gw.fs.watcher

Class DirectoryWatcher

java.lang.Object

gw.fs.watcher.DirectoryWatcher

public class DirectoryWatcher
extends Object

Nested Class Summary

Nested Classes

Modifier and Type	Class and Description
static class	DirectoryWatcher.FileEvent

Constructor Summary

Constructors

Constructor and Description
DirectoryWatcher()

Method Summary

Modifier and Type	Method and Description
Map<Path,DirectoryWatcher.FileEvent>	getChangesSinceLastTime() Checks all the watched directories (that are being kept in a map) for changes since the last call to this method.
void	stopWatching() Close the watch service.
void	watchDirectoryTree(Path dir) Walk the directories under given path, and register a watcher for every directory.

Methods inherited from class java.lang.Object

clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait

Constructor Detail

DirectoryWatcher

public DirectoryWatcher()

Method Detail

stopWatching

public void stopWatching()

Close the watch service. Releases resources. After calling, this instance becomes invalid and can't be used any more.

watchDirectoryTree

public void watchDirectoryTree(Path dir)

Walk the directories under given path, and register a watcher for every directory.

Parameters:

dir - the starting point under which to listen for changes, if it doesn't exist, do nothing.

getChangesSinceLastTime

public Map<Path,DirectoryWatcher.FileEvent> getChangesSinceLastTime()

Checks all the watched directories (that are being kept in a map) for changes since the last call to this method.

If a file is already marked as CREATE, leave it as CREATE; if it's marked as DELETE, that's totally invalid, so just ignore that. If it's marked as MODIFY, no need to change it. So only put something in the map if it's not already in there. If a create follows a delete, it means the editor deleted and re-created the file, and who knows what the contents are now, so it should be treated as a modification. If the file was created, then deleted, then just ignore it entirely and remove the event.

Returns:

FileEvent enum for each watched Path found, indicating the type of modification that happened.