| /* |
| * Copyright (c) 2005, 2010, Oracle and/or its affiliates. All rights reserved. |
| * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER. |
| * |
| * This code is free software; you can redistribute it and/or modify it |
| * under the terms of the GNU General Public License version 2 only, as |
| * published by the Free Software Foundation. Oracle designates this |
| * particular file as subject to the "Classpath" exception as provided |
| * by Oracle in the LICENSE file that accompanied this code. |
| * |
| * This code is distributed in the hope that it will be useful, but WITHOUT |
| * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or |
| * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License |
| * version 2 for more details (a copy is included in the LICENSE file that |
| * accompanied this code). |
| * |
| * You should have received a copy of the GNU General Public License version |
| * 2 along with this work; if not, write to the Free Software Foundation, |
| * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA. |
| * |
| * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA |
| * or visit www.oracle.com if you need additional information or have any |
| * questions. |
| */ |
| package java.io; |
| |
| import java.util.*; |
| import java.io.File; |
| |
| /** |
| * This class holds a set of filenames to be deleted on VM exit through a shutdown hook. |
| * A set is used both to prevent double-insertion of the same file as well as offer |
| * quick removal. |
| */ |
| |
| class DeleteOnExitHook { |
| private static LinkedHashSet<String> files = new LinkedHashSet<>(); |
| static { |
| // DeleteOnExitHook must be the last shutdown hook to be invoked. |
| // Application shutdown hooks may add the first file to the |
| // delete on exit list and cause the DeleteOnExitHook to be |
| // registered during shutdown in progress. So set the |
| // registerShutdownInProgress parameter to true. |
| sun.misc.SharedSecrets.getJavaLangAccess() |
| .registerShutdownHook(2 /* Shutdown hook invocation order */, |
| true /* register even if shutdown in progress */, |
| new Runnable() { |
| public void run() { |
| runHooks(); |
| } |
| } |
| ); |
| } |
| |
| private DeleteOnExitHook() {} |
| |
| static synchronized void add(String file) { |
| if(files == null) { |
| // DeleteOnExitHook is running. Too late to add a file |
| throw new IllegalStateException("Shutdown in progress"); |
| } |
| |
| files.add(file); |
| } |
| |
| static void runHooks() { |
| LinkedHashSet<String> theFiles; |
| |
| synchronized (DeleteOnExitHook.class) { |
| theFiles = files; |
| files = null; |
| } |
| |
| ArrayList<String> toBeDeleted = new ArrayList<>(theFiles); |
| |
| // reverse the list to maintain previous jdk deletion order. |
| // Last in first deleted. |
| Collections.reverse(toBeDeleted); |
| for (String filename : toBeDeleted) { |
| (new File(filename)).delete(); |
| } |
| } |
| } |