1 /* 2 * Copyright (c) 2001, 2018, Oracle and/or its affiliates. All rights reserved. 3 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER. 4 * 5 * This code is free software; you can redistribute it and/or modify it 6 * under the terms of the GNU General Public License version 2 only, as 7 * published by the Free Software Foundation. Oracle designates this 8 * particular file as subject to the "Classpath" exception as provided 9 * by Oracle in the LICENSE file that accompanied this code. 10 * 11 * This code is distributed in the hope that it will be useful, but WITHOUT 12 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or 13 * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License 14 * version 2 for more details (a copy is included in the LICENSE file that 15 * accompanied this code). 16 * 17 * You should have received a copy of the GNU General Public License version 18 * 2 along with this work; if not, write to the Free Software Foundation, 19 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA. 20 * 21 * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA 22 * or visit www.oracle.com if you need additional information or have any 23 * questions. 24 */ 25 26 package rdma.ch; 27 28 import java.io.IOException; 29 import java.nio.channels.*; 30 import java.nio.channels.spi.*; 31 import sun.nio.ch.SelectorProviderImpl; 32 import java.security.AccessController; 33 import java.security.PrivilegedAction; 34 35 public class RdmaPollSelectorProvider 36 extends SelectorProviderImpl 37 { 38 private static final Object lock = new Object(); 39 private static SelectorProvider provider = null; 40 41 private static PlatformRdmaPollSelectorProvider pPollSelectorProvider = 42 PlatformRdmaPollSelectorProvider.get(); 43 44 public static SelectorProvider provider() { 45 synchronized (lock) { 46 if (provider != null) 47 return provider; 48 return AccessController.doPrivileged( 49 new PrivilegedAction<>() { 50 public SelectorProvider run() { 51 provider = new RdmaPollSelectorProvider(); 52 return provider; 53 } 54 }); 55 } 56 } 57 58 public AbstractSelector openSelector() throws IOException { 59 return pPollSelectorProvider.openSelector(this); 60 } 61 62 public SocketChannel openSocketChannel() throws IOException { 63 return pPollSelectorProvider.openSocketChannel(this); 64 } 65 66 public ServerSocketChannel openServerSocketChannel() throws IOException { 67 return pPollSelectorProvider.openServerSocketChannel(this); 68 } 69 70 static class PlatformRdmaPollSelectorProvider { 71 72 @SuppressWarnings("unchecked") 73 private static PlatformRdmaPollSelectorProvider newInstance(String cn) { 74 Class<PlatformRdmaPollSelectorProvider> c; 75 try { 76 c = (Class<PlatformRdmaPollSelectorProvider>)Class.forName(cn); 77 return c.getConstructor(new Class<?>[] {}).newInstance(); 78 } catch (ReflectiveOperationException x) { 79 throw new AssertionError(x); 80 } 81 } 82 83 private static PlatformRdmaPollSelectorProvider create() { 84 String osname = AccessController.doPrivileged( 85 new PrivilegedAction<String>() { 86 public String run() { 87 return System.getProperty("os.name"); 88 } 89 }); 90 if ("Linux".equals(osname)) 91 return newInstance("rdma.ch.LinuxRdmaPollSelectorProvider"); 92 return new PlatformRdmaPollSelectorProvider(); 93 } 94 95 private static final PlatformRdmaPollSelectorProvider instance = create(); 96 97 static PlatformRdmaPollSelectorProvider get() { 98 return instance; 99 } 100 101 public AbstractSelector openSelector(RdmaPollSelectorProvider sp) 102 throws IOException { 103 throw new UnsupportedOperationException("unsupported socket operation"); 104 } 105 106 public SocketChannel openSocketChannel(RdmaPollSelectorProvider sp) 107 throws IOException { 108 throw new UnsupportedOperationException("unsupported socket operation"); 109 } 110 111 public ServerSocketChannel openServerSocketChannel(RdmaPollSelectorProvider sp) 112 throws IOException { 113 throw new UnsupportedOperationException("unsupported socket operation"); 114 } 115 } 116 }