1 /* ============================================================
2 * JRobin : Pure java implementation of RRDTool's functionality
3 * ============================================================
4 *
5 * Project Info: http://www.jrobin.org
6 * Project Lead: Sasa Markovic (saxon@jrobin.org);
7 *
8 * (C) Copyright 2003-2005, by Sasa Markovic.
9 *
10 * Developers: Sasa Markovic (saxon@jrobin.org)
11 *
12 *
13 * This library is free software; you can redistribute it and/or modify it under the terms
14 * of the GNU Lesser General Public License as published by the Free Software Foundation;
15 * either version 2.1 of the License, or (at your option) any later version.
16 *
17 * This library is distributed in the hope that it will be useful, but WITHOUT ANY WARRANTY;
18 * without even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.
19 * See the GNU Lesser General Public License for more details.
20 *
21 * You should have received a copy of the GNU Lesser General Public License along with this
22 * library; if not, write to the Free Software Foundation, Inc., 59 Temple Place, Suite 330,
23 * Boston, MA 02111-1307, USA.
24 */
25
26 package org.jrobin.core;
27
28 import java.io.IOException;
29
30 /**
31 * Factory class which creates actual {@link RrdNioBackend} objects. This is the default factory since
32 * 1.4.0 version
33 */
34 public class RrdNioBackendFactory extends RrdFileBackendFactory {
35 /**
36 * factory name, "NIO"
37 */
38 public static final String NAME = "NIO";
39
40 /**
41 * Period in seconds between consecutive synchronizations when
42 * sync-mode is set to SYNC_BACKGROUND. By default in-memory cache will be
43 * transferred to the disc every 300 seconds (5 minutes). Default value can be
44 * changed via {@link #setSyncPeriod(int)} method.
45 */
46 public static final int DEFAULT_SYNC_PERIOD = 300; // seconds
47
48 private static int syncPeriod = DEFAULT_SYNC_PERIOD;
49
50 /**
51 * Returns time between two consecutive background synchronizations. If not changed via
52 * {@link #setSyncPeriod(int)} method call, defaults to {@link #DEFAULT_SYNC_PERIOD}.
53 * See {@link #setSyncPeriod(int)} for more information.
54 *
55 * @return Time in seconds between consecutive background synchronizations.
56 */
57 public static int getSyncPeriod() {
58 return syncPeriod;
59 }
60
61 /**
62 * Sets time between consecutive background synchronizations.
63 *
64 * @param syncPeriod Time in seconds between consecutive background synchronizations.
65 */
66 public static void setSyncPeriod(int syncPeriod) {
67 RrdNioBackendFactory.syncPeriod = syncPeriod;
68 }
69
70 /**
71 * Creates RrdNioBackend object for the given file path.
72 *
73 * @param path File path
74 * @param readOnly True, if the file should be accessed in read/only mode.
75 * False otherwise.
76 * @return RrdNioBackend object which handles all I/O operations for the given file path
77 * @throws IOException Thrown in case of I/O error.
78 */
79 protected RrdBackend open(String path, boolean readOnly) throws IOException {
80 return new RrdNioBackend(path, readOnly, syncPeriod);
81 }
82
83 /**
84 * Returns the name of this factory.
85 *
86 * @return Factory name (equals to string "NIO")
87 */
88 public String getFactoryName() {
89 return NAME;
90 }
91 }
92