Nio2Channel (Apache Tomcat 11.0.21 API Documentation)
Description: declaration: package: org.apache.tomcat.util.net, class: Nio2Channel

# Class Nio2Channel

java.lang.Object
org.apache.tomcat.util.net.Nio2Channel

All Implemented Interfaces:
  `Closeable, AutoCloseable, AsynchronousByteChannel, AsynchronousChannel, Channel`

Direct Known Subclasses:
  `SecureNio2Channel`

public class Nio2Channel extends Object implements AsynchronousByteChannel
Base class for a SocketChannel wrapper used by the endpoint. This way, logic for an SSL socket channel remains the same as for a non SSL, making sure we don't need to code for any exception cases.

- ## Field Summary

  Fields
  Modifier and Type
  Field
  Description
  `protected final SocketBufferHandler`
  `bufHandler`
  `protected static final ByteBuffer`
  `emptyBuf`
  `protected AsynchronousSocketChannel`
  `sc`
  `protected SocketWrapperBase<Nio2Channel>`
  `socketWrapper`

- ## Constructor Summary

  Constructors
  Constructor
  Description
  `Nio2Channel(SocketBufferHandler bufHandler)`

- ## Method Summary

  Modifier and Type
  Method
  Description
  `void`
  `close()`
  Closes this channel.
  `void`
  `close(boolean force)`
  Close the connection.
  `Future<Boolean>`
  `flush()`
  `void`
  `free()`
  Free the channel memory
  `protected ApplicationBufferHandler`
  `getAppReadBufHandler()`
  `SocketBufferHandler`
  `getBufHandler()`
  `AsynchronousSocketChannel`
  `getIOChannel()`
  `int`
  `handshake()`
  Performs SSL handshake hence is a no-op for the non-secure implementation.
  `boolean`
  `isClosing()`
  `boolean`
  `isHandshakeComplete()`
  `boolean`
  `isOpen()`
  Tells whether or not this channel is open.
  `Future<Integer>`
  `read(ByteBuffer dst)`
  `<A> void`
  `read(ByteBuffer[] dsts, int offset, int length, long timeout, TimeUnit unit, A attachment, CompletionHandler<Long, ? super A> handler)`
  `<A> void`
  `read(ByteBuffer dst, long timeout, TimeUnit unit, A attachment, CompletionHandler<Integer, ? super A> handler)`
  `<A> void`
  `read(ByteBuffer dst, A attachment, CompletionHandler<Integer, ? super A> handler)`
  `void`
  `reset(AsynchronousSocketChannel channel, SocketWrapperBase<Nio2Channel> socketWrapper)`
  Reset the channel.
  `void`
  `setAppReadBufHandler(ApplicationBufferHandler handler)`
  `String`
  `toString()`
  `Future<Integer>`
  `write(ByteBuffer src)`
  `<A> void`
  `write(ByteBuffer[] srcs, int offset, int length, long timeout, TimeUnit unit, A attachment, CompletionHandler<Long, ? super A> handler)`
  `<A> void`
  `write(ByteBuffer src, long timeout, TimeUnit unit, A attachment, CompletionHandler<Integer, ? super A> handler)`
  `<A> void`
  `write(ByteBuffer src, A attachment, CompletionHandler<Integer, ? super A> handler)`

  ### Methods inherited from class Object

  `clone, equals, finalize, getClass, hashCode, notify, notifyAll, wait, wait, wait`

- ## Field Details

  - ### emptyBuf

    protected static final ByteBuffer emptyBuf

  - ### bufHandler

    protected final SocketBufferHandler bufHandler

  - ### sc

    protected AsynchronousSocketChannel sc

  - ### socketWrapper

    protected SocketWrapperBase<Nio2Channel> socketWrapper

- ## Constructor Details

  - ### Nio2Channel

    public Nio2Channel(SocketBufferHandler bufHandler)

- ## Method Details

  - ### reset

    public void reset(AsynchronousSocketChannel channel, SocketWrapperBase<Nio2Channel> socketWrapper) throws IOException
    Reset the channel.
    Parameters:
      `channel` - The new async channel to associate with this NIO2 channel
      `socketWrapper` - The new socket to associate with this NIO2 channel
    Throws:
      `IOException` - If a problem was encountered resetting the channel

  - ### free

    public void free()
    Free the channel memory

  - ### close

    public void close() throws IOException
    Closes this channel.
    Specified by:
      `close` in interface `AsynchronousChannel`
    Specified by:
      `close` in interface `AutoCloseable`
    Specified by:
      `close` in interface `Channel`
    Specified by:
      `close` in interface `Closeable`
    Throws:
      `IOException` - If an I/O error occurs

  - ### close

    public void close(boolean force) throws IOException
    Close the connection.
    Parameters:
      `force` - Should the underlying socket be forcibly closed?
    Throws:
      `IOException` - If closing the secure channel fails.

  - ### isOpen

    public boolean isOpen()
    Tells whether or not this channel is open.
    Specified by:
      `isOpen` in interface `Channel`
    Returns:
      `true` if, and only if, this channel is open

  - ### getBufHandler

    public SocketBufferHandler getBufHandler()

  - ### getIOChannel

    public AsynchronousSocketChannel getIOChannel()

  - ### isClosing

    public boolean isClosing()

  - ### isHandshakeComplete

    public boolean isHandshakeComplete()

  - ### handshake

    public int handshake() throws IOException
    Performs SSL handshake hence is a no-op for the non-secure implementation.
    Returns:
      Always returns zero
    Throws:
      `IOException` - Never for non-secure channel

  - ### toString

    public String toString()
    Overrides:
      `toString` in class `Object`

  - ### read

    public Future<Integer> read(ByteBuffer dst)
    Specified by:
      `read` in interface `AsynchronousByteChannel`

  - ### read

    public <A> void read(ByteBuffer dst, A attachment, CompletionHandler<Integer, ? super A> handler)
    Specified by:
      `read` in interface `AsynchronousByteChannel`

  - ### read

    public <A> void read(ByteBuffer dst, long timeout, TimeUnit unit, A attachment, CompletionHandler<Integer, ? super A> handler)

  - ### read

    public <A> void read(ByteBuffer[] dsts, int offset, int length, long timeout, TimeUnit unit, A attachment, CompletionHandler<Long, ? super A> handler)

  - ### write

    public Future<Integer> write(ByteBuffer src)
    Specified by:
      `write` in interface `AsynchronousByteChannel`

  - ### write

    public <A> void write(ByteBuffer src, A attachment, CompletionHandler<Integer, ? super A> handler)
    Specified by:
      `write` in interface `AsynchronousByteChannel`

  - ### write

    public <A> void write(ByteBuffer src, long timeout, TimeUnit unit, A attachment, CompletionHandler<Integer, ? super A> handler)

  - ### write

    public <A> void write(ByteBuffer[] srcs, int offset, int length, long timeout, TimeUnit unit, A attachment, CompletionHandler<Long, ? super A> handler)

  - ### flush

    public Future<Boolean> flush()

  - ### setAppReadBufHandler

    public void setAppReadBufHandler(ApplicationBufferHandler handler)

  - ### getAppReadBufHandler

    protected ApplicationBufferHandler getAppReadBufHandler()