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org.apache.turbine.om.OMTool$PullHelper |
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1 | package org.apache.turbine.om; |
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2 | ||
3 | /* |
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4 | * Copyright 2001-2004 The Apache Software Foundation. |
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5 | * |
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6 | * Licensed under the Apache License, Version 2.0 (the "License") |
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7 | * you may not use this file except in compliance with the License. |
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8 | * You may obtain a copy of the License at |
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9 | * |
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10 | * http://www.apache.org/licenses/LICENSE-2.0 |
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11 | * |
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12 | * Unless required by applicable law or agreed to in writing, software |
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13 | * distributed under the License is distributed on an "AS IS" BASIS, |
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14 | * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. |
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15 | * See the License for the specific language governing permissions and |
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16 | * limitations under the License. |
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17 | */ |
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18 | ||
19 | import java.util.HashMap; |
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20 | import java.util.Map; |
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21 | ||
22 | import org.apache.turbine.Turbine; |
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23 | import org.apache.turbine.services.pull.ApplicationTool; |
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24 | import org.apache.turbine.util.pool.Recyclable; |
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25 | ||
26 | /** |
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27 | * A Pull tool to make om objects available to a template |
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28 | * |
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29 | * @author <a href="mailto:jmcnally@collab.net">John D. McNally</a> |
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30 | * @author <a href="mailto:hps@intermeta.de">Henning P. Schmiedehausen</a> |
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31 | * @version $Id: OMTool.java,v 1.4.2.2 2004/05/20 03:05:19 seade Exp $ |
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32 | */ |
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33 | public class OMTool implements ApplicationTool, Recyclable |
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34 | { |
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35 | // private RunData data; |
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36 | private HashMap omMap; |
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37 | ||
38 | // note the following could be a static attribute to reduce memory |
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39 | // footprint. Might require a service to front load the |
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40 | // PullHelpers to avoid MT issues. A multiple write is not so bad |
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41 | // though |
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42 | ||
43 | /** The cache of PullHelpers. **/ |
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44 | private static Map pullMap = new HashMap(); |
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45 | ||
46 | /** |
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47 | * The Factory responsible for retrieving the |
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48 | * objects from storage |
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49 | */ |
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50 | private RetrieverFactory omFactory; |
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51 | ||
52 | public OMTool()throws Exception |
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53 | { |
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54 | omMap = new HashMap(); |
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55 | String className = Turbine.getConfiguration() |
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56 | .getString("tool.om.factory"); |
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57 | // RetrieverFactory omFactory = |
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58 | // (RetrieverFactory)Class.forName(className).newInstance(); |
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59 | } |
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60 | ||
61 | /** |
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62 | * Prepares tool for a single request |
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63 | */ |
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64 | public void init(Object runData) |
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65 | { |
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66 | // data = (RunData)runData; |
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67 | } |
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68 | ||
69 | /** |
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70 | * Implementation of ApplicationTool interface is not needed for this |
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71 | * method as the tool is request scoped |
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72 | */ |
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73 | public void refresh() |
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74 | { |
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75 | // empty |
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76 | } |
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77 | ||
78 | /** |
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79 | * Inner class to present a nice interface to the template designer |
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80 | */ |
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81 | 0 | private class PullHelper |
82 | { |
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83 | String omName; |
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84 | ||
85 | private PullHelper(String omName) |
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86 | 0 | { |
87 | 0 | this.omName = omName; |
88 | 0 | } |
89 | ||
90 | public Object setKey(String key) |
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91 | throws Exception |
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92 | { |
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93 | 0 | Object om = null; |
94 | ||
95 | 0 | String inputKey = omName + key; |
96 | 0 | if (omMap.containsKey(inputKey)) |
97 | { |
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98 | 0 | om = omMap.get(inputKey); |
99 | } |
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100 | else |
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101 | { |
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102 | 0 | om = omFactory.getInstance(omName).retrieve(key); |
103 | 0 | omMap.put(inputKey, om); |
104 | } |
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105 | ||
106 | 0 | return om; |
107 | } |
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108 | } |
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109 | ||
110 | public Object get(String omName) throws Exception |
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111 | { |
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112 | if (!pullMap.containsKey(omName)) |
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113 | { |
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114 | // MT could overwrite a PullHelper, but that is not a problem |
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115 | // should still synchronize to avoid two threads adding at |
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116 | // same time |
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117 | synchronized (this.getClass()) |
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118 | { |
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119 | pullMap.put(omName, new OMTool.PullHelper(omName)); |
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120 | } |
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121 | } |
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122 | ||
123 | return pullMap.get(omName); |
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124 | } |
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125 | ||
126 | public Object get(String omName, String key) throws Exception |
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127 | { |
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128 | return ((OMTool.PullHelper) get(omName)).setKey(key); |
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129 | } |
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130 | ||
131 | ||
132 | public String getName() |
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133 | { |
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134 | return "om"; |
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135 | } |
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136 | ||
137 | ||
138 | // ****************** Recyclable implementation ************************ |
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139 | ||
140 | private boolean disposed; |
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141 | ||
142 | /** |
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143 | * Recycles the object for a new client. Recycle methods with |
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144 | * parameters must be added to implementing object and they will be |
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145 | * automatically called by pool implementations when the object is |
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146 | * taken from the pool for a new client. The parameters must |
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147 | * correspond to the parameters of the constructors of the object. |
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148 | * For new objects, constructors can call their corresponding recycle |
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149 | * methods whenever applicable. |
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150 | * The recycle methods must call their super. |
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151 | */ |
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152 | public void recycle() |
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153 | { |
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154 | disposed = false; |
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155 | } |
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156 | ||
157 | /** |
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158 | * Disposes the object after use. The method is called |
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159 | * when the object is returned to its pool. |
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160 | * The dispose method must call its super. |
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161 | */ |
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162 | public void dispose() |
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163 | { |
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164 | omMap.clear(); |
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165 | // data = null; |
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166 | disposed = true; |
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167 | } |
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168 | ||
169 | /** |
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170 | * Checks whether the recyclable has been disposed. |
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171 | * @return true, if the recyclable is disposed. |
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172 | */ |
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173 | public boolean isDisposed() |
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174 | { |
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175 | return disposed; |
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176 | } |
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177 | } |
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178 | ||
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