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org.apache.commons.configuration.reloading.FileChangedReloadingStrategy |
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1 | /* |
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2 | * Copyright 2001-2005 The Apache Software Foundation. |
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3 | * |
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4 | * Licensed under the Apache License, Version 2.0 (the "License") |
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5 | * you may not use this file except in compliance with the License. |
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6 | * You may obtain a copy of the License at |
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7 | * |
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8 | * http://www.apache.org/licenses/LICENSE-2.0 |
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9 | * |
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10 | * Unless required by applicable law or agreed to in writing, software |
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11 | * distributed under the License is distributed on an "AS IS" BASIS, |
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12 | * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. |
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13 | * See the License for the specific language governing permissions and |
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14 | * limitations under the License. |
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15 | */ |
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16 | ||
17 | package org.apache.commons.configuration.reloading; |
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18 | ||
19 | import org.apache.commons.configuration.FileConfiguration; |
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20 | ||
21 | /** |
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22 | * A reloading strategy that will reload the configuration every time its |
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23 | * underlying file is changed. The file is not reloaded more than once |
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24 | * every 5 seconds by default, this time can be changed by setting the refresh |
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25 | * delay. This strategy only works with FileConfiguration instances. |
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26 | * |
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27 | * @author Emmanuel Bourg |
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28 | * @version $Revision: 155945 $, $Date: 2005-03-02 20:29:39 +0100 (Mi, 02 Mrz 2005) $ |
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29 | * @since 1.1 |
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30 | */ |
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31 | 42 | public class FileChangedReloadingStrategy implements ReloadingStrategy |
32 | { |
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33 | 9 | protected FileConfiguration configuration; |
34 | ||
35 | /** The last time the configuration file was modified. */ |
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36 | protected long lastModified; |
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37 | ||
38 | /** The last time the file was checked for changes. */ |
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39 | protected long lastChecked; |
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40 | ||
41 | /** The minimum delay in milliseconds between checks. */ |
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42 | 42 | protected long refreshDelay = 5000; |
43 | ||
44 | 9 | public void setConfiguration(FileConfiguration configuration) |
45 | { |
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46 | 28 | this.configuration = configuration; |
47 | 28 | } |
48 | 9 | |
49 | 9 | public void init() |
50 | { |
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51 | 28 | updateLastModified(); |
52 | 28 | } |
53 | 9 | |
54 | 9 | public boolean reloadingRequired() |
55 | { |
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56 | 84 | boolean reloading = false; |
57 | ||
58 | 120 | long now = System.currentTimeMillis(); |
59 | ||
60 | 120 | if ((now > lastChecked + refreshDelay) && hasChanged()) |
61 | { |
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62 | 64 | lastChecked = now; |
63 | 28 | reloading = true; |
64 | 18 | } |
65 | 18 | |
66 | 84 | return reloading; |
67 | } |
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68 | 36 | |
69 | public void reloadingPerformed() |
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70 | { |
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71 | 28 | updateLastModified(); |
72 | 28 | } |
73 | 18 | |
74 | 18 | /** |
75 | * Return the minimal time in milliseconds between two reloadings. |
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76 | */ |
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77 | public long getRefreshDelay() |
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78 | { |
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79 | 14 | return refreshDelay; |
80 | } |
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81 | ||
82 | /** |
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83 | * Set the minimal time between two reloadings. |
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84 | * |
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85 | * @param refreshDelay refresh delay in milliseconds |
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86 | */ |
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87 | public void setRefreshDelay(long refreshDelay) |
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88 | { |
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89 | 42 | this.refreshDelay = refreshDelay; |
90 | 42 | } |
91 | ||
92 | /** |
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93 | * Update the last modified time. |
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94 | */ |
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95 | protected void updateLastModified() |
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96 | { |
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97 | 56 | lastModified = configuration.getFile().lastModified(); |
98 | 56 | } |
99 | 27 | |
100 | 27 | /** |
101 | 27 | * Check if the configuration has changed since the last time it was loaded. |
102 | */ |
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103 | protected boolean hasChanged() |
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104 | { |
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105 | 56 | if (!configuration.getFile().exists()) |
106 | { |
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107 | 14 | return false; |
108 | } |
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109 | 18 | |
110 | 42 | return (configuration.getFile().lastModified() > lastModified); |
111 | } |
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112 | ||
113 | } |
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