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 abstract class io.netty.channel.SimpleChannelInboundHandler<I> extends io.netty.channel.ChannelInboundHandlerAdapter
  minor version: 0
  major version: 59
  flags: flags: (0x0421) ACC_PUBLIC, ACC_SUPER, ACC_ABSTRACT
  this_class: io.netty.channel.SimpleChannelInboundHandler
  super_class: io.netty.channel.ChannelInboundHandlerAdapter
{
  private final io.netty.util.internal.TypeParameterMatcher matcher;
    descriptor: Lio/netty/util/internal/TypeParameterMatcher;
    flags: (0x0012) ACC_PRIVATE, ACC_FINAL

  private final boolean autoRelease;
    descriptor: Z
    flags: (0x0012) ACC_PRIVATE, ACC_FINAL

  protected void <init>();
    descriptor: ()V
    flags: (0x0004) ACC_PROTECTED
    Code:
      stack=2, locals=1, args_size=1
        start local 0 // io.netty.channel.SimpleChannelInboundHandler this
         0: .line 57
            aload 0 /* this */
            iconst_1
            invokespecial io.netty.channel.SimpleChannelInboundHandler.<init>:(Z)V
         1: .line 58
            return
        end local 0 // io.netty.channel.SimpleChannelInboundHandler this
      LocalVariableTable:
        Start  End  Slot  Name  Signature
            0    2     0  this  Lio/netty/channel/SimpleChannelInboundHandler<TI;>;

  protected void <init>(boolean);
    descriptor: (Z)V
    flags: (0x0004) ACC_PROTECTED
    Code:
      stack=4, locals=2, args_size=2
        start local 0 // io.netty.channel.SimpleChannelInboundHandler this
        start local 1 // boolean autoRelease
         0: .line 66
            aload 0 /* this */
            invokespecial io.netty.channel.ChannelInboundHandlerAdapter.<init>:()V
         1: .line 67
            aload 0 /* this */
            aload 0 /* this */
            ldc Lio/netty/channel/SimpleChannelInboundHandler;
            ldc "I"
            invokestatic io.netty.util.internal.TypeParameterMatcher.find:(Ljava/lang/Object;Ljava/lang/Class;Ljava/lang/String;)Lio/netty/util/internal/TypeParameterMatcher;
            putfield io.netty.channel.SimpleChannelInboundHandler.matcher:Lio/netty/util/internal/TypeParameterMatcher;
         2: .line 68
            aload 0 /* this */
            iload 1 /* autoRelease */
            putfield io.netty.channel.SimpleChannelInboundHandler.autoRelease:Z
         3: .line 69
            return
        end local 1 // boolean autoRelease
        end local 0 // io.netty.channel.SimpleChannelInboundHandler this
      LocalVariableTable:
        Start  End  Slot         Name  Signature
            0    4     0         this  Lio/netty/channel/SimpleChannelInboundHandler<TI;>;
            0    4     1  autoRelease  Z
    MethodParameters:
             Name  Flags
      autoRelease  

  protected void <init>(java.lang.Class<? extends I>);
    descriptor: (Ljava/lang/Class;)V
    flags: (0x0004) ACC_PROTECTED
    Code:
      stack=3, locals=2, args_size=2
        start local 0 // io.netty.channel.SimpleChannelInboundHandler this
        start local 1 // java.lang.Class inboundMessageType
         0: .line 75
            aload 0 /* this */
            aload 1 /* inboundMessageType */
            iconst_1
            invokespecial io.netty.channel.SimpleChannelInboundHandler.<init>:(Ljava/lang/Class;Z)V
         1: .line 76
            return
        end local 1 // java.lang.Class inboundMessageType
        end local 0 // io.netty.channel.SimpleChannelInboundHandler this
      LocalVariableTable:
        Start  End  Slot                Name  Signature
            0    2     0                this  Lio/netty/channel/SimpleChannelInboundHandler<TI;>;
            0    2     1  inboundMessageType  Ljava/lang/Class<+TI;>;
    Signature: (Ljava/lang/Class<+TI;>;)V
    MethodParameters:
                    Name  Flags
      inboundMessageType  

  protected void <init>(java.lang.Class<? extends I>, );
    descriptor: (Ljava/lang/Class;Z)V
    flags: (0x0004) ACC_PROTECTED
    Code:
      stack=2, locals=3, args_size=3
        start local 0 // io.netty.channel.SimpleChannelInboundHandler this
        start local 1 // java.lang.Class inboundMessageType
        start local 2 // boolean autoRelease
         0: .line 85
            aload 0 /* this */
            invokespecial io.netty.channel.ChannelInboundHandlerAdapter.<init>:()V
         1: .line 86
            aload 0 /* this */
            aload 1 /* inboundMessageType */
            invokestatic io.netty.util.internal.TypeParameterMatcher.get:(Ljava/lang/Class;)Lio/netty/util/internal/TypeParameterMatcher;
            putfield io.netty.channel.SimpleChannelInboundHandler.matcher:Lio/netty/util/internal/TypeParameterMatcher;
         2: .line 87
            aload 0 /* this */
            iload 2 /* autoRelease */
            putfield io.netty.channel.SimpleChannelInboundHandler.autoRelease:Z
         3: .line 88
            return
        end local 2 // boolean autoRelease
        end local 1 // java.lang.Class inboundMessageType
        end local 0 // io.netty.channel.SimpleChannelInboundHandler this
      LocalVariableTable:
        Start  End  Slot                Name  Signature
            0    4     0                this  Lio/netty/channel/SimpleChannelInboundHandler<TI;>;
            0    4     1  inboundMessageType  Ljava/lang/Class<+TI;>;
            0    4     2         autoRelease  Z
    Signature: (Ljava/lang/Class<+TI;>;Z)V
    MethodParameters:
                    Name  Flags
      inboundMessageType  
      autoRelease         

  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.channel.SimpleChannelInboundHandler this
        start local 1 // java.lang.Object msg
         0: .line 95
            aload 0 /* this */
            getfield io.netty.channel.SimpleChannelInboundHandler.matcher:Lio/netty/util/internal/TypeParameterMatcher;
            aload 1 /* msg */
            invokevirtual io.netty.util.internal.TypeParameterMatcher.match:(Ljava/lang/Object;)Z
            ireturn
        end local 1 // java.lang.Object msg
        end local 0 // io.netty.channel.SimpleChannelInboundHandler this
      LocalVariableTable:
        Start  End  Slot  Name  Signature
            0    1     0  this  Lio/netty/channel/SimpleChannelInboundHandler<TI;>;
            0    1     1   msg  Ljava/lang/Object;
    Exceptions:
      throws java.lang.Exception
    MethodParameters:
      Name  Flags
      msg   

  public void channelRead(io.netty.channel.ChannelHandlerContext, java.lang.Object);
    descriptor: (Lio/netty/channel/ChannelHandlerContext;Ljava/lang/Object;)V
    flags: (0x0001) ACC_PUBLIC
    Code:
      stack=3, locals=6, args_size=3
        start local 0 // io.netty.channel.SimpleChannelInboundHandler this
        start local 1 // io.netty.channel.ChannelHandlerContext ctx
        start local 2 // java.lang.Object msg
         0: .line 100
            iconst_1
            istore 3 /* release */
        start local 3 // boolean release
         1: .line 102
            aload 0 /* this */
            aload 2 /* msg */
            invokevirtual io.netty.channel.SimpleChannelInboundHandler.acceptInboundMessage:(Ljava/lang/Object;)Z
            ifeq 5
         2: .line 104
            aload 2 /* msg */
            astore 4 /* imsg */
        start local 4 // java.lang.Object imsg
         3: .line 105
            aload 0 /* this */
            aload 1 /* ctx */
            aload 4 /* imsg */
            invokevirtual io.netty.channel.SimpleChannelInboundHandler.channelRead0:(Lio/netty/channel/ChannelHandlerContext;Ljava/lang/Object;)V
        end local 4 // java.lang.Object imsg
         4: .line 106
            goto 12
         5: .line 107
      StackMap locals: int
      StackMap stack:
            iconst_0
            istore 3 /* release */
         6: .line 108
            aload 1 /* ctx */
            aload 2 /* msg */
            invokeinterface io.netty.channel.ChannelHandlerContext.fireChannelRead:(Ljava/lang/Object;)Lio/netty/channel/ChannelHandlerContext;
            pop
         7: .line 110
            goto 12
      StackMap locals:
      StackMap stack: java.lang.Throwable
         8: astore 5
         9: .line 111
            aload 0 /* this */
            getfield io.netty.channel.SimpleChannelInboundHandler.autoRelease:Z
            ifeq 11
            iload 3 /* release */
            ifeq 11
        10: .line 112
            aload 2 /* msg */
            invokestatic io.netty.util.ReferenceCountUtil.release:(Ljava/lang/Object;)Z
            pop
        11: .line 114
      StackMap locals: io.netty.channel.SimpleChannelInboundHandler io.netty.channel.ChannelHandlerContext java.lang.Object int top java.lang.Throwable
      StackMap stack:
            aload 5
            athrow
        12: .line 111
      StackMap locals: io.netty.channel.SimpleChannelInboundHandler io.netty.channel.ChannelHandlerContext java.lang.Object int
      StackMap stack:
            aload 0 /* this */
            getfield io.netty.channel.SimpleChannelInboundHandler.autoRelease:Z
            ifeq 14
            iload 3 /* release */
            ifeq 14
        13: .line 112
            aload 2 /* msg */
            invokestatic io.netty.util.ReferenceCountUtil.release:(Ljava/lang/Object;)Z
            pop
        14: .line 115
      StackMap locals:
      StackMap stack:
            return
        end local 3 // boolean release
        end local 2 // java.lang.Object msg
        end local 1 // io.netty.channel.ChannelHandlerContext ctx
        end local 0 // io.netty.channel.SimpleChannelInboundHandler this
      LocalVariableTable:
        Start  End  Slot     Name  Signature
            0   15     0     this  Lio/netty/channel/SimpleChannelInboundHandler<TI;>;
            0   15     1      ctx  Lio/netty/channel/ChannelHandlerContext;
            0   15     2      msg  Ljava/lang/Object;
            1   15     3  release  Z
            3    4     4     imsg  TI;
      Exception table:
        from    to  target  type
           1     8       8  any
    Exceptions:
      throws java.lang.Exception
    MethodParameters:
      Name  Flags
      ctx   
      msg   

  protected abstract void channelRead0(io.netty.channel.ChannelHandlerContext, );
    descriptor: (Lio/netty/channel/ChannelHandlerContext;Ljava/lang/Object;)V
    flags: (0x0404) ACC_PROTECTED, ACC_ABSTRACT
    Exceptions:
      throws java.lang.Exception
    Signature: (Lio/netty/channel/ChannelHandlerContext;TI;)V
    MethodParameters:
      Name  Flags
      ctx   
      msg   
}
Signature: <I:Ljava/lang/Object;>Lio/netty/channel/ChannelInboundHandlerAdapter;
SourceFile: "SimpleChannelInboundHandler.java"