https://openjdk.java.net/ 
/*
 * Copyright (c) 2007, 2013, Oracle and/or its affiliates. All rights reserved.
 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
 *
 * This code is free software; you can redistribute it and/or modify it
 * under the terms of the GNU General Public License version 2 only, as
 * published by the Free Software Foundation.  Oracle designates this
 * particular file as subject to the "Classpath" exception as provided
 * by Oracle in the LICENSE file that accompanied this code.
 *
 * This code is distributed in the hope that it will be useful, but WITHOUT
 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
 * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License
 * version 2 for more details (a copy is included in the LICENSE file that
 * accompanied this code).
 *
 * You should have received a copy of the GNU General Public License version
 * 2 along with this work; if not, write to the Free Software Foundation,
 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
 *
 * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
 * or visit www.oracle.com if you need additional information or have any
 * questions.
 */

package java.nio.channels;

import java.net.SocketOption;
import java.net.SocketAddress;
import java.util.Set;
import java.io.IOException;


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
/**
 * A channel to a network socket.
 *
 * <p> A channel that implements this interface is a channel to a network
 * socket. The {@link #bind(SocketAddress) bind} method is used to bind the
 * socket to a local {@link SocketAddress address}, the {@link #getLocalAddress()
 * getLocalAddress} method returns the address that the socket is bound to, and
 * the {@link #setOption(SocketOption,Object) setOption} and {@link
 * #getOption(SocketOption) getOption} methods are used to set and query socket
 * options.  An implementation of this interface should specify the socket options
 * that it supports.
 *
 * <p> The {@link #bind bind} and {@link #setOption 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
 */

public interface NetworkChannel
    extends Channel
{
    
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. 
Params:
  • local –  The address to bind the socket, or null to bind the socket to an automatically assigned socket address
Throws:
See Also:
Returns: This channel
/**
     * Binds the channel's socket to a local address.
     *
     * <p> 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 {@code local} parameter has the
     * value {@code null} then the socket will be bound to an address that is
     * assigned automatically.
     *
     * @param   local
     *          The address to bind the socket, or {@code null} to bind the socket
     *          to an automatically assigned socket address
     *
     * @return  This channel
     *
     * @throws  AlreadyBoundException
     *          If the socket is already bound
     * @throws  UnsupportedAddressTypeException
     *          If the type of the given address is not supported
     * @throws  ClosedChannelException
     *          If the channel is closed
     * @throws  IOException
     *          If some other I/O error occurs
     * @throws  SecurityException
     *          If a security manager is installed and it denies an unspecified
     *          permission. An implementation of this interface should specify
     *          any required permissions.
     *
     * @see #getLocalAddress
     */
    NetworkChannel bind(SocketAddress local) 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. 
Throws:
Returns: The socket address that the socket is bound to, or null if the channel's socket is not bound
/**
     * Returns the socket address that this channel's socket is bound to.
     *
     * <p> Where the channel is {@link #bind bound} to an Internet Protocol
     * socket address then the return value from this method is of type {@link
     * java.net.InetSocketAddress}.
     *
     * @return  The socket address that the socket is bound to, or {@code null}
     *          if the channel's socket is not bound
     *
     * @throws  ClosedChannelException
     *          If the channel is closed
     * @throws  IOException
     *          If an I/O error occurs
     */
    SocketAddress getLocalAddress() throws IOException;

    
Sets the value of a socket option.

Params:
  • name – 
         The socket option
  • value –  The value of the socket option. A value of null may be a valid value for some socket options.
Type parameters:
  • <T> – 
         The type of the socket option value
Throws:
See Also:
Returns: This channel
/**
     * Sets the value of a socket option.
     *
     * @param   <T>
     *          The type of the socket option value
     * @param   name
     *          The socket option
     * @param   value
     *          The value of the socket option. A value of {@code null} may be
     *          a valid value for some socket options.
     *
     * @return  This channel
     *
     * @throws  UnsupportedOperationException
     *          If the socket option is not supported by this channel
     * @throws  IllegalArgumentException
     *          If the value is not a valid value for this socket option
     * @throws  ClosedChannelException
     *          If this channel is closed
     * @throws  IOException
     *          If an I/O error occurs
     *
     * @see java.net.StandardSocketOptions
     */
    <T> NetworkChannel setOption(SocketOption<T> name, T value) throws IOException;

    
Returns the value of a socket option.

Params:
  • name – 
         The socket option
Type parameters:
  • <T> – 
         The type of the socket option value
Throws:
See Also:
Returns: The value of the socket option. A value of null may be a valid value for some socket options.
/**
     * Returns the value of a socket option.
     *
     * @param   <T>
     *          The type of the socket option value
     * @param   name
     *          The socket option
     *
     * @return  The value of the socket option. A value of {@code null} may be
     *          a valid value for some socket options.
     *
     * @throws  UnsupportedOperationException
     *          If the socket option is not supported by this channel
     * @throws  ClosedChannelException
     *          If this channel is closed
     * @throws  IOException
     *          If an I/O error occurs
     *
     * @see java.net.StandardSocketOptions
     */
    <T> T getOption(SocketOption<T> name) throws IOException;

    
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
/**
     * Returns a set of the socket options supported by this channel.
     *
     * <p> This method will continue to return the set of options even after the
     * channel has been closed.
     *
     * @return  A set of the socket options supported by this channel
     */
    Set<SocketOption<?>> supportedOptions();
}