (0x0001) ACC_PUBLIC
    Code:
      stack=2, locals=2, args_size=2
        start local 0 // io.netty.handler.codec.DatagramPacketDecoder this
        start local 1 // io.netty.channel.ChannelHandlerContext ctx
         0: .line 84
            aload 0 /* this */
            getfield io.netty.handler.codec.DatagramPacketDecoder.decoder:Lio/netty/handler/codec/MessageToMessageDecoder;
            aload 1 /* ctx */
            invokevirtual io.netty.handler.codec.MessageToMessageDecoder.channelReadComplete:(Lio/netty/channel/ChannelHandlerContext;)V
         1: .line 85
            return
        end local 1 // io.netty.channel.ChannelHandlerContext ctx
        end local 0 // io.netty.handler.codec.DatagramPacketDecoder this
      LocalVariableTable:
        Start  End  Slot  Name  Signature
            0    2     0  this  Lio/netty/handler/codec/DatagramPacketDecoder;
            0    2     1   ctx  Lio/netty/channel/ChannelHandlerContext;
    Exceptions:
      throws java.lang.Exception
    MethodParameters:
      Name  Flags
      ctx   

  public void userEventTriggered(io.netty.channel.ChannelHandlerContext, java.lang.Object);
    descriptor: (Lio/netty/channel/ChannelHandlerContext;Ljava/lang/Object;)V
    flags: (0x0001) ACC_PUBLIC
    Code:
      stack=3, locals=3, args_size=3
        start local 0 // io.netty.handler.codec.DatagramPacketDecoder this
        start local 1 // io.netty.channel.ChannelHandlerContext ctx
        start local 2 // java.lang.Object evt
         0: .line 89
            aload 0 /* this */
            getfield io.netty.handler.codec.DatagramPacketDecoder.decoder:Lio/netty/handler/codec/MessageToMessageDecoder;
            aload 1 /* ctx */
            aload 2 /* evt */
            invokevirtual io.netty.handler.codec.MessageToMessageDecoder.userEventTriggered:(Lio/netty/channel/ChannelHandlerContext;Ljava/lang/Object;)V
         1: .line 90
            return
        end local 2 // java.lang.Object evt
        end local 1 // io.netty.channel.ChannelHandlerContext ctx
        end local 0 // io.netty.handler.codec.DatagramPacketDecoder this
      LocalVariableTable:
        Start  End  Slot  Name  Signature
            0    2     0  this  Lio/netty/handler/codec/DatagramPacketDecoder;
            0    2     1   ctx  Lio/netty/channel/ChannelHandlerContext;
            0    2     2   evt  Ljava/lang/Object;
    Exceptions:
      throws java.lang.Exception
    MethodParameters:
      Name  Flags
      ctx   
      evt   

  public void channelWritabilityChanged(io.netty.channel.ChannelHandlerContext);
    descriptor: (Lio/netty/channel/ChannelHandlerContext;)V
    flags: (0x0001) ACC_PUBLIC
    Code:
      stack=2, locals=2, args_size=2
        start local 0 // io.netty.handler.codec.DatagramPacketDecoder this
        start local 1 // io.netty.channel.ChannelHandlerContext ctx
         0: .line 94
            aload 0 /* this */
            getfield io.netty.handler.codec.DatagramPacketDecoder.decoder:Lio/netty/handler/codec/MessageToMessageDecoder;
            aload 1 /* ctx */
            invokevirtual io.netty.handler.codec.MessageToMessageDecoder.channelWritabilityChanged:(Lio/netty/channel/ChannelHandlerContext;)V
         1: .line 95
            return
        end local 1 // io.netty.channel.ChannelHandlerContext ctx
        end local 0 // io.netty.handler.codec.DatagramPacketDecoder this
      LocalVariableTable:
        Start  End  Slot  Name  Signature
            0    2     0  this  Lio/netty/handler/codec/DatagramPacketDecoder;
            0    2     1   ctx  Lio/netty/channel/ChannelHandlerContext;
    Exceptions:
      throws java.lang.Exception
    MethodParameters:
      Name  Flags
      ctx   

  public void exceptionCaught(io.netty.channel.ChannelHandlerContext, java.lang.Throwable);
    descriptor: (Lio/netty/channel/ChannelHandlerContext;Ljava/lang/Throwable;)V
    flags: (0x0001) ACC_PUBLIC
    Code:
      stack=3, locals=3, args_size=3
        start local 0 // io.netty.handler.codec.DatagramPacketDecoder this
        start local 1 // io.netty.channel.ChannelHandlerContext ctx
        start local 2 // java.lang.Throwable cause
         0: .line 99
            aload 0 /* this */
            getfield io.netty.handler.codec.DatagramPacketDecoder.decoder:Lio/netty/handler/codec/MessageToMessageDecoder;
            aload 1 /* ctx */
            aload 2 /* cause */
            invokevirtual io.netty.handler.codec.MessageToMessageDecoder.exceptionCaught:(Lio/netty/channel/ChannelHandlerContext;Ljava/lang/Throwable;)V
         1: .line 100
            return
        end local 2 // java.lang.Throwable cause
        end local 1 // io.netty.channel.ChannelHandlerContext ctx
        end local 0 // io.netty.handler.codec.DatagramPacketDecoder this
      LocalVariableTable:
        Start  End  Slot   Name  Signature
            0    2     0   this  Lio/netty/handler/codec/DatagramPacketDecoder;
            0    2     1    ctx  Lio/netty/channel/ChannelHandlerContext;
            0    2     2  cause  Ljava/lang/Throwable;
    Exceptions:
      throws java.lang.Exception
    MethodParameters:
       Name  Flags
      ctx    
      cause  

  public void handlerAdded(io.netty.channel.ChannelHandlerContext);
    descriptor: (Lio/netty/channel/ChannelHandlerContext;)V
    flags: (0x0001) ACC_PUBLIC
    Code:
      stack=2, locals=2, args_size=2
        start local 0 // io.netty.handler.codec.DatagramPacketDecoder this
        start local 1 // io.netty.channel.ChannelHandlerContext ctx
         0: .line 104
            aload 0 /* this */
            getfield io.netty.handler.codec.DatagramPacketDecoder.decoder:Lio/netty/handler/codec/MessageToMessageDecoder;
            aload 1 /* ctx */
            invokevirtual io.netty.handler.codec.MessageToMessageDecoder.handlerAdded:(Lio/netty/channel/ChannelHandlerContext;)V
         1: .line 105
            return
        end local 1 // io.netty.channel.ChannelHandlerContext ctx
        end local 0 // io.netty.handler.codec.DatagramPacketDecoder this
      LocalVariableTable:
        Start  End  Slot  Name  Signature
            0    2     0  this  Lio/netty/handler/codec/DatagramPacketDecoder;
            0    2     1   ctx  Lio/netty/channel/ChannelHandlerContext;
    Exceptions:
      throws java.lang.Exception
    MethodParameters:
      Name  Flags
      ctx   

  public void handlerRemoved(io.netty.channel.ChannelHandlerContext);
    descriptor: (Lio/netty/channel/ChannelHandlerContext;)V
    flags: (0x0001) ACC_PUBLIC
    Code:
      stack=2, locals=2, args_size=2
        start local 0 // io.netty.handler.codec.DatagramPacketDecoder this
        start local 1 // io.netty.channel.ChannelHandlerContext ctx
         0: .line 109
            aload 0 /* this */
            getfield io.netty.handler.codec.DatagramPacketDecoder.decoder:Lio/netty/handler/codec/MessageToMessageDecoder;
            aload 1 /* ctx */
            invokevirtual io.netty.handler.codec.MessageToMessageDecoder.handlerRemoved:(Lio/netty/channel/ChannelHandlerContext;)V
         1: .line 110
            return
        end local 1 // io.netty.channel.ChannelHandlerContext ctx
        end local 0 // io.netty.handler.codec.DatagramPacketDecoder this
      LocalVariableTable:
        Start  End  Slot  Name  Signature
            0    2     0  this  Lio/netty/handler/codec/DatagramPacketDecoder;
            0    2     1   ctx  Lio/netty/channel/ChannelHandlerContext;
    Exceptions:
      throws java.lang.Exception
    MethodParameters:
      Name  Flags
      ctx   

  public boolean isSharable();
    descriptor: ()Z
    flags: (0x0001) ACC_PUBLIC
    Code:
      stack=1, locals=1, args_size=1
        start local 0 // io.netty.handler.codec.DatagramPacketDecoder this
         0: .line 114
            aload 0 /* this */
            getfield io.netty.handler.codec.DatagramPacketDecoder.decoder:Lio/netty/handler/codec/MessageToMessageDecoder;
            invokevirtual io.netty.handler.codec.MessageToMessageDecoder.isSharable:()Z
            ireturn
        end local 0 // io.netty.handler.codec.DatagramPacketDecoder this
      LocalVariableTable:
        Start  End  Slot  Name  Signature
            0    1     0  this  Lio/netty/handler/codec/DatagramPacketDecoder;

  protected void decode(io.netty.channel.ChannelHandlerContext, java.lang.Object, java.util.List);
    descriptor: (Lio/netty/channel/ChannelHandlerContext;Ljava/lang/Object;Ljava/util/List;)V
    flags: (0x1044) ACC_PROTECTED, ACC_BRIDGE, ACC_SYNTHETIC
    Code:
      stack=4, locals=4, args_size=4
         0: .line 1
            aload 0
            aload 1
            aload 2
            checkcast io.netty.channel.socket.DatagramPacket
            aload 3
            invokevirtual io.netty.handler.codec.DatagramPacketDecoder.decode:(Lio/netty/channel/ChannelHandlerContext;Lio/netty/channel/socket/DatagramPacket;Ljava/util/List;)V
            return
      LocalVariableTable:
        Start  End  Slot  Name  Signature
    Exceptions:
      throws java.lang.Exception
}
Signature: Lio/netty/handler/codec/MessageToMessageDecoder<Lio/netty/channel/socket/DatagramPacket;>;
SourceFile: "DatagramPacketDecoder.java"