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();
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1 /*
2 * Copyright (c) 2007, 2016, 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 int allocate(FileDescriptor fd, long size) throws IOException;
44
45 abstract long size(FileDescriptor fd) throws IOException;
46
47 abstract int lock(FileDescriptor fd, boolean blocking, long pos, long size,
48 boolean shared) throws IOException;
49
50 abstract void release(FileDescriptor fd, long pos, long size)
51 throws IOException;
52
53 /**
54 * Returns a dup of fd if a file descriptor is required for
55 * memory-mapping operations, otherwise returns an invalid
56 * FileDescriptor (meaning a newly allocated FileDescriptor)
57 */
58 abstract FileDescriptor duplicateForMapping(FileDescriptor fd)
59 throws IOException;
60
61 abstract boolean canTransferToDirectly(SelectableChannel sc);
62
63 abstract boolean transferToDirectlyNeedsPositionLock();
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