mq5.0-source.main.mq-broker.broker-core.src.main.java.com.sun.messaging.jmq.jmsserver.persist.api.util.MQObjectInputStream Maven / Gradle / Ivy
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/*
* @(#)MQObjectInputStream.java 1.7 07/25/07
*/
package com.sun.messaging.jmq.jmsserver.persist.api.util;
import java.io.*;
/**
* A special subclasses of ObjectInputStream that is used for store migration.
* This class allow us to deserialize an old object format by allowing us to
* locate class file containing the definitions for the old object format that
* has been moved to a different package.
*
* As an example, we want to change the TransactionUID class, which would make
* it incompatible with the serialized version in the old store. First, we
* moved the original version of the TransactionUID to another package, e.g.
* com.sun.messaging.jmq.jmsserver.data.migration.TransactionUID. Next, we
* create a new version of com.sun.messaging.jmq.jmsserver.data.TransactionUID
* class. When loading the old serialized TransactionUID object, we use this
* class to locate the class definition of the old TransactionUID which has
* been moved to com.sun.messaging.jmq.jmsserver.data.migration.
*/
public class MQObjectInputStream extends ObjectInputStream {
public MQObjectInputStream(InputStream in) throws IOException {
super(in);
}
/**
* Overide the ObjectInputStream.resolveClass() to return the old class
* definition for serialized object prior to 3.7 release.
*/
protected Class resolveClass(ObjectStreamClass osc)
throws IOException, ClassNotFoundException {
Class clazz = null;
String name = osc.getName();
long serialVersion = osc.getSerialVersionUID();
// For performance we check serial version ID before the class name
if (serialVersion == 1518763750089861353L) {
if (name.equals("com.sun.messaging.jmq.jmsserver.data.TransactionAcknowledgement")) {
clazz = Class.forName("com.sun.messaging.jmq.jmsserver.data.migration.TransactionAcknowledgement");
}
} else if (serialVersion == -6848527428749630176L) {
if (name.equals("com.sun.messaging.jmq.jmsserver.data.TransactionState")) {
clazz = Class.forName("com.sun.messaging.jmq.jmsserver.data.migration.TransactionState");
}
} else if (serialVersion == 4438769866522991889L) {
if (name.equals("com.sun.messaging.jmq.jmsserver.data.TransactionState")) {
clazz = Class.forName("com.sun.messaging.jmq.jmsserver.data.migration.thrasher2.TransactionState");
}
} else if (serialVersion == 4132677693277056907L) {
if (name.equals("com.sun.messaging.jmq.jmsserver.data.TransactionState")) {
clazz = Class.forName("com.sun.messaging.jmq.jmsserver.data.migration.finch.TransactionState");
}
} else if (serialVersion == 3158474602500727000L) {
if (name.equals("com.sun.messaging.jmq.jmsserver.data.TransactionUID")) {
clazz = Class.forName("com.sun.messaging.jmq.jmsserver.data.migration.TransactionUID");
}
} else if (serialVersion == 5231476734057401743L) {
if (name.equals("com.sun.messaging.jmq.jmsserver.core.ConsumerUID")) {
clazz = Class.forName("com.sun.messaging.jmq.jmsserver.core.migration.ConsumerUID");
}
} else if (serialVersion == 8099322820906352261L) {
if (name.equals("com.sun.messaging.jmq.jmsserver.core.ConsumerUID")) {
clazz = Class.forName("com.sun.messaging.jmq.jmsserver.core.migration.thrasher.ConsumerUID");
}
} else if (serialVersion == 5642215309770752611L) {
if (name.equals("com.sun.messaging.jmq.jmsserver.persist.TransactionInfo")) {
clazz = Class.forName("com.sun.messaging.jmq.jmsserver.persist.api.TransactionInfo");
}
} else if (serialVersion == -6833553314062089908L) {
if (name.equals("com.sun.messaging.jmq.jmsserver.persist.HABrokerInfo")) {
clazz = Class.forName("com.sun.messaging.jmq.jmsserver.persist.api.HABrokerInfo");
}
}
// Return the class definition of old serialized object
if (clazz != null) {
return clazz;
}
return super.resolveClass(osc);
}
}