org.apache.commons.io
Class FileCleaner

java.lang.Object
  extended by org.apache.commons.io.FileCleaner

Deprecated. Use FileCleaningTracker

public class FileCleaner
extends Object

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 exitWhenFinished(), typically in javax.servlet.ServletContextListener#contextDestroyed or similar.

Version:
$Id: FileCleaner.java 553012 2007-07-03 23:01:07Z ggregory $
Author:
Noel Bergman, Martin Cooper

Constructor Summary
FileCleaner()
          Deprecated.  
 
Method Summary
static void exitWhenFinished()
          Deprecated. Use FileCleaningTracker.exitWhenFinished().
static FileCleaningTracker getInstance()
          Deprecated. Returns the singleton instance, which is used by the deprecated, static methods.
static int getTrackCount()
          Deprecated. Use FileCleaningTracker.getTrackCount().
static void track(File file, Object marker)
          Deprecated. Use FileCleaningTracker.track(File, Object).
static void track(File file, Object marker, FileDeleteStrategy deleteStrategy)
          Deprecated. Use FileCleaningTracker.track(File, Object, FileDeleteStrategy).
static void track(String path, Object marker)
          Deprecated. Use FileCleaningTracker.track(String, Object).
static void track(String path, Object marker, FileDeleteStrategy deleteStrategy)
          Deprecated. Use FileCleaningTracker.track(String, Object, FileDeleteStrategy).
 
Methods inherited from class java.lang.Object
clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait
 

Constructor Detail

FileCleaner

public FileCleaner()
Deprecated. 
Method Detail

track

public static void track(File file,
                         Object marker)
Deprecated. Use FileCleaningTracker.track(File, Object).

Track the specified file, using the provided marker, deleting the file when the marker instance is garbage collected. The normal deletion strategy will be used.

Parameters:
file - the file to be tracked, not null
marker - the marker object used to track the file, not null
Throws:
NullPointerException - if the file is null

track

public static void track(File file,
                         Object marker,
                         FileDeleteStrategy deleteStrategy)
Deprecated. Use FileCleaningTracker.track(File, Object, FileDeleteStrategy).

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
marker - the marker object used to track the file, not null
deleteStrategy - the strategy to delete the file, null means normal
Throws:
NullPointerException - if the file is null

track

public static void track(String path,
                         Object marker)
Deprecated. Use FileCleaningTracker.track(String, Object).

Track the specified file, using the provided marker, deleting the file when the marker instance is garbage collected. The normal deletion strategy will be used.

Parameters:
path - the full path to the file to be tracked, not null
marker - the marker object used to track the file, not null
Throws:
NullPointerException - if the path is null

track

public static void track(String path,
                         Object marker,
                         FileDeleteStrategy deleteStrategy)
Deprecated. Use FileCleaningTracker.track(String, Object, FileDeleteStrategy).

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
marker - the marker object used to track the file, not null
deleteStrategy - the strategy to delete the file, null means normal
Throws:
NullPointerException - if the path is null

getTrackCount

public static int getTrackCount()
Deprecated. Use FileCleaningTracker.getTrackCount().

Retrieve the number of files currently being tracked, and therefore awaiting deletion.

Returns:
the number of files being tracked

exitWhenFinished

public static void exitWhenFinished()
Deprecated. Use FileCleaningTracker.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. 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.


getInstance

public static FileCleaningTracker getInstance()
Deprecated. 
Returns the singleton instance, which is used by the deprecated, static methods. This is mainly useful for code, which wants to support the new FileCleaningTracker class while maintain compatibility with the deprecated FileCleaner.

Returns:
the singleton instance


Copyright 2002-2008 The Apache Software Foundation. All Rights Reserved.