Jake Slack | 03928ae | 2014-05-13 18:41:56 -0700 | [diff] [blame] | 1 | // |
| 2 | // ======================================================================== |
| 3 | // Copyright (c) 1995-2014 Mort Bay Consulting Pty. Ltd. |
| 4 | // ------------------------------------------------------------------------ |
| 5 | // All rights reserved. This program and the accompanying materials |
| 6 | // are made available under the terms of the Eclipse Public License v1.0 |
| 7 | // and Apache License v2.0 which accompanies this distribution. |
| 8 | // |
| 9 | // The Eclipse Public License is available at |
| 10 | // http://www.eclipse.org/legal/epl-v10.html |
| 11 | // |
| 12 | // The Apache License v2.0 is available at |
| 13 | // http://www.opensource.org/licenses/apache2.0.php |
| 14 | // |
| 15 | // You may elect to redistribute this code under either of these licenses. |
| 16 | // ======================================================================== |
| 17 | // |
| 18 | |
| 19 | |
| 20 | package org.eclipse.jetty.util; |
| 21 | |
| 22 | import java.io.File; |
| 23 | import java.io.FilenameFilter; |
| 24 | import java.io.IOException; |
| 25 | import java.util.ArrayList; |
| 26 | import java.util.Collections; |
| 27 | import java.util.HashMap; |
| 28 | import java.util.HashSet; |
| 29 | import java.util.Iterator; |
| 30 | import java.util.List; |
| 31 | import java.util.Map; |
| 32 | import java.util.Map.Entry; |
| 33 | import java.util.Set; |
| 34 | import java.util.Timer; |
| 35 | import java.util.TimerTask; |
| 36 | |
| 37 | import org.eclipse.jetty.util.component.AbstractLifeCycle; |
| 38 | import org.eclipse.jetty.util.log.Log; |
| 39 | import org.eclipse.jetty.util.log.Logger; |
| 40 | |
| 41 | |
| 42 | /** |
| 43 | * Scanner |
| 44 | * |
| 45 | * Utility for scanning a directory for added, removed and changed |
| 46 | * files and reporting these events via registered Listeners. |
| 47 | * |
| 48 | */ |
| 49 | public class Scanner extends AbstractLifeCycle |
| 50 | { |
| 51 | private static final Logger LOG = Log.getLogger(Scanner.class); |
| 52 | private static int __scannerId=0; |
| 53 | private int _scanInterval; |
| 54 | private int _scanCount = 0; |
| 55 | private final List<Listener> _listeners = new ArrayList<Listener>(); |
| 56 | private final Map<String,TimeNSize> _prevScan = new HashMap<String,TimeNSize> (); |
| 57 | private final Map<String,TimeNSize> _currentScan = new HashMap<String,TimeNSize> (); |
| 58 | private FilenameFilter _filter; |
| 59 | private final List<File> _scanDirs = new ArrayList<File>(); |
| 60 | private volatile boolean _running = false; |
| 61 | private boolean _reportExisting = true; |
| 62 | private boolean _reportDirs = true; |
| 63 | private Timer _timer; |
| 64 | private TimerTask _task; |
| 65 | private int _scanDepth=0; |
| 66 | |
| 67 | public enum Notification { ADDED, CHANGED, REMOVED }; |
| 68 | private final Map<String,Notification> _notifications = new HashMap<String,Notification>(); |
| 69 | |
| 70 | static class TimeNSize |
| 71 | { |
| 72 | final long _lastModified; |
| 73 | final long _size; |
| 74 | |
| 75 | public TimeNSize(long lastModified, long size) |
| 76 | { |
| 77 | _lastModified = lastModified; |
| 78 | _size = size; |
| 79 | } |
| 80 | |
| 81 | @Override |
| 82 | public int hashCode() |
| 83 | { |
| 84 | return (int)_lastModified^(int)_size; |
| 85 | } |
| 86 | |
| 87 | @Override |
| 88 | public boolean equals(Object o) |
| 89 | { |
| 90 | if (o instanceof TimeNSize) |
| 91 | { |
| 92 | TimeNSize tns = (TimeNSize)o; |
| 93 | return tns._lastModified==_lastModified && tns._size==_size; |
| 94 | } |
| 95 | return false; |
| 96 | } |
| 97 | |
| 98 | @Override |
| 99 | public String toString() |
| 100 | { |
| 101 | return "[lm="+_lastModified+",s="+_size+"]"; |
| 102 | } |
| 103 | } |
| 104 | |
| 105 | /** |
| 106 | * Listener |
| 107 | * |
| 108 | * Marker for notifications re file changes. |
| 109 | */ |
| 110 | public interface Listener |
| 111 | { |
| 112 | } |
| 113 | |
| 114 | public interface ScanListener extends Listener |
| 115 | { |
| 116 | public void scan(); |
| 117 | } |
| 118 | |
| 119 | public interface DiscreteListener extends Listener |
| 120 | { |
| 121 | public void fileChanged (String filename) throws Exception; |
| 122 | public void fileAdded (String filename) throws Exception; |
| 123 | public void fileRemoved (String filename) throws Exception; |
| 124 | } |
| 125 | |
| 126 | |
| 127 | public interface BulkListener extends Listener |
| 128 | { |
| 129 | public void filesChanged (List<String> filenames) throws Exception; |
| 130 | } |
| 131 | |
| 132 | /** |
| 133 | * Listener that notifies when a scan has started and when it has ended. |
| 134 | */ |
| 135 | public interface ScanCycleListener extends Listener |
| 136 | { |
| 137 | public void scanStarted(int cycle) throws Exception; |
| 138 | public void scanEnded(int cycle) throws Exception; |
| 139 | } |
| 140 | |
| 141 | /** |
| 142 | * |
| 143 | */ |
| 144 | public Scanner () |
| 145 | { |
| 146 | } |
| 147 | |
| 148 | /** |
| 149 | * Get the scan interval |
| 150 | * @return interval between scans in seconds |
| 151 | */ |
| 152 | public int getScanInterval() |
| 153 | { |
| 154 | return _scanInterval; |
| 155 | } |
| 156 | |
| 157 | /** |
| 158 | * Set the scan interval |
| 159 | * @param scanInterval pause between scans in seconds, or 0 for no scan after the initial scan. |
| 160 | */ |
| 161 | public synchronized void setScanInterval(int scanInterval) |
| 162 | { |
| 163 | _scanInterval = scanInterval; |
| 164 | schedule(); |
| 165 | } |
| 166 | |
| 167 | /** |
| 168 | * Set the location of the directory to scan. |
| 169 | * @param dir |
| 170 | * @deprecated use setScanDirs(List dirs) instead |
| 171 | */ |
| 172 | @Deprecated |
| 173 | public void setScanDir (File dir) |
| 174 | { |
| 175 | _scanDirs.clear(); |
| 176 | _scanDirs.add(dir); |
| 177 | } |
| 178 | |
| 179 | /** |
| 180 | * Get the location of the directory to scan |
| 181 | * @return the first directory (of {@link #getScanDirs()} being scanned) |
| 182 | * @deprecated use getScanDirs() instead |
| 183 | */ |
| 184 | @Deprecated |
| 185 | public File getScanDir () |
| 186 | { |
| 187 | return (_scanDirs==null?null:(File)_scanDirs.get(0)); |
| 188 | } |
| 189 | |
| 190 | public void setScanDirs (List<File> dirs) |
| 191 | { |
| 192 | _scanDirs.clear(); |
| 193 | _scanDirs.addAll(dirs); |
| 194 | } |
| 195 | |
| 196 | public synchronized void addScanDir( File dir ) |
| 197 | { |
| 198 | _scanDirs.add( dir ); |
| 199 | } |
| 200 | |
| 201 | public List<File> getScanDirs () |
| 202 | { |
| 203 | return Collections.unmodifiableList(_scanDirs); |
| 204 | } |
| 205 | |
| 206 | /* ------------------------------------------------------------ */ |
| 207 | /** |
| 208 | * @param recursive True if scanning is recursive |
| 209 | * @see #setScanDepth(int) |
| 210 | */ |
| 211 | public void setRecursive (boolean recursive) |
| 212 | { |
| 213 | _scanDepth=recursive?-1:0; |
| 214 | } |
| 215 | |
| 216 | /* ------------------------------------------------------------ */ |
| 217 | /** |
| 218 | * @return True if scanning is fully recursive (scandepth==-1) |
| 219 | * @see #getScanDepth() |
| 220 | */ |
| 221 | public boolean getRecursive () |
| 222 | { |
| 223 | return _scanDepth==-1; |
| 224 | } |
| 225 | |
| 226 | /* ------------------------------------------------------------ */ |
| 227 | /** Get the scanDepth. |
| 228 | * @return the scanDepth |
| 229 | */ |
| 230 | public int getScanDepth() |
| 231 | { |
| 232 | return _scanDepth; |
| 233 | } |
| 234 | |
| 235 | /* ------------------------------------------------------------ */ |
| 236 | /** Set the scanDepth. |
| 237 | * @param scanDepth the scanDepth to set |
| 238 | */ |
| 239 | public void setScanDepth(int scanDepth) |
| 240 | { |
| 241 | _scanDepth = scanDepth; |
| 242 | } |
| 243 | |
| 244 | /** |
| 245 | * Apply a filter to files found in the scan directory. |
| 246 | * Only files matching the filter will be reported as added/changed/removed. |
| 247 | * @param filter |
| 248 | */ |
| 249 | public void setFilenameFilter (FilenameFilter filter) |
| 250 | { |
| 251 | _filter = filter; |
| 252 | } |
| 253 | |
| 254 | /** |
| 255 | * Get any filter applied to files in the scan dir. |
| 256 | * @return the filename filter |
| 257 | */ |
| 258 | public FilenameFilter getFilenameFilter () |
| 259 | { |
| 260 | return _filter; |
| 261 | } |
| 262 | |
| 263 | /* ------------------------------------------------------------ */ |
| 264 | /** |
| 265 | * Whether or not an initial scan will report all files as being |
| 266 | * added. |
| 267 | * @param reportExisting if true, all files found on initial scan will be |
| 268 | * reported as being added, otherwise not |
| 269 | */ |
| 270 | public void setReportExistingFilesOnStartup (boolean reportExisting) |
| 271 | { |
| 272 | _reportExisting = reportExisting; |
| 273 | } |
| 274 | |
| 275 | /* ------------------------------------------------------------ */ |
| 276 | public boolean getReportExistingFilesOnStartup() |
| 277 | { |
| 278 | return _reportExisting; |
| 279 | } |
| 280 | |
| 281 | /* ------------------------------------------------------------ */ |
| 282 | /** Set if found directories should be reported. |
| 283 | * @param dirs |
| 284 | */ |
| 285 | public void setReportDirs(boolean dirs) |
| 286 | { |
| 287 | _reportDirs=dirs; |
| 288 | } |
| 289 | |
| 290 | /* ------------------------------------------------------------ */ |
| 291 | public boolean getReportDirs() |
| 292 | { |
| 293 | return _reportDirs; |
| 294 | } |
| 295 | |
| 296 | /* ------------------------------------------------------------ */ |
| 297 | /** |
| 298 | * Add an added/removed/changed listener |
| 299 | * @param listener |
| 300 | */ |
| 301 | public synchronized void addListener (Listener listener) |
| 302 | { |
| 303 | if (listener == null) |
| 304 | return; |
| 305 | _listeners.add(listener); |
| 306 | } |
| 307 | |
| 308 | |
| 309 | |
| 310 | /** |
| 311 | * Remove a registered listener |
| 312 | * @param listener the Listener to be removed |
| 313 | */ |
| 314 | public synchronized void removeListener (Listener listener) |
| 315 | { |
| 316 | if (listener == null) |
| 317 | return; |
| 318 | _listeners.remove(listener); |
| 319 | } |
| 320 | |
| 321 | |
| 322 | /** |
| 323 | * Start the scanning action. |
| 324 | */ |
| 325 | @Override |
| 326 | public synchronized void doStart() |
| 327 | { |
| 328 | if (_running) |
| 329 | return; |
| 330 | |
| 331 | _running = true; |
| 332 | |
| 333 | if (_reportExisting) |
| 334 | { |
| 335 | // if files exist at startup, report them |
| 336 | scan(); |
| 337 | scan(); // scan twice so files reported as stable |
| 338 | } |
| 339 | else |
| 340 | { |
| 341 | //just register the list of existing files and only report changes |
| 342 | scanFiles(); |
| 343 | _prevScan.putAll(_currentScan); |
| 344 | } |
| 345 | schedule(); |
| 346 | } |
| 347 | |
| 348 | public TimerTask newTimerTask () |
| 349 | { |
| 350 | return new TimerTask() |
| 351 | { |
| 352 | @Override |
| 353 | public void run() { scan(); } |
| 354 | }; |
| 355 | } |
| 356 | |
| 357 | public Timer newTimer () |
| 358 | { |
| 359 | return new Timer("Scanner-"+__scannerId++, true); |
| 360 | } |
| 361 | |
| 362 | public void schedule () |
| 363 | { |
| 364 | if (_running) |
| 365 | { |
| 366 | if (_timer!=null) |
| 367 | _timer.cancel(); |
| 368 | if (_task!=null) |
| 369 | _task.cancel(); |
| 370 | if (getScanInterval() > 0) |
| 371 | { |
| 372 | _timer = newTimer(); |
| 373 | _task = newTimerTask(); |
| 374 | _timer.schedule(_task, 1010L*getScanInterval(),1010L*getScanInterval()); |
| 375 | } |
| 376 | } |
| 377 | } |
| 378 | /** |
| 379 | * Stop the scanning. |
| 380 | */ |
| 381 | @Override |
| 382 | public synchronized void doStop() |
| 383 | { |
| 384 | if (_running) |
| 385 | { |
| 386 | _running = false; |
| 387 | if (_timer!=null) |
| 388 | _timer.cancel(); |
| 389 | if (_task!=null) |
| 390 | _task.cancel(); |
| 391 | _task=null; |
| 392 | _timer=null; |
| 393 | } |
| 394 | } |
| 395 | |
| 396 | /** |
| 397 | * Perform a pass of the scanner and report changes |
| 398 | */ |
| 399 | public synchronized void scan () |
| 400 | { |
| 401 | reportScanStart(++_scanCount); |
| 402 | scanFiles(); |
| 403 | reportDifferences(_currentScan, _prevScan); |
| 404 | _prevScan.clear(); |
| 405 | _prevScan.putAll(_currentScan); |
| 406 | reportScanEnd(_scanCount); |
| 407 | |
| 408 | for (Listener l : _listeners) |
| 409 | { |
| 410 | try |
| 411 | { |
| 412 | if (l instanceof ScanListener) |
| 413 | ((ScanListener)l).scan(); |
| 414 | } |
| 415 | catch (Exception e) |
| 416 | { |
| 417 | LOG.warn(e); |
| 418 | } |
| 419 | catch (Error e) |
| 420 | { |
| 421 | LOG.warn(e); |
| 422 | } |
| 423 | } |
| 424 | } |
| 425 | |
| 426 | /** |
| 427 | * Recursively scan all files in the designated directories. |
| 428 | */ |
| 429 | public synchronized void scanFiles () |
| 430 | { |
| 431 | if (_scanDirs==null) |
| 432 | return; |
| 433 | |
| 434 | _currentScan.clear(); |
| 435 | Iterator<File> itor = _scanDirs.iterator(); |
| 436 | while (itor.hasNext()) |
| 437 | { |
| 438 | File dir = itor.next(); |
| 439 | |
| 440 | if ((dir != null) && (dir.exists())) |
| 441 | try |
| 442 | { |
| 443 | scanFile(dir.getCanonicalFile(), _currentScan,0); |
| 444 | } |
| 445 | catch (IOException e) |
| 446 | { |
| 447 | LOG.warn("Error scanning files.", e); |
| 448 | } |
| 449 | } |
| 450 | } |
| 451 | |
| 452 | |
| 453 | /** |
| 454 | * Report the adds/changes/removes to the registered listeners |
| 455 | * |
| 456 | * @param currentScan the info from the most recent pass |
| 457 | * @param oldScan info from the previous pass |
| 458 | */ |
| 459 | public synchronized void reportDifferences (Map<String,TimeNSize> currentScan, Map<String,TimeNSize> oldScan) |
| 460 | { |
| 461 | // scan the differences and add what was found to the map of notifications: |
| 462 | |
| 463 | Set<String> oldScanKeys = new HashSet<String>(oldScan.keySet()); |
| 464 | |
| 465 | // Look for new and changed files |
| 466 | for (Map.Entry<String, TimeNSize> entry: currentScan.entrySet()) |
| 467 | { |
| 468 | String file = entry.getKey(); |
| 469 | if (!oldScanKeys.contains(file)) |
| 470 | { |
| 471 | Notification old=_notifications.put(file,Notification.ADDED); |
| 472 | if (old!=null) |
| 473 | { |
| 474 | switch(old) |
| 475 | { |
| 476 | case REMOVED: |
| 477 | case CHANGED: |
| 478 | _notifications.put(file,Notification.CHANGED); |
| 479 | } |
| 480 | } |
| 481 | } |
| 482 | else if (!oldScan.get(file).equals(currentScan.get(file))) |
| 483 | { |
| 484 | Notification old=_notifications.put(file,Notification.CHANGED); |
| 485 | if (old!=null) |
| 486 | { |
| 487 | switch(old) |
| 488 | { |
| 489 | case ADDED: |
| 490 | _notifications.put(file,Notification.ADDED); |
| 491 | } |
| 492 | } |
| 493 | } |
| 494 | } |
| 495 | |
| 496 | // Look for deleted files |
| 497 | for (String file : oldScan.keySet()) |
| 498 | { |
| 499 | if (!currentScan.containsKey(file)) |
| 500 | { |
| 501 | Notification old=_notifications.put(file,Notification.REMOVED); |
| 502 | if (old!=null) |
| 503 | { |
| 504 | switch(old) |
| 505 | { |
| 506 | case ADDED: |
| 507 | _notifications.remove(file); |
| 508 | } |
| 509 | } |
| 510 | } |
| 511 | } |
| 512 | |
| 513 | if (LOG.isDebugEnabled()) |
| 514 | LOG.debug("scanned "+_scanDirs+": "+_notifications); |
| 515 | |
| 516 | // Process notifications |
| 517 | // Only process notifications that are for stable files (ie same in old and current scan). |
| 518 | List<String> bulkChanges = new ArrayList<String>(); |
| 519 | for (Iterator<Entry<String,Notification>> iter = _notifications.entrySet().iterator();iter.hasNext();) |
| 520 | { |
| 521 | Entry<String,Notification> entry=iter.next(); |
| 522 | String file=entry.getKey(); |
| 523 | |
| 524 | // Is the file stable? |
| 525 | if (oldScan.containsKey(file)) |
| 526 | { |
| 527 | if (!oldScan.get(file).equals(currentScan.get(file))) |
| 528 | continue; |
| 529 | } |
| 530 | else if (currentScan.containsKey(file)) |
| 531 | continue; |
| 532 | |
| 533 | // File is stable so notify |
| 534 | Notification notification=entry.getValue(); |
| 535 | iter.remove(); |
| 536 | bulkChanges.add(file); |
| 537 | switch(notification) |
| 538 | { |
| 539 | case ADDED: |
| 540 | reportAddition(file); |
| 541 | break; |
| 542 | case CHANGED: |
| 543 | reportChange(file); |
| 544 | break; |
| 545 | case REMOVED: |
| 546 | reportRemoval(file); |
| 547 | break; |
| 548 | } |
| 549 | } |
| 550 | if (!bulkChanges.isEmpty()) |
| 551 | reportBulkChanges(bulkChanges); |
| 552 | } |
| 553 | |
| 554 | |
| 555 | /** |
| 556 | * Get last modified time on a single file or recurse if |
| 557 | * the file is a directory. |
| 558 | * @param f file or directory |
| 559 | * @param scanInfoMap map of filenames to last modified times |
| 560 | */ |
| 561 | private void scanFile (File f, Map<String,TimeNSize> scanInfoMap, int depth) |
| 562 | { |
| 563 | try |
| 564 | { |
| 565 | if (!f.exists()) |
| 566 | return; |
| 567 | |
| 568 | if (f.isFile() || depth>0&& _reportDirs && f.isDirectory()) |
| 569 | { |
| 570 | if ((_filter == null) || ((_filter != null) && _filter.accept(f.getParentFile(), f.getName()))) |
| 571 | { |
| 572 | String name = f.getCanonicalPath(); |
| 573 | scanInfoMap.put(name, new TimeNSize(f.lastModified(),f.length())); |
| 574 | } |
| 575 | } |
| 576 | |
| 577 | // If it is a directory, scan if it is a known directory or the depth is OK. |
| 578 | if (f.isDirectory() && (depth<_scanDepth || _scanDepth==-1 || _scanDirs.contains(f))) |
| 579 | { |
| 580 | File[] files = f.listFiles(); |
| 581 | if (files != null) |
| 582 | { |
| 583 | for (int i=0;i<files.length;i++) |
| 584 | scanFile(files[i], scanInfoMap,depth+1); |
| 585 | } |
| 586 | else |
| 587 | LOG.warn("Error listing files in directory {}", f); |
| 588 | |
| 589 | } |
| 590 | } |
| 591 | catch (IOException e) |
| 592 | { |
| 593 | LOG.warn("Error scanning watched files", e); |
| 594 | } |
| 595 | } |
| 596 | |
| 597 | private void warn(Object listener,String filename,Throwable th) |
| 598 | { |
| 599 | LOG.warn(listener+" failed on '"+filename, th); |
| 600 | } |
| 601 | |
| 602 | /** |
| 603 | * Report a file addition to the registered FileAddedListeners |
| 604 | * @param filename |
| 605 | */ |
| 606 | private void reportAddition (String filename) |
| 607 | { |
| 608 | Iterator<Listener> itor = _listeners.iterator(); |
| 609 | while (itor.hasNext()) |
| 610 | { |
| 611 | Listener l = itor.next(); |
| 612 | try |
| 613 | { |
| 614 | if (l instanceof DiscreteListener) |
| 615 | ((DiscreteListener)l).fileAdded(filename); |
| 616 | } |
| 617 | catch (Exception e) |
| 618 | { |
| 619 | warn(l,filename,e); |
| 620 | } |
| 621 | catch (Error e) |
| 622 | { |
| 623 | warn(l,filename,e); |
| 624 | } |
| 625 | } |
| 626 | } |
| 627 | |
| 628 | |
| 629 | /** |
| 630 | * Report a file removal to the FileRemovedListeners |
| 631 | * @param filename |
| 632 | */ |
| 633 | private void reportRemoval (String filename) |
| 634 | { |
| 635 | Iterator<Listener> itor = _listeners.iterator(); |
| 636 | while (itor.hasNext()) |
| 637 | { |
| 638 | Object l = itor.next(); |
| 639 | try |
| 640 | { |
| 641 | if (l instanceof DiscreteListener) |
| 642 | ((DiscreteListener)l).fileRemoved(filename); |
| 643 | } |
| 644 | catch (Exception e) |
| 645 | { |
| 646 | warn(l,filename,e); |
| 647 | } |
| 648 | catch (Error e) |
| 649 | { |
| 650 | warn(l,filename,e); |
| 651 | } |
| 652 | } |
| 653 | } |
| 654 | |
| 655 | |
| 656 | /** |
| 657 | * Report a file change to the FileChangedListeners |
| 658 | * @param filename |
| 659 | */ |
| 660 | private void reportChange (String filename) |
| 661 | { |
| 662 | Iterator<Listener> itor = _listeners.iterator(); |
| 663 | while (itor.hasNext()) |
| 664 | { |
| 665 | Listener l = itor.next(); |
| 666 | try |
| 667 | { |
| 668 | if (l instanceof DiscreteListener) |
| 669 | ((DiscreteListener)l).fileChanged(filename); |
| 670 | } |
| 671 | catch (Exception e) |
| 672 | { |
| 673 | warn(l,filename,e); |
| 674 | } |
| 675 | catch (Error e) |
| 676 | { |
| 677 | warn(l,filename,e); |
| 678 | } |
| 679 | } |
| 680 | } |
| 681 | |
| 682 | private void reportBulkChanges (List<String> filenames) |
| 683 | { |
| 684 | Iterator<Listener> itor = _listeners.iterator(); |
| 685 | while (itor.hasNext()) |
| 686 | { |
| 687 | Listener l = itor.next(); |
| 688 | try |
| 689 | { |
| 690 | if (l instanceof BulkListener) |
| 691 | ((BulkListener)l).filesChanged(filenames); |
| 692 | } |
| 693 | catch (Exception e) |
| 694 | { |
| 695 | warn(l,filenames.toString(),e); |
| 696 | } |
| 697 | catch (Error e) |
| 698 | { |
| 699 | warn(l,filenames.toString(),e); |
| 700 | } |
| 701 | } |
| 702 | } |
| 703 | |
| 704 | /** |
| 705 | * signal any scan cycle listeners that a scan has started |
| 706 | */ |
| 707 | private void reportScanStart(int cycle) |
| 708 | { |
| 709 | for (Listener listener : _listeners) |
| 710 | { |
| 711 | try |
| 712 | { |
| 713 | if (listener instanceof ScanCycleListener) |
| 714 | { |
| 715 | ((ScanCycleListener)listener).scanStarted(cycle); |
| 716 | } |
| 717 | } |
| 718 | catch (Exception e) |
| 719 | { |
| 720 | LOG.warn(listener + " failed on scan start for cycle " + cycle, e); |
| 721 | } |
| 722 | } |
| 723 | } |
| 724 | |
| 725 | /** |
| 726 | * sign |
| 727 | */ |
| 728 | private void reportScanEnd(int cycle) |
| 729 | { |
| 730 | for (Listener listener : _listeners) |
| 731 | { |
| 732 | try |
| 733 | { |
| 734 | if (listener instanceof ScanCycleListener) |
| 735 | { |
| 736 | ((ScanCycleListener)listener).scanEnded(cycle); |
| 737 | } |
| 738 | } |
| 739 | catch (Exception e) |
| 740 | { |
| 741 | LOG.warn(listener + " failed on scan end for cycle " + cycle, e); |
| 742 | } |
| 743 | } |
| 744 | } |
| 745 | |
| 746 | } |