author | alanb |
Fri, 28 Jun 2013 16:10:23 +0100 | |
changeset 18574 | 4aeaeb541678 |
parent 18274 | 7c4289125569 |
child 23010 | 6dadb192ad81 |
permissions | -rw-r--r-- |
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/* |
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* Copyright (c) 2007, 2011, Oracle and/or its affiliates. All rights reserved. |
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* DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER. |
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* |
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* This code is free software; you can redistribute it and/or modify it |
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* under the terms of the GNU General Public License version 2 only, as |
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* published by the Free Software Foundation. Oracle designates this |
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* particular file as subject to the "Classpath" exception as provided |
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* by Oracle in the LICENSE file that accompanied this code. |
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* |
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* This code is distributed in the hope that it will be useful, but WITHOUT |
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* ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or |
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* FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License |
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* version 2 for more details (a copy is included in the LICENSE file that |
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* accompanied this code). |
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* |
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* You should have received a copy of the GNU General Public License version |
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* 2 along with this work; if not, write to the Free Software Foundation, |
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* Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA. |
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* |
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* Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA |
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* or visit www.oracle.com if you need additional information or have any |
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* questions. |
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*/ |
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package java.nio.channels; |
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import java.nio.channels.spi.*; |
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import java.net.SocketOption; |
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import java.net.SocketAddress; |
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import java.util.concurrent.Future; |
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import java.io.IOException; |
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|
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/** |
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* An asynchronous channel for stream-oriented listening sockets. |
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* |
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* <p> An asynchronous server-socket channel is created by invoking the |
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* {@link #open open} method of this class. |
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* A newly-created asynchronous server-socket channel is open but not yet bound. |
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* It can be bound to a local address and configured to listen for connections |
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* by invoking the {@link #bind(SocketAddress,int) bind} method. Once bound, |
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* the {@link #accept(Object,CompletionHandler) accept} method |
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* is used to initiate the accepting of connections to the channel's socket. |
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* An attempt to invoke the <tt>accept</tt> method on an unbound channel will |
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* cause a {@link NotYetBoundException} to be thrown. |
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* |
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* <p> Channels of this type are safe for use by multiple concurrent threads |
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* though at most one accept operation can be outstanding at any time. |
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* If a thread initiates an accept operation before a previous accept operation |
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* has completed then an {@link AcceptPendingException} will be thrown. |
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* |
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* <p> Socket options are configured using the {@link #setOption(SocketOption,Object) |
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* setOption} method. Channels of this type support the following options: |
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* <blockquote> |
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* <table border summary="Socket options"> |
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* <tr> |
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* <th>Option Name</th> |
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* <th>Description</th> |
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* </tr> |
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* <tr> |
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* <td> {@link java.net.StandardSocketOptions#SO_RCVBUF SO_RCVBUF} </td> |
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* <td> The size of the socket receive buffer </td> |
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* </tr> |
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* <tr> |
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* <td> {@link java.net.StandardSocketOptions#SO_REUSEADDR SO_REUSEADDR} </td> |
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* <td> Re-use address </td> |
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* </tr> |
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* </table> |
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* </blockquote> |
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* Additional (implementation specific) options may also be supported. |
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* |
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* <p> <b>Usage Example:</b> |
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* <pre> |
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* final AsynchronousServerSocketChannel listener = |
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* AsynchronousServerSocketChannel.open().bind(new InetSocketAddress(5000)); |
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* |
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* listener.accept(null, new CompletionHandler<AsynchronousSocketChannel,Void>() { |
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* public void completed(AsynchronousSocketChannel ch, Void att) { |
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* // accept the next connection |
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* listener.accept(null, this); |
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* |
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* // handle this connection |
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* handle(ch); |
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* } |
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* public void failed(Throwable exc, Void att) { |
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* ... |
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* } |
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* }); |
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* </pre> |
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* |
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* @since 1.7 |
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*/ |
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public abstract class AsynchronousServerSocketChannel |
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implements AsynchronousChannel, NetworkChannel |
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{ |
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private final AsynchronousChannelProvider provider; |
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|
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/** |
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* Initializes a new instance of this class. |
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* |
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* @param provider |
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* The provider that created this channel |
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*/ |
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protected AsynchronousServerSocketChannel(AsynchronousChannelProvider provider) { |
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this.provider = provider; |
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} |
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/** |
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* Returns the provider that created this channel. |
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* |
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* @return The provider that created this channel |
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*/ |
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public final AsynchronousChannelProvider provider() { |
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return provider; |
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} |
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|
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/** |
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* Opens an asynchronous server-socket channel. |
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* |
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* <p> The new channel is created by invoking the {@link |
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* java.nio.channels.spi.AsynchronousChannelProvider#openAsynchronousServerSocketChannel |
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* openAsynchronousServerSocketChannel} method on the {@link |
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* java.nio.channels.spi.AsynchronousChannelProvider} object that created |
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* the given group. If the group parameter is <tt>null</tt> then the |
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* resulting channel is created by the system-wide default provider, and |
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* bound to the <em>default group</em>. |
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* |
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* @param group |
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* The group to which the newly constructed channel should be bound, |
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* or <tt>null</tt> for the default group |
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* |
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* @return A new asynchronous server socket channel |
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* |
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* @throws ShutdownChannelGroupException |
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* If the channel group is shutdown |
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* @throws IOException |
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* If an I/O error occurs |
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*/ |
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public static AsynchronousServerSocketChannel open(AsynchronousChannelGroup group) |
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throws IOException |
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{ |
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AsynchronousChannelProvider provider = (group == null) ? |
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AsynchronousChannelProvider.provider() : group.provider(); |
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return provider.openAsynchronousServerSocketChannel(group); |
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} |
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|
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/** |
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* Opens an asynchronous server-socket channel. |
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* |
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* <p> This method returns an asynchronous server socket channel that is |
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* bound to the <em>default group</em>. This method is equivalent to evaluating |
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* the expression: |
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* <blockquote><pre> |
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* open((AsynchronousChannelGroup)null); |
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* </pre></blockquote> |
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* |
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* @return A new asynchronous server socket channel |
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* |
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* @throws IOException |
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* If an I/O error occurs |
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*/ |
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public static AsynchronousServerSocketChannel open() |
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throws IOException |
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{ |
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return open(null); |
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} |
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168 |
|
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169 |
/** |
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* Binds the channel's socket to a local address and configures the socket to |
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* listen for connections. |
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* |
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* <p> An invocation of this method is equivalent to the following: |
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* <blockquote><pre> |
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* bind(local, 0); |
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* </pre></blockquote> |
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* |
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* @param local |
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* The local address to bind the socket, or <tt>null</tt> to bind |
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* to an automatically assigned socket address |
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* |
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* @return This channel |
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* |
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* @throws AlreadyBoundException {@inheritDoc} |
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* @throws UnsupportedAddressTypeException {@inheritDoc} |
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* @throws SecurityException {@inheritDoc} |
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* @throws ClosedChannelException {@inheritDoc} |
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* @throws IOException {@inheritDoc} |
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*/ |
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public final AsynchronousServerSocketChannel bind(SocketAddress local) |
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throws IOException |
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{ |
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return bind(local, 0); |
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} |
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195 |
|
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/** |
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* Binds the channel's socket to a local address and configures the socket to |
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* listen for connections. |
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* |
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* <p> This method is used to establish an association between the socket and |
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* a local address. Once an association is established then the socket remains |
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* bound until the associated channel is closed. |
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203 |
* |
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* <p> The {@code backlog} parameter is the maximum number of pending |
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* connections on the socket. Its exact semantics are implementation specific. |
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* In particular, an implementation may impose a maximum length or may choose |
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* to ignore the parameter altogther. If the {@code backlog} parameter has |
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* the value {@code 0}, or a negative value, then an implementation specific |
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* default is used. |
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* |
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* @param local |
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* The local address to bind the socket, or {@code null} to bind |
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* to an automatically assigned socket address |
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* @param backlog |
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* The maximum number of pending connections |
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* |
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* @return This channel |
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* |
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* @throws AlreadyBoundException |
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* If the socket is already bound |
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* @throws UnsupportedAddressTypeException |
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* If the type of the given address is not supported |
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* @throws SecurityException |
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* If a security manager has been installed and its {@link |
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* SecurityManager#checkListen checkListen} method denies the operation |
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* @throws ClosedChannelException |
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* If the channel is closed |
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* @throws IOException |
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* If some other I/O error occurs |
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*/ |
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public abstract AsynchronousServerSocketChannel bind(SocketAddress local, int backlog) |
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throws IOException; |
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|
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/** |
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* @throws IllegalArgumentException {@inheritDoc} |
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* @throws ClosedChannelException {@inheritDoc} |
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* @throws IOException {@inheritDoc} |
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*/ |
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public abstract <T> AsynchronousServerSocketChannel setOption(SocketOption<T> name, T value) |
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throws IOException; |
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|
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/** |
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* Accepts a connection. |
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* |
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* <p> This method initiates an asynchronous operation to accept a |
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* connection made to this channel's socket. The {@code handler} parameter is |
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* a completion handler that is invoked when a connection is accepted (or |
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* the operation fails). The result passed to the completion handler is |
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* the {@link AsynchronousSocketChannel} to the new connection. |
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* |
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* <p> When a new connection is accepted then the resulting {@code |
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* AsynchronousSocketChannel} will be bound to the same {@link |
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* AsynchronousChannelGroup} as this channel. If the group is {@link |
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* AsynchronousChannelGroup#isShutdown shutdown} and a connection is accepted, |
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* then the connection is closed, and the operation completes with an {@code |
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* IOException} and cause {@link ShutdownChannelGroupException}. |
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* |
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* <p> To allow for concurrent handling of new connections, the completion |
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* handler is not invoked directly by the initiating thread when a new |
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* connection is accepted immediately (see <a |
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* href="AsynchronousChannelGroup.html#threading">Threading</a>). |
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* |
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* <p> If a security manager has been installed then it verifies that the |
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* address and port number of the connection's remote endpoint are permitted |
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* by the security manager's {@link SecurityManager#checkAccept checkAccept} |
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* method. The permission check is performed with privileges that are restricted |
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* by the calling context of this method. If the permission check fails then |
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* the connection is closed and the operation completes with a {@link |
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* SecurityException}. |
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* |
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* @param <A> |
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* The type of the attachment |
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* @param attachment |
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* The object to attach to the I/O operation; can be {@code null} |
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* @param handler |
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* The handler for consuming the result |
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* |
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* @throws AcceptPendingException |
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* If an accept operation is already in progress on this channel |
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* @throws NotYetBoundException |
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* If this channel's socket has not yet been bound |
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* @throws ShutdownChannelGroupException |
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* If the channel group has terminated |
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*/ |
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public abstract <A> void accept(A attachment, |
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CompletionHandler<AsynchronousSocketChannel,? super A> handler); |
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|
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/** |
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* Accepts a connection. |
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* |
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* <p> This method initiates an asynchronous operation to accept a |
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* connection made to this channel's socket. The method behaves in exactly |
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* the same manner as the {@link #accept(Object, CompletionHandler)} method |
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* except that instead of specifying a completion handler, this method |
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* returns a {@code Future} representing the pending result. The {@code |
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* Future}'s {@link Future#get() get} method returns the {@link |
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* AsynchronousSocketChannel} to the new connection on successful completion. |
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* |
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* @return a {@code Future} object representing the pending result |
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* |
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* @throws AcceptPendingException |
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* If an accept operation is already in progress on this channel |
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* @throws NotYetBoundException |
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* If this channel's socket has not yet been bound |
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*/ |
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public abstract Future<AsynchronousSocketChannel> accept(); |
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|
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/** |
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* {@inheritDoc} |
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* <p> |
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* If there is a security manager set, its {@code checkConnect} method is |
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* called with the local address and {@code -1} as its arguments to see |
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* if the operation is allowed. If the operation is not allowed, |
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* a {@code SocketAddress} representing the |
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* {@link java.net.InetAddress#getLoopbackAddress loopback} address and the |
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* local port of the channel's socket is returned. |
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* |
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* @return The {@code SocketAddress} that the socket is bound to, or the |
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* {@code SocketAddress} representing the loopback address if |
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* denied by the security manager, or {@code null} if the |
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* channel's socket is not bound |
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* |
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* @throws ClosedChannelException {@inheritDoc} |
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* @throws IOException {@inheritDoc} |
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*/ |
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@Override |
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public abstract SocketAddress getLocalAddress() throws IOException; |
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} |