org.jboss.mx.persistence
Class ObjectStreamPersistenceManager

java.lang.Object
  org.jboss.mx.persistence.ObjectStreamPersistenceManager

All Implemented Interfaces:

PersistenceManager

public class ObjectStreamPersistenceManager
extends Object
implements PersistenceManager

Object Stream Persistence Manager.

Persists the MBean to the file system using an Object Stream. Includes code based on examples in Juha's JMX Book.

Object Streams written to disk are admittedly lacking in the area of "long-term", "portable", or "human-readable" persistence. They are fairly straightforward, however. Primarily, this class is useful for demonstration and "quick & dirty" persistence.

Version:

$Revision: 1.8.2.2 $

Author:

Matt Munz, Scott.Stark@jboss.org

Field Summary

protected boolean	isLoading A flag set to true to prevent attribute updates from within load triggering stores.
protected static org.jboss.logging.Logger	log

Constructor Summary

ObjectStreamPersistenceManager()

Method Summary

protected File	getStoreFile(MBeanInfo metadata, boolean createFile)
protected boolean	isLoading()
void	load(ModelMBeanInvoker mbean, MBeanInfo metadata) deserializes state from the object input stream
protected void	loadFromMetadata(ModelMBeanInvoker mbean, ModelMBeanInfo metadata) Obtain the attribute values from the metadata and invoke setAttributes on the mbean invoker.
protected void	setIsLoading(boolean newIsLoading)
void	store(MBeanInfo metadata) What we need to get here is 1) the persist location, and 2) the entire contents of the mbean.

Methods inherited from class java.lang.Object

clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait

Field Detail

log

protected static org.jboss.logging.Logger log

isLoading

protected boolean isLoading

A flag set to true to prevent attribute updates from within load triggering stores.

Constructor Detail

ObjectStreamPersistenceManager

public ObjectStreamPersistenceManager()

Method Detail

load

public void load(ModelMBeanInvoker mbean,
                 MBeanInfo metadata)
          throws MBeanException

deserializes state from the object input stream

Specified by:

load in interface PersistenceManager

Parameters:

mbean -

metadata -

Throws:

MBeanException

store

public void store(MBeanInfo metadata)
           throws MBeanException

What we need to get here is 1) the persist location, and 2) the entire contents of the mbean. #2 contains the entire contents (state) of the model object, as well as the meta data that the mbean provides. As such, serializing this (MBeanInfo) object (brute force) in effect serializes the model as well.

Specified by:

store in interface PersistenceManager

Parameters:

metadata -

Throws:

MBeanException

loadFromMetadata

protected void loadFromMetadata(ModelMBeanInvoker mbean,
                                ModelMBeanInfo metadata)

Obtain the attribute values from the metadata and invoke setAttributes on the mbean invoker.

Parameters:

mbean - the invoker and assocaited mbean resource

metadata - the metadata to use as the attributes value source

isLoading

protected boolean isLoading()

setIsLoading

protected void setIsLoading(boolean newIsLoading)

getStoreFile

protected File getStoreFile(MBeanInfo metadata,
                            boolean createFile)
                     throws MBeanException

Throws:

MBeanException