| 1 | /* |
| 2 | * Copyright 2006-2007 the original author or authors. |
| 3 | * |
| 4 | * Licensed under the Apache License, Version 2.0 (the "License"); |
| 5 | * you may not use this file except in compliance with the License. |
| 6 | * You may obtain a copy of the License at |
| 7 | * |
| 8 | * http://www.apache.org/licenses/LICENSE-2.0 |
| 9 | * |
| 10 | * Unless required by applicable law or agreed to in writing, software |
| 11 | * distributed under the License is distributed on an "AS IS" BASIS, |
| 12 | * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. |
| 13 | * See the License for the specific language governing permissions and |
| 14 | * limitations under the License. |
| 15 | */ |
| 16 | |
| 17 | package org.springframework.batch.core.resource; |
| 18 | |
| 19 | import java.io.File; |
| 20 | import java.io.IOException; |
| 21 | import java.io.InputStream; |
| 22 | import java.net.URI; |
| 23 | import java.net.URL; |
| 24 | import java.util.Iterator; |
| 25 | import java.util.Properties; |
| 26 | import java.util.Map.Entry; |
| 27 | |
| 28 | import org.springframework.batch.core.JobParameters; |
| 29 | import org.springframework.batch.core.StepExecution; |
| 30 | import org.springframework.batch.core.StepExecutionListener; |
| 31 | import org.springframework.batch.core.converter.DefaultJobParametersConverter; |
| 32 | import org.springframework.batch.core.converter.JobParametersConverter; |
| 33 | import org.springframework.batch.core.listener.StepExecutionListenerSupport; |
| 34 | import org.springframework.context.ResourceLoaderAware; |
| 35 | import org.springframework.core.io.FileSystemResourceLoader; |
| 36 | import org.springframework.core.io.Resource; |
| 37 | import org.springframework.core.io.ResourceLoader; |
| 38 | import org.springframework.util.Assert; |
| 39 | import org.springframework.util.StringUtils; |
| 40 | |
| 41 | /** |
| 42 | * Strategy for locating different resources on the file system. For each unique |
| 43 | * step execution, the same file handle will be returned. A unique step is |
| 44 | * defined as having the same job instance and step name. An external file mover |
| 45 | * (such as an EAI solution) should rename and move any input files to conform |
| 46 | * to the pattern defined here.<br/> |
| 47 | * |
| 48 | * If no pattern is passed in, then following default is used: |
| 49 | * |
| 50 | * <pre> |
| 51 | * data/%JOB_NAME%/%STEP_NAME%.txt |
| 52 | * </pre> |
| 53 | * |
| 54 | * The %% variables are replaced with the corresponding bean property at run |
| 55 | * time, when the factory method is executed. To insert {@link JobParameters} |
| 56 | * use a pattern with the parameter key surrounded by %%, e.g. |
| 57 | * |
| 58 | * <pre> |
| 59 | * //home/jobs/data/%JOB_NAME%/%STEP_NAME%-%schedule.date%.txt |
| 60 | * </pre> |
| 61 | * |
| 62 | * Note that the default pattern does not start with a separator. Because of the |
| 63 | * implementation of the Spring Core Resource abstractions, it would need to |
| 64 | * start with a double forward slash "//" to resolve to an absolute directory |
| 65 | * (or else use a full URL with the file: prefix).<br/> |
| 66 | * |
| 67 | * To use this resource it must be initialised with a {@link StepExecution}. |
| 68 | * The best way to do that is to register it as a listener in the step that is |
| 69 | * going to need it. For this reason the resource implements |
| 70 | * {@link StepExecutionListener}. |
| 71 | * |
| 72 | * @author Tomas Slanina |
| 73 | * @author Lucas Ward |
| 74 | * @author Dave Syer |
| 75 | * |
| 76 | * @see Resource |
| 77 | */ |
| 78 | public class StepExecutionResourceProxy extends StepExecutionListenerSupport implements Resource, ResourceLoaderAware, |
| 79 | StepExecutionListener { |
| 80 | |
| 81 | private static final String JOB_NAME_PATTERN = "%JOB_NAME%"; |
| 82 | |
| 83 | private static final String STEP_NAME_PATTERN = "%STEP_NAME%"; |
| 84 | |
| 85 | private static final String DEFAULT_PATTERN = "data/%JOB_NAME%/" + "%STEP_NAME%.txt"; |
| 86 | |
| 87 | private String filePattern = DEFAULT_PATTERN; |
| 88 | |
| 89 | private JobParametersConverter jobParametersConverter = new DefaultJobParametersConverter(); |
| 90 | |
| 91 | private ResourceLoader resourceLoader = new FileSystemResourceLoader(); |
| 92 | |
| 93 | private Resource delegate; |
| 94 | |
| 95 | /** |
| 96 | * @param relativePath |
| 97 | * @throws IOException |
| 98 | * @see org.springframework.core.io.Resource#createRelative(java.lang.String) |
| 99 | */ |
| 100 | public Resource createRelative(String relativePath) throws IOException { |
| 101 | Assert.state(delegate != null, "The delegate resource has not been initialised. " |
| 102 | + "Remember to register this object as a StepListener."); |
| 103 | return delegate.createRelative(relativePath); |
| 104 | } |
| 105 | |
| 106 | /** |
| 107 | * @see org.springframework.core.io.Resource#exists() |
| 108 | */ |
| 109 | public boolean exists() { |
| 110 | Assert.state(delegate != null, "The delegate resource has not been initialised. " |
| 111 | + "Remember to register this object as a StepListener."); |
| 112 | return delegate.exists(); |
| 113 | } |
| 114 | |
| 115 | /** |
| 116 | * @see org.springframework.core.io.Resource#getDescription() |
| 117 | */ |
| 118 | public String getDescription() { |
| 119 | Assert.state(delegate != null, "The delegate resource has not been initialised. " |
| 120 | + "Remember to register this object as a StepListener."); |
| 121 | return delegate.getDescription(); |
| 122 | } |
| 123 | |
| 124 | /** |
| 125 | * @throws IOException |
| 126 | * @see org.springframework.core.io.Resource#getFile() |
| 127 | */ |
| 128 | public File getFile() throws IOException { |
| 129 | Assert.state(delegate != null, "The delegate resource has not been initialised. " |
| 130 | + "Remember to register this object as a StepListener."); |
| 131 | return delegate.getFile(); |
| 132 | } |
| 133 | |
| 134 | /** |
| 135 | * @see org.springframework.core.io.Resource#getFilename() |
| 136 | */ |
| 137 | public String getFilename() { |
| 138 | Assert.state(delegate != null, "The delegate resource has not been initialised. " |
| 139 | + "Remember to register this object as a StepListener."); |
| 140 | return delegate.getFilename(); |
| 141 | } |
| 142 | |
| 143 | /** |
| 144 | * @throws IOException |
| 145 | * @see org.springframework.core.io.InputStreamSource#getInputStream() |
| 146 | */ |
| 147 | public InputStream getInputStream() throws IOException { |
| 148 | Assert.state(delegate != null, "The delegate resource has not been initialised. " |
| 149 | + "Remember to register this object as a StepListener."); |
| 150 | return delegate.getInputStream(); |
| 151 | } |
| 152 | |
| 153 | /** |
| 154 | * @throws IOException |
| 155 | * @see org.springframework.core.io.Resource#getURI() |
| 156 | */ |
| 157 | public URI getURI() throws IOException { |
| 158 | Assert.state(delegate != null, "The delegate resource has not been initialised. " |
| 159 | + "Remember to register this object as a StepListener."); |
| 160 | return delegate.getURI(); |
| 161 | } |
| 162 | |
| 163 | /** |
| 164 | * @throws IOException |
| 165 | * @see org.springframework.core.io.Resource#getURL() |
| 166 | */ |
| 167 | public URL getURL() throws IOException { |
| 168 | Assert.state(delegate != null, "The delegate resource has not been initialised. " |
| 169 | + "Remember to register this object as a StepListener."); |
| 170 | return delegate.getURL(); |
| 171 | } |
| 172 | |
| 173 | /** |
| 174 | * @see org.springframework.core.io.Resource#isOpen() |
| 175 | */ |
| 176 | public boolean isOpen() { |
| 177 | Assert.state(delegate != null, "The delegate resource has not been initialised. " |
| 178 | + "Remember to register this object as a StepListener."); |
| 179 | return delegate.isOpen(); |
| 180 | } |
| 181 | |
| 182 | /** |
| 183 | * @see org.springframework.core.io.Resource#isReadable() |
| 184 | */ |
| 185 | public boolean isReadable() { |
| 186 | Assert.state(delegate != null, "The delegate resource has not been initialised. " |
| 187 | + "Remember to register this object as a StepListener."); |
| 188 | return delegate.isReadable(); |
| 189 | } |
| 190 | |
| 191 | /** |
| 192 | * Public setter for the {@link JobParametersConverter} used to translate |
| 193 | * {@link JobParameters} into {@link Properties}. Defaults to a |
| 194 | * {@link DefaultJobParametersConverter}. |
| 195 | * @param jobParametersConverter the {@link JobParametersConverter} to set |
| 196 | */ |
| 197 | public void setJobParametersFactory(JobParametersConverter jobParametersConverter) { |
| 198 | this.jobParametersConverter = jobParametersConverter; |
| 199 | } |
| 200 | |
| 201 | /** |
| 202 | * Always false because we are expecting to be step scoped. |
| 203 | * |
| 204 | * @see org.springframework.beans.factory.config.AbstractFactoryBean#isSingleton() |
| 205 | */ |
| 206 | public boolean isSingleton() { |
| 207 | return false; |
| 208 | } |
| 209 | |
| 210 | /* |
| 211 | * (non-Javadoc) |
| 212 | * |
| 213 | * @see org.springframework.context.ResourceLoaderAware#setResourceLoader(org.springframework.core.io.ResourceLoader) |
| 214 | */ |
| 215 | public void setResourceLoader(ResourceLoader resourceLoader) { |
| 216 | this.resourceLoader = resourceLoader; |
| 217 | } |
| 218 | |
| 219 | /** |
| 220 | * helper method for <code>createFileName()</code> |
| 221 | */ |
| 222 | private String replacePattern(String string, String pattern, String replacement) { |
| 223 | |
| 224 | if (string == null) |
| 225 | return null; |
| 226 | |
| 227 | // check to ensure pattern exists in string. |
| 228 | if (string.indexOf(pattern) != -1) { |
| 229 | return StringUtils.replace(string, pattern, replacement); |
| 230 | } |
| 231 | |
| 232 | return string; |
| 233 | } |
| 234 | |
| 235 | /** |
| 236 | * Creates a filename given a pattern and step context information. |
| 237 | * |
| 238 | * Deliberate package access, so that the method can be accessed by unit |
| 239 | * tests |
| 240 | * @param jobName |
| 241 | * @param stepName |
| 242 | * @param properties |
| 243 | */ |
| 244 | private String createFileName(String jobName, String stepName, Properties properties) { |
| 245 | Assert.notNull(filePattern, "filename pattern is null"); |
| 246 | |
| 247 | String fileName = filePattern; |
| 248 | |
| 249 | fileName = replacePattern(fileName, JOB_NAME_PATTERN, jobName == null ? "job" : jobName); |
| 250 | fileName = replacePattern(fileName, STEP_NAME_PATTERN, stepName); |
| 251 | |
| 252 | if (properties != null) { |
| 253 | for (Iterator iterator = properties.entrySet().iterator(); iterator.hasNext();) { |
| 254 | Entry entry = (Entry) iterator.next(); |
| 255 | String key = (String) entry.getKey(); |
| 256 | fileName = replacePattern(fileName, "%" + key + "%", (String) entry.getValue()); |
| 257 | } |
| 258 | } |
| 259 | |
| 260 | return fileName; |
| 261 | } |
| 262 | |
| 263 | public void setFilePattern(String filePattern) { |
| 264 | this.filePattern = replacePattern(filePattern, "\\", File.separator); |
| 265 | } |
| 266 | |
| 267 | /** |
| 268 | * Collect the properties of the enclosing {@link StepExecution} that will |
| 269 | * be needed to create a file name. |
| 270 | * |
| 271 | * @see org.springframework.batch.core.StepExecutionListener#beforeStep(org.springframework.batch.core.StepExecution) |
| 272 | */ |
| 273 | public void beforeStep(StepExecution execution) { |
| 274 | String stepName = execution.getStepName(); |
| 275 | String jobName = execution.getJobExecution().getJobInstance().getJobName(); |
| 276 | Properties properties = jobParametersConverter.getProperties(execution.getJobExecution().getJobInstance() |
| 277 | .getJobParameters()); |
| 278 | delegate = resourceLoader.getResource(createFileName(jobName, stepName, properties)); |
| 279 | } |
| 280 | |
| 281 | /** |
| 282 | * Delegates to the proxied Resource if set, otherwise returns the value of {@link #setFilePattern(String)}. |
| 283 | */ |
| 284 | public String toString() { |
| 285 | return (delegate == null) ? filePattern : delegate.toString(); |
| 286 | } |
| 287 | |
| 288 | } |