Examples of com.sun.messaging.jmq.io.MQObjectInputStream

com.sun.messaging.jmq.io.MQObjectInputStream

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.

                buffer.get(data);
                ByteArrayInputStream bais = new ByteArrayInputStream(data);


                // Use our version of ObjectInputStream so we can load old
                // serialized object from an old store, i.e. store migration
                ObjectInputStream ois = new MQObjectInputStream(bais);
        try {
        key = ois.readObject();
        } catch (Throwable e) {
        if (e instanceof ClassNotFoundException) {
      throw (ClassNotFoundException)e;
        } else {
      kex = e;
        }
    }


    try {
        value = ois.readObject();
    } catch (Throwable e) {
        if (e instanceof ClassNotFoundException) {
      throw (ClassNotFoundException)e;
        } else {
      vex = e;
        }
    }


                // Mark client data starting position
                if (maxClientDataSize > 0) {
                    // Since we've read in all data in the buffer, we need to
                    // reset the position back to client data starting position
                    int pos = limit - bais.available();
                    buffer.position(pos);
                    buffer.mark();
                }


    ois.close();
    bais.close();
      } catch (IOException e) {
    ex = e;
      }

            return null;
        }


        // Use our version of ObjectInputStream so we can load old
        // serialized object from an old store, i.e. store migration
        ObjectInputStream ois = new MQObjectInputStream(is);
  Object obj = ois.readObject();
  ois.close();
  return obj;
    }

Related Classes of com.sun.messaging.jmq.io.MQObjectInputStream

All source code are property of their respective owners. Java is a trademark of Sun Microsystems, Inc and owned by ORACLE Inc. Contact coftware#gmail.com.