Showing the changes to java/pkg/java/io/DeleteOnExitHook.java (1 of 18352 files). Show all
Unified · Split
| @@ -0,0 +1,83 @@ | |||
| 1 | /* | ||
| 2 | * Copyright (c) 2005, 2010, Oracle and/or its affiliates. All rights reserved. | ||
| 3 | * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER. | ||
| 4 | * | ||
| 5 | * This code is free software; you can redistribute it and/or modify it | ||
| 6 | * under the terms of the GNU General Public License version 2 only, as | ||
| 7 | * published by the Free Software Foundation. Oracle designates this | ||
| 8 | * particular file as subject to the "Classpath" exception as provided | ||
| 9 | * by Oracle in the LICENSE file that accompanied this code. | ||
| 10 | * | ||
| 11 | * This code is distributed in the hope that it will be useful, but WITHOUT | ||
| 12 | * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or | ||
| 13 | * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License | ||
| 14 | * version 2 for more details (a copy is included in the LICENSE file that | ||
| 15 | * accompanied this code). | ||
| 16 | * | ||
| 17 | * You should have received a copy of the GNU General Public License version | ||
| 18 | * 2 along with this work; if not, write to the Free Software Foundation, | ||
| 19 | * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA. | ||
| 20 | * | ||
| 21 | * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA | ||
| 22 | * or visit www.oracle.com if you need additional information or have any | ||
| 23 | * questions. | ||
| 24 | */ | ||
| 25 | package java.io; | ||
| 26 | |||
| 27 | import java.util.*; | ||
| 28 | import java.io.File; | ||
| 29 | |||
| 30 | /** | ||
| 31 | * This class holds a set of filenames to be deleted on VM exit through a shutdown hook. | ||
| 32 | * A set is used both to prevent double-insertion of the same file as well as offer | ||
| 33 | * quick removal. | ||
| 34 | */ | ||
| 35 | |||
| 36 | class DeleteOnExitHook { | ||
| 37 | private static LinkedHashSet<String> files = new LinkedHashSet<>(); | ||
| 38 | static { | ||
| 39 | // DeleteOnExitHook must be the last shutdown hook to be invoked. | ||
| 40 | // Application shutdown hooks may add the first file to the | ||
| 41 | // delete on exit list and cause the DeleteOnExitHook to be | ||
| 42 | // registered during shutdown in progress. So set the | ||
| 43 | // registerShutdownInProgress parameter to true. | ||
| 44 | sun.misc.SharedSecrets.getJavaLangAccess() | ||
| 45 | .registerShutdownHook(2 /* Shutdown hook invocation order */, | ||
| 46 | true /* register even if shutdown in progress */, | ||
| 47 | new Runnable() { | ||
| 48 | public void run() { | ||
| 49 | runHooks(); | ||
| 50 | } | ||
| 51 | } | ||
| 52 | ); | ||
| 53 | } | ||
| 54 | |||
| 55 | private DeleteOnExitHook() {} | ||
| 56 | |||
| 57 | static synchronized void add(String file) { | ||
| 58 | if(files == null) { | ||
| 59 | // DeleteOnExitHook is running. Too late to add a file | ||
| 60 | throw new IllegalStateException("Shutdown in progress"); | ||
| 61 | } | ||
| 62 | |||
| 63 | files.add(file); | ||
| 64 | } | ||
| 65 | |||
| 66 | static void runHooks() { | ||
| 67 | LinkedHashSet<String> theFiles; | ||
| 68 | |||
| 69 | synchronized (DeleteOnExitHook.class) { | ||
| 70 | theFiles = files; | ||
| 71 | files = null; | ||
| 72 | } | ||
| 73 | |||
| 74 | ArrayList<String> toBeDeleted = new ArrayList<>(theFiles); | ||
| 75 | |||
| 76 | // reverse the list to maintain previous jdk deletion order. | ||
| 77 | // Last in first deleted. | ||
| 78 | Collections.reverse(toBeDeleted); | ||
| 79 | for (String filename : toBeDeleted) { | ||
| 80 | (new File(filename)).delete(); | ||
| 81 | } | ||
| 82 | } | ||
| 83 | } | ||