1 /*
2 * Licensed to the Apache Software Foundation (ASF) under one or more
3 * contributor license agreements. See the NOTICE file distributed with
4 * this work for additional information regarding copyright ownership.
5 * The ASF licenses this file to You under the Apache License, Version 2.0
6 * (the "License"); you may not use this file except in compliance with
7 * the License. You may obtain a copy of the License at
8 *
9 * http://www.apache.org/licenses/LICENSE-2.0
10 *
11 * Unless required by applicable law or agreed to in writing, software
12 * distributed under the License is distributed on an "AS IS" BASIS,
13 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
14 * See the License for the specific language governing permissions and
15 * limitations under the License.
16 */
17 package org.apache.commons.fileupload2.javax;
18
19 import javax.servlet.ServletContext;
20 import javax.servlet.ServletContextEvent;
21 import javax.servlet.ServletContextListener;
22
23 import org.apache.commons.io.FileCleaningTracker;
24
25 /**
26 * A servlet context listener, which ensures that the {@link FileCleaningTracker}'s reaper thread is terminated, when the web application is destroyed.
27 */
28 public class JavaxFileCleaner implements ServletContextListener {
29
30 /**
31 * Attribute name, which is used for storing an instance of {@link FileCleaningTracker} in the web application.
32 */
33 public static final String FILE_CLEANING_TRACKER_ATTRIBUTE = JavaxFileCleaner.class.getName() + ".FileCleaningTracker";
34
35 /**
36 * Gets the instance of {@link FileCleaningTracker}, which is associated with the given {@link ServletContext}.
37 *
38 * @param servletContext The servlet context to query
39 * @return The contexts tracker
40 */
41 public static FileCleaningTracker getFileCleaningTracker(final ServletContext servletContext) {
42 return (FileCleaningTracker) servletContext.getAttribute(FILE_CLEANING_TRACKER_ATTRIBUTE);
43 }
44
45 /**
46 * Sets the instance of {@link FileCleaningTracker}, which is associated with the given {@link ServletContext}.
47 *
48 * @param servletContext The servlet context to modify
49 * @param tracker The tracker to set
50 */
51 public static void setFileCleaningTracker(final ServletContext servletContext, final FileCleaningTracker tracker) {
52 servletContext.setAttribute(FILE_CLEANING_TRACKER_ATTRIBUTE, tracker);
53 }
54
55 /**
56 * Called when the web application is being destroyed. Calls {@link FileCleaningTracker#exitWhenFinished()}.
57 *
58 * @param sce The servlet context, used for calling {@link #getFileCleaningTracker(ServletContext)}.
59 */
60 @Override
61 public void contextDestroyed(final ServletContextEvent sce) {
62 getFileCleaningTracker(sce.getServletContext()).exitWhenFinished();
63 }
64
65 /**
66 * Called when the web application is initialized. Does nothing.
67 *
68 * @param sce The servlet context, used for calling {@link #setFileCleaningTracker(ServletContext, FileCleaningTracker)}.
69 */
70 @Override
71 public void contextInitialized(final ServletContextEvent sce) {
72 setFileCleaningTracker(sce.getServletContext(), new FileCleaningTracker());
73 }
74
75 }