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/*
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* Copyright 1995-2007 Sun Microsystems, Inc. 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. Sun designates this
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* particular file as subject to the "Classpath" exception as provided
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* by Sun 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 Sun Microsystems, Inc., 4150 Network Circle, Santa Clara,
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* CA 95054 USA or visit www.sun.com if you need additional information or
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* have any questions.
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*/
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package java.net;
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import java.io.FileDescriptor;
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import java.io.IOException;
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import java.nio.channels.ServerSocketChannel;
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import java.security.AccessController;
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import java.security.PrivilegedExceptionAction;
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/**
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* This class implements server sockets. A server socket waits for
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* requests to come in over the network. It performs some operation
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* based on that request, and then possibly returns a result to the requester.
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* <p>
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* The actual work of the server socket is performed by an instance
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* of the <code>SocketImpl</code> class. An application can
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* change the socket factory that creates the socket
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* implementation to configure itself to create sockets
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* appropriate to the local firewall.
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*
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* @author unascribed
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* @see java.net.SocketImpl
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* @see java.net.ServerSocket#setSocketFactory(java.net.SocketImplFactory)
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* @see java.nio.channels.ServerSocketChannel
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* @since JDK1.0
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*/
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public
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class ServerSocket implements java.io.Closeable {
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/**
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* Various states of this socket.
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*/
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private boolean created = false;
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private boolean bound = false;
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private boolean closed = false;
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private Object closeLock = new Object();
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/**
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* The implementation of this Socket.
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*/
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private SocketImpl impl;
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/**
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* Are we using an older SocketImpl?
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*/
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private boolean oldImpl = false;
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/**
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* Creates an unbound server socket.
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*
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* @exception IOException IO error when opening the socket.
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* @revised 1.4
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*/
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public ServerSocket() throws IOException {
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setImpl();
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}
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/**
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* Creates a server socket, bound to the specified port. A port number
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* of <code>0</code> means that the port number is automatically
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* allocated, typically from an ephemeral port range. This port
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* number can then be retrieved by calling {@link #getLocalPort getLocalPort}.
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* <p>
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* The maximum queue length for incoming connection indications (a
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* request to connect) is set to <code>50</code>. If a connection
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* indication arrives when the queue is full, the connection is refused.
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* <p>
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* If the application has specified a server socket factory, that
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* factory's <code>createSocketImpl</code> method is called to create
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* the actual socket implementation. Otherwise a "plain" socket is created.
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* <p>
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* If there is a security manager,
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* its <code>checkListen</code> method is called
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* with the <code>port</code> argument
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* as its argument to ensure the operation is allowed.
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* This could result in a SecurityException.
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*
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*
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* @param port the port number, or <code>0</code> to use a port
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* number that is automatically allocated.
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*
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* @exception IOException if an I/O error occurs when opening the socket.
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* @exception SecurityException
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* if a security manager exists and its <code>checkListen</code>
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* method doesn't allow the operation.
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* @exception IllegalArgumentException if the port parameter is outside
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* the specified range of valid port values, which is between
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* 0 and 65535, inclusive.
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*
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* @see java.net.SocketImpl
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* @see java.net.SocketImplFactory#createSocketImpl()
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* @see java.net.ServerSocket#setSocketFactory(java.net.SocketImplFactory)
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* @see SecurityManager#checkListen
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*/
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public ServerSocket(int port) throws IOException {
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this(port, 50, null);
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}
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/**
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* Creates a server socket and binds it to the specified local port
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* number, with the specified backlog.
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* A port number of <code>0</code> means that the port number is
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* automatically allocated, typically from an ephemeral port range.
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* This port number can then be retrieved by calling
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* {@link #getLocalPort getLocalPort}.
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* <p>
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* The maximum queue length for incoming connection indications (a
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* request to connect) is set to the <code>backlog</code> parameter. If
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* a connection indication arrives when the queue is full, the
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* connection is refused.
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* <p>
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* If the application has specified a server socket factory, that
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* factory's <code>createSocketImpl</code> method is called to create
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* the actual socket implementation. Otherwise a "plain" socket is created.
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* <p>
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* If there is a security manager,
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* its <code>checkListen</code> method is called
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* with the <code>port</code> argument
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* as its argument to ensure the operation is allowed.
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* This could result in a SecurityException.
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*
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* <P>The <code>backlog</code> argument must be a positive
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* value greater than 0. If the value passed is equal or less
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* than 0, then the default value will be assumed.
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* <P>
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*
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* @param port the port number, or <code>0</code> to use a port
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* number that is automatically allocated.
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* @param backlog the maximum length of the queue.
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*
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* @exception IOException if an I/O error occurs when opening the socket.
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* @exception SecurityException
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* if a security manager exists and its <code>checkListen</code>
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* method doesn't allow the operation.
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* @exception IllegalArgumentException if the port parameter is outside
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* the specified range of valid port values, which is between
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* 0 and 65535, inclusive.
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*
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* @see java.net.SocketImpl
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* @see java.net.SocketImplFactory#createSocketImpl()
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* @see java.net.ServerSocket#setSocketFactory(java.net.SocketImplFactory)
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* @see SecurityManager#checkListen
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*/
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public ServerSocket(int port, int backlog) throws IOException {
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this(port, backlog, null);
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}
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/**
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* Create a server with the specified port, listen backlog, and
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* local IP address to bind to. The <i>bindAddr</i> argument
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* can be used on a multi-homed host for a ServerSocket that
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* will only accept connect requests to one of its addresses.
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* If <i>bindAddr</i> is null, it will default accepting
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* connections on any/all local addresses.
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* The port must be between 0 and 65535, inclusive.
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* A port number of <code>0</code> means that the port number is
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* automatically allocated, typically from an ephemeral port range.
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* This port number can then be retrieved by calling
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* {@link #getLocalPort getLocalPort}.
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*
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* <P>If there is a security manager, this method
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* calls its <code>checkListen</code> method
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* with the <code>port</code> argument
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* as its argument to ensure the operation is allowed.
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* This could result in a SecurityException.
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*
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* <P>The <code>backlog</code> argument must be a positive
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* value greater than 0. If the value passed is equal or less
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* than 0, then the default value will be assumed.
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* <P>
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* @param port the port number, or <code>0</code> to use a port
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* number that is automatically allocated.
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* @param backlog the listen backlog
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* @param bindAddr the local InetAddress the server will bind to
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*
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* @throws SecurityException if a security manager exists and
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* its <code>checkListen</code> method doesn't allow the operation.
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*
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* @throws IOException if an I/O error occurs when opening the socket.
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* @exception IllegalArgumentException if the port parameter is outside
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* the specified range of valid port values, which is between
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* 0 and 65535, inclusive.
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*
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* @see SocketOptions
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* @see SocketImpl
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* @see SecurityManager#checkListen
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* @since JDK1.1
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*/
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public ServerSocket(int port, int backlog, InetAddress bindAddr) throws IOException {
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setImpl();
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if (port < 0 || port > 0xFFFF)
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throw new IllegalArgumentException(
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"Port value out of range: " + port);
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if (backlog < 1)
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backlog = 50;
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try {
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bind(new InetSocketAddress(bindAddr, port), backlog);
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} catch(SecurityException e) {
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close();
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throw e;
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} catch(IOException e) {
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close();
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throw e;
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}
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}
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/**
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* Get the <code>SocketImpl</code> attached to this socket, creating
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* it if necessary.
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*
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* @return the <code>SocketImpl</code> attached to that ServerSocket.
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* @throws SocketException if creation fails.
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* @since 1.4
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*/
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SocketImpl getImpl() throws SocketException {
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if (!created)
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createImpl();
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return impl;
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}
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private void checkOldImpl() {
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if (impl == null)
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return;
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// SocketImpl.connect() is a protected method, therefore we need to use
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// getDeclaredMethod, therefore we need permission to access the member
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try {
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AccessController.doPrivileged(new PrivilegedExceptionAction() {
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public Object run() throws NoSuchMethodException {
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Class[] cl = new Class[2];
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cl[0] = SocketAddress.class;
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cl[1] = Integer.TYPE;
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impl.getClass().getDeclaredMethod("connect", cl);
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return null;
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}
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});
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} catch (java.security.PrivilegedActionException e) {
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oldImpl = true;
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}
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}
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private void setImpl() {
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if (factory != null) {
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impl = factory.createSocketImpl();
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checkOldImpl();
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} else {
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// No need to do a checkOldImpl() here, we know it's an up to date
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// SocketImpl!
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impl = new SocksSocketImpl();
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}
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if (impl != null)
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impl.setServerSocket(this);
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}
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/**
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* Creates the socket implementation.
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*
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* @throws IOException if creation fails
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* @since 1.4
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*/
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void createImpl() throws SocketException {
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if (impl == null)
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setImpl();
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try {
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impl.create(true);
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created = true;
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} catch (IOException e) {
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throw new SocketException(e.getMessage());
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}
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}
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|
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/**
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*
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* Binds the <code>ServerSocket</code> to a specific address
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* (IP address and port number).
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* <p>
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* If the address is <code>null</code>, then the system will pick up
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* an ephemeral port and a valid local address to bind the socket.
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* <p>
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* @param endpoint The IP address & port number to bind to.
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* @throws IOException if the bind operation fails, or if the socket
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* is already bound.
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* @throws SecurityException if a <code>SecurityManager</code> is present and
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* its <code>checkListen</code> method doesn't allow the operation.
|
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307 |
* @throws IllegalArgumentException if endpoint is a
|
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308 |
* SocketAddress subclass not supported by this socket
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309 |
* @since 1.4
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310 |
*/
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public void bind(SocketAddress endpoint) throws IOException {
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bind(endpoint, 50);
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}
|
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314 |
|
|
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/**
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316 |
*
|
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* Binds the <code>ServerSocket</code> to a specific address
|
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318 |
* (IP address and port number).
|
|
319 |
* <p>
|
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320 |
* If the address is <code>null</code>, then the system will pick up
|
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321 |
* an ephemeral port and a valid local address to bind the socket.
|
|
322 |
* <P>
|
|
323 |
* The <code>backlog</code> argument must be a positive
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|
324 |
* value greater than 0. If the value passed is equal or less
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|
325 |
* than 0, then the default value will be assumed.
|
|
326 |
* @param endpoint The IP address & port number to bind to.
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|
327 |
* @param backlog The listen backlog length.
|
|
328 |
* @throws IOException if the bind operation fails, or if the socket
|
|
329 |
* is already bound.
|
|
330 |
* @throws SecurityException if a <code>SecurityManager</code> is present and
|
|
331 |
* its <code>checkListen</code> method doesn't allow the operation.
|
|
332 |
* @throws IllegalArgumentException if endpoint is a
|
|
333 |
* SocketAddress subclass not supported by this socket
|
|
334 |
* @since 1.4
|
|
335 |
*/
|
|
336 |
public void bind(SocketAddress endpoint, int backlog) throws IOException {
|
|
337 |
if (isClosed())
|
|
338 |
throw new SocketException("Socket is closed");
|
|
339 |
if (!oldImpl && isBound())
|
|
340 |
throw new SocketException("Already bound");
|
|
341 |
if (endpoint == null)
|
|
342 |
endpoint = new InetSocketAddress(0);
|
|
343 |
if (!(endpoint instanceof InetSocketAddress))
|
|
344 |
throw new IllegalArgumentException("Unsupported address type");
|
|
345 |
InetSocketAddress epoint = (InetSocketAddress) endpoint;
|
|
346 |
if (epoint.isUnresolved())
|
|
347 |
throw new SocketException("Unresolved address");
|
|
348 |
if (backlog < 1)
|
|
349 |
backlog = 50;
|
|
350 |
try {
|
|
351 |
SecurityManager security = System.getSecurityManager();
|
|
352 |
if (security != null)
|
|
353 |
security.checkListen(epoint.getPort());
|
|
354 |
getImpl().bind(epoint.getAddress(), epoint.getPort());
|
|
355 |
getImpl().listen(backlog);
|
|
356 |
bound = true;
|
|
357 |
} catch(SecurityException e) {
|
|
358 |
bound = false;
|
|
359 |
throw e;
|
|
360 |
} catch(IOException e) {
|
|
361 |
bound = false;
|
|
362 |
throw e;
|
|
363 |
}
|
|
364 |
}
|
|
365 |
|
|
366 |
/**
|
|
367 |
* Returns the local address of this server socket.
|
|
368 |
* <p>
|
|
369 |
* If the socket was bound prior to being {@link #close closed},
|
|
370 |
* then this method will continue to return the local address
|
|
371 |
* after the socket is closed.
|
|
372 |
*
|
|
373 |
* @return the address to which this socket is bound,
|
|
374 |
* or <code>null</code> if the socket is unbound.
|
|
375 |
*/
|
|
376 |
public InetAddress getInetAddress() {
|
|
377 |
if (!isBound())
|
|
378 |
return null;
|
|
379 |
try {
|
|
380 |
return getImpl().getInetAddress();
|
|
381 |
} catch (SocketException e) {
|
|
382 |
// nothing
|
|
383 |
// If we're bound, the impl has been created
|
|
384 |
// so we shouldn't get here
|
|
385 |
}
|
|
386 |
return null;
|
|
387 |
}
|
|
388 |
|
|
389 |
/**
|
|
390 |
* Returns the port number on which this socket is listening.
|
|
391 |
* <p>
|
|
392 |
* If the socket was bound prior to being {@link #close closed},
|
|
393 |
* then this method will continue to return the port number
|
|
394 |
* after the socket is closed.
|
|
395 |
*
|
|
396 |
* @return the port number to which this socket is listening or
|
|
397 |
* -1 if the socket is not bound yet.
|
|
398 |
*/
|
|
399 |
public int getLocalPort() {
|
|
400 |
if (!isBound())
|
|
401 |
return -1;
|
|
402 |
try {
|
|
403 |
return getImpl().getLocalPort();
|
|
404 |
} catch (SocketException e) {
|
|
405 |
// nothing
|
|
406 |
// If we're bound, the impl has been created
|
|
407 |
// so we shouldn't get here
|
|
408 |
}
|
|
409 |
return -1;
|
|
410 |
}
|
|
411 |
|
|
412 |
/**
|
|
413 |
* Returns the address of the endpoint this socket is bound to, or
|
|
414 |
* <code>null</code> if it is not bound yet.
|
|
415 |
* <p>
|
|
416 |
* If the socket was bound prior to being {@link #close closed},
|
|
417 |
* then this method will continue to return the address of the endpoint
|
|
418 |
* after the socket is closed.
|
|
419 |
*
|
|
420 |
* @return a <code>SocketAddress</code> representing the local endpoint of this
|
|
421 |
* socket, or <code>null</code> if it is not bound yet.
|
|
422 |
* @see #getInetAddress()
|
|
423 |
* @see #getLocalPort()
|
|
424 |
* @see #bind(SocketAddress)
|
|
425 |
* @since 1.4
|
|
426 |
*/
|
|
427 |
|
|
428 |
public SocketAddress getLocalSocketAddress() {
|
|
429 |
if (!isBound())
|
|
430 |
return null;
|
|
431 |
return new InetSocketAddress(getInetAddress(), getLocalPort());
|
|
432 |
}
|
|
433 |
|
|
434 |
/**
|
|
435 |
* Listens for a connection to be made to this socket and accepts
|
|
436 |
* it. The method blocks until a connection is made.
|
|
437 |
*
|
|
438 |
* <p>A new Socket <code>s</code> is created and, if there
|
|
439 |
* is a security manager,
|
|
440 |
* the security manager's <code>checkAccept</code> method is called
|
|
441 |
* with <code>s.getInetAddress().getHostAddress()</code> and
|
|
442 |
* <code>s.getPort()</code>
|
|
443 |
* as its arguments to ensure the operation is allowed.
|
|
444 |
* This could result in a SecurityException.
|
|
445 |
*
|
|
446 |
* @exception IOException if an I/O error occurs when waiting for a
|
|
447 |
* connection.
|
|
448 |
* @exception SecurityException if a security manager exists and its
|
|
449 |
* <code>checkAccept</code> method doesn't allow the operation.
|
|
450 |
* @exception SocketTimeoutException if a timeout was previously set with setSoTimeout and
|
|
451 |
* the timeout has been reached.
|
|
452 |
* @exception java.nio.channels.IllegalBlockingModeException
|
|
453 |
* if this socket has an associated channel, the channel is in
|
|
454 |
* non-blocking mode, and there is no connection ready to be
|
|
455 |
* accepted
|
|
456 |
*
|
|
457 |
* @return the new Socket
|
|
458 |
* @see SecurityManager#checkAccept
|
|
459 |
* @revised 1.4
|
|
460 |
* @spec JSR-51
|
|
461 |
*/
|
|
462 |
public Socket accept() throws IOException {
|
|
463 |
if (isClosed())
|
|
464 |
throw new SocketException("Socket is closed");
|
|
465 |
if (!isBound())
|
|
466 |
throw new SocketException("Socket is not bound yet");
|
|
467 |
Socket s = new Socket((SocketImpl) null);
|
|
468 |
implAccept(s);
|
|
469 |
return s;
|
|
470 |
}
|
|
471 |
|
|
472 |
/**
|
|
473 |
* Subclasses of ServerSocket use this method to override accept()
|
|
474 |
* to return their own subclass of socket. So a FooServerSocket
|
|
475 |
* will typically hand this method an <i>empty</i> FooSocket. On
|
|
476 |
* return from implAccept the FooSocket will be connected to a client.
|
|
477 |
*
|
|
478 |
* @param s the Socket
|
|
479 |
* @throws java.nio.channels.IllegalBlockingModeException
|
|
480 |
* if this socket has an associated channel,
|
|
481 |
* and the channel is in non-blocking mode
|
|
482 |
* @throws IOException if an I/O error occurs when waiting
|
|
483 |
* for a connection.
|
|
484 |
* @since JDK1.1
|
|
485 |
* @revised 1.4
|
|
486 |
* @spec JSR-51
|
|
487 |
*/
|
|
488 |
protected final void implAccept(Socket s) throws IOException {
|
|
489 |
SocketImpl si = null;
|
|
490 |
try {
|
|
491 |
if (s.impl == null)
|
|
492 |
s.setImpl();
|
|
493 |
else {
|
|
494 |
s.impl.reset();
|
|
495 |
}
|
|
496 |
si = s.impl;
|
|
497 |
s.impl = null;
|
|
498 |
si.address = new InetAddress();
|
|
499 |
si.fd = new FileDescriptor();
|
|
500 |
getImpl().accept(si);
|
|
501 |
|
|
502 |
SecurityManager security = System.getSecurityManager();
|
|
503 |
if (security != null) {
|
|
504 |
security.checkAccept(si.getInetAddress().getHostAddress(),
|
|
505 |
si.getPort());
|
|
506 |
}
|
|
507 |
} catch (IOException e) {
|
|
508 |
if (si != null)
|
|
509 |
si.reset();
|
|
510 |
s.impl = si;
|
|
511 |
throw e;
|
|
512 |
} catch (SecurityException e) {
|
|
513 |
if (si != null)
|
|
514 |
si.reset();
|
|
515 |
s.impl = si;
|
|
516 |
throw e;
|
|
517 |
}
|
|
518 |
s.impl = si;
|
|
519 |
s.postAccept();
|
|
520 |
}
|
|
521 |
|
|
522 |
/**
|
|
523 |
* Closes this socket.
|
|
524 |
*
|
|
525 |
* Any thread currently blocked in {@link #accept()} will throw
|
|
526 |
* a {@link SocketException}.
|
|
527 |
*
|
|
528 |
* <p> If this socket has an associated channel then the channel is closed
|
|
529 |
* as well.
|
|
530 |
*
|
|
531 |
* @exception IOException if an I/O error occurs when closing the socket.
|
|
532 |
* @revised 1.4
|
|
533 |
* @spec JSR-51
|
|
534 |
*/
|
|
535 |
public void close() throws IOException {
|
|
536 |
synchronized(closeLock) {
|
|
537 |
if (isClosed())
|
|
538 |
return;
|
|
539 |
if (created)
|
|
540 |
impl.close();
|
|
541 |
closed = true;
|
|
542 |
}
|
|
543 |
}
|
|
544 |
|
|
545 |
/**
|
|
546 |
* Returns the unique {@link java.nio.channels.ServerSocketChannel} object
|
|
547 |
* associated with this socket, if any.
|
|
548 |
*
|
|
549 |
* <p> A server socket will have a channel if, and only if, the channel
|
|
550 |
* itself was created via the {@link
|
|
551 |
* java.nio.channels.ServerSocketChannel#open ServerSocketChannel.open}
|
|
552 |
* method.
|
|
553 |
*
|
|
554 |
* @return the server-socket channel associated with this socket,
|
|
555 |
* or <tt>null</tt> if this socket was not created
|
|
556 |
* for a channel
|
|
557 |
*
|
|
558 |
* @since 1.4
|
|
559 |
* @spec JSR-51
|
|
560 |
*/
|
|
561 |
public ServerSocketChannel getChannel() {
|
|
562 |
return null;
|
|
563 |
}
|
|
564 |
|
|
565 |
/**
|
|
566 |
* Returns the binding state of the ServerSocket.
|
|
567 |
*
|
|
568 |
* @return true if the ServerSocket succesfuly bound to an address
|
|
569 |
* @since 1.4
|
|
570 |
*/
|
|
571 |
public boolean isBound() {
|
|
572 |
// Before 1.3 ServerSockets were always bound during creation
|
|
573 |
return bound || oldImpl;
|
|
574 |
}
|
|
575 |
|
|
576 |
/**
|
|
577 |
* Returns the closed state of the ServerSocket.
|
|
578 |
*
|
|
579 |
* @return true if the socket has been closed
|
|
580 |
* @since 1.4
|
|
581 |
*/
|
|
582 |
public boolean isClosed() {
|
|
583 |
synchronized(closeLock) {
|
|
584 |
return closed;
|
|
585 |
}
|
|
586 |
}
|
|
587 |
|
|
588 |
/**
|
|
589 |
* Enable/disable SO_TIMEOUT with the specified timeout, in
|
|
590 |
* milliseconds. With this option set to a non-zero timeout,
|
|
591 |
* a call to accept() for this ServerSocket
|
|
592 |
* will block for only this amount of time. If the timeout expires,
|
|
593 |
* a <B>java.net.SocketTimeoutException</B> is raised, though the
|
|
594 |
* ServerSocket is still valid. The option <B>must</B> be enabled
|
|
595 |
* prior to entering the blocking operation to have effect. The
|
|
596 |
* timeout must be > 0.
|
|
597 |
* A timeout of zero is interpreted as an infinite timeout.
|
|
598 |
* @param timeout the specified timeout, in milliseconds
|
|
599 |
* @exception SocketException if there is an error in
|
|
600 |
* the underlying protocol, such as a TCP error.
|
|
601 |
* @since JDK1.1
|
|
602 |
* @see #getSoTimeout()
|
|
603 |
*/
|
|
604 |
public synchronized void setSoTimeout(int timeout) throws SocketException {
|
|
605 |
if (isClosed())
|
|
606 |
throw new SocketException("Socket is closed");
|
|
607 |
getImpl().setOption(SocketOptions.SO_TIMEOUT, new Integer(timeout));
|
|
608 |
}
|
|
609 |
|
|
610 |
/**
|
|
611 |
* Retrieve setting for SO_TIMEOUT. 0 returns implies that the
|
|
612 |
* option is disabled (i.e., timeout of infinity).
|
|
613 |
* @return the SO_TIMEOUT value
|
|
614 |
* @exception IOException if an I/O error occurs
|
|
615 |
* @since JDK1.1
|
|
616 |
* @see #setSoTimeout(int)
|
|
617 |
*/
|
|
618 |
public synchronized int getSoTimeout() throws IOException {
|
|
619 |
if (isClosed())
|
|
620 |
throw new SocketException("Socket is closed");
|
|
621 |
Object o = getImpl().getOption(SocketOptions.SO_TIMEOUT);
|
|
622 |
/* extra type safety */
|
|
623 |
if (o instanceof Integer) {
|
|
624 |
return ((Integer) o).intValue();
|
|
625 |
} else {
|
|
626 |
return 0;
|
|
627 |
}
|
|
628 |
}
|
|
629 |
|
|
630 |
/**
|
|
631 |
* Enable/disable the SO_REUSEADDR socket option.
|
|
632 |
* <p>
|
|
633 |
* When a TCP connection is closed the connection may remain
|
|
634 |
* in a timeout state for a period of time after the connection
|
|
635 |
* is closed (typically known as the <tt>TIME_WAIT</tt> state
|
|
636 |
* or <tt>2MSL</tt> wait state).
|
|
637 |
* For applications using a well known socket address or port
|
|
638 |
* it may not be possible to bind a socket to the required
|
|
639 |
* <tt>SocketAddress</tt> if there is a connection in the
|
|
640 |
* timeout state involving the socket address or port.
|
|
641 |
* <p>
|
|
642 |
* Enabling <tt>SO_REUSEADDR</tt> prior to binding the socket
|
|
643 |
* using {@link #bind(SocketAddress)} allows the socket to be
|
|
644 |
* bound even though a previous connection is in a timeout
|
|
645 |
* state.
|
|
646 |
* <p>
|
|
647 |
* When a <tt>ServerSocket</tt> is created the initial setting
|
|
648 |
* of <tt>SO_REUSEADDR</tt> is not defined. Applications can
|
|
649 |
* use {@link #getReuseAddress()} to determine the initial
|
|
650 |
* setting of <tt>SO_REUSEADDR</tt>.
|
|
651 |
* <p>
|
|
652 |
* The behaviour when <tt>SO_REUSEADDR</tt> is enabled or
|
|
653 |
* disabled after a socket is bound (See {@link #isBound()})
|
|
654 |
* is not defined.
|
|
655 |
*
|
|
656 |
* @param on whether to enable or disable the socket option
|
|
657 |
* @exception SocketException if an error occurs enabling or
|
|
658 |
* disabling the <tt>SO_RESUEADDR</tt> socket option,
|
|
659 |
* or the socket is closed.
|
|
660 |
* @since 1.4
|
|
661 |
* @see #getReuseAddress()
|
|
662 |
* @see #bind(SocketAddress)
|
|
663 |
* @see #isBound()
|
|
664 |
* @see #isClosed()
|
|
665 |
*/
|
|
666 |
public void setReuseAddress(boolean on) throws SocketException {
|
|
667 |
if (isClosed())
|
|
668 |
throw new SocketException("Socket is closed");
|
|
669 |
getImpl().setOption(SocketOptions.SO_REUSEADDR, Boolean.valueOf(on));
|
|
670 |
}
|
|
671 |
|
|
672 |
/**
|
|
673 |
* Tests if SO_REUSEADDR is enabled.
|
|
674 |
*
|
|
675 |
* @return a <code>boolean</code> indicating whether or not SO_REUSEADDR is enabled.
|
|
676 |
* @exception SocketException if there is an error
|
|
677 |
* in the underlying protocol, such as a TCP error.
|
|
678 |
* @since 1.4
|
|
679 |
* @see #setReuseAddress(boolean)
|
|
680 |
*/
|
|
681 |
public boolean getReuseAddress() throws SocketException {
|
|
682 |
if (isClosed())
|
|
683 |
throw new SocketException("Socket is closed");
|
|
684 |
return ((Boolean) (getImpl().getOption(SocketOptions.SO_REUSEADDR))).booleanValue();
|
|
685 |
}
|
|
686 |
|
|
687 |
/**
|
|
688 |
* Returns the implementation address and implementation port of
|
|
689 |
* this socket as a <code>String</code>.
|
|
690 |
*
|
|
691 |
* @return a string representation of this socket.
|
|
692 |
*/
|
|
693 |
public String toString() {
|
|
694 |
if (!isBound())
|
|
695 |
return "ServerSocket[unbound]";
|
|
696 |
return "ServerSocket[addr=" + impl.getInetAddress() +
|
|
697 |
",port=" + impl.getPort() +
|
|
698 |
",localport=" + impl.getLocalPort() + "]";
|
|
699 |
}
|
|
700 |
|
|
701 |
void setBound() {
|
|
702 |
bound = true;
|
|
703 |
}
|
|
704 |
|
|
705 |
void setCreated() {
|
|
706 |
created = true;
|
|
707 |
}
|
|
708 |
|
|
709 |
/**
|
|
710 |
* The factory for all server sockets.
|
|
711 |
*/
|
|
712 |
private static SocketImplFactory factory = null;
|
|
713 |
|
|
714 |
/**
|
|
715 |
* Sets the server socket implementation factory for the
|
|
716 |
* application. The factory can be specified only once.
|
|
717 |
* <p>
|
|
718 |
* When an application creates a new server socket, the socket
|
|
719 |
* implementation factory's <code>createSocketImpl</code> method is
|
|
720 |
* called to create the actual socket implementation.
|
|
721 |
* <p>
|
|
722 |
* Passing <code>null</code> to the method is a no-op unless the factory
|
|
723 |
* was already set.
|
|
724 |
* <p>
|
|
725 |
* If there is a security manager, this method first calls
|
|
726 |
* the security manager's <code>checkSetFactory</code> method
|
|
727 |
* to ensure the operation is allowed.
|
|
728 |
* This could result in a SecurityException.
|
|
729 |
*
|
|
730 |
* @param fac the desired factory.
|
|
731 |
* @exception IOException if an I/O error occurs when setting the
|
|
732 |
* socket factory.
|
|
733 |
* @exception SocketException if the factory has already been defined.
|
|
734 |
* @exception SecurityException if a security manager exists and its
|
|
735 |
* <code>checkSetFactory</code> method doesn't allow the operation.
|
|
736 |
* @see java.net.SocketImplFactory#createSocketImpl()
|
|
737 |
* @see SecurityManager#checkSetFactory
|
|
738 |
*/
|
|
739 |
public static synchronized void setSocketFactory(SocketImplFactory fac) throws IOException {
|
|
740 |
if (factory != null) {
|
|
741 |
throw new SocketException("factory already defined");
|
|
742 |
}
|
|
743 |
SecurityManager security = System.getSecurityManager();
|
|
744 |
if (security != null) {
|
|
745 |
security.checkSetFactory();
|
|
746 |
}
|
|
747 |
factory = fac;
|
|
748 |
}
|
|
749 |
|
|
750 |
/**
|
|
751 |
* Sets a default proposed value for the SO_RCVBUF option for sockets
|
|
752 |
* accepted from this <tt>ServerSocket</tt>. The value actually set
|
|
753 |
* in the accepted socket must be determined by calling
|
|
754 |
* {@link Socket#getReceiveBufferSize()} after the socket
|
|
755 |
* is returned by {@link #accept()}.
|
|
756 |
* <p>
|
|
757 |
* The value of SO_RCVBUF is used both to set the size of the internal
|
|
758 |
* socket receive buffer, and to set the size of the TCP receive window
|
|
759 |
* that is advertized to the remote peer.
|
|
760 |
* <p>
|
|
761 |
* It is possible to change the value subsequently, by calling
|
|
762 |
* {@link Socket#setReceiveBufferSize(int)}. However, if the application
|
|
763 |
* wishes to allow a receive window larger than 64K bytes, as defined by RFC1323
|
|
764 |
* then the proposed value must be set in the ServerSocket <B>before</B>
|
|
765 |
* it is bound to a local address. This implies, that the ServerSocket must be
|
|
766 |
* created with the no-argument constructor, then setReceiveBufferSize() must
|
|
767 |
* be called and lastly the ServerSocket is bound to an address by calling bind().
|
|
768 |
* <p>
|
|
769 |
* Failure to do this will not cause an error, and the buffer size may be set to the
|
|
770 |
* requested value but the TCP receive window in sockets accepted from
|
|
771 |
* this ServerSocket will be no larger than 64K bytes.
|
|
772 |
*
|
|
773 |
* @exception SocketException if there is an error
|
|
774 |
* in the underlying protocol, such as a TCP error.
|
|
775 |
*
|
|
776 |
* @param size the size to which to set the receive buffer
|
|
777 |
* size. This value must be greater than 0.
|
|
778 |
*
|
|
779 |
* @exception IllegalArgumentException if the
|
|
780 |
* value is 0 or is negative.
|
|
781 |
*
|
|
782 |
* @since 1.4
|
|
783 |
* @see #getReceiveBufferSize
|
|
784 |
*/
|
|
785 |
public synchronized void setReceiveBufferSize (int size) throws SocketException {
|
|
786 |
if (!(size > 0)) {
|
|
787 |
throw new IllegalArgumentException("negative receive size");
|
|
788 |
}
|
|
789 |
if (isClosed())
|
|
790 |
throw new SocketException("Socket is closed");
|
|
791 |
getImpl().setOption(SocketOptions.SO_RCVBUF, new Integer(size));
|
|
792 |
}
|
|
793 |
|
|
794 |
/**
|
|
795 |
* Gets the value of the SO_RCVBUF option for this <tt>ServerSocket</tt>,
|
|
796 |
* that is the proposed buffer size that will be used for Sockets accepted
|
|
797 |
* from this <tt>ServerSocket</tt>.
|
|
798 |
*
|
|
799 |
* <p>Note, the value actually set in the accepted socket is determined by
|
|
800 |
* calling {@link Socket#getReceiveBufferSize()}.
|
|
801 |
* @return the value of the SO_RCVBUF option for this <tt>Socket</tt>.
|
|
802 |
* @exception SocketException if there is an error
|
|
803 |
* in the underlying protocol, such as a TCP error.
|
|
804 |
* @see #setReceiveBufferSize(int)
|
|
805 |
* @since 1.4
|
|
806 |
*/
|
|
807 |
public synchronized int getReceiveBufferSize()
|
|
808 |
throws SocketException{
|
|
809 |
if (isClosed())
|
|
810 |
throw new SocketException("Socket is closed");
|
|
811 |
int result = 0;
|
|
812 |
Object o = getImpl().getOption(SocketOptions.SO_RCVBUF);
|
|
813 |
if (o instanceof Integer) {
|
|
814 |
result = ((Integer)o).intValue();
|
|
815 |
}
|
|
816 |
return result;
|
|
817 |
}
|
|
818 |
|
|
819 |
/**
|
|
820 |
* Sets performance preferences for this ServerSocket.
|
|
821 |
*
|
|
822 |
* <p> Sockets use the TCP/IP protocol by default. Some implementations
|
|
823 |
* may offer alternative protocols which have different performance
|
|
824 |
* characteristics than TCP/IP. This method allows the application to
|
|
825 |
* express its own preferences as to how these tradeoffs should be made
|
|
826 |
* when the implementation chooses from the available protocols.
|
|
827 |
*
|
|
828 |
* <p> Performance preferences are described by three integers
|
|
829 |
* whose values indicate the relative importance of short connection time,
|
|
830 |
* low latency, and high bandwidth. The absolute values of the integers
|
|
831 |
* are irrelevant; in order to choose a protocol the values are simply
|
|
832 |
* compared, with larger values indicating stronger preferences. If the
|
|
833 |
* application prefers short connection time over both low latency and high
|
|
834 |
* bandwidth, for example, then it could invoke this method with the values
|
|
835 |
* <tt>(1, 0, 0)</tt>. If the application prefers high bandwidth above low
|
|
836 |
* latency, and low latency above short connection time, then it could
|
|
837 |
* invoke this method with the values <tt>(0, 1, 2)</tt>.
|
|
838 |
*
|
|
839 |
* <p> Invoking this method after this socket has been bound
|
|
840 |
* will have no effect. This implies that in order to use this capability
|
|
841 |
* requires the socket to be created with the no-argument constructor.
|
|
842 |
*
|
|
843 |
* @param connectionTime
|
|
844 |
* An <tt>int</tt> expressing the relative importance of a short
|
|
845 |
* connection time
|
|
846 |
*
|
|
847 |
* @param latency
|
|
848 |
* An <tt>int</tt> expressing the relative importance of low
|
|
849 |
* latency
|
|
850 |
*
|
|
851 |
* @param bandwidth
|
|
852 |
* An <tt>int</tt> expressing the relative importance of high
|
|
853 |
* bandwidth
|
|
854 |
*
|
|
855 |
* @since 1.5
|
|
856 |
*/
|
|
857 |
public void setPerformancePreferences(int connectionTime,
|
|
858 |
int latency,
|
|
859 |
int bandwidth)
|
|
860 |
{
|
|
861 |
/* Not implemented yet */
|
|
862 |
}
|
|
863 |
|
|
864 |
}
|