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.ssl.SniHandler extends io.netty.handler.ssl.AbstractSniHandler<io.netty.handler.ssl.SslContext>
  minor version: 0
  major version: 59
  flags: flags: (0x0021) ACC_PUBLIC, ACC_SUPER
  this_class: io.netty.handler.ssl.SniHandler
  super_class: io.netty.handler.ssl.AbstractSniHandler
{
  private static final io.netty.handler.ssl.SniHandler$Selection EMPTY_SELECTION;
    descriptor: Lio/netty/handler/ssl/SniHandler$Selection;
    flags: (0x001a) ACC_PRIVATE, ACC_STATIC, ACC_FINAL

  protected final io.netty.util.AsyncMapping<java.lang.String, io.netty.handler.ssl.SslContext> mapping;
    descriptor: Lio/netty/util/AsyncMapping;
    flags: (0x0014) ACC_PROTECTED, ACC_FINAL
    Signature: Lio/netty/util/AsyncMapping<Ljava/lang/String;Lio/netty/handler/ssl/SslContext;>;

  private volatile io.netty.handler.ssl.SniHandler$Selection selection;
    descriptor: Lio/netty/handler/ssl/SniHandler$Selection;
    flags: (0x0042) ACC_PRIVATE, ACC_VOLATILE

  static void <clinit>();
    descriptor: ()V
    flags: (0x0008) ACC_STATIC
    Code:
      stack=4, locals=0, args_size=0
         0: .line 37
            new io.netty.handler.ssl.SniHandler$Selection
            dup
            aconst_null
            aconst_null
            invokespecial io.netty.handler.ssl.SniHandler$Selection.<init>:(Lio/netty/handler/ssl/SslContext;Ljava/lang/String;)V
            putstatic io.netty.handler.ssl.SniHandler.EMPTY_SELECTION:Lio/netty/handler/ssl/SniHandler$Selection;
            return
      LocalVariableTable:
        Start  End  Slot  Name  Signature

  public void <init>(io.netty.util.Mapping<? super java.lang.String, ? extends io.netty.handler.ssl.SslContext>);
    descriptor: (Lio/netty/util/Mapping;)V
    flags: (0x0001) ACC_PUBLIC
    Code:
      stack=4, locals=2, args_size=2
        start local 0 // io.netty.handler.ssl.SniHandler this
        start local 1 // io.netty.util.Mapping mapping
         0: .line 50
            aload 0 /* this */
            new io.netty.handler.ssl.SniHandler$AsyncMappingAdapter
            dup
            aload 1 /* mapping */
            invokespecial io.netty.handler.ssl.SniHandler$AsyncMappingAdapter.<init>:(Lio/netty/util/Mapping;)V
            invokespecial io.netty.handler.ssl.SniHandler.<init>:(Lio/netty/util/AsyncMapping;)V
         1: .line 51
            return
        end local 1 // io.netty.util.Mapping mapping
        end local 0 // io.netty.handler.ssl.SniHandler this
      LocalVariableTable:
        Start  End  Slot     Name  Signature
            0    2     0     this  Lio/netty/handler/ssl/SniHandler;
            0    2     1  mapping  Lio/netty/util/Mapping<-Ljava/lang/String;+Lio/netty/handler/ssl/SslContext;>;
    Signature: (Lio/netty/util/Mapping<-Ljava/lang/String;+Lio/netty/handler/ssl/SslContext;>;)V
    MethodParameters:
         Name  Flags
      mapping  

  public void <init>(io.netty.util.DomainNameMapping<? extends io.netty.handler.ssl.SslContext>);
    descriptor: (Lio/netty/util/DomainNameMapping;)V
    flags: (0x0001) ACC_PUBLIC
    Code:
      stack=2, locals=2, args_size=2
        start local 0 // io.netty.handler.ssl.SniHandler this
        start local 1 // io.netty.util.DomainNameMapping mapping
         0: .line 60
            aload 0 /* this */
            aload 1 /* mapping */
            invokespecial io.netty.handler.ssl.SniHandler.<init>:(Lio/netty/util/Mapping;)V
         1: .line 61
            return
        end local 1 // io.netty.util.DomainNameMapping mapping
        end local 0 // io.netty.handler.ssl.SniHandler this
      LocalVariableTable:
        Start  End  Slot     Name  Signature
            0    2     0     this  Lio/netty/handler/ssl/SniHandler;
            0    2     1  mapping  Lio/netty/util/DomainNameMapping<+Lio/netty/handler/ssl/SslContext;>;
    Signature: (Lio/netty/util/DomainNameMapping<+Lio/netty/handler/ssl/SslContext;>;)V
    MethodParameters:
         Name  Flags
      mapping  

  public void <init>(io.netty.util.AsyncMapping<? super java.lang.String, ? extends io.netty.handler.ssl.SslContext>);
    descriptor: (Lio/netty/util/AsyncMapping;)V
    flags: (0x0001) ACC_PUBLIC
    Code:
      stack=3, locals=2, args_size=2
        start local 0 // io.netty.handler.ssl.SniHandler this
        start local 1 // io.netty.util.AsyncMapping mapping
         0: .line 70
            aload 0 /* this */
            invokespecial io.netty.handler.ssl.AbstractSniHandler.<init>:()V
         1: .line 41
            aload 0 /* this */
            getstatic io.netty.handler.ssl.SniHandler.EMPTY_SELECTION:Lio/netty/handler/ssl/SniHandler$Selection;
            putfield io.netty.handler.ssl.SniHandler.selection:Lio/netty/handler/ssl/SniHandler$Selection;
         2: .line 71
            aload 0 /* this */
            aload 1 /* mapping */
            ldc "mapping"
            invokestatic io.netty.util.internal.ObjectUtil.checkNotNull:(Ljava/lang/Object;Ljava/lang/String;)Ljava/lang/Object;
            checkcast io.netty.util.AsyncMapping
            putfield io.netty.handler.ssl.SniHandler.mapping:Lio/netty/util/AsyncMapping;
         3: .line 72
            return
        end local 1 // io.netty.util.AsyncMapping mapping
        end local 0 // io.netty.handler.ssl.SniHandler this
      LocalVariableTable:
        Start  End  Slot     Name  Signature
            0    4     0     this  Lio/netty/handler/ssl/SniHandler;
            0    4     1  mapping  Lio/netty/util/AsyncMapping<-Ljava/lang/String;+Lio/netty/handler/ssl/SslContext;>;
    Signature: (Lio/netty/util/AsyncMapping<-Ljava/lang/String;+Lio/netty/handler/ssl/SslContext;>;)V
    MethodParameters:
         Name  Flags
      mapping  

  public java.lang.String hostname();
    descriptor: ()Ljava/lang/String;
    flags: (0x0001) ACC_PUBLIC
    Code:
      stack=1, locals=1, args_size=1
        start local 0 // io.netty.handler.ssl.SniHandler this
         0: .line 78
            aload 0 /* this */
            getfield io.netty.handler.ssl.SniHandler.selection:Lio/netty/handler/ssl/SniHandler$Selection;
            getfield io.netty.handler.ssl.SniHandler$Selection.hostname:Ljava/lang/String;
            areturn
        end local 0 // io.netty.handler.ssl.SniHandler this
      LocalVariableTable:
        Start  End  Slot  Name  Signature
            0    1     0  this  Lio/netty/handler/ssl/SniHandler;

  public io.netty.handler.ssl.SslContext sslContext();
    descriptor: ()Lio/netty/handler/ssl/SslContext;
    flags: (0x0001) ACC_PUBLIC
    Code:
      stack=1, locals=1, args_size=1
        start local 0 // io.netty.handler.ssl.SniHandler this
         0: .line 85
            aload 0 /* this */
            getfield io.netty.handler.ssl.SniHandler.selection:Lio/netty/handler/ssl/SniHandler$Selection;
            getfield io.netty.handler.ssl.SniHandler$Selection.context:Lio/netty/handler/ssl/SslContext;
            areturn
        end local 0 // io.netty.handler.ssl.SniHandler this
      LocalVariableTable:
        Start  End  Slot  Name  Signature
            0    1     0  this  Lio/netty/handler/ssl/SniHandler;

  protected io.netty.util.concurrent.Future<io.netty.handler.ssl.SslContext> lookup(io.netty.channel.ChannelHandlerContext, java.lang.String);
    descriptor: (Lio/netty/channel/ChannelHandlerContext;Ljava/lang/String;)Lio/netty/util/concurrent/Future;
    flags: (0x0004) ACC_PROTECTED
    Code:
      stack=3, locals=3, args_size=3
        start local 0 // io.netty.handler.ssl.SniHandler this
        start local 1 // io.netty.channel.ChannelHandlerContext ctx
        start local 2 // java.lang.String hostname
         0: .line 96
            aload 0 /* this */
            getfield io.netty.handler.ssl.SniHandler.mapping:Lio/netty/util/AsyncMapping;
            aload 2 /* hostname */
            aload 1 /* ctx */
            invokeinterface io.netty.channel.ChannelHandlerContext.executor:()Lio/netty/util/concurrent/EventExecutor;
            invokeinterface io.netty.util.concurrent.EventExecutor.newPromise:()Lio/netty/util/concurrent/Promise;
            invokeinterface io.netty.util.AsyncMapping.map:(Ljava/lang/Object;Lio/netty/util/concurrent/Promise;)Lio/netty/util/concurrent/Future;
            areturn
        end local 2 // java.lang.String hostname
        end local 1 // io.netty.channel.ChannelHandlerContext ctx
        end local 0 // io.netty.handler.ssl.SniHandler this
      LocalVariableTable:
        Start  End  Slot      Name  Signature
            0    1     0      this  Lio/netty/handler/ssl/SniHandler;
            0    1     1       ctx  Lio/netty/channel/ChannelHandlerContext;
            0    1     2  hostname  Ljava/lang/String;
    Exceptions:
      throws java.lang.Exception
    Signature: (Lio/netty/channel/ChannelHandlerContext;Ljava/lang/String;)Lio/netty/util/concurrent/Future<Lio/netty/handler/ssl/SslContext;>;
    MethodParameters:
          Name  Flags
      ctx       
      hostname  

  protected final void onLookupComplete(io.netty.channel.ChannelHandlerContext, java.lang.String, io.netty.util.concurrent.Future<io.netty.handler.ssl.SslContext>);
    descriptor: (Lio/netty/channel/ChannelHandlerContext;Ljava/lang/String;Lio/netty/util/concurrent/Future;)V
    flags: (0x0014) ACC_PROTECTED, ACC_FINAL
    Code:
      stack=5, locals=6, args_size=4
        start local 0 // io.netty.handler.ssl.SniHandler this
        start local 1 // io.netty.channel.ChannelHandlerContext ctx
        start local 2 // java.lang.String hostname
        start local 3 // io.netty.util.concurrent.Future future
         0: .line 102
            aload 3 /* future */
            invokeinterface io.netty.util.concurrent.Future.isSuccess:()Z
            ifne 5
         1: .line 103
            aload 3 /* future */
            invokeinterface io.netty.util.concurrent.Future.cause:()Ljava/lang/Throwable;
            astore 4 /* cause */
        start local 4 // java.lang.Throwable cause
         2: .line 104
            aload 4 /* cause */
            instanceof java.lang.Error
            ifeq 4
         3: .line 105
            aload 4 /* cause */
            checkcast java.lang.Error
            athrow
         4: .line 107
      StackMap locals: java.lang.Throwable
      StackMap stack:
            new io.netty.handler.codec.DecoderException
            dup
            new java.lang.StringBuilder
            dup
            ldc "failed to get the SslContext for "
            invokespecial java.lang.StringBuilder.<init>:(Ljava/lang/String;)V
            aload 2 /* hostname */
            invokevirtual java.lang.StringBuilder.append:(Ljava/lang/String;)Ljava/lang/StringBuilder;
            invokevirtual java.lang.StringBuilder.toString:()Ljava/lang/String;
            aload 4 /* cause */
            invokespecial io.netty.handler.codec.DecoderException.<init>:(Ljava/lang/String;Ljava/lang/Throwable;)V
            athrow
        end local 4 // java.lang.Throwable cause
         5: .line 110
      StackMap locals:
      StackMap stack:
            aload 3 /* future */
            invokeinterface io.netty.util.concurrent.Future.getNow:()Ljava/lang/Object;
            checkcast io.netty.handler.ssl.SslContext
            astore 4 /* sslContext */
        start local 4 // io.netty.handler.ssl.SslContext sslContext
         6: .line 111
            aload 0 /* this */
            new io.netty.handler.ssl.SniHandler$Selection
            dup
            aload 4 /* sslContext */
            aload 2 /* hostname */
            invokespecial io.netty.handler.ssl.SniHandler$Selection.<init>:(Lio/netty/handler/ssl/SslContext;Ljava/lang/String;)V
            putfield io.netty.handler.ssl.SniHandler.selection:Lio/netty/handler/ssl/SniHandler$Selection;
         7: .line 113
            aload 0 /* this */
            aload 1 /* ctx */
            aload 2 /* hostname */
            aload 4 /* sslContext */
            invokevirtual io.netty.handler.ssl.SniHandler.replaceHandler:(Lio/netty/channel/ChannelHandlerContext;Ljava/lang/String;Lio/netty/handler/ssl/SslContext;)V
         8: .line 114
            goto 12
      StackMap locals: io.netty.handler.ssl.SniHandler io.netty.channel.ChannelHandlerContext java.lang.String io.netty.util.concurrent.Future io.netty.handler.ssl.SslContext
      StackMap stack: java.lang.Throwable
         9: astore 5 /* cause */
        start local 5 // java.lang.Throwable cause
        10: .line 115
            aload 0 /* this */
            getstatic io.netty.handler.ssl.SniHandler.EMPTY_SELECTION:Lio/netty/handler/ssl/SniHandler$Selection;
            putfield io.netty.handler.ssl.SniHandler.selection:Lio/netty/handler/ssl/SniHandler$Selection;
        11: .line 116
            aload 5 /* cause */
            invokestatic io.netty.util.internal.PlatformDependent.throwException:(Ljava/lang/Throwable;)V
        end local 5 // java.lang.Throwable cause
        12: .line 118
      StackMap locals:
      StackMap stack:
            return
        end local 4 // io.netty.handler.ssl.SslContext sslContext
        end local 3 // io.netty.util.concurrent.Future future
        end local 2 // java.lang.String hostname
        end local 1 // io.netty.channel.ChannelHandlerContext ctx
        end local 0 // io.netty.handler.ssl.SniHandler this
      LocalVariableTable:
        Start  End  Slot        Name  Signature
            0   13     0        this  Lio/netty/handler/ssl/SniHandler;
            0   13     1         ctx  Lio/netty/channel/ChannelHandlerContext;
            0   13     2    hostname  Ljava/lang/String;
            0   13     3      future  Lio/netty/util/concurrent/Future<Lio/netty/handler/ssl/SslContext;>;
            2    5     4       cause  Ljava/lang/Throwable;
            6   13     4  sslContext  Lio/netty/handler/ssl/SslContext;
           10   12     5       cause  Ljava/lang/Throwable;
      Exception table:
        from    to  target  type
           7     8       9  Class java.lang.Throwable
    Exceptions:
      throws java.lang.Exception
    Signature: (Lio/netty/channel/ChannelHandlerContext;Ljava/lang/String;Lio/netty/util/concurrent/Future<Lio/netty/handler/ssl/SslContext;>;)V
    MethodParameters:
          Name  Flags
      ctx       
      hostname  
      future    

  protected void replaceHandler(io.netty.channel.ChannelHandlerContext, java.lang.String, io.netty.handler.ssl.SslContext);
    descriptor: (Lio/netty/channel/ChannelHandlerContext;Ljava/lang/String;Lio/netty/handler/ssl/SslContext;)V
    flags: (0x0004) ACC_PROTECTED
    Code:
      stack=4, locals=6, args_size=4
        start local 0 // io.netty.handler.ssl.SniHandler this
        start local 1 // io.netty.channel.ChannelHandlerContext ctx
        start local 2 // java.lang.String hostname
        start local 3 // io.netty.handler.ssl.SslContext sslContext
         0: .line 130
            aconst_null
            astore 4 /* sslHandler */
        start local 4 // io.netty.handler.ssl.SslHandler sslHandler
         1: .line 132
            aload 3 /* sslContext */
            aload 1 /* ctx */
            invokeinterface io.netty.channel.ChannelHandlerContext.alloc:()Lio/netty/buffer/ByteBufAllocator;
            invokevirtual io.netty.handler.ssl.SslContext.newHandler:(Lio/netty/buffer/ByteBufAllocator;)Lio/netty/handler/ssl/SslHandler;
            astore 4 /* sslHandler */
         2: .line 133
            aload 1 /* ctx */
            invokeinterface io.netty.channel.ChannelHandlerContext.pipeline:()Lio/netty/channel/ChannelPipeline;
            aload 0 /* this */
            ldc Lio/netty/handler/ssl/SslHandler;
            invokevirtual java.lang.Class.getName:()Ljava/lang/String;
            aload 4 /* sslHandler */
            invokeinterface io.netty.channel.ChannelPipeline.replace:(Lio/netty/channel/ChannelHandler;Ljava/lang/String;Lio/netty/channel/ChannelHandler;)Lio/netty/channel/ChannelPipeline;
            pop
         3: .line 134
            aconst_null
            astore 4 /* sslHandler */
         4: .line 135
            goto 9
      StackMap locals: io.netty.handler.ssl.SniHandler io.netty.channel.ChannelHandlerContext java.lang.String io.netty.handler.ssl.SslContext io.netty.handler.ssl.SslHandler
      StackMap stack: java.lang.Throwable
         5: astore 5
         6: .line 139
            aload 4 /* sslHandler */
            ifnull 8
         7: .line 140
            aload 4 /* sslHandler */
            invokevirtual io.netty.handler.ssl.SslHandler.engine:()Ljavax/net/ssl/SSLEngine;
            invokestatic io.netty.util.ReferenceCountUtil.safeRelease:(Ljava/lang/Object;)V
         8: .line 142
      StackMap locals: java.lang.Throwable
      StackMap stack:
            aload 5
            athrow
         9: .line 139
      StackMap locals:
      StackMap stack:
            aload 4 /* sslHandler */
            ifnull 11
        10: .line 140
            aload 4 /* sslHandler */
            invokevirtual io.netty.handler.ssl.SslHandler.engine:()Ljavax/net/ssl/SSLEngine;
            invokestatic io.netty.util.ReferenceCountUtil.safeRelease:(Ljava/lang/Object;)V
        11: .line 143
      StackMap locals:
      StackMap stack:
            return
        end local 4 // io.netty.handler.ssl.SslHandler sslHandler
        end local 3 // io.netty.handler.ssl.SslContext sslContext
        end local 2 // java.lang.String hostname
        end local 1 // io.netty.channel.ChannelHandlerContext ctx
        end local 0 // io.netty.handler.ssl.SniHandler this
      LocalVariableTable:
        Start  End  Slot        Name  Signature
            0   12     0        this  Lio/netty/handler/ssl/SniHandler;
            0   12     1         ctx  Lio/netty/channel/ChannelHandlerContext;
            0   12     2    hostname  Ljava/lang/String;
            0   12     3  sslContext  Lio/netty/handler/ssl/SslContext;
            1   12     4  sslHandler  Lio/netty/handler/ssl/SslHandler;
      Exception table:
        from    to  target  type
           1     5       5  any
    Exceptions:
      throws java.lang.Exception
    MethodParameters:
            Name  Flags
      ctx         
      hostname    
      sslContext  
}
Signature: Lio/netty/handler/ssl/AbstractSniHandler<Lio/netty/handler/ssl/SslContext;>;
SourceFile: "SniHandler.java"
NestMembers:
  io.netty.handler.ssl.SniHandler$AsyncMappingAdapter  io.netty.handler.ssl.SniHandler$Selection
InnerClasses:
  private final AsyncMappingAdapter = io.netty.handler.ssl.SniHandler$AsyncMappingAdapter of io.netty.handler.ssl.SniHandler
  private final Selection = io.netty.handler.ssl.SniHandler$Selection of io.netty.handler.ssl.SniHandler