1   /*
   2    * Copyright (c) 2006, 2010, Oracle and/or its affiliates. All rights reserved.
   3    * ORACLE PROPRIETARY/CONFIDENTIAL. Use is subject to license terms.




















   4    */
   5 
   6   package java.io;
   7 
   8   /**
   9    * Context during upcalls from object stream to class-defined
  10    * readObject/writeObject methods.
  11    * Holds object currently being deserialized and descriptor for current class.
  12    *
  13    * This context keeps track of the thread it was constructed on, and allows
  14    * only a single call of defaultReadObject, readFields, defaultWriteObject
  15    * or writeFields which must be invoked on the same thread before the class's
  16    * readObject/writeObject method has returned.
  17    * If not set to the current thread, the getObj method throws NotActiveException.
  18    */
  19   final class SerialCallbackContext {
  20       private final Object obj;
  21       private final ObjectStreamClass desc;
  22       /**
  23        * Thread this context is in use by.
  24        * As this only works in one thread, we do not need to worry about thread-safety.
  25        */
  26       private Thread thread;
  27 
  28       public SerialCallbackContext(Object obj, ObjectStreamClass desc) {
  29           this.obj = obj;
  30           this.desc = desc;
  31           this.thread = Thread.currentThread();
  32       }
  33 
  34       public Object getObj() throws NotActiveException {
  35           checkAndSetUsed();
  36           return obj;
  37       }
  38 
  39       public ObjectStreamClass getDesc() {
  40           return desc;
  41       }
  42 
  43       private void checkAndSetUsed() throws NotActiveException {
  44           if (thread != Thread.currentThread()) {
  45                throw new NotActiveException(
  46                 "not in readObject invocation or fields already read");
  47           }
  48           thread = null;

  49       }
  50 
  51       public void setUsed() {
  52           thread = null;
  53       }
  54   }

   1 /*
   2  * Copyright (c) 2006, 2012, 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 
  26 package java.io;
  27 
  28 /**
  29  * Context during upcalls from object stream to class-defined
  30  * readObject/writeObject methods.
  31  * Holds object currently being deserialized and descriptor for current class.
  32  *
  33  * This context keeps track of the thread it was constructed on, and allows
  34  * only a single call of defaultReadObject, readFields, defaultWriteObject
  35  * or writeFields which must be invoked on the same thread before the class's
  36  * readObject/writeObject method has returned.
  37  * If not set to the current thread, the getObj method throws NotActiveException.
  38  */
  39 final class SerialCallbackContext {
  40     private final Object obj;
  41     private final ObjectStreamClass desc;
  42     /**
  43      * Thread this context is in use by.
  44      * As this only works in one thread, we do not need to worry about thread-safety.
  45      */
  46     private Thread thread;
  47 
  48     public SerialCallbackContext(Object obj, ObjectStreamClass desc) {
  49         this.obj = obj;
  50         this.desc = desc;
  51         this.thread = Thread.currentThread();
  52     }
  53 
  54     public Object getObj() throws NotActiveException {
  55         checkAndSetUsed();
  56         return obj;
  57     }
  58 
  59     public ObjectStreamClass getDesc() {
  60         return desc;
  61     }
  62 
  63     private void checkAndSetUsed() throws NotActiveException {
  64         if (thread != Thread.currentThread()) {
  65              throw new NotActiveException(
  66               "not in readObject invocation or fields already read");
  67         }
  68         thread = null;
  69         // Random come
  70     }
  71 
  72     public void setUsed() {
  73         thread = null;
  74     }
  75 }