1/* 2 * Copyright (c) 2001, 2009, 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 26package sun.nio.ch; 27 28import java.io.IOException; 29import java.nio.channels.*; 30 31public class FileLockImpl 32 extends FileLock 33{ 34 private volatile boolean valid = true; 35 36 FileLockImpl(FileChannel channel, long position, long size, boolean shared) 37 { 38 super(channel, position, size, shared); 39 } 40 41 FileLockImpl(AsynchronousFileChannel channel, long position, long size, boolean shared) 42 { 43 super(channel, position, size, shared); 44 } 45 46 public boolean isValid() { 47 return valid; 48 } 49 50 void invalidate() { 51 assert Thread.holdsLock(this); 52 valid = false; 53 } 54 55 public synchronized void release() throws IOException { 56 Channel ch = acquiredBy(); 57 if (!ch.isOpen()) 58 throw new ClosedChannelException(); 59 if (valid) { 60 if (ch instanceof FileChannelImpl) 61 ((FileChannelImpl)ch).release(this); 62 else if (ch instanceof AsynchronousFileChannelImpl) 63 ((AsynchronousFileChannelImpl)ch).release(this); 64 else throw new AssertionError(); 65 valid = false; 66 } 67 } 68} 69