1 /* 2 * Copyright (c) 2007, 2010, 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 sun.nio.ch; 27 28 import java.io.FileDescriptor; 29 import java.io.IOException; 30 import java.nio.channels.SelectableChannel; 31 32 abstract class FileDispatcher extends NativeDispatcher { 33 34 public static final int NO_LOCK = -1; // Failed to lock 35 public static final int LOCKED = 0; // Obtained requested lock 36 public static final int RET_EX_LOCK = 1; // Obtained exclusive lock 37 public static final int INTERRUPTED = 2; // Request interrupted 38 39 abstract int force(FileDescriptor fd, boolean metaData) throws IOException; 40 41 abstract int truncate(FileDescriptor fd, long size) throws IOException; 42 43 abstract long size(FileDescriptor fd) throws IOException; 44 45 abstract int lock(FileDescriptor fd, boolean blocking, long pos, long size, 46 boolean shared) throws IOException; 47 48 abstract void release(FileDescriptor fd, long pos, long size) 49 throws IOException; 50 51 /** 52 * Returns a dup of fd if a file descriptor is required for 53 * memory-mapping operations, otherwise returns an invalid 54 * FileDescriptor (meaning a newly allocated FileDescriptor) 55 */ 56 abstract FileDescriptor duplicateForMapping(FileDescriptor fd) 57 throws IOException; 58 59 abstract boolean canTransferToDirectly(SelectableChannel sc); 60 61 abstract boolean transferToDirectlyNeedsPositionLock(); 62 } 63
