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    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   }

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