author | khazra |
Thu, 14 Mar 2013 13:46:15 -0700 | |
changeset 18192 | fa6bd0992104 |
parent 10596 | 39b3a979e600 |
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.net; |
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import java.security.AccessController; |
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import java.security.PrivilegedAction; |
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/** |
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* This class defines a factory for creating DatagramSocketImpls. It defaults |
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* to creating plain DatagramSocketImpls, but may create other DatagramSocketImpls |
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* by setting the impl.prefix system property. |
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* |
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* For Windows versions lower than Windows Vista a TwoStacksPlainDatagramSocketImpl |
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* is always created. This impl supports IPv6 on these platform where available. |
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* |
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* On Windows platforms greater than Vista that support a dual layer TCP/IP stack |
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* a DualStackPlainDatagramSocketImpl is created for DatagramSockets. For MulticastSockets |
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* a TwoStacksPlainDatagramSocketImpl is always created. This is to overcome the lack |
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* of behavior defined for multicasting over a dual layer socket by the RFC. |
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* |
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* @author Chris Hegarty |
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*/ |
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class DefaultDatagramSocketImplFactory |
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{ |
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static Class<?> prefixImplClass = null; |
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/* the windows version. */ |
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private static float version; |
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/* java.net.preferIPv4Stack */ |
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private static boolean preferIPv4Stack = false; |
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/* If the version supports a dual stack TCP implementation */ |
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private static boolean useDualStackImpl = false; |
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/* sun.net.useExclusiveBind */ |
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private static String exclBindProp; |
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/* True if exclusive binding is on for Windows */ |
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private static boolean exclusiveBind = true; |
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static { |
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// Determine Windows Version. |
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java.security.AccessController.doPrivileged( |
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new PrivilegedAction<Object>() { |
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public Object run() { |
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version = 0; |
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try { |
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version = Float.parseFloat(System.getProperties() |
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.getProperty("os.version")); |
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preferIPv4Stack = Boolean.parseBoolean( |
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System.getProperties() |
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.getProperty( |
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"java.net.preferIPv4Stack")); |
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exclBindProp = System.getProperty( |
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"sun.net.useExclusiveBind"); |
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} catch (NumberFormatException e ) { |
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assert false : e; |
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} |
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return null; // nothing to return |
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} |
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}); |
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// (version >= 6.0) implies Vista or greater. |
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if (version >= 6.0 && !preferIPv4Stack) { |
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useDualStackImpl = true; |
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} |
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if (exclBindProp != null) { |
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// sun.net.useExclusiveBind is true |
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exclusiveBind = exclBindProp.length() == 0 ? true |
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: Boolean.parseBoolean(exclBindProp); |
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} else if (version < 6.0) { |
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exclusiveBind = false; |
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} |
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// impl.prefix |
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String prefix = null; |
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try { |
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prefix = AccessController.doPrivileged( |
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new sun.security.action.GetPropertyAction("impl.prefix", null)); |
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if (prefix != null) |
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prefixImplClass = Class.forName("java.net."+prefix+"DatagramSocketImpl"); |
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} catch (Exception e) { |
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System.err.println("Can't find class: java.net." + |
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prefix + |
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"DatagramSocketImpl: check impl.prefix property"); |
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} |
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} |
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/** |
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* Creates a new <code>DatagramSocketImpl</code> instance. |
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* |
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* @param isMulticast true if this impl is to be used for a MutlicastSocket |
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* @return a new instance of <code>PlainDatagramSocketImpl</code>. |
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*/ |
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static DatagramSocketImpl createDatagramSocketImpl(boolean isMulticast) |
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throws SocketException { |
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if (prefixImplClass != null) { |
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try { |
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return (DatagramSocketImpl) prefixImplClass.newInstance(); |
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} catch (Exception e) { |
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throw new SocketException("can't instantiate DatagramSocketImpl"); |
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} |
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} else { |
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if (isMulticast) |
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exclusiveBind = false; |
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if (useDualStackImpl && !isMulticast) |
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return new DualStackPlainDatagramSocketImpl(exclusiveBind); |
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else |
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return new TwoStacksPlainDatagramSocketImpl(exclusiveBind); |
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} |
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} |
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} |