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 | * @see org.springframework.core.io.Resource#lastModified() |
193 | */ |
194 | public long lastModified() throws IOException { |
195 | Assert.state(delegate != null, "The delegate resource has not been initialised. " |
196 | + "Remember to register this object as a StepListener."); |
197 | return delegate.lastModified(); |
198 | } |
199 | |
200 | /** |
201 | * Public setter for the {@link JobParametersConverter} used to translate |
202 | * {@link JobParameters} into {@link Properties}. Defaults to a |
203 | * {@link DefaultJobParametersConverter}. |
204 | * @param jobParametersConverter the {@link JobParametersConverter} to set |
205 | */ |
206 | public void setJobParametersFactory(JobParametersConverter jobParametersConverter) { |
207 | this.jobParametersConverter = jobParametersConverter; |
208 | } |
209 | |
210 | /** |
211 | * Always false because we are expecting to be step scoped. |
212 | * |
213 | * @see org.springframework.beans.factory.config.AbstractFactoryBean#isSingleton() |
214 | */ |
215 | public boolean isSingleton() { |
216 | return false; |
217 | } |
218 | |
219 | /* |
220 | * (non-Javadoc) |
221 | * |
222 | * @see org.springframework.context.ResourceLoaderAware#setResourceLoader(org.springframework.core.io.ResourceLoader) |
223 | */ |
224 | public void setResourceLoader(ResourceLoader resourceLoader) { |
225 | this.resourceLoader = resourceLoader; |
226 | } |
227 | |
228 | /** |
229 | * helper method for <code>createFileName()</code> |
230 | */ |
231 | private String replacePattern(String string, String pattern, String replacement) { |
232 | |
233 | if (string == null) |
234 | return null; |
235 | |
236 | // check to ensure pattern exists in string. |
237 | if (string.indexOf(pattern) != -1) { |
238 | return StringUtils.replace(string, pattern, replacement); |
239 | } |
240 | |
241 | return string; |
242 | } |
243 | |
244 | /** |
245 | * Creates a filename given a pattern and step context information. |
246 | * |
247 | * Deliberate package access, so that the method can be accessed by unit |
248 | * tests |
249 | * @param jobName |
250 | * @param stepName |
251 | * @param properties |
252 | */ |
253 | private String createFileName(String jobName, String stepName, Properties properties) { |
254 | Assert.notNull(filePattern, "filename pattern is null"); |
255 | |
256 | String fileName = filePattern; |
257 | |
258 | fileName = replacePattern(fileName, JOB_NAME_PATTERN, jobName == null ? "job" : jobName); |
259 | fileName = replacePattern(fileName, STEP_NAME_PATTERN, stepName); |
260 | |
261 | if (properties != null) { |
262 | for (Iterator iterator = properties.entrySet().iterator(); iterator.hasNext();) { |
263 | Entry entry = (Entry) iterator.next(); |
264 | String key = (String) entry.getKey(); |
265 | fileName = replacePattern(fileName, "%" + key + "%", (String) entry.getValue()); |
266 | } |
267 | } |
268 | |
269 | return fileName; |
270 | } |
271 | |
272 | public void setFilePattern(String filePattern) { |
273 | this.filePattern = replacePattern(filePattern, "\\", File.separator); |
274 | } |
275 | |
276 | /** |
277 | * Collect the properties of the enclosing {@link StepExecution} that will |
278 | * be needed to create a file name. |
279 | * |
280 | * @see org.springframework.batch.core.StepExecutionListener#beforeStep(org.springframework.batch.core.StepExecution) |
281 | */ |
282 | public void beforeStep(StepExecution execution) { |
283 | String stepName = execution.getStepName(); |
284 | String jobName = execution.getJobExecution().getJobInstance().getJobName(); |
285 | Properties properties = jobParametersConverter.getProperties(execution.getJobExecution().getJobInstance() |
286 | .getJobParameters()); |
287 | String fileName = createFileName(jobName, stepName, properties); |
288 | if(fileName.indexOf("%") > -1){ |
289 | //if a % is still left in the fileName after matching, we have to assume that either no job parameter was found, |
290 | //or an invalid path was used. |
291 | throw new IllegalStateException("Invalid file pattern provided: [" + this.filePattern + "], tokens still remain after parameter matching: [" + |
292 | fileName + "]"); |
293 | } |
294 | delegate = resourceLoader.getResource(fileName); |
295 | } |
296 | |
297 | /** |
298 | * Delegates to the proxied Resource if set, otherwise returns the value of {@link #setFilePattern(String)}. |
299 | */ |
300 | public String toString() { |
301 | return (delegate == null) ? filePattern : delegate.toString(); |
302 | } |
303 | |
304 | } |