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.flow.FlowControlHandler extends io.netty.channel.ChannelDuplexHandler
  minor version: 0
  major version: 59
  flags: flags: (0x0021) ACC_PUBLIC, ACC_SUPER
  this_class: io.netty.handler.flow.FlowControlHandler
  super_class: io.netty.channel.ChannelDuplexHandler
{
  private static final io.netty.util.internal.logging.InternalLogger logger;
    descriptor: Lio/netty/util/internal/logging/InternalLogger;
    flags: (0x001a) ACC_PRIVATE, ACC_STATIC, ACC_FINAL

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

  private io.netty.handler.flow.FlowControlHandler$RecyclableArrayDeque queue;
    descriptor: Lio/netty/handler/flow/FlowControlHandler$RecyclableArrayDeque;
    flags: (0x0002) ACC_PRIVATE

  private io.netty.channel.ChannelConfig config;
    descriptor: Lio/netty/channel/ChannelConfig;
    flags: (0x0002) ACC_PRIVATE

  private boolean shouldConsume;
    descriptor: Z
    flags: (0x0002) ACC_PRIVATE

  static void <clinit>();
    descriptor: ()V
    flags: (0x0008) ACC_STATIC
    Code:
      stack=1, locals=0, args_size=0
         0: .line 68
            ldc Lio/netty/handler/flow/FlowControlHandler;
            invokestatic io.netty.util.internal.logging.InternalLoggerFactory.getInstance:(Ljava/lang/Class;)Lio/netty/util/internal/logging/InternalLogger;
            putstatic io.netty.handler.flow.FlowControlHandler.logger:Lio/netty/util/internal/logging/InternalLogger;
            return
      LocalVariableTable:
        Start  End  Slot  Name  Signature

  public void <init>();
    descriptor: ()V
    flags: (0x0001) ACC_PUBLIC
    Code:
      stack=2, locals=1, args_size=1
        start local 0 // io.netty.handler.flow.FlowControlHandler this
         0: .line 79
            aload 0 /* this */
            iconst_1
            invokespecial io.netty.handler.flow.FlowControlHandler.<init>:(Z)V
         1: .line 80
            return
        end local 0 // io.netty.handler.flow.FlowControlHandler this
      LocalVariableTable:
        Start  End  Slot  Name  Signature
            0    2     0  this  Lio/netty/handler/flow/FlowControlHandler;

  public void <init>(boolean);
    descriptor: (Z)V
    flags: (0x0001) ACC_PUBLIC
    Code:
      stack=2, locals=2, args_size=2
        start local 0 // io.netty.handler.flow.FlowControlHandler this
        start local 1 // boolean releaseMessages
         0: .line 82
            aload 0 /* this */
            invokespecial io.netty.channel.ChannelDuplexHandler.<init>:()V
         1: .line 83
            aload 0 /* this */
            iload 1 /* releaseMessages */
            putfield io.netty.handler.flow.FlowControlHandler.releaseMessages:Z
         2: .line 84
            return
        end local 1 // boolean releaseMessages
        end local 0 // io.netty.handler.flow.FlowControlHandler this
      LocalVariableTable:
        Start  End  Slot             Name  Signature
            0    3     0             this  Lio/netty/handler/flow/FlowControlHandler;
            0    3     1  releaseMessages  Z
    MethodParameters:
                 Name  Flags
      releaseMessages  

  boolean isQueueEmpty();
    descriptor: ()Z
    flags: (0x0000) 
    Code:
      stack=1, locals=1, args_size=1
        start local 0 // io.netty.handler.flow.FlowControlHandler this
         0: .line 91
            aload 0 /* this */
            getfield io.netty.handler.flow.FlowControlHandler.queue:Lio/netty/handler/flow/FlowControlHandler$RecyclableArrayDeque;
            invokevirtual io.netty.handler.flow.FlowControlHandler$RecyclableArrayDeque.isEmpty:()Z
            ireturn
        end local 0 // io.netty.handler.flow.FlowControlHandler this
      LocalVariableTable:
        Start  End  Slot  Name  Signature
            0    1     0  this  Lio/netty/handler/flow/FlowControlHandler;

  private void destroy();
    descriptor: ()V
    flags: (0x0002) ACC_PRIVATE
    Code:
      stack=3, locals=2, args_size=1
        start local 0 // io.netty.handler.flow.FlowControlHandler this
         0: .line 98
            aload 0 /* this */
            getfield io.netty.handler.flow.FlowControlHandler.queue:Lio/netty/handler/flow/FlowControlHandler$RecyclableArrayDeque;
            ifnull 10
         1: .line 100
            aload 0 /* this */
            getfield io.netty.handler.flow.FlowControlHandler.queue:Lio/netty/handler/flow/FlowControlHandler$RecyclableArrayDeque;
            invokevirtual io.netty.handler.flow.FlowControlHandler$RecyclableArrayDeque.isEmpty:()Z
            ifne 8
         2: .line 101
            getstatic io.netty.handler.flow.FlowControlHandler.logger:Lio/netty/util/internal/logging/InternalLogger;
            ldc "Non-empty queue: {}"
            aload 0 /* this */
            getfield io.netty.handler.flow.FlowControlHandler.queue:Lio/netty/handler/flow/FlowControlHandler$RecyclableArrayDeque;
            invokeinterface io.netty.util.internal.logging.InternalLogger.trace:(Ljava/lang/String;Ljava/lang/Object;)V
         3: .line 103
            aload 0 /* this */
            getfield io.netty.handler.flow.FlowControlHandler.releaseMessages:Z
            ifeq 8
         4: .line 105
            goto 6
        start local 1 // java.lang.Object msg
         5: .line 106
      StackMap locals: java.lang.Object
      StackMap stack:
            aload 1 /* msg */
            invokestatic io.netty.util.ReferenceCountUtil.safeRelease:(Ljava/lang/Object;)V
        end local 1 // java.lang.Object msg
         6: .line 105
      StackMap locals:
      StackMap stack:
            aload 0 /* this */
            getfield io.netty.handler.flow.FlowControlHandler.queue:Lio/netty/handler/flow/FlowControlHandler$RecyclableArrayDeque;
            invokevirtual io.netty.handler.flow.FlowControlHandler$RecyclableArrayDeque.poll:()Ljava/lang/Object;
            dup
            astore 1 /* msg */
        start local 1 // java.lang.Object msg
         7: ifnonnull 5
        end local 1 // java.lang.Object msg
         8: .line 111
      StackMap locals:
      StackMap stack:
            aload 0 /* this */
            getfield io.netty.handler.flow.FlowControlHandler.queue:Lio/netty/handler/flow/FlowControlHandler$RecyclableArrayDeque;
            invokevirtual io.netty.handler.flow.FlowControlHandler$RecyclableArrayDeque.recycle:()V
         9: .line 112
            aload 0 /* this */
            aconst_null
            putfield io.netty.handler.flow.FlowControlHandler.queue:Lio/netty/handler/flow/FlowControlHandler$RecyclableArrayDeque;
        10: .line 114
      StackMap locals:
      StackMap stack:
            return
        end local 0 // io.netty.handler.flow.FlowControlHandler this
      LocalVariableTable:
        Start  End  Slot  Name  Signature
            0   11     0  this  Lio/netty/handler/flow/FlowControlHandler;
            5    6     1   msg  Ljava/lang/Object;
            7    8     1   msg  Ljava/lang/Object;

  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.flow.FlowControlHandler this
        start local 1 // io.netty.channel.ChannelHandlerContext ctx
         0: .line 118
            aload 0 /* this */
            aload 1 /* ctx */
            invokeinterface io.netty.channel.ChannelHandlerContext.channel:()Lio/netty/channel/Channel;
            invokeinterface io.netty.channel.Channel.config:()Lio/netty/channel/ChannelConfig;
            putfield io.netty.handler.flow.FlowControlHandler.config:Lio/netty/channel/ChannelConfig;
         1: .line 119
            return
        end local 1 // io.netty.channel.ChannelHandlerContext ctx
        end local 0 // io.netty.handler.flow.FlowControlHandler this
      LocalVariableTable:
        Start  End  Slot  Name  Signature
            0    2     0  this  Lio/netty/handler/flow/FlowControlHandler;
            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=1, locals=2, args_size=2
        start local 0 // io.netty.handler.flow.FlowControlHandler this
        start local 1 // io.netty.channel.ChannelHandlerContext ctx
         0: .line 123
            aload 0 /* this */
            invokevirtual io.netty.handler.flow.FlowControlHandler.destroy:()V
         1: .line 124
            aload 1 /* ctx */
            invokeinterface io.netty.channel.ChannelHandlerContext.fireChannelInactive:()Lio/netty/channel/ChannelHandlerContext;
            pop
         2: .line 125
            return
        end local 1 // io.netty.channel.ChannelHandlerContext ctx
        end local 0 // io.netty.handler.flow.FlowControlHandler this
      LocalVariableTable:
        Start  End  Slot  Name  Signature
            0    3     0  this  Lio/netty/handler/flow/FlowControlHandler;
            0    3     1   ctx  Lio/netty/channel/ChannelHandlerContext;
    Exceptions:
      throws java.lang.Exception
    MethodParameters:
      Name  Flags
      ctx   

  public void read(io.netty.channel.ChannelHandlerContext);
    descriptor: (Lio/netty/channel/ChannelHandlerContext;)V
    flags: (0x0001) ACC_PUBLIC
    Code:
      stack=3, locals=2, args_size=2
        start local 0 // io.netty.handler.flow.FlowControlHandler this
        start local 1 // io.netty.channel.ChannelHandlerContext ctx
         0: .line 129
            aload 0 /* this */
            aload 1 /* ctx */
            iconst_1
            invokevirtual io.netty.handler.flow.FlowControlHandler.dequeue:(Lio/netty/channel/ChannelHandlerContext;I)I
            ifne 3
         1: .line 133
            aload 0 /* this */
            iconst_1
            putfield io.netty.handler.flow.FlowControlHandler.shouldConsume:Z
         2: .line 134
            aload 1 /* ctx */
            invokeinterface io.netty.channel.ChannelHandlerContext.read:()Lio/netty/channel/ChannelHandlerContext;
            pop
         3: .line 136
      StackMap locals:
      StackMap stack:
            return
        end local 1 // io.netty.channel.ChannelHandlerContext ctx
        end local 0 // io.netty.handler.flow.FlowControlHandler this
      LocalVariableTable:
        Start  End  Slot  Name  Signature
            0    4     0  this  Lio/netty/handler/flow/FlowControlHandler;
            0    4     1   ctx  Lio/netty/channel/ChannelHandlerContext;
    Exceptions:
      throws java.lang.Exception
    MethodParameters:
      Name  Flags
      ctx   

  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=4, args_size=3
        start local 0 // io.netty.handler.flow.FlowControlHandler this
        start local 1 // io.netty.channel.ChannelHandlerContext ctx
        start local 2 // java.lang.Object msg
         0: .line 140
            aload 0 /* this */
            getfield io.netty.handler.flow.FlowControlHandler.queue:Lio/netty/handler/flow/FlowControlHandler$RecyclableArrayDeque;
            ifnonnull 2
         1: .line 141
            aload 0 /* this */
            invokestatic io.netty.handler.flow.FlowControlHandler$RecyclableArrayDeque.newInstance:()Lio/netty/handler/flow/FlowControlHandler$RecyclableArrayDeque;
            putfield io.netty.handler.flow.FlowControlHandler.queue:Lio/netty/handler/flow/FlowControlHandler$RecyclableArrayDeque;
         2: .line 144
      StackMap locals:
      StackMap stack:
            aload 0 /* this */
            getfield io.netty.handler.flow.FlowControlHandler.queue:Lio/netty/handler/flow/FlowControlHandler$RecyclableArrayDeque;
            aload 2 /* msg */
            invokevirtual io.netty.handler.flow.FlowControlHandler$RecyclableArrayDeque.offer:(Ljava/lang/Object;)Z
            pop
         3: .line 149
            aload 0 /* this */
            getfield io.netty.handler.flow.FlowControlHandler.shouldConsume:Z
            ifeq 4
            iconst_1
            goto 5
      StackMap locals:
      StackMap stack:
         4: iconst_0
      StackMap locals:
      StackMap stack: int
         5: istore 3 /* minConsume */
        start local 3 // int minConsume
         6: .line 150
            aload 0 /* this */
            iconst_0
            putfield io.netty.handler.flow.FlowControlHandler.shouldConsume:Z
         7: .line 152
            aload 0 /* this */
            aload 1 /* ctx */
            iload 3 /* minConsume */
            invokevirtual io.netty.handler.flow.FlowControlHandler.dequeue:(Lio/netty/channel/ChannelHandlerContext;I)I
            pop
         8: .line 153
            return
        end local 3 // int minConsume
        end local 2 // java.lang.Object msg
        end local 1 // io.netty.channel.ChannelHandlerContext ctx
        end local 0 // io.netty.handler.flow.FlowControlHandler this
      LocalVariableTable:
        Start  End  Slot        Name  Signature
            0    9     0        this  Lio/netty/handler/flow/FlowControlHandler;
            0    9     1         ctx  Lio/netty/channel/ChannelHandlerContext;
            0    9     2         msg  Ljava/lang/Object;
            6    9     3  minConsume  I
    Exceptions:
      throws java.lang.Exception
    MethodParameters:
      Name  Flags
      ctx   
      msg   

  public void channelReadComplete(io.netty.channel.ChannelHandlerContext);
    descriptor: (Lio/netty/channel/ChannelHandlerContext;)V
    flags: (0x0001) ACC_PUBLIC
    Code:
      stack=0, locals=2, args_size=2
        start local 0 // io.netty.handler.flow.FlowControlHandler this
        start local 1 // io.netty.channel.ChannelHandlerContext ctx
         0: .line 160
            return
        end local 1 // io.netty.channel.ChannelHandlerContext ctx
        end local 0 // io.netty.handler.flow.FlowControlHandler this
      LocalVariableTable:
        Start  End  Slot  Name  Signature
            0    1     0  this  Lio/netty/handler/flow/FlowControlHandler;
            0    1     1   ctx  Lio/netty/channel/ChannelHandlerContext;
    Exceptions:
      throws java.lang.Exception
    MethodParameters:
      Name  Flags
      ctx   

  private int dequeue(io.netty.channel.ChannelHandlerContext, int);
    descriptor: (Lio/netty/channel/ChannelHandlerContext;I)I
    flags: (0x0002) ACC_PRIVATE
    Code:
      stack=2, locals=5, args_size=3
        start local 0 // io.netty.handler.flow.FlowControlHandler this
        start local 1 // io.netty.channel.ChannelHandlerContext ctx
        start local 2 // int minConsume
         0: .line 175
            aload 0 /* this */
            getfield io.netty.handler.flow.FlowControlHandler.queue:Lio/netty/handler/flow/FlowControlHandler$RecyclableArrayDeque;
            ifnull 12
         1: .line 177
            iconst_0
            istore 3 /* consumed */
        start local 3 // int consumed
         2: .line 180
            goto 8
         3: .line 181
      StackMap locals: int
      StackMap stack:
            aload 0 /* this */
            getfield io.netty.handler.flow.FlowControlHandler.queue:Lio/netty/handler/flow/FlowControlHandler$RecyclableArrayDeque;
            invokevirtual io.netty.handler.flow.FlowControlHandler$RecyclableArrayDeque.poll:()Ljava/lang/Object;
            astore 4 /* msg */
        start local 4 // java.lang.Object msg
         4: .line 182
            aload 4 /* msg */
            ifnonnull 6
         5: .line 183
            goto 9
         6: .line 186
      StackMap locals: java.lang.Object
      StackMap stack:
            iinc 3 /* consumed */ 1
         7: .line 187
            aload 1 /* ctx */
            aload 4 /* msg */
            invokeinterface io.netty.channel.ChannelHandlerContext.fireChannelRead:(Ljava/lang/Object;)Lio/netty/channel/ChannelHandlerContext;
            pop
        end local 4 // java.lang.Object msg
         8: .line 180
      StackMap locals:
      StackMap stack:
            iload 3 /* consumed */
            iload 2 /* minConsume */
            if_icmplt 3
            aload 0 /* this */
            getfield io.netty.handler.flow.FlowControlHandler.config:Lio/netty/channel/ChannelConfig;
            invokeinterface io.netty.channel.ChannelConfig.isAutoRead:()Z
            ifne 3
         9: .line 193
      StackMap locals:
      StackMap stack:
            aload 0 /* this */
            getfield io.netty.handler.flow.FlowControlHandler.queue:Lio/netty/handler/flow/FlowControlHandler$RecyclableArrayDeque;
            invokevirtual io.netty.handler.flow.FlowControlHandler$RecyclableArrayDeque.isEmpty:()Z
            ifeq 11
            iload 3 /* consumed */
            ifle 11
        10: .line 194
            aload 1 /* ctx */
            invokeinterface io.netty.channel.ChannelHandlerContext.fireChannelReadComplete:()Lio/netty/channel/ChannelHandlerContext;
            pop
        11: .line 197
      StackMap locals:
      StackMap stack:
            iload 3 /* consumed */
            ireturn
        end local 3 // int consumed
        12: .line 200
      StackMap locals:
      StackMap stack:
            iconst_0
            ireturn
        end local 2 // int minConsume
        end local 1 // io.netty.channel.ChannelHandlerContext ctx
        end local 0 // io.netty.handler.flow.FlowControlHandler this
      LocalVariableTable:
        Start  End  Slot        Name  Signature
            0   13     0        this  Lio/netty/handler/flow/FlowControlHandler;
            0   13     1         ctx  Lio/netty/channel/ChannelHandlerContext;
            0   13     2  minConsume  I
            2   12     3    consumed  I
            4    8     4         msg  Ljava/lang/Object;
    MethodParameters:
            Name  Flags
      ctx         
      minConsume  
}
SourceFile: "FlowControlHandler.java"
NestMembers:
  io.netty.handler.flow.FlowControlHandler$RecyclableArrayDeque  io.netty.handler.flow.FlowControlHandler$RecyclableArrayDeque$1
InnerClasses:
  private final RecyclableArrayDeque = io.netty.handler.flow.FlowControlHandler$RecyclableArrayDeque of io.netty.handler.flow.FlowControlHandler