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) 
abstract class io.netty.handler.ssl.ConscryptAlpnSslEngine extends io.netty.handler.ssl.JdkSslEngine
  minor version: 0
  major version: 59
  flags: flags: (0x0420) ACC_SUPER, ACC_ABSTRACT
  this_class: io.netty.handler.ssl.ConscryptAlpnSslEngine
  super_class: io.netty.handler.ssl.JdkSslEngine
{
  private static final boolean USE_BUFFER_ALLOCATOR;
    descriptor: Z
    flags: (0x001a) ACC_PRIVATE, ACC_STATIC, ACC_FINAL

  static void <clinit>();
    descriptor: ()V
    flags: (0x0008) ACC_STATIC
    Code:
      stack=2, locals=0, args_size=0
         0: .line 45
            ldc "io.netty.handler.ssl.conscrypt.useBufferAllocator"
            iconst_1
         1: .line 44
            invokestatic io.netty.util.internal.SystemPropertyUtil.getBoolean:(Ljava/lang/String;Z)Z
            putstatic io.netty.handler.ssl.ConscryptAlpnSslEngine.USE_BUFFER_ALLOCATOR:Z
         2: .line 45
            return
      LocalVariableTable:
        Start  End  Slot  Name  Signature

  static io.netty.handler.ssl.ConscryptAlpnSslEngine newClientEngine(javax.net.ssl.SSLEngine, io.netty.buffer.ByteBufAllocator, io.netty.handler.ssl.JdkApplicationProtocolNegotiator);
    descriptor: (Ljavax/net/ssl/SSLEngine;Lio/netty/buffer/ByteBufAllocator;Lio/netty/handler/ssl/JdkApplicationProtocolNegotiator;)Lio/netty/handler/ssl/ConscryptAlpnSslEngine;
    flags: (0x0008) ACC_STATIC
    Code:
      stack=5, locals=3, args_size=3
        start local 0 // javax.net.ssl.SSLEngine engine
        start local 1 // io.netty.buffer.ByteBufAllocator alloc
        start local 2 // io.netty.handler.ssl.JdkApplicationProtocolNegotiator applicationNegotiator
         0: .line 49
            new io.netty.handler.ssl.ConscryptAlpnSslEngine$ClientEngine
            dup
            aload 0 /* engine */
            aload 1 /* alloc */
            aload 2 /* applicationNegotiator */
            invokespecial io.netty.handler.ssl.ConscryptAlpnSslEngine$ClientEngine.<init>:(Ljavax/net/ssl/SSLEngine;Lio/netty/buffer/ByteBufAllocator;Lio/netty/handler/ssl/JdkApplicationProtocolNegotiator;)V
            areturn
        end local 2 // io.netty.handler.ssl.JdkApplicationProtocolNegotiator applicationNegotiator
        end local 1 // io.netty.buffer.ByteBufAllocator alloc
        end local 0 // javax.net.ssl.SSLEngine engine
      LocalVariableTable:
        Start  End  Slot                   Name  Signature
            0    1     0                 engine  Ljavax/net/ssl/SSLEngine;
            0    1     1                  alloc  Lio/netty/buffer/ByteBufAllocator;
            0    1     2  applicationNegotiator  Lio/netty/handler/ssl/JdkApplicationProtocolNegotiator;
    MethodParameters:
                       Name  Flags
      engine                 
      alloc                  
      applicationNegotiator  

  static io.netty.handler.ssl.ConscryptAlpnSslEngine newServerEngine(javax.net.ssl.SSLEngine, io.netty.buffer.ByteBufAllocator, io.netty.handler.ssl.JdkApplicationProtocolNegotiator);
    descriptor: (Ljavax/net/ssl/SSLEngine;Lio/netty/buffer/ByteBufAllocator;Lio/netty/handler/ssl/JdkApplicationProtocolNegotiator;)Lio/netty/handler/ssl/ConscryptAlpnSslEngine;
    flags: (0x0008) ACC_STATIC
    Code:
      stack=5, locals=3, args_size=3
        start local 0 // javax.net.ssl.SSLEngine engine
        start local 1 // io.netty.buffer.ByteBufAllocator alloc
        start local 2 // io.netty.handler.ssl.JdkApplicationProtocolNegotiator applicationNegotiator
         0: .line 54
            new io.netty.handler.ssl.ConscryptAlpnSslEngine$ServerEngine
            dup
            aload 0 /* engine */
            aload 1 /* alloc */
            aload 2 /* applicationNegotiator */
            invokespecial io.netty.handler.ssl.ConscryptAlpnSslEngine$ServerEngine.<init>:(Ljavax/net/ssl/SSLEngine;Lio/netty/buffer/ByteBufAllocator;Lio/netty/handler/ssl/JdkApplicationProtocolNegotiator;)V
            areturn
        end local 2 // io.netty.handler.ssl.JdkApplicationProtocolNegotiator applicationNegotiator
        end local 1 // io.netty.buffer.ByteBufAllocator alloc
        end local 0 // javax.net.ssl.SSLEngine engine
      LocalVariableTable:
        Start  End  Slot                   Name  Signature
            0    1     0                 engine  Ljavax/net/ssl/SSLEngine;
            0    1     1                  alloc  Lio/netty/buffer/ByteBufAllocator;
            0    1     2  applicationNegotiator  Lio/netty/handler/ssl/JdkApplicationProtocolNegotiator;
    MethodParameters:
                       Name  Flags
      engine                 
      alloc                  
      applicationNegotiator  

  private void <init>(javax.net.ssl.SSLEngine, io.netty.buffer.ByteBufAllocator, java.util.List<java.lang.String>);
    descriptor: (Ljavax/net/ssl/SSLEngine;Lio/netty/buffer/ByteBufAllocator;Ljava/util/List;)V
    flags: (0x0002) ACC_PRIVATE
    Code:
      stack=4, locals=4, args_size=4
        start local 0 // io.netty.handler.ssl.ConscryptAlpnSslEngine this
        start local 1 // javax.net.ssl.SSLEngine engine
        start local 2 // io.netty.buffer.ByteBufAllocator alloc
        start local 3 // java.util.List protocols
         0: .line 58
            aload 0 /* this */
            aload 1 /* engine */
            invokespecial io.netty.handler.ssl.JdkSslEngine.<init>:(Ljavax/net/ssl/SSLEngine;)V
         1: .line 69
            getstatic io.netty.handler.ssl.ConscryptAlpnSslEngine.USE_BUFFER_ALLOCATOR:Z
            ifeq 3
         2: .line 70
            aload 1 /* engine */
            new io.netty.handler.ssl.ConscryptAlpnSslEngine$BufferAllocatorAdapter
            dup
            aload 2 /* alloc */
            invokespecial io.netty.handler.ssl.ConscryptAlpnSslEngine$BufferAllocatorAdapter.<init>:(Lio/netty/buffer/ByteBufAllocator;)V
            invokestatic org.conscrypt.Conscrypt.setBufferAllocator:(Ljavax/net/ssl/SSLEngine;Lorg/conscrypt/BufferAllocator;)V
         3: .line 74
      StackMap locals: io.netty.handler.ssl.ConscryptAlpnSslEngine javax.net.ssl.SSLEngine io.netty.buffer.ByteBufAllocator java.util.List
      StackMap stack:
            aload 1 /* engine */
            aload 3 /* protocols */
            aload 3 /* protocols */
            invokeinterface java.util.List.size:()I
            anewarray java.lang.String
            invokeinterface java.util.List.toArray:([Ljava/lang/Object;)[Ljava/lang/Object;
            checkcast java.lang.String[]
            invokestatic org.conscrypt.Conscrypt.setApplicationProtocols:(Ljavax/net/ssl/SSLEngine;[Ljava/lang/String;)V
         4: .line 75
            return
        end local 3 // java.util.List protocols
        end local 2 // io.netty.buffer.ByteBufAllocator alloc
        end local 1 // javax.net.ssl.SSLEngine engine
        end local 0 // io.netty.handler.ssl.ConscryptAlpnSslEngine this
      LocalVariableTable:
        Start  End  Slot       Name  Signature
            0    5     0       this  Lio/netty/handler/ssl/ConscryptAlpnSslEngine;
            0    5     1     engine  Ljavax/net/ssl/SSLEngine;
            0    5     2      alloc  Lio/netty/buffer/ByteBufAllocator;
            0    5     3  protocols  Ljava/util/List<Ljava/lang/String;>;
    Signature: (Ljavax/net/ssl/SSLEngine;Lio/netty/buffer/ByteBufAllocator;Ljava/util/List<Ljava/lang/String;>;)V
    MethodParameters:
           Name  Flags
      engine     
      alloc      
      protocols  

  final int calculateOutNetBufSize(int, int);
    descriptor: (II)I
    flags: (0x0010) ACC_FINAL
    Code:
      stack=6, locals=5, args_size=3
        start local 0 // io.netty.handler.ssl.ConscryptAlpnSslEngine this
        start local 1 // int plaintextBytes
        start local 2 // int numBuffers
         0: .line 87
            aload 0 /* this */
            invokevirtual io.netty.handler.ssl.ConscryptAlpnSslEngine.getWrappedEngine:()Ljavax/net/ssl/SSLEngine;
            invokestatic org.conscrypt.Conscrypt.maxSealOverhead:(Ljavax/net/ssl/SSLEngine;)I
            i2l
            iload 2 /* numBuffers */
            i2l
            lmul
            lstore 3 /* maxOverhead */
        start local 3 // long maxOverhead
         1: .line 89
            ldc 2147483647
            iload 1 /* plaintextBytes */
            i2l
            lload 3 /* maxOverhead */
            ladd
            invokestatic java.lang.Math.min:(JJ)J
            l2i
            ireturn
        end local 3 // long maxOverhead
        end local 2 // int numBuffers
        end local 1 // int plaintextBytes
        end local 0 // io.netty.handler.ssl.ConscryptAlpnSslEngine this
      LocalVariableTable:
        Start  End  Slot            Name  Signature
            0    2     0            this  Lio/netty/handler/ssl/ConscryptAlpnSslEngine;
            0    2     1  plaintextBytes  I
            0    2     2      numBuffers  I
            1    2     3     maxOverhead  J
    MethodParameters:
                Name  Flags
      plaintextBytes  
      numBuffers      

  final javax.net.ssl.SSLEngineResult unwrap(java.nio.ByteBuffer[], java.nio.ByteBuffer[]);
    descriptor: ([Ljava/nio/ByteBuffer;[Ljava/nio/ByteBuffer;)Ljavax/net/ssl/SSLEngineResult;
    flags: (0x0010) ACC_FINAL
    Code:
      stack=3, locals=3, args_size=3
        start local 0 // io.netty.handler.ssl.ConscryptAlpnSslEngine this
        start local 1 // java.nio.ByteBuffer[] srcs
        start local 2 // java.nio.ByteBuffer[] dests
         0: .line 93
            aload 0 /* this */
            invokevirtual io.netty.handler.ssl.ConscryptAlpnSslEngine.getWrappedEngine:()Ljavax/net/ssl/SSLEngine;
            aload 1 /* srcs */
            aload 2 /* dests */
            invokestatic org.conscrypt.Conscrypt.unwrap:(Ljavax/net/ssl/SSLEngine;[Ljava/nio/ByteBuffer;[Ljava/nio/ByteBuffer;)Ljavax/net/ssl/SSLEngineResult;
            areturn
        end local 2 // java.nio.ByteBuffer[] dests
        end local 1 // java.nio.ByteBuffer[] srcs
        end local 0 // io.netty.handler.ssl.ConscryptAlpnSslEngine this
      LocalVariableTable:
        Start  End  Slot   Name  Signature
            0    1     0   this  Lio/netty/handler/ssl/ConscryptAlpnSslEngine;
            0    1     1   srcs  [Ljava/nio/ByteBuffer;
            0    1     2  dests  [Ljava/nio/ByteBuffer;
    Exceptions:
      throws javax.net.ssl.SSLException
    MethodParameters:
       Name  Flags
      srcs   
      dests  
}
SourceFile: "ConscryptAlpnSslEngine.java"
NestMembers:
  io.netty.handler.ssl.ConscryptAlpnSslEngine$BufferAdapter  io.netty.handler.ssl.ConscryptAlpnSslEngine$BufferAllocatorAdapter  io.netty.handler.ssl.ConscryptAlpnSslEngine$ClientEngine  io.netty.handler.ssl.ConscryptAlpnSslEngine$ClientEngine$1  io.netty.handler.ssl.ConscryptAlpnSslEngine$ServerEngine  io.netty.handler.ssl.ConscryptAlpnSslEngine$ServerEngine$1
InnerClasses:
  private final BufferAdapter = io.netty.handler.ssl.ConscryptAlpnSslEngine$BufferAdapter of io.netty.handler.ssl.ConscryptAlpnSslEngine
  private final BufferAllocatorAdapter = io.netty.handler.ssl.ConscryptAlpnSslEngine$BufferAllocatorAdapter of io.netty.handler.ssl.ConscryptAlpnSslEngine
  private final ClientEngine = io.netty.handler.ssl.ConscryptAlpnSslEngine$ClientEngine of io.netty.handler.ssl.ConscryptAlpnSslEngine
  private final ServerEngine = io.netty.handler.ssl.ConscryptAlpnSslEngine$ServerEngine of io.netty.handler.ssl.ConscryptAlpnSslEngine