1 /* 2 * Copyright (c) 2019, 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.misc; 27 28 import java.lang.invoke.MethodHandle; 29 import java.lang.invoke.MethodHandles; 30 import java.lang.invoke.MethodType; 31 import java.nio.channels.FileChannel.MapMode; 32 33 /** 34 * JDK-specific map modes implemented in java.base. 35 */ 36 public class ExtendedMapMode { 37 38 static final MethodHandle MAP_MODE_CONSTRUCTOR; 39 40 static { 41 try { 42 var lookup = MethodHandles.privateLookupIn(MapMode.class, MethodHandles.lookup()); 43 var methodType = MethodType.methodType(void.class, String.class); 44 MAP_MODE_CONSTRUCTOR = lookup.findConstructor(MapMode.class, methodType); 45 } catch (Exception e) { 46 throw new InternalError(e); 47 } 48 } 49 50 public static final MapMode READ_ONLY_SYNC = newMapMode("READ_ONLY_SYNC"); 51 52 public static final MapMode READ_WRITE_SYNC = newMapMode("READ_WRITE_SYNC"); 53 54 private static MapMode newMapMode(String name) { 55 try { 56 return (MapMode) MAP_MODE_CONSTRUCTOR.invoke(name); 57 } catch (Throwable e) { 58 throw new InternalError(e); 59 } 60 } 61 62 private ExtendedMapMode() { } 63 }