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org.apache.turbine.modules.ScheduledJobLoader |
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1 | package org.apache.turbine.modules; |
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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.List; |
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20 | ||
21 | import org.apache.commons.logging.Log; |
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22 | import org.apache.commons.logging.LogFactory; |
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23 | ||
24 | import org.apache.turbine.Turbine; |
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25 | import org.apache.turbine.TurbineConstants; |
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26 | import org.apache.turbine.services.assemblerbroker.AssemblerBrokerService; |
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27 | import org.apache.turbine.services.assemblerbroker.TurbineAssemblerBroker; |
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28 | import org.apache.turbine.services.schedule.JobEntry; |
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29 | import org.apache.turbine.util.ObjectUtils; |
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30 | import org.apache.turbine.util.RunData; |
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31 | ||
32 | /** |
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33 | * ScheduledJobs loader class. |
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34 | * |
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35 | * @author <a href="mailto:mbryson@mindspring.com">Dave Bryson</a> |
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36 | * @author <a href="mailto:hps@intermeta.de">Henning P. Schmiedehausen</a> |
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37 | * @version $Id: ScheduledJobLoader.java,v 1.7.2.3 2004/08/16 22:57:50 henning Exp $ |
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38 | */ |
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39 | public class ScheduledJobLoader |
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40 | extends GenericLoader |
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41 | { |
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42 | /** Logging */ |
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43 | 0 | private static Log log = LogFactory.getLog(ScheduledJobLoader.class); |
44 | ||
45 | /** The single instance of this class. */ |
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46 | 0 | private static ScheduledJobLoader instance = |
47 | new ScheduledJobLoader(Turbine.getConfiguration() |
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48 | .getInt(TurbineConstants.SCHEDULED_JOB_CACHE_SIZE_KEY, |
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49 | TurbineConstants.SCHEDULED_JOB_CACHE_SIZE_DEFAULT)); |
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50 | ||
51 | /** The Assembler Broker Service */ |
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52 | 0 | private static AssemblerBrokerService ab = TurbineAssemblerBroker.getService(); |
53 | ||
54 | /** |
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55 | * These ctor's are private to force clients to use getInstance() |
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56 | * to access this class. |
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57 | */ |
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58 | private ScheduledJobLoader() |
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59 | { |
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60 | 0 | super(); |
61 | 0 | } |
62 | ||
63 | /** |
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64 | * These ctor's are private to force clients to use getInstance() |
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65 | * to access this class. |
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66 | */ |
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67 | private ScheduledJobLoader(int i) |
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68 | { |
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69 | 0 | super(i); |
70 | 0 | } |
71 | ||
72 | /** |
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73 | * Adds an instance of an object into the hashtable. |
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74 | * |
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75 | * @param name Name of object. |
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76 | * @param job Job to be associated with name. |
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77 | */ |
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78 | private void addInstance(String name, ScheduledJob job) |
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79 | { |
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80 | 0 | if (cache()) |
81 | { |
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82 | 0 | this.put(name, (ScheduledJob) job); |
83 | } |
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84 | 0 | } |
85 | ||
86 | /** |
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87 | * Attempts to load and execute the external ScheduledJob. |
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88 | * |
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89 | * @param job The JobEntry. |
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90 | * @param name Name of object that will execute the job. |
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91 | * @exception Exception a generic exception. |
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92 | */ |
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93 | public void exec(JobEntry job, String name) |
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94 | throws Exception |
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95 | { |
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96 | // Execute job |
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97 | 0 | getInstance(name).run(job); |
98 | 0 | } |
99 | ||
100 | /** |
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101 | * Attempts to load and execute the external ScheduledJob. |
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102 | * |
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103 | * HELP! - THIS IS UGLY! |
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104 | * |
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105 | * I want the cache stuff from GenericLoader, BUT, I don't think |
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106 | * the scheduler needs the Rundata object. The scheduler runs |
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107 | * independently of an HTTP request. This should not extend |
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108 | * GenericLoader! Thoughts?? |
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109 | * |
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110 | * @param data Turbine information. |
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111 | * @param name Name of object that will execute the job. |
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112 | * @exception Exception a generic exception. |
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113 | */ |
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114 | public void exec(RunData data, String name) |
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115 | throws Exception |
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116 | { |
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117 | 0 | throw new Exception("RunData objects not accepted for Scheduled jobs"); |
118 | } |
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119 | ||
120 | /** |
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121 | * Pulls out an instance of the object by name. Name is just the |
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122 | * single name of the object. |
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123 | * |
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124 | * @param name Name of object instance. |
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125 | * @return An ScheduledJob with the specified name, or null. |
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126 | * @exception Exception a generic exception. |
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127 | */ |
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128 | public ScheduledJob getInstance(String name) |
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129 | throws Exception |
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130 | { |
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131 | 0 | ScheduledJob job = null; |
132 | ||
133 | // Check if the screen is already in the cache |
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134 | 0 | if (cache() && this.containsKey(name)) |
135 | { |
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136 | 0 | job = (ScheduledJob) this.get(name); |
137 | 0 | log.debug("Found Job " + name + " in the cache!"); |
138 | } |
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139 | else |
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140 | { |
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141 | 0 | log.debug("Loading Job " + name + " from the Assembler Broker"); |
142 | ||
143 | try |
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144 | { |
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145 | 0 | if (ab != null) |
146 | { |
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147 | // Attempt to load the job |
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148 | 0 | job = (ScheduledJob) ab.getAssembler( |
149 | AssemblerBrokerService.SCHEDULEDJOB_TYPE, name); |
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150 | } |
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151 | } |
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152 | 0 | catch (ClassCastException cce) |
153 | { |
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154 | // This can alternatively let this exception be thrown |
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155 | // So that the ClassCastException is shown in the |
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156 | // browser window. Like this it shows "Screen not Found" |
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157 | 0 | job = null; |
158 | 0 | } |
159 | ||
160 | 0 | if (job == null) |
161 | { |
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162 | // If we did not find a screen we should try and give |
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163 | // the user a reason for that... |
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164 | // FIX ME: The AssemblerFactories should each add it's |
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165 | // own string here... |
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166 | 0 | List packages = Turbine.getConfiguration() |
167 | .getList(TurbineConstants.MODULE_PACKAGES); |
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168 | ||
169 | 0 | ObjectUtils.addOnce(packages, GenericLoader.getBasePackage()); |
170 | ||
171 | 0 | throw new ClassNotFoundException( |
172 | "\n\n\tRequested ScheduledJob not found: " + name + |
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173 | "\n\tTurbine looked in the following " + |
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174 | "modules.packages path: \n\t" + packages.toString() + "\n"); |
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175 | } |
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176 | 0 | else if (cache()) |
177 | { |
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178 | // The new instance is added to the cache |
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179 | 0 | addInstance(name, job); |
180 | } |
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181 | } |
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182 | 0 | return job; |
183 | } |
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184 | ||
185 | /** |
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186 | * The method through which this class is accessed. |
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187 | * |
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188 | * @return The single instance of this class. |
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189 | */ |
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190 | public static ScheduledJobLoader getInstance() |
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191 | { |
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192 | 0 | return instance; |
193 | } |
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194 | } |
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