org.apache.commons.io

Class FileCleaner


  • Deprecated. 

    @Deprecatedpublic class FileCleanerextends 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(javax.servlet.ServletContextEvent) or similar.

    Version:
    $Id: FileCleaner.java 1680650 2015-05-20 18:36:40Z britter $
    • Constructor Detail

      • FileCleaner

        public FileCleaner()
        Deprecated. 
    • Method Detail

      • track

        @Deprecatedpublic static void track(File file,                    Object marker)
        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

        @Deprecatedpublic static void track(String path,                    Object marker)
        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
      • getTrackCount

        @Deprecatedpublic static int getTrackCount()
        Retrieve the number of files currently being tracked, and therefore awaiting deletion.
        Returns:
        the number of files being tracked
      • exitWhenFinished

        @Deprecatedpublic static 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. 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(javax.servlet.ServletContextEvent). 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

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