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org.apache.jcs.auxiliary.disk.jdbc.mysql.MySQLDiskCache |
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1 | package org.apache.jcs.auxiliary.disk.jdbc.mysql; |
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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.io.Serializable; |
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23 | ||
24 | import org.apache.commons.logging.Log; |
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25 | import org.apache.commons.logging.LogFactory; |
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26 | import org.apache.jcs.auxiliary.disk.jdbc.JDBCDiskCache; |
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27 | import org.apache.jcs.auxiliary.disk.jdbc.TableState; |
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28 | import org.apache.jcs.engine.behavior.ICacheElement; |
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29 | ||
30 | /** |
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31 | * The MySQLDiskCache extends the core JDBCDiskCache. |
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32 | * <p> |
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33 | * Although the generic JDBC Disk Cache can be used for MySQL, the MySQL JDBC Disk Cache has |
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34 | * additional features, such as table optimization that are particular to MySQL. |
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35 | * <p> |
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36 | * @author Aaron Smuts |
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37 | */ |
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38 | public class MySQLDiskCache |
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39 | extends JDBCDiskCache |
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40 | { |
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41 | private static final long serialVersionUID = -7169488308515823491L; |
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42 | ||
43 | 28 | private final static Log log = LogFactory.getLog( MySQLDiskCache.class ); |
44 | ||
45 | MySQLDiskCacheAttributes mySQLDiskCacheAttributes; |
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46 | ||
47 | /** |
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48 | * Delegates to the super and makes use of the MySQL specific parameters used for scheduled |
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49 | * optimization. |
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50 | * <p> |
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51 | * @param attributes |
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52 | * @param tableState |
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53 | */ |
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54 | public MySQLDiskCache( MySQLDiskCacheAttributes attributes, TableState tableState ) |
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55 | { |
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56 | 14 | super( attributes, tableState ); |
57 | ||
58 | 14 | mySQLDiskCacheAttributes = attributes; |
59 | ||
60 | 14 | if ( log.isDebugEnabled() ) |
61 | { |
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62 | 0 | log.debug( "MySQLDiskCacheAttributes = " + attributes ); |
63 | } |
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64 | 14 | } |
65 | ||
66 | /** |
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67 | * This delegates to the generic JDBC disk cache. If we are currently optimizing, then this |
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68 | * method will balk and return null. |
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69 | * <p> |
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70 | * @param key Key to locate value for. |
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71 | * @return An object matching key, or null. |
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72 | */ |
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73 | public ICacheElement doGet( Serializable key ) |
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74 | { |
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75 | 224 | if ( this.getTableState().getState() == TableState.OPTIMIZATION_RUNNING ) |
76 | { |
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77 | 7 | if ( this.mySQLDiskCacheAttributes.isBalkDuringOptimization() ) |
78 | { |
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79 | 7 | return null; |
80 | } |
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81 | } |
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82 | 217 | return super.doGet( key ); |
83 | } |
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84 | ||
85 | /** |
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86 | * This delegates to the generic JDBC disk cache. If we are currently optimizing, then this |
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87 | * method will balk and do nothing. |
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88 | * <p> |
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89 | * @param element |
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90 | */ |
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91 | public void doUpdate( ICacheElement element ) |
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92 | { |
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93 | 0 | if ( this.getTableState().getState() == TableState.OPTIMIZATION_RUNNING ) |
94 | { |
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95 | 0 | if ( this.mySQLDiskCacheAttributes.isBalkDuringOptimization() ) |
96 | { |
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97 | 0 | return; |
98 | } |
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99 | } |
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100 | 0 | super.doUpdate( element ); |
101 | 0 | } |
102 | ||
103 | /** |
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104 | * Removed the expired. (now - create time) > max life seconds * 1000 |
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105 | * <p> |
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106 | * If we are currently optimizing, then this method will balk and do nothing. |
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107 | * <p> |
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108 | * TODO consider blocking and trying again. |
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109 | * <p> |
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110 | * @return the number deleted |
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111 | */ |
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112 | protected int deleteExpired() |
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113 | { |
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114 | 0 | if ( this.getTableState().getState() == TableState.OPTIMIZATION_RUNNING ) |
115 | { |
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116 | 0 | if ( this.mySQLDiskCacheAttributes.isBalkDuringOptimization() ) |
117 | { |
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118 | 0 | return -1; |
119 | } |
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120 | } |
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121 | 0 | return super.deleteExpired(); |
122 | } |
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123 | } |
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