63 lines
2.5 KiB
Java
63 lines
2.5 KiB
Java
/*
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* Copyright (c) 2007, 2010, 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.FileDescriptor;
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import java.io.IOException;
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import java.nio.channels.SelectableChannel;
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abstract class FileDispatcher extends NativeDispatcher {
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public static final int NO_LOCK = -1; // Failed to lock
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public static final int LOCKED = 0; // Obtained requested lock
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public static final int RET_EX_LOCK = 1; // Obtained exclusive lock
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public static final int INTERRUPTED = 2; // Request interrupted
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abstract int force(FileDescriptor fd, boolean metaData) throws IOException;
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abstract int truncate(FileDescriptor fd, long size) throws IOException;
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abstract long size(FileDescriptor fd) throws IOException;
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abstract int lock(FileDescriptor fd, boolean blocking, long pos, long size,
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boolean shared) throws IOException;
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abstract void release(FileDescriptor fd, long pos, long size)
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throws IOException;
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/**
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* Returns a dup of fd if a file descriptor is required for
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* memory-mapping operations, otherwise returns an invalid
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* FileDescriptor (meaning a newly allocated FileDescriptor)
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*/
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abstract FileDescriptor duplicateForMapping(FileDescriptor fd)
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throws IOException;
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abstract boolean canTransferToDirectly(SelectableChannel sc);
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abstract boolean transferToDirectlyNeedsPositionLock();
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}
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