PersistentMBean (GNU Classpath 0.94-pre Documentation)

Beans may implement this interface in order to become persistent. The {@link #load()} method should be called on construction in order to reload the stored state. The {@link #store()} method should be called sometime during the bean's lifetime in order to create a persistent copy of the bean's instance data. This method may also be called by the {@link MBeanServer} as a result of the {@link Descriptor} of an {@link javax.management.modelmbean.ModelMBean}.

Since: 1.5

Method Summary
void	load() Instantiates the bean with the data previously stored using a call to {@link #store()}.
void	store() Captures the current state of the bean and stores it for future retrieval by the {@link #load()} method.

Method Detail

load

Instantiates the bean with the data previously stored using a call to {@link #store()}. The data stored can include values held by attributes as well as those returned by operations. This method should be called during construction or initialisation of the bean, before it becomes registered with an {@link MBeanServer}.

Throws: MBeanException if persistence is not supported, or another exception is thrown (which this then wraps). RuntimeOperationsException if the persistence mechanism throws an exception. InstanceNotFoundException if the bean can not be found in the persistent store.

store

Captures the current state of the bean and stores it for future retrieval by the {@link #load()} method. The data stored can include values held by attributes as well as those returned by operations.

Whether the state is stored or not depends on the persistPolicy field of the MBean/attribute descriptor. The state should be stored if the policy is set to any of the following:

always
onTimer and now is greater than or equal to lastPersistTime + persistPeriod.
noMoreOftenThan and now is greater than or equal to lastPersistTime + persistPeriod.
onUnregister

If the policy is set to any of the following, the state should not be stored:

never
onUpdate
onTimer and now is less than lastPersistTime + persistPeriod.

Interface PersistentMBean

Method Detail

load

store