| java.lang.Object
 org.apache.commons.io.FileCleaningTracker
| FileCleaningTracker | | public class FileCleaningTracker (Code) | | Keeps track of files awaiting deletion, and deletes them when an associated
marker object is reclaimed by the garbage collector.
This utility creates a background thread to handle file deletion.
Each file to be deleted is registered with a handler object.
When the handler object is garbage collected, the file is deleted.
In an environment with multiple class loaders (a servlet container, for
example), you should consider stopping the background thread if it is no
longer needed. This is done by invoking the method
FileCleaningTracker.exitWhenFinished , typically in
javax.servlet.ServletContextListener.contextDestroyed or similar.
author:
Noel Bergman
author:
Martin Cooper
version:
$Id: FileCleaner.java 490987 2006-12-29 12:11:48Z scolebourne $ |
| Method Summary | |
| public synchronized void | exitWhenFinished()
Call this method to cause the file cleaner thread to terminate when
there are no more objects being tracked for deletion.
In a simple environment, you don't need this method as the file cleaner
thread will simply exit when the JVM exits. | | public int | getTrackCount()
Retrieve the number of files currently being tracked, and therefore
awaiting deletion. | | public void | track(File file, Object marker)
Track the specified file, using the provided marker, deleting the file
when the marker instance is garbage collected. | | public void | track(File file, Object marker, FileDeleteStrategy deleteStrategy)
Track the specified file, using the provided marker, deleting the file
when the marker instance is garbage collected. | | public void | track(String path, Object marker)
Track the specified file, using the provided marker, deleting the file
when the marker instance is garbage collected. | | public void | track(String path, Object marker, FileDeleteStrategy deleteStrategy)
Track the specified file, using the provided marker, deleting the file
when the marker instance is garbage collected. |
| exitWhenFinished | | volatile boolean exitWhenFinished(Code) | | Whether to terminate the thread when the tracking is complete.
|
| reaper | | Thread reaper(Code) | | The thread that will clean up registered files.
|
| trackers | | final Collection trackers(Code) | | Collection of Tracker instances in existence.
|
| exitWhenFinished | | public synchronized void exitWhenFinished()(Code) | | Call this method to cause the file cleaner thread to terminate when
there are no more objects being tracked for deletion.
In a simple environment, you don't need this method as the file cleaner
thread will simply exit when the JVM exits. In a more complex environment,
with multiple class loaders (such as an application server), you should be
aware that the file cleaner thread will continue running even if the class
loader it was started from terminates. This can consitute a memory leak.
For example, suppose that you have developed a web application, which
contains the commons-io jar file in your WEB-INF/lib directory. In other
words, the FileCleaner class is loaded through the class loader of your
web application. If the web application is terminated, but the servlet
container is still running, then the file cleaner thread will still exist,
posing a memory leak.
This method allows the thread to be terminated. Simply call this method
in the resource cleanup code, such as
javax.servlet.ServletContextListener.contextDestroyed .
One called, no new objects can be tracked by the file cleaner.
|
| getTrackCount | | public int getTrackCount()(Code) | | Retrieve the number of files currently being tracked, and therefore
awaiting deletion.
the number of files being tracked |
| track | | public void track(File file, Object marker)(Code) | | Track the specified file, using the provided marker, deleting the file
when the marker instance is garbage collected.
The
FileDeleteStrategy.NORMAL normal deletion strategy will be used.
Parameters:
file - the file to be tracked, not null
Parameters:
marker - the marker object used to track the file, not null
throws:
NullPointerException - if the file is null |
| track | | public void track(File file, Object marker, FileDeleteStrategy deleteStrategy)(Code) | | Track the specified file, using the provided marker, deleting the file
when the marker instance is garbage collected.
The speified deletion strategy is used.
Parameters:
file - the file to be tracked, not null
Parameters:
marker - the marker object used to track the file, not null
Parameters:
deleteStrategy - the strategy to delete the file, null means normal
throws:
NullPointerException - if the file is null |
| track | | public void track(String path, Object marker)(Code) | | Track the specified file, using the provided marker, deleting the file
when the marker instance is garbage collected.
The
FileDeleteStrategy.NORMAL normal deletion strategy will be used.
Parameters:
path - the full path to the file to be tracked, not null
Parameters:
marker - the marker object used to track the file, not null
throws:
NullPointerException - if the path is null |
| track | | public void track(String path, Object marker, FileDeleteStrategy deleteStrategy)(Code) | | Track the specified file, using the provided marker, deleting the file
when the marker instance is garbage collected.
The speified deletion strategy is used.
Parameters:
path - the full path to the file to be tracked, not null
Parameters:
marker - the marker object used to track the file, not null
Parameters:
deleteStrategy - the strategy to delete the file, null means normal
throws:
NullPointerException - if the path is null |
|
|