82 lines
2.9 KiB
Java
82 lines
2.9 KiB
Java
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/*
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* Copyright (c) 2006, 2012, Oracle and/or its affiliates. All rights reserved.
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* DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
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*
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* This code is free software; you can redistribute it and/or modify it
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* under the terms of the GNU General Public License version 2 only, as
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* published by the Free Software Foundation. Oracle designates this
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* particular file as subject to the "Classpath" exception as provided
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* by Oracle in the LICENSE file that accompanied this code.
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*
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* This code is distributed in the hope that it will be useful, but WITHOUT
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* ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
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* FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
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* version 2 for more details (a copy is included in the LICENSE file that
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* accompanied this code).
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*
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* You should have received a copy of the GNU General Public License version
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* 2 along with this work; if not, write to the Free Software Foundation,
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* Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
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*
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* Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
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* or visit www.oracle.com if you need additional information or have any
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* questions.
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*/
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package java.io;
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/**
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* Context during upcalls from object stream to class-defined
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* readObject/writeObject methods.
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* Holds object currently being deserialized and descriptor for current class.
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*
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* This context keeps track of the thread it was constructed on, and allows
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* only a single call of defaultReadObject, readFields, defaultWriteObject
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* or writeFields which must be invoked on the same thread before the class's
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* readObject/writeObject method has returned.
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* If not set to the current thread, the getObj method throws NotActiveException.
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*/
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final class SerialCallbackContext {
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private final Object obj;
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private final ObjectStreamClass desc;
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/**
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* Thread this context is in use by.
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* As this only works in one thread, we do not need to worry about thread-safety.
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*/
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private Thread thread;
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public SerialCallbackContext(Object obj, ObjectStreamClass desc) {
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this.obj = obj;
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this.desc = desc;
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this.thread = Thread.currentThread();
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}
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public Object getObj() throws NotActiveException {
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checkAndSetUsed();
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return obj;
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}
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public ObjectStreamClass getDesc() {
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return desc;
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}
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public void check() throws NotActiveException {
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if (thread != null && thread != Thread.currentThread()) {
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throw new NotActiveException(
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"expected thread: " + thread + ", but got: " + Thread.currentThread());
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}
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}
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public void checkAndSetUsed() throws NotActiveException {
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if (thread != Thread.currentThread()) {
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throw new NotActiveException(
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"not in readObject invocation or fields already read");
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}
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thread = null;
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}
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public void setUsed() {
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thread = null;
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}
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}
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