1 /* 2 * Copyright (c) 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 jdk.internal.net.rdma; 27 28 import java.io.IOException; 29 import java.net.ProtocolFamily; 30 import java.nio.channels.ServerSocketChannel; 31 import java.nio.channels.SocketChannel; 32 import java.nio.channels.spi.AbstractSelector; 33 import java.nio.channels.spi.SelectorProvider; 34 import sun.nio.ch.SelectorProviderImpl; 35 import java.security.AccessController; 36 import java.security.PrivilegedAction; 37 38 public class RdmaPollSelectorProvider 39 extends SelectorProviderImpl 40 { 41 private static final Object lock = new Object(); 42 private static SelectorProvider provider = null; 43 44 private static PlatformRdmaPollSelectorProvider pPollSelectorProvider = 45 PlatformRdmaPollSelectorProvider.get(); 46 47 public static SelectorProvider provider() { 48 synchronized (lock) { 49 if (provider != null) 50 return provider; 51 return AccessController.doPrivileged( 52 new PrivilegedAction<>() { 53 public SelectorProvider run() { 54 provider = new RdmaPollSelectorProvider(); 55 return provider; 56 } 57 }); 58 } 59 } 60 61 public AbstractSelector openSelector() throws IOException { 62 return pPollSelectorProvider.openSelector(this); 63 } 64 65 public SocketChannel openSocketChannel(ProtocolFamily family) 66 throws IOException { 67 return pPollSelectorProvider.openSocketChannel(this, family); 68 } 69 70 public ServerSocketChannel openServerSocketChannel(ProtocolFamily family) 71 throws IOException { 72 return pPollSelectorProvider.openServerSocketChannel(this, family); 73 } 74 75 static class PlatformRdmaPollSelectorProvider { 76 77 @SuppressWarnings("unchecked") 78 private static PlatformRdmaPollSelectorProvider newInstance(String cn) { 79 Class<PlatformRdmaPollSelectorProvider> c; 80 try { 81 c = (Class<PlatformRdmaPollSelectorProvider>)Class.forName(cn); 82 return c.getConstructor(new Class<?>[] {}).newInstance(); 83 } catch (ReflectiveOperationException x) { 84 throw new AssertionError(x); 85 } 86 } 87 88 private static PlatformRdmaPollSelectorProvider create() { 89 String osname = AccessController.doPrivileged( 90 new PrivilegedAction<String>() { 91 public String run() { 92 return System.getProperty("os.name"); 93 } 94 }); 95 if ("Linux".equals(osname)) 96 return newInstance( 97 "jdk.internal.net.rdma.LinuxRdmaPollSelectorProvider"); 98 return new PlatformRdmaPollSelectorProvider(); 99 } 100 101 private static final PlatformRdmaPollSelectorProvider instance = create(); 102 103 static PlatformRdmaPollSelectorProvider get() { 104 return instance; 105 } 106 107 public AbstractSelector openSelector(RdmaPollSelectorProvider sp) 108 throws IOException { 109 throw new UnsupportedOperationException( 110 "unsupported socket operation"); 111 } 112 113 public SocketChannel openSocketChannel(RdmaPollSelectorProvider sp, 114 ProtocolFamily family) 115 throws IOException { 116 throw new UnsupportedOperationException( 117 "unsupported socket operation"); 118 } 119 120 public ServerSocketChannel openServerSocketChannel(RdmaPollSelectorProvider sp, 121 ProtocolFamily family) 122 throws IOException { 123 throw new UnsupportedOperationException( 124 "unsupported socket operation"); 125 } 126 } 127 }