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org.apache.jcs.auxiliary.disk.jdbc.ShrinkerThread |
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1 | package org.apache.jcs.auxiliary.disk.jdbc; |
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2 | ||
3 | /* |
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4 | * Licensed to the Apache Software Foundation (ASF) under one |
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5 | * or more contributor license agreements. See the NOTICE file |
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6 | * distributed with this work for additional information |
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7 | * regarding copyright ownership. The ASF licenses this file |
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8 | * to you under the Apache License, Version 2.0 (the |
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9 | * "License"); you may not use this file except in compliance |
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10 | * with the License. You may obtain a copy of the License at |
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11 | * |
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12 | * http://www.apache.org/licenses/LICENSE-2.0 |
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13 | * |
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14 | * Unless required by applicable law or agreed to in writing, |
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15 | * software distributed under the License is distributed on an |
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16 | * "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY |
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17 | * KIND, either express or implied. See the License for the |
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18 | * specific language governing permissions and limitations |
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19 | * under the License. |
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20 | */ |
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21 | ||
22 | import java.util.Collections; |
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23 | import java.util.HashSet; |
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24 | import java.util.Set; |
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25 | ||
26 | import org.apache.commons.logging.Log; |
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27 | import org.apache.commons.logging.LogFactory; |
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28 | ||
29 | /** |
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30 | * Calls delete expired on the disk caches. The shrinker is run by a clock daemon. The shrinker |
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31 | * calls delete on each region. It pauses between calls. |
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32 | * <p> |
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33 | * @author Aaron Smuts |
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34 | */ |
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35 | public class ShrinkerThread |
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36 | implements Runnable |
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37 | { |
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38 | /** The logger. */ |
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39 | 56 | private final static Log log = LogFactory.getLog( ShrinkerThread.class ); |
40 | ||
41 | /** A set of JDBCDiskCache objects to call deleteExpired on. */ |
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42 | 28 | private Set shrinkSet = Collections.synchronizedSet( new HashSet() ); |
43 | ||
44 | /** |
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45 | * Default time period to use. |
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46 | */ |
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47 | private static final long DEFAULT_PAUSE_BETWEEN_REGION_CALLS_MILLIS = 5000; |
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48 | ||
49 | /** |
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50 | * How long should we wait between calls to deleteExpired when we are iterating through the list |
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51 | * of regions. Delete can lock the table. We want to give clients a chance to get some work |
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52 | * done. |
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53 | */ |
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54 | 28 | private long pauseBetweenRegionCallsMillis = DEFAULT_PAUSE_BETWEEN_REGION_CALLS_MILLIS; |
55 | ||
56 | /** |
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57 | * Does nothing special. |
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58 | * <p> |
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59 | * @param diskCache |
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60 | */ |
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61 | protected ShrinkerThread() |
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62 | { |
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63 | 28 | super(); |
64 | 28 | } |
65 | ||
66 | /** |
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67 | * Adds a JDBC disk cache to the set of disk cache to shrink. |
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68 | * <p> |
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69 | * @param diskCache |
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70 | */ |
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71 | public void addDiskCacheToShrinkList( JDBCDiskCache diskCache ) |
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72 | { |
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73 | // the set will prevent dupes. |
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74 | // we could also just add these to a hasmap by region name |
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75 | // but that might cause a problem if you wanted to use two different |
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76 | // jbdc disk caches for the same region. |
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77 | 42 | shrinkSet.add( diskCache ); |
78 | 42 | } |
79 | ||
80 | /** |
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81 | * Calls deleteExpired on each item in the set. It pauses between each call. |
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82 | */ |
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83 | public void run() |
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84 | { |
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85 | 13 | if ( log.isInfoEnabled() ) |
86 | { |
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87 | 13 | log.info( "Running JDBC disk cache shrinker. Number of regions [" + shrinkSet.size() + "]" ); |
88 | } |
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89 | ||
90 | 13 | Object[] caches = null; |
91 | ||
92 | 13 | synchronized ( shrinkSet ) |
93 | { |
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94 | 13 | caches = this.shrinkSet.toArray(); |
95 | 13 | } |
96 | ||
97 | 13 | if ( caches != null ) |
98 | { |
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99 | 32 | for ( int i = 0; i < caches.length; i++ ) |
100 | { |
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101 | 26 | JDBCDiskCache cache = (JDBCDiskCache) caches[i]; |
102 | ||
103 | 26 | long start = System.currentTimeMillis(); |
104 | 26 | int deleted = cache.deleteExpired(); |
105 | 26 | long end = System.currentTimeMillis(); |
106 | ||
107 | 26 | if ( log.isInfoEnabled() ) |
108 | { |
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109 | 26 | log.info( "Deleted [" + deleted + "] expired for region [" + cache.getCacheName() + "] for table [" |
110 | + cache.getTableName() + "] in " + ( end - start ) + " ms." ); |
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111 | } |
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112 | ||
113 | // don't pause after the last call to delete expired. |
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114 | 26 | if ( i < caches.length - 1 ) |
115 | { |
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116 | 20 | if ( log.isInfoEnabled() ) |
117 | { |
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118 | 20 | log.info( "Pausing for [" + this.getPauseBetweenRegionCallsMillis() |
119 | + "] ms. before shinker the next region." ); |
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120 | } |
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121 | ||
122 | try |
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123 | { |
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124 | 20 | Thread.sleep( this.getPauseBetweenRegionCallsMillis() ); |
125 | } |
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126 | 0 | catch ( InterruptedException e ) |
127 | { |
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128 | 0 | log.warn( "Interrupted while waiting to delete expired for the enxt region." ); |
129 | 13 | } |
130 | } |
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131 | } |
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132 | } |
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133 | 6 | } |
134 | ||
135 | /** |
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136 | * How long should we wait between calls to deleteExpired when we are iterating through the list |
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137 | * of regions. |
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138 | * <p> |
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139 | * @param pauseBetweenRegionCallsMillis The pauseBetweenRegionCallsMillis to set. |
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140 | */ |
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141 | public void setPauseBetweenRegionCallsMillis( long pauseBetweenRegionCallsMillis ) |
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142 | { |
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143 | 0 | this.pauseBetweenRegionCallsMillis = pauseBetweenRegionCallsMillis; |
144 | 0 | } |
145 | ||
146 | /** |
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147 | * How long should we wait between calls to deleteExpired when we are iterating through the list |
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148 | * of regions. |
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149 | * <p> |
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150 | * @return Returns the pauseBetweenRegionCallsMillis. |
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151 | */ |
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152 | public long getPauseBetweenRegionCallsMillis() |
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153 | { |
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154 | 40 | return pauseBetweenRegionCallsMillis; |
155 | } |
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156 | } |
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