69 lines
2.3 KiB
Java
69 lines
2.3 KiB
Java
/*
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* Copyright (c) 2001, 2009, Oracle and/or its affiliates. All rights reserved.
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* DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
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*
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* This code is free software; you can redistribute it and/or modify it
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* under the terms of the GNU General Public License version 2 only, as
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* published by the Free Software Foundation. Oracle designates this
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* particular file as subject to the "Classpath" exception as provided
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* by Oracle in the LICENSE file that accompanied this code.
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*
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* This code is distributed in the hope that it will be useful, but WITHOUT
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* ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
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* FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
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* version 2 for more details (a copy is included in the LICENSE file that
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* accompanied this code).
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*
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* You should have received a copy of the GNU General Public License version
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* 2 along with this work; if not, write to the Free Software Foundation,
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* Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
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*
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* Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
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* or visit www.oracle.com if you need additional information or have any
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* questions.
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*/
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package sun.nio.ch;
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import java.io.IOException;
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import java.nio.channels.*;
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public class FileLockImpl
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extends FileLock
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{
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private volatile boolean invalid;
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FileLockImpl(FileChannel channel, long position, long size, boolean shared)
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{
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super(channel, position, size, shared);
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}
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FileLockImpl(AsynchronousFileChannel channel, long position, long size, boolean shared)
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{
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super(channel, position, size, shared);
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}
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public boolean isValid() {
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return !invalid;
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}
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void invalidate() {
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assert Thread.holdsLock(this);
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invalid = true;
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}
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public synchronized void release() throws IOException {
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Channel ch = acquiredBy();
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if (!ch.isOpen())
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throw new ClosedChannelException();
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if (isValid()) {
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if (ch instanceof FileChannelImpl)
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((FileChannelImpl)ch).release(this);
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else if (ch instanceof AsynchronousFileChannelImpl)
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((AsynchronousFileChannelImpl)ch).release(this);
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else throw new AssertionError();
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invalidate();
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}
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}
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}
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