All Superinterfaces:

ReadStream<Buffer>, StreamBase, WriteStream<Buffer>
```
public interface NetSocket
extends ReadStream<Buffer>, WriteStream<Buffer>
```
Represents a socket-like interface to a TCP connection on either the client or the server side.
Instances of this class are created on the client side by an NetClient when a connection to a server is made, or on the server side by a NetServer when a server accepts a connection.
It implements both ReadStream and WriteStream so it can be used with Pipe to pipe data with flow control.

Author:

Tim Fox

Method Summary

All Methods Instance Methods Abstract Methods Default Methods
Modifier and Type	Method	Description
`String`	`applicationLayerProtocol()`
`Future<Void>`	`close()`	Close the socket
`NetSocket`	`closeHandler(Handler<Void> handler)`	Set a `handler` notified when the socket is closed
`NetSocket`	`drainHandler(Handler<Void> handler)`	Set a drain handler on the stream.
`Future<Void>`	`end()`	Calls `close()`
`NetSocket`	`endHandler(Handler<Void> endHandler)`	Set an end handler.
`NetSocket`	`exceptionHandler(Handler<Throwable> handler)`	Set an exception handler on the read stream.
`NetSocket`	`fetch(long amount)`	Fetch the specified `amount` of elements.
`NetSocket`	`handler(Handler<Buffer> handler)`	Set a data handler.
`String`	`indicatedServerName()`	Returns the SNI server name presented during the SSL handshake by the client.
`boolean`	`isSsl()`
`SocketAddress`	`localAddress()`
`SocketAddress`	`localAddress(boolean real)`	Like `localAddress()` ()} but returns the server local address when `real` is `true`
`NetSocket`	`pause()`	Pause the `ReadStream`, it sets the buffer in `fetch` mode and clears the actual demand.
`List<Certificate>`	`peerCertificates()`
`SocketAddress`	`remoteAddress()`
`SocketAddress`	`remoteAddress(boolean real)`	Like `remoteAddress()` but returns the proxy remote address when `real` is `true`
`NetSocket`	`resume()`	Resume reading, and sets the buffer in `flowing` mode.
`default Future<Void>`	`sendFile(String filename)`	Tell the operating system to stream a file as specified by `filename` directly from disk to the outgoing connection, bypassing userspace altogether (where supported by the underlying operating system.
`default Future<Void>`	`sendFile(String filename, long offset)`	Tell the operating system to stream a file as specified by `filename` directly from disk to the outgoing connection, bypassing userspace altogether (where supported by the underlying operating system.
`Future<Void>`	`sendFile(String filename, long offset, long length)`	Tell the operating system to stream a file as specified by `filename` directly from disk to the outgoing connection, bypassing userspace altogether (where supported by the underlying operating system.
`NetSocket`	`setWriteQueueMaxSize(int maxSize)`	Set the maximum size of the write queue to `maxSize`.
`NetSocket`	`shutdownHandler(Handler<Void> handler)`	Set a `handler` notified when the socket is shutdown: the client or server will close the connection within a certain amount of time.
`SSLSession`	`sslSession()`
`default Future<Void>`	`upgradeToSsl()`	Like `upgradeToSsl(SSLOptions, String, Buffer)` with the default SSL options, without indicating a server name, without an upgrade message.
`default Future<Void>`	`upgradeToSsl(Buffer msg)`	Like `upgradeToSsl(SSLOptions, String, Buffer)` with the default SSL options and without indicating a server name.
`default Future<Void>`	`upgradeToSsl(SSLOptions sslOptions)`	Upgrade channel to use SSL/TLS.
`default Future<Void>`	`upgradeToSsl(SSLOptions sslOptions, Buffer msg)`	Like `upgradeToSsl(SSLOptions, String, Buffer)` without indicating a server name
`default Future<Void>`	`upgradeToSsl(SSLOptions sslOptions, String serverName)`	Like `upgradeToSsl(SSLOptions, String, Buffer)` without an upgrade message.
`Future<Void>`	`upgradeToSsl(SSLOptions sslOptions, String serverName, Buffer upgrade)`	Upgrade the channel to use SSL/TLS, in other words proceeds to the TLS handshake.
`default Future<Void>`	`upgradeToSsl(String serverName)`	Like `upgradeToSsl(SSLOptions, String, Buffer)` with the default SSL options and without an update message.
`default Future<Void>`	`upgradeToSsl(String serverName, Buffer msg)`	Like `upgradeToSsl(SSLOptions, String, Buffer)` with the default SSL options.
`Future<Void>`	`write(String str)`	Write a `String` to the connection, encoded in UTF-8.
`Future<Void>`	`write(String str, String enc)`	Write a `String` to the connection, encoded using the encoding `enc`.
`String`	`writeHandlerID()`	When a `NetSocket` is created, it may register an event handler with the event bus, the ID of that handler is given by `writeHandlerID`.

Methods inherited from interface io.vertx.core.streams.ReadStream
collect, pipe, pipeTo

Methods inherited from interface io.vertx.core.streams.WriteStream
end, write, writeQueueFull

- Method Detail
  - exceptionHandler
```
NetSocket exceptionHandler(Handler<Throwable> handler)
```
    Description copied from interface: ReadStream
    
    Set an exception handler on the read stream.
    
    Specified by:
    
    exceptionHandler in interface ReadStream<Buffer>
    
    Specified by:
    
    exceptionHandler in interface StreamBase
    
    Specified by:
    
    exceptionHandler in interface WriteStream<Buffer>
    
    Parameters:
    
    handler - the exception handler
    
    Returns:
    
    a reference to this, so the API can be used fluently
  - handler
```
NetSocket handler(Handler<Buffer> handler)
```
    Description copied from interface: ReadStream
    
    Set a data handler. As data is read, the handler will be called with the data.
    
    Specified by:
    
    handler in interface ReadStream<Buffer>
    
    Returns:
    
    a reference to this, so the API can be used fluently
  - pause
```
NetSocket pause()
```
    Description copied from interface: ReadStream
    
    Pause the ReadStream, it sets the buffer in fetch mode and clears the actual demand.
    While it's paused, no data will be sent to the data handler.
    
    Specified by:
    
    pause in interface ReadStream<Buffer>
    
    Returns:
    
    a reference to this, so the API can be used fluently
  - resume
```
NetSocket resume()
```
    Description copied from interface: ReadStream
    
    Resume reading, and sets the buffer in flowing mode.
    If the ReadStream has been paused, reading will recommence on it.
    
    Specified by:
    
    resume in interface ReadStream<Buffer>
    
    Returns:
    
    a reference to this, so the API can be used fluently
  - fetch
```
NetSocket fetch(long amount)
```
    Description copied from interface: ReadStream
    
    Fetch the specified amount of elements. If the ReadStream has been paused, reading will recommence with the specified amount of items, otherwise the specified amount will be added to the current stream demand.
    
    Specified by:
    
    fetch in interface ReadStream<Buffer>
    
    Returns:
    
    a reference to this, so the API can be used fluently
  - endHandler
```
NetSocket endHandler(Handler<Void> endHandler)
```
    Set an end handler. Once the stream has ended, and there is no more data to be read, this handler will be called.
    This handler might be called after the close handler when the socket is paused and there are still buffers to deliver.
    
    Specified by:
    
    endHandler in interface ReadStream<Buffer>
    
    Returns:
    
    a reference to this, so the API can be used fluently
  - setWriteQueueMaxSize
```
NetSocket setWriteQueueMaxSize(int maxSize)
```
    Description copied from interface: WriteStream
    
    Set the maximum size of the write queue to maxSize. You will still be able to write to the stream even if there is more than maxSize items in the write queue. This is used as an indicator by classes such as Pipe to provide flow control.
    The value is defined by the implementation of the stream, e.g in bytes for a NetSocket, etc...
    
    Specified by:
    
    setWriteQueueMaxSize in interface WriteStream<Buffer>
    
    Parameters:
    
    maxSize - the max size of the write stream
    
    Returns:
    
    a reference to this, so the API can be used fluently
  - drainHandler
```
NetSocket drainHandler(Handler<Void> handler)
```
    Description copied from interface: WriteStream
    
    Set a drain handler on the stream. If the write queue is full, then the handler will be called when the write queue is ready to accept buffers again. See Pipe for an example of this being used.
    The stream implementation defines when the drain handler, for example it could be when the queue size has been reduced to maxSize / 2.
    
    Specified by:
    
    drainHandler in interface WriteStream<Buffer>
    
    Parameters:
    
    handler - the handler
    
    Returns:
    
    a reference to this, so the API can be used fluently
  - writeHandlerID
```
String writeHandlerID()
```
    When a NetSocket is created, it may register an event handler with the event bus, the ID of that handler is given by writeHandlerID.
    By default, no handler is registered, the feature must be enabled via NetClientOptions.setRegisterWriteHandler(boolean) or NetServerOptions.setRegisterWriteHandler(boolean).
    Given this ID, a different event loop can send a buffer to that event handler using the event bus and that buffer will be received by this instance in its own event loop and written to the underlying connection. This allows you to write data to other connections which are owned by different event loops.
    
    Returns:
    
    the write handler ID
    
    See Also:
    
    NetClientOptions.setRegisterWriteHandler(boolean), NetServerOptions.setRegisterWriteHandler(boolean)
  - write
```
Future<Void> write(String str)
```
    Write a String to the connection, encoded in UTF-8.
    
    Parameters:
    
    str - the string to write
    
    Returns:
    
    a future result of the write
  - write
```
Future<Void> write(String str,
                   String enc)
```
    Write a String to the connection, encoded using the encoding enc.
    
    Parameters:
    
    str - the string to write
    
    enc - the encoding to use
    
    Returns:
    
    a future completed with the result
  - sendFile
```
default Future<Void> sendFile(String filename)
```
    Tell the operating system to stream a file as specified by filename directly from disk to the outgoing connection, bypassing userspace altogether (where supported by the underlying operating system. This is a very efficient way to stream files.
    
    Parameters:
    
    filename - file name of the file to send
    
    Returns:
    
    a future result of the send operation
  - sendFile
```
default Future<Void> sendFile(String filename,
                              long offset)
```
    Tell the operating system to stream a file as specified by filename directly from disk to the outgoing connection, bypassing userspace altogether (where supported by the underlying operating system. This is a very efficient way to stream files.
    
    Parameters:
    
    filename - file name of the file to send
    
    offset - offset
    
    Returns:
    
    a future result of the send operation
  - sendFile
```
Future<Void> sendFile(String filename,
                      long offset,
                      long length)
```
    Tell the operating system to stream a file as specified by filename directly from disk to the outgoing connection, bypassing userspace altogether (where supported by the underlying operating system. This is a very efficient way to stream files.
    
    Parameters:
    
    filename - file name of the file to send
    
    offset - offset
    
    length - length
    
    Returns:
    
    a future result of the send operation
  - remoteAddress
```
SocketAddress remoteAddress()
```
    Returns:
    
    the remote address for this connection, possibly null (e.g a server bound on a domain socket). If useProxyProtocol is set to true, the address returned will be of the actual connecting client.
  - remoteAddress
```
SocketAddress remoteAddress(boolean real)
```
    Like remoteAddress() but returns the proxy remote address when real is true
  - localAddress
```
SocketAddress localAddress()
```
    Returns:
    
    the local address for this connection, possibly null (e.g a server bound on a domain socket) If useProxyProtocol is set to true, the address returned will be of the proxy.
  - localAddress
```
SocketAddress localAddress(boolean real)
```
    Like localAddress() ()} but returns the server local address when real is true
  - end
```
Future<Void> end()
```
    Calls close()
    
    Specified by:
    
    end in interface WriteStream<Buffer>
    
    Returns:
    
    a future completed with the result
  - close
```
Future<Void> close()
```
    Close the socket
    
    Returns:
    
    a future completed with the result
  - closeHandler
```
NetSocket closeHandler(Handler<Void> handler)
```
    Set a handler notified when the socket is closed
    
    Parameters:
    
    handler - the handler
    
    Returns:
    
    a reference to this, so the API can be used fluently
  - shutdownHandler
```
NetSocket shutdownHandler(Handler<Void> handler)
```
    Set a handler notified when the socket is shutdown: the client or server will close the connection within a certain amount of time. This gives the opportunity to the handler to close the socket gracefully before the socket is closed.
    
    Parameters:
    
    handler - the handler notified
    
    Returns:
    
    a reference to this, so the API can be used fluently
  - upgradeToSsl
```
default Future<Void> upgradeToSsl()
```
    Like upgradeToSsl(SSLOptions, String, Buffer) with the default SSL options, without indicating a server name, without an upgrade message.
  - upgradeToSsl
```
default Future<Void> upgradeToSsl(Buffer msg)
```
    Like upgradeToSsl(SSLOptions, String, Buffer) with the default SSL options and without indicating a server name.
  - upgradeToSsl
```
default Future<Void> upgradeToSsl(String serverName)
```
    Like upgradeToSsl(SSLOptions, String, Buffer) with the default SSL options and without an update message.
  - upgradeToSsl
```
default Future<Void> upgradeToSsl(String serverName,
                                  Buffer msg)
```
    Like upgradeToSsl(SSLOptions, String, Buffer) with the default SSL options.
  - upgradeToSsl
```
default Future<Void> upgradeToSsl(SSLOptions sslOptions,
                                  String serverName)
```
    Like upgradeToSsl(SSLOptions, String, Buffer) without an upgrade message.
  - upgradeToSsl
```
default Future<Void> upgradeToSsl(SSLOptions sslOptions,
                                  Buffer msg)
```
    Like upgradeToSsl(SSLOptions, String, Buffer) without indicating a server name
  - upgradeToSsl
```
Future<Void> upgradeToSsl(SSLOptions sslOptions,
                          String serverName,
                          Buffer upgrade)
```
    Upgrade the channel to use SSL/TLS, in other words proceeds to the TLS handshake.
    
    The upgrade message will be sent after the socket is ready to proceed to the TLS handshake in order to avoid data races. In practice is usually send by a server when it sends a message to the client to proceed to the handshake, e.g. 250 STARTTLS for an SMTP server, it should be null on a client
    
    The server name is sent in the client handshake, it should be null on a server.
    
    Be aware that for this to work SSL must be configured.
    
    Parameters:
    
    sslOptions - the SSL options
    
    serverName - the server name
    
    upgrade - the upgrade message to send
    
    Returns:
    
    a future completed when the connection has been upgraded to SSL
  - upgradeToSsl
```
default Future<Void> upgradeToSsl(SSLOptions sslOptions)
```
    Upgrade channel to use SSL/TLS. Be aware that for this to work SSL must be configured.
    
    Parameters:
    
    sslOptions - the SSL options
    
    Returns:
    
    a future completed when the connection has been upgraded to SSL
  - isSsl
```
boolean isSsl()
```
    Returns:
    
    true if this NetSocket is encrypted via SSL/TLS.
  - sslSession
```
SSLSession sslSession()
```
    Returns:
    
    SSLSession associated with the underlying socket. Returns null if connection is not SSL.
    
    See Also:
    
    SSLSession
  - peerCertificates
```
List<Certificate> peerCertificates()
                            throws SSLPeerUnverifiedException
```
    Returns:
    
    an ordered list of the peer certificates. Returns null if connection is not SSL.
    
    Throws:
    
    SSLPeerUnverifiedException - SSL peer's identity has not been verified.
    
    See Also:
    
    SSLSession.getPeerCertificates(), sslSession()
  - indicatedServerName
```
String indicatedServerName()
```
    Returns the SNI server name presented during the SSL handshake by the client.
    
    Returns:
    
    the indicated server name
  - applicationLayerProtocol
```
String applicationLayerProtocol()
```
    Returns:
    
    the application-level protocol negotiated during the TLS handshake

Interface NetSocket

Method Summary

Methods inherited from interface io.vertx.core.streams.ReadStream

Methods inherited from interface io.vertx.core.streams.WriteStream

Method Detail

exceptionHandler

handler

pause

resume

fetch

endHandler

setWriteQueueMaxSize

drainHandler

writeHandlerID

write

write

sendFile

sendFile

sendFile

remoteAddress

remoteAddress

localAddress

localAddress

end

close

closeHandler

shutdownHandler

upgradeToSsl

upgradeToSsl

upgradeToSsl

upgradeToSsl

upgradeToSsl

upgradeToSsl

upgradeToSsl

upgradeToSsl

isSsl

sslSession

peerCertificates

indicatedServerName

applicationLayerProtocol