/**
* Start watching at a given polling rate
*
* @param pollFrequency The poll rate
*/
public void start(final Duration pollFrequency) {
// Construct task with the given polling frequency
task = new Task("ModificationWatcher");
task.run(
pollFrequency,
new ICode() {
public void run(final Log log) {
// Iterate over a copy of the list of entries to avoid
// concurrent
// modification problems without the associated liveness issues
// of holding a lock while potentially polling file times!
for (final Iterator<Entry> iterator =
new ArrayList<Entry>(modifiableToEntry.values()).iterator();
iterator.hasNext(); ) {
// Get next entry
final Entry entry = iterator.next();
// If the modifiable has been modified after the last known
// modification time
final Time modifiableLastModified = entry.modifiable.lastModifiedTime();
if (modifiableLastModified.after(entry.lastModifiedTime)) {
// Notify all listeners that the modifiable was modified
entry.listeners.notifyListeners();
// Update timestamp
entry.lastModifiedTime = modifiableLastModified;
}
}
}
});
}
/** stops the modification watcher from watching. */
public void destroy() {
if (task != null) {
task.stop();
}
}