Module java.base
Package java.nio.channels

Interface NetworkChannel

All Superinterfaces:
AutoCloseable, Channel, Closeable
All Known Subinterfaces:
MulticastChannel
All Known Implementing Classes:
AsynchronousServerSocketChannel, AsynchronousSocketChannel, DatagramChannel, ServerSocketChannel, SocketChannel
public interface NetworkChannel extends Channel
A channel to a network socket.

A channel that implements this interface is a channel to a network socket. The bind method is used to bind the socket to a local address, the getLocalAddress method returns the address that the socket is bound to, and the setOption and getOption methods are used to set and query socket options. An implementation of this interface should specify the socket options that it supports.

The bind and setOption methods that do not otherwise have a value to return are specified to return the network channel upon which they are invoked. This allows method invocations to be chained. Implementations of this interface should specialize the return type so that method invocations on the implementation class can be chained.

Since:
1.7

  • Method Details

    • bind

      NetworkChannel bind​(SocketAddress local) throws IOException
      Binds the channel's socket to a local address.

      This method is used to establish an association between the socket and a local address. Once an association is established then the socket remains bound until the channel is closed. If the local parameter has the value null then the socket will be bound to an address that is assigned automatically.

      Parameters:
      local - The address to bind the socket, or null to bind the socket to an automatically assigned socket address
      Returns:
      This channel
      Throws:
      AlreadyBoundException - If the socket is already bound
      UnsupportedAddressTypeException - If the type of the given address is not supported
      ClosedChannelException - If the channel is closed
      IOException - If some other I/O error occurs
      SecurityException - If a security manager is installed and it denies an unspecified permission. An implementation of this interface should specify any required permissions.
      See Also:
      getLocalAddress()

    • getLocalAddress

      SocketAddress getLocalAddress() throws IOException
      Returns the socket address that this channel's socket is bound to.

      Where the channel is bound to an Internet Protocol socket address then the return value from this method is of type InetSocketAddress.

      Returns:
      The socket address that the socket is bound to, or null if the channel's socket is not bound
      Throws:
      ClosedChannelException - If the channel is closed
      IOException - If an I/O error occurs

    • setOption

      <T> NetworkChannel setOption​(SocketOption<T> name, T value) throws IOException
      Sets the value of a socket option.
      Type Parameters:
      T - The type of the socket option value
      Parameters:
      name - The socket option
      value - The value of the socket option. A value of null may be a valid value for some socket options.
      Returns:
      This channel
      Throws:
      UnsupportedOperationException - If the socket option is not supported by this channel
      IllegalArgumentException - If the value is not a valid value for this socket option
      ClosedChannelException - If this channel is closed
      IOException - If an I/O error occurs
      See Also:
      StandardSocketOptions

    • getOption

      <T> T getOption​(SocketOption<T> name) throws IOException
      Returns the value of a socket option.
      Type Parameters:
      T - The type of the socket option value
      Parameters:
      name - The socket option
      Returns:
      The value of the socket option. A value of null may be a valid value for some socket options.
      Throws:
      UnsupportedOperationException - If the socket option is not supported by this channel
      ClosedChannelException - If this channel is closed
      IOException - If an I/O error occurs
      See Also:
      StandardSocketOptions

    • supportedOptions

      Set<SocketOption<?>> supportedOptions()
      Returns a set of the socket options supported by this channel.

      This method will continue to return the set of options even after the channel has been closed.

      Returns:
      A set of the socket options supported by this channel