[927] | 1 | // Copyright 2012 Georg-August-Universität Göttingen, Germany |
---|
| 2 | // |
---|
| 3 | // Licensed under the Apache License, Version 2.0 (the "License"); |
---|
| 4 | // you may not use this file except in compliance with the License. |
---|
| 5 | // You may obtain a copy of the License at |
---|
| 6 | // |
---|
| 7 | // http://www.apache.org/licenses/LICENSE-2.0 |
---|
| 8 | // |
---|
| 9 | // Unless required by applicable law or agreed to in writing, software |
---|
| 10 | // distributed under the License is distributed on an "AS IS" BASIS, |
---|
| 11 | // WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. |
---|
| 12 | // See the License for the specific language governing permissions and |
---|
| 13 | // limitations under the License. |
---|
[857] | 14 | |
---|
| 15 | package de.ugoe.cs.autoquest.htmlmonitor; |
---|
| 16 | |
---|
| 17 | import java.io.File; |
---|
| 18 | import java.io.FileOutputStream; |
---|
| 19 | import java.io.IOException; |
---|
| 20 | import java.io.OutputStreamWriter; |
---|
| 21 | import java.io.PrintWriter; |
---|
| 22 | import java.text.DecimalFormat; |
---|
[1089] | 23 | import java.util.HashSet; |
---|
| 24 | import java.util.Set; |
---|
[857] | 25 | |
---|
[1019] | 26 | import de.ugoe.cs.util.StringTools; |
---|
[872] | 27 | import de.ugoe.cs.util.console.Console; |
---|
| 28 | |
---|
[857] | 29 | /** |
---|
| 30 | * <p> |
---|
[871] | 31 | * dumps messages to a log file belonging to a specific client id. In the provided base log |
---|
| 32 | * directory, it creates a subdirectory with the client id. In this directory it creates |
---|
| 33 | * appropriate log files. The name of each finished log file starts with the "htmlmonitor_" |
---|
| 34 | * followed by the client id and an index of the log file. An unfinished log file has no index yet. |
---|
| 35 | * A log file is finished if |
---|
| 36 | * <ul> |
---|
| 37 | * <li>the client session is closed by a timeout</li> |
---|
| 38 | * <li>the HTML monitor is normally shut down</li> |
---|
| 39 | * <li>on startup an unfinished log file is detected.</li> |
---|
| 40 | * <li>the {@link #MAXIMUM_LOG_FILE_SIZE} is reached</li> |
---|
| 41 | * </ul> |
---|
[857] | 42 | * </p> |
---|
| 43 | * |
---|
| 44 | * @author Patrick Harms |
---|
| 45 | * @version 1.0 |
---|
| 46 | * |
---|
| 47 | */ |
---|
| 48 | public class HtmlMonitorOutputWriter implements HtmlMonitorComponent, HtmlMonitorMessageListener { |
---|
| 49 | |
---|
| 50 | /** |
---|
[871] | 51 | * the maximum size of an individual log file |
---|
[857] | 52 | */ |
---|
| 53 | private static final int MAXIMUM_LOG_FILE_SIZE = 10000000; |
---|
| 54 | |
---|
| 55 | /** |
---|
[871] | 56 | * the default log base directory if none is provided through the constructor |
---|
[857] | 57 | */ |
---|
| 58 | private static final String DEFAULT_LOG_FILE_BASE_DIR = "logs"; |
---|
| 59 | |
---|
| 60 | /** |
---|
[871] | 61 | * the currently used log file base directory |
---|
[857] | 62 | */ |
---|
| 63 | private File logFileBaseDir; |
---|
| 64 | |
---|
| 65 | /** |
---|
[1089] | 66 | * the id of the client of which all messages are logged through this writer |
---|
[857] | 67 | */ |
---|
| 68 | private String clientId; |
---|
| 69 | |
---|
| 70 | /** |
---|
[871] | 71 | * the log file into which all messages are currently written |
---|
[857] | 72 | */ |
---|
| 73 | private File logFile; |
---|
| 74 | |
---|
| 75 | /** |
---|
[871] | 76 | * an output writer to be used for writing into the log file |
---|
[857] | 77 | */ |
---|
| 78 | private PrintWriter outputWriter; |
---|
| 79 | |
---|
| 80 | /** |
---|
[871] | 81 | * the time stamp of the last action taken on this writer (such as logging a message) |
---|
[857] | 82 | */ |
---|
| 83 | private long lastUpdate; |
---|
[1089] | 84 | |
---|
| 85 | /** |
---|
| 86 | * the GUI elements, that were already logged and need therefore not be logged again into |
---|
| 87 | * the same file |
---|
| 88 | */ |
---|
| 89 | private Set<HtmlGUIElement> loggedGUIElements = new HashSet<HtmlGUIElement>(); |
---|
[857] | 90 | |
---|
| 91 | /** |
---|
| 92 | * <p> |
---|
[871] | 93 | * initializes the writer with the log file base directory and the id of the client for which |
---|
| 94 | * this writer logs the messages. |
---|
[857] | 95 | * </p> |
---|
| 96 | * |
---|
[871] | 97 | * @param logFileBaseDir the log file base directory, or null if the default directory shall |
---|
| 98 | * be taken |
---|
| 99 | * @param clientId the ID of the client, for which this writer logs |
---|
[857] | 100 | */ |
---|
| 101 | public HtmlMonitorOutputWriter(String logFileBaseDir, String clientId) { |
---|
| 102 | if (logFileBaseDir == null) { |
---|
| 103 | this.logFileBaseDir = new File(DEFAULT_LOG_FILE_BASE_DIR); |
---|
| 104 | } |
---|
| 105 | else { |
---|
| 106 | this.logFileBaseDir = new File(logFileBaseDir); |
---|
| 107 | } |
---|
| 108 | |
---|
| 109 | this.clientId = clientId; |
---|
| 110 | |
---|
| 111 | lastUpdate = System.currentTimeMillis(); |
---|
| 112 | } |
---|
| 113 | |
---|
| 114 | /* (non-Javadoc) |
---|
| 115 | * @see de.ugoe.cs.autoquest.htmlmonitor.HtmlMonitorComponent#init() |
---|
| 116 | */ |
---|
| 117 | @Override |
---|
| 118 | public synchronized void init() throws HtmlMonitorException { |
---|
| 119 | if (outputWriter != null) { |
---|
| 120 | throw new IllegalStateException("already initialized. Call close() first"); |
---|
| 121 | } |
---|
| 122 | |
---|
| 123 | synchronized (HtmlMonitorOutputWriter.class) { |
---|
| 124 | try { |
---|
| 125 | File clientLogDir = new File(logFileBaseDir, clientId); |
---|
| 126 | |
---|
| 127 | if (!clientLogDir.exists()) { |
---|
[872] | 128 | if (!clientLogDir.mkdirs()) { |
---|
| 129 | throw new HtmlMonitorException("client log file directory " + clientLogDir + |
---|
| 130 | " can not be created"); |
---|
| 131 | } |
---|
[857] | 132 | } |
---|
| 133 | else if (!clientLogDir.isDirectory()) { |
---|
| 134 | throw new HtmlMonitorException("client log file directory " + clientLogDir + |
---|
| 135 | " already exists as a file"); |
---|
| 136 | } |
---|
| 137 | |
---|
| 138 | logFile = new File(clientLogDir, getLogFileName(-1)); |
---|
| 139 | |
---|
| 140 | if (logFile.exists()) { |
---|
| 141 | rotateLogFile(); |
---|
| 142 | } |
---|
| 143 | |
---|
| 144 | createLogWriter(); |
---|
| 145 | } |
---|
| 146 | catch (IOException e) { |
---|
| 147 | throw new HtmlMonitorException("could not open logfile " + logFile, e); |
---|
| 148 | } |
---|
| 149 | } |
---|
| 150 | |
---|
| 151 | lastUpdate = System.currentTimeMillis(); |
---|
| 152 | } |
---|
| 153 | |
---|
| 154 | /** |
---|
| 155 | * <p> |
---|
[871] | 156 | * used to calculate a log file name. If the provided index is smaller 0, then no index |
---|
| 157 | * is added to the file name. A filename is e.g. "htmlmonitor_12345_001.log". |
---|
[857] | 158 | * </p> |
---|
| 159 | * |
---|
[871] | 160 | * @param index the index of the log file or -1 one, if no index shall be added |
---|
| 161 | * |
---|
| 162 | * @return the file name as described |
---|
[857] | 163 | */ |
---|
| 164 | private String getLogFileName(int index) { |
---|
| 165 | String result = "htmlmonitor_" + clientId; |
---|
| 166 | |
---|
| 167 | if (index >= 0) { |
---|
| 168 | result += "_" + new DecimalFormat("000" ).format(index); |
---|
| 169 | } |
---|
| 170 | |
---|
| 171 | result += ".log"; |
---|
| 172 | |
---|
| 173 | return result; |
---|
| 174 | } |
---|
| 175 | |
---|
| 176 | /* (non-Javadoc) |
---|
| 177 | * @see de.ugoe.cs.autoquest.htmlmonitor.HtmlMonitorComponent#start() |
---|
| 178 | */ |
---|
| 179 | @Override |
---|
| 180 | public synchronized void start() throws IllegalStateException, HtmlMonitorException { |
---|
| 181 | lastUpdate = System.currentTimeMillis(); |
---|
| 182 | } |
---|
| 183 | |
---|
| 184 | /* (non-Javadoc) |
---|
[871] | 185 | * @see HtmlMonitorMessageListener#handleMessage(HtmlClientInfos, HtmlEvent[]) |
---|
[857] | 186 | */ |
---|
| 187 | @Override |
---|
[1019] | 188 | public void handleMessage(HtmlClientInfos clientInfos, |
---|
[1069] | 189 | HtmlGUIElement guiStructure, |
---|
[1019] | 190 | HtmlEvent[] events) |
---|
| 191 | { |
---|
[857] | 192 | if (outputWriter == null) { |
---|
| 193 | throw new IllegalStateException("not initialized. Call init() first"); |
---|
| 194 | } |
---|
| 195 | |
---|
[1019] | 196 | if (guiStructure != null) { |
---|
| 197 | dumpGuiStructure(guiStructure); |
---|
| 198 | } |
---|
| 199 | |
---|
[857] | 200 | for (HtmlEvent event : events) { |
---|
| 201 | dumpEvent(event); |
---|
| 202 | } |
---|
| 203 | |
---|
| 204 | outputWriter.flush(); |
---|
| 205 | |
---|
| 206 | try { |
---|
| 207 | considerLogRotate(); |
---|
| 208 | } |
---|
| 209 | catch (IOException e) { |
---|
| 210 | throw new IllegalStateException("could not perform log rotation: " + e, e); |
---|
| 211 | } |
---|
| 212 | |
---|
| 213 | lastUpdate = System.currentTimeMillis(); |
---|
| 214 | } |
---|
| 215 | |
---|
| 216 | /** |
---|
| 217 | * <p> |
---|
[1022] | 218 | * dumps the GUI structure provided by the parameter into the log file. Calls itself |
---|
| 219 | * recursively to traverse the GUI structure. |
---|
[1019] | 220 | * </p> |
---|
| 221 | * |
---|
[1022] | 222 | * @param guiStructure the GUI structure to be logged |
---|
[1019] | 223 | */ |
---|
[1069] | 224 | private void dumpGuiStructure(HtmlGUIElement guiStructure) { |
---|
[1089] | 225 | if (!loggedGUIElements.contains(guiStructure)) { |
---|
| 226 | outputWriter.print("<component id=\""); |
---|
| 227 | outputWriter.print(guiStructure.getId()); |
---|
| 228 | outputWriter.println("\">"); |
---|
[1019] | 229 | |
---|
[1089] | 230 | if (guiStructure instanceof HtmlServer) { |
---|
| 231 | dumpParam("host", ((HtmlServer) guiStructure).getName()); |
---|
| 232 | dumpParam("port", ((HtmlServer) guiStructure).getPort()); |
---|
| 233 | } |
---|
| 234 | else if (guiStructure instanceof HtmlDocument) { |
---|
| 235 | dumpParam("path", ((HtmlDocument) guiStructure).getPath()); |
---|
| 236 | dumpParam("query", ((HtmlDocument) guiStructure).getQuery()); |
---|
| 237 | dumpParam("title", ((HtmlDocument) guiStructure).getTitle()); |
---|
| 238 | } |
---|
| 239 | else if (guiStructure instanceof HtmlPageElement) { |
---|
| 240 | dumpParam("tagname", ((HtmlPageElement) guiStructure).getTagName()); |
---|
| 241 | dumpParam("htmlid", ((HtmlPageElement) guiStructure).getHtmlId()); |
---|
| 242 | dumpParam("index", ((HtmlPageElement) guiStructure).getIndex()); |
---|
| 243 | } |
---|
| 244 | |
---|
| 245 | dumpParam("parent", guiStructure.getParentId()); |
---|
[1019] | 246 | |
---|
[1089] | 247 | outputWriter.println("</component>"); |
---|
[1069] | 248 | |
---|
[1089] | 249 | loggedGUIElements.add(guiStructure); |
---|
| 250 | } |
---|
[1019] | 251 | |
---|
| 252 | if (guiStructure.getChildren() != null) { |
---|
[1069] | 253 | for (HtmlGUIElement child : guiStructure.getChildren()) { |
---|
[1019] | 254 | dumpGuiStructure(child); |
---|
| 255 | } |
---|
| 256 | } |
---|
| 257 | } |
---|
| 258 | |
---|
| 259 | /** |
---|
| 260 | * <p> |
---|
[871] | 261 | * formats a received event and writes it to the log file. One event results in one line |
---|
| 262 | * in the log file containing all infos of the event. |
---|
[857] | 263 | * </p> |
---|
| 264 | * |
---|
[871] | 265 | * @param event to be written to the log file |
---|
[857] | 266 | */ |
---|
| 267 | private void dumpEvent(HtmlEvent event) { |
---|
[1019] | 268 | outputWriter.print("<event type=\""); |
---|
| 269 | outputWriter.print(event.getEventType()); |
---|
| 270 | outputWriter.println("\">"); |
---|
| 271 | |
---|
[857] | 272 | if (event.getCoordinates() != null) { |
---|
[1019] | 273 | dumpParam("X", event.getCoordinates()[0]); |
---|
| 274 | dumpParam("Y", event.getCoordinates()[1]); |
---|
[857] | 275 | } |
---|
| 276 | |
---|
[1019] | 277 | dumpParam("key", event.getKey()); |
---|
[857] | 278 | |
---|
| 279 | if (event.getScrollPosition() != null) { |
---|
[1019] | 280 | dumpParam("scrollX", event.getScrollPosition()[0]); |
---|
| 281 | dumpParam("scrollY", event.getScrollPosition()[1]); |
---|
[857] | 282 | } |
---|
[942] | 283 | |
---|
[1019] | 284 | dumpParam("selectedValue", event.getSelectedValue()); |
---|
[1069] | 285 | |
---|
| 286 | if (event.getTarget() != null) { |
---|
| 287 | dumpParam("target", event.getTarget().getId()); |
---|
| 288 | } |
---|
| 289 | else { |
---|
| 290 | dumpParam("targetDocument", event.getTargetDocument().getId()); |
---|
| 291 | dumpParam("targetDOMPath", event.getTargetDOMPath()); |
---|
| 292 | } |
---|
[1019] | 293 | dumpParam("timestamp", event.getTime()); |
---|
| 294 | |
---|
| 295 | outputWriter.println("</event>"); |
---|
[857] | 296 | } |
---|
| 297 | |
---|
| 298 | /** |
---|
| 299 | * <p> |
---|
[1022] | 300 | * dumps a parameter with the given name and value to the log file. The result is a |
---|
| 301 | * tag named param with a name attribute and a value attribute. The value is transformed |
---|
| 302 | * to a String if it is no String already. Furthermore, an XML entity replacement is performed |
---|
| 303 | * if required. |
---|
[857] | 304 | * </p> |
---|
| 305 | * |
---|
[1022] | 306 | * @param name the name of the parameter to be dumped |
---|
| 307 | * @param value the value of the parameter to be dumped |
---|
[857] | 308 | */ |
---|
[1019] | 309 | private void dumpParam(String name, Object value) { |
---|
| 310 | if (value == null) { |
---|
| 311 | return; |
---|
| 312 | } |
---|
[997] | 313 | |
---|
[1019] | 314 | String val; |
---|
| 315 | |
---|
| 316 | if (value instanceof String) { |
---|
| 317 | val = (String) value; |
---|
| 318 | } |
---|
| 319 | else { |
---|
| 320 | val = value.toString(); |
---|
| 321 | } |
---|
| 322 | |
---|
| 323 | outputWriter.print(" <param name=\""); |
---|
| 324 | outputWriter.print(name); |
---|
| 325 | outputWriter.print("\" value=\""); |
---|
| 326 | outputWriter.print(StringTools.xmlEntityReplacement(val)); |
---|
| 327 | outputWriter.println("\"/>"); |
---|
[857] | 328 | } |
---|
| 329 | |
---|
| 330 | /** |
---|
| 331 | * <p> |
---|
[871] | 332 | * checks, if the log file exeeded the {@link #MAXIMUM_LOG_FILE_SIZE}. If so, the current |
---|
| 333 | * log file is closed, the next log file name is determined and this new file is opend for |
---|
| 334 | * writing. |
---|
[857] | 335 | * </p> |
---|
| 336 | */ |
---|
| 337 | private synchronized void considerLogRotate() throws IOException { |
---|
| 338 | if (logFile.length() > MAXIMUM_LOG_FILE_SIZE) { |
---|
| 339 | closeLogWriter(); |
---|
| 340 | rotateLogFile(); |
---|
| 341 | createLogWriter(); |
---|
| 342 | } |
---|
| 343 | } |
---|
| 344 | |
---|
| 345 | /** |
---|
| 346 | * <p> |
---|
[871] | 347 | * renames the current log file to a new log file with the next available index. It further |
---|
| 348 | * sets the current log file to the default name, i.e. without index. |
---|
[857] | 349 | * </p> |
---|
| 350 | */ |
---|
| 351 | private void rotateLogFile() { |
---|
| 352 | File clientLogDir = logFile.getParentFile(); |
---|
| 353 | File checkFile; |
---|
| 354 | |
---|
| 355 | int logFileIndex = -1; |
---|
| 356 | do { |
---|
| 357 | logFileIndex++; |
---|
| 358 | |
---|
| 359 | checkFile = new File(clientLogDir, getLogFileName(logFileIndex)); |
---|
| 360 | } |
---|
| 361 | while (checkFile.exists()); |
---|
| 362 | |
---|
[872] | 363 | if (!logFile.renameTo(checkFile)) { |
---|
| 364 | Console.printerrln("could not rename log file " + logFile + " to " + checkFile + |
---|
| 365 | ". Will not perform log rotation."); |
---|
| 366 | } |
---|
| 367 | else { |
---|
| 368 | logFileIndex++; |
---|
| 369 | logFile = new File(clientLogDir, getLogFileName(-1)); |
---|
| 370 | } |
---|
[857] | 371 | } |
---|
| 372 | |
---|
| 373 | /** |
---|
| 374 | * <p> |
---|
[871] | 375 | * instantiates a writer to be used for writing messages into the log file. |
---|
[857] | 376 | * </p> |
---|
| 377 | */ |
---|
| 378 | private void createLogWriter() throws IOException { |
---|
| 379 | FileOutputStream fis = new FileOutputStream(logFile); |
---|
| 380 | outputWriter = new PrintWriter(new OutputStreamWriter(fis, "UTF-8")); |
---|
[1019] | 381 | outputWriter.println("<?xml version=\"1.0\" encoding=\"UTF-8\"?>"); |
---|
| 382 | outputWriter.println("<session>"); |
---|
[1089] | 383 | |
---|
| 384 | loggedGUIElements.clear(); |
---|
[857] | 385 | } |
---|
| 386 | |
---|
| 387 | /** |
---|
| 388 | * <p> |
---|
[871] | 389 | * closed the current writer if it is open. |
---|
[857] | 390 | * </p> |
---|
| 391 | */ |
---|
| 392 | private void closeLogWriter() { |
---|
| 393 | if (outputWriter != null) { |
---|
[1019] | 394 | outputWriter.println("</session>"); |
---|
[857] | 395 | outputWriter.flush(); |
---|
| 396 | outputWriter.close(); |
---|
| 397 | outputWriter = null; |
---|
| 398 | } |
---|
| 399 | } |
---|
| 400 | |
---|
| 401 | /* (non-Javadoc) |
---|
| 402 | * @see de.ugoe.cs.autoquest.htmlmonitor.HtmlMonitorComponent#stop() |
---|
| 403 | */ |
---|
| 404 | @Override |
---|
| 405 | public synchronized void stop() { |
---|
| 406 | closeLogWriter(); |
---|
| 407 | rotateLogFile(); |
---|
| 408 | |
---|
| 409 | lastUpdate = System.currentTimeMillis(); |
---|
| 410 | } |
---|
| 411 | |
---|
| 412 | /** |
---|
| 413 | * <p> |
---|
[871] | 414 | * return the time stamp of the last activity that happened on this writer. |
---|
[857] | 415 | * </p> |
---|
| 416 | * |
---|
[871] | 417 | * @return as described |
---|
[857] | 418 | */ |
---|
| 419 | public long getLastUpdate() { |
---|
| 420 | return lastUpdate; |
---|
| 421 | } |
---|
| 422 | } |
---|