com.ovea.tajin.server.util.DeleteOnExitHook Maven / Gradle / Ivy
/**
* Copyright (C) 2011 Ovea
*
* Licensed 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 com.ovea.tajin.server.util;
import java.io.File;
import java.util.ArrayList;
import java.util.Collections;
import java.util.LinkedHashSet;
final class DeleteOnExitHook implements Runnable {
private static final DeleteOnExitHook instance = new DeleteOnExitHook();
private LinkedHashSet files = new LinkedHashSet();
private DeleteOnExitHook() {
Runtime.getRuntime().addShutdownHook(new Thread(this, "DeleteOnExitHookThread"));
}
public void run() {
LinkedHashSet theFiles;
synchronized (files) {
theFiles = files;
files = null;
}
ArrayList toBeDeleted = new ArrayList(theFiles);
// Reverse the list to maintain previous jdk deletion order.
// Last in first deleted.
Collections.reverse(toBeDeleted);
for (File file : toBeDeleted) {
deleteSubFolders(file);
file.delete();
}
}
public void deleteSubFolders(File file) {
File[] files = file.listFiles();
for (File f : files) {
if (f.isDirectory()) {
deleteSubFolders(f);
}
f.delete();
}
}
public DeleteOnExitHook add(File file) {
synchronized (files) {
if (files == null) {
throw new IllegalStateException("Shutdown in progress");
}
files.add(file);
}
return this;
}
public static DeleteOnExitHook instance() {
return instance;
}
}