1 /*
2 * Copyright (c) 2006, 2012, Oracle and/or its affiliates. All rights reserved.
3 * ORACLE PROPRIETARY/CONFIDENTIAL. Use is subject to license terms.
4 *
5 *
6 *
7 *
8 *
9 *
10 *
11 *
12 *
13 *
14 *
15 *
16 *
17 *
18 *
19 *
20 *
21 *
22 *
23 *
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 public void check() throws NotActiveException {
64 if (thread != null && thread != Thread.currentThread()) {
65 throw new NotActiveException(
66 "expected thread: " + thread + ", but got: " + Thread.currentThread());
67 }
68 }
69
70 private void checkAndSetUsed() throws NotActiveException {
71 if (thread != Thread.currentThread()) {
72 throw new NotActiveException(
73 "not in readObject invocation or fields already read");
74 }
75 thread = null;
76 }
77
78 public void setUsed() {
79 thread = null;
80 }
81 }
82