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
30
31 /**
32 * Defines <em>extended</em> open options supported on some platforms
33 * by Sun's provider implementation.
34 *
35 * @since 1.7
36 */
37
38 public enum ExtendedOpenOption implements OpenOption {
39 /**
40 * Prevent operations on the file that request read access.
41 */
42 NOSHARE_READ(ExtendedOptions.NOSHARE_READ),
43 /**
44 * Prevent operations on the file that request write access.
45 */
46 NOSHARE_WRITE(ExtendedOptions.NOSHARE_WRITE),
47 /**
48 * Prevent operations on the file that request delete access.
49 */
50 NOSHARE_DELETE(ExtendedOptions.NOSHARE_DELETE);
51
52 ExtendedOpenOption(ExtendedOptions.InternalOption<Void> option) {
53 option.register(this);
54 }
55 }
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1 /*
2 * Copyright (c) 2007, 2017, 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
30
31 /**
32 * Defines <em>extended</em> open options supported on some platforms
33 * by Sun's provider implementation.
34 *
35 * @since 1.7
36 */
37
38 public enum ExtendedOpenOption implements OpenOption {
39 /**
40 * Prevent operations on the file that request read access.
41 */
42 NOSHARE_READ(ExtendedOptions.NOSHARE_READ),
43 /**
44 * Prevent operations on the file that request write access.
45 */
46 NOSHARE_WRITE(ExtendedOptions.NOSHARE_WRITE),
47 /**
48 * Prevent operations on the file that request delete access.
49 */
50 NOSHARE_DELETE(ExtendedOptions.NOSHARE_DELETE),
51
52 /**
53 * Requires that direct I/O be used for read or write access.
54 * Attempting to open a file with this option set will result in
55 * an {@code UnsupportedOperationException} if the operating system or
56 * file system does not support Direct I/O or a sufficient equivalent.
57 *
58 * @apiNote
59 * The DIRECT option enables performing file I/O directly between user
60 * buffers and the file thereby circumventing the operating system page
61 * cache and possibly avoiding the thrashing which could otherwise occur
62 * in I/O-intensive applications. This option may be of benefit to
63 * applications which do their own caching or do random I/O operations
64 * on large data sets. It is likely to provide the most benefit when
65 * the file is stored on a device which has high I/O throughput capacity.
66 * The option should be used with caution however as in general it is
67 * likely to degrade performance. The performance effects of using it
68 * should be evaluated in each particular circumstance.
69 *
70 * @since 10
71 */
72 DIRECT(ExtendedOptions.DIRECT);
73
74 ExtendedOpenOption(ExtendedOptions.InternalOption<Void> option) {
75 option.register(this);
76 }
77 }
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