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Commons IO example source code file (FileCleaner.java)

This example Commons IO source code file (FileCleaner.java) is included in the DevDaily.com "Java Source Code Warehouse" project. The intent of this project is to help you "Learn Java by Example" TM.

Java - Commons IO tags/keywords

deprecated, deprecated, filecleaner, filecleaningtracker, filecleaningtracker, filedeletestrategy, filedeletestrategy, io, object, object

The Commons IO FileCleaner.java source code

/*
 * Licensed to the Apache Software Foundation (ASF) under one or more
 * contributor license agreements.  See the NOTICE file distributed with
 * this work for additional information regarding copyright ownership.
 * The ASF licenses this file to You under the Apache License, Version 2.0
 * (the "License"); you may not use this file except in compliance with
 * the License.  You may obtain a copy of the License at
 * 
 *      http://www.apache.org/licenses/LICENSE-2.0
 * 
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */
package org.apache.commons.io;

import java.io.File;

/**
 * Keeps track of files awaiting deletion, and deletes them when an associated
 * marker object is reclaimed by the garbage collector.
 * <p>
 * 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.
 * <p>
 * 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
 * {@link #exitWhenFinished}, typically in
 * {@link javax.servlet.ServletContextListener#contextDestroyed} or similar.
 *
 * @author Noel Bergman
 * @author Martin Cooper
 * @version $Id: FileCleaner.java 723969 2008-12-06 11:00:40Z sebb $
 * @deprecated Use {@link FileCleaningTracker}
 */
@Deprecated
public class FileCleaner {
    /**
     * The instance to use for the deprecated, static methods.
     */
    static final FileCleaningTracker theInstance = new FileCleaningTracker();

    //-----------------------------------------------------------------------
    /**
     * Track the specified file, using the provided marker, deleting the file
     * when the marker instance is garbage collected.
     * The {@link FileDeleteStrategy#NORMAL normal} deletion strategy will be used.
     *
     * @param file  the file to be tracked, not null
     * @param marker  the marker object used to track the file, not null
     * @throws NullPointerException if the file is null
     * @deprecated Use {@link FileCleaningTracker#track(File, Object)}.
     */
    @Deprecated
    public static void track(File file, Object marker) {
        theInstance.track(file, marker);
    }

    /**
     * Track the specified file, using the provided marker, deleting the file
     * when the marker instance is garbage collected.
     * The speified deletion strategy is used.
     *
     * @param file  the file to be tracked, not null
     * @param marker  the marker object used to track the file, not null
     * @param deleteStrategy  the strategy to delete the file, null means normal
     * @throws NullPointerException if the file is null
     * @deprecated Use {@link FileCleaningTracker#track(File, Object, FileDeleteStrategy)}.
     */
    @Deprecated
    public static void track(File file, Object marker, FileDeleteStrategy deleteStrategy) {
        theInstance.track(file, marker, deleteStrategy);
    }

    /**
     * Track the specified file, using the provided marker, deleting the file
     * when the marker instance is garbage collected.
     * The {@link FileDeleteStrategy#NORMAL normal} deletion strategy will be used.
     *
     * @param path  the full path to the file to be tracked, not null
     * @param marker  the marker object used to track the file, not null
     * @throws NullPointerException if the path is null
     * @deprecated Use {@link FileCleaningTracker#track(String, Object)}.
     */
    @Deprecated
    public static void track(String path, Object marker) {
        theInstance.track(path, marker);
    }

    /**
     * Track the specified file, using the provided marker, deleting the file
     * when the marker instance is garbage collected.
     * The speified deletion strategy is used.
     *
     * @param path  the full path to the file to be tracked, not null
     * @param marker  the marker object used to track the file, not null
     * @param deleteStrategy  the strategy to delete the file, null means normal
     * @throws NullPointerException if the path is null
     * @deprecated Use {@link FileCleaningTracker#track(String, Object, FileDeleteStrategy)}.
     */
    @Deprecated
    public static void track(String path, Object marker, FileDeleteStrategy deleteStrategy) {
        theInstance.track(path, marker, deleteStrategy);
    }

    //-----------------------------------------------------------------------
    /**
     * Retrieve the number of files currently being tracked, and therefore
     * awaiting deletion.
     *
     * @return the number of files being tracked
     * @deprecated Use {@link FileCleaningTracker#getTrackCount()}.
     */
    @Deprecated
    public static int getTrackCount() {
        return theInstance.getTrackCount();
    }

    /**
     * Call this method to cause the file cleaner thread to terminate when
     * there are no more objects being tracked for deletion.
     * <p>
     * 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.
     * <p>
     * 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.
     * <p>
     * This method allows the thread to be terminated. Simply call this method
     * in the resource cleanup code, such as {@link javax.servlet.ServletContextListener#contextDestroyed}.
     * One called, no new objects can be tracked by the file cleaner.
     * @deprecated Use {@link FileCleaningTracker#exitWhenFinished()}.
     */
    @Deprecated
    public static synchronized void exitWhenFinished() {
        theInstance.exitWhenFinished();
    }

    /**
     * Returns the singleton instance, which is used by the deprecated, static methods.
     * This is mainly useful for code, which wants to support the new
     * {@link FileCleaningTracker} class while maintain compatibility with the
     * deprecated {@link FileCleaner}.
     * 
     * @return the singleton instance
     */
    public static FileCleaningTracker getInstance() {
        return theInstance;
    }
}

Other Commons IO examples (source code examples)

Here is a short list of links related to this Commons IO FileCleaner.java source code file:



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