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Java Source Code / Java Documentation » JMX » XMOJO » javax.management

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Java Document (Java Doc)

javax.management .PersistentMBean

PersistentMBean
public interface PersistentMBean (Code)
	This class is the interface to be implemented by MBeans that are meant to be persistent. MBeans supporting this interface should call the load method during construction in order to prime the MBean from the persistent store. In the case of a ModelMBean, the store method should be called by the MBeanServer based on the descriptors in the ModelMBean or by the MBean itself during normal processing of the ModelMBean.

Method Summary
public void	load() Instantiates thisMBean instance with the data found for the MBean in the persistent store.
public void	store() Captures the current state of this MMBean instance and writes it out to the persistent store.

Method Detail

load
public void load() throws MBeanException, RuntimeOperationsException, InstanceNotFoundException(Code)
	Instantiates thisMBean instance with the data found for the MBean in the persistent store. The data loaded could include attribute and operation values. This method should be called during construction or inialization of this instance, and before the MBean is registered with the MBeanServer. Object - returns the handle of the persistent persion of the MBean. exception: MBeanException - Wraps another exception or persistence is not supported. exception: RuntimeOperationsException - Wraps exceptions fromthe persistence mechanism. exception: InstanceNotFoundException - Could not find or load this MBeanfrom persistent storage.

store

public void store() throws MBeanException, RuntimeOperationsException, InstanceNotFoundException(Code)

Captures the current state of this MMBean instance and writes it out to the persistent store. The state stored could include attribute and operation values. If one of these methods of persistence is not supported a "serviceNotFound" exception will be thrown.

Persistance policy from the mbean and attribute descriptor is used to guide execution of this method. The MBean should be stored if 'persistPolicy' field is:

  != "never"
 = "always"
 = "onTimer" and now > 'lastPersistTime' + 'persistPeriod'
 = "NoMoreOftenThan" and now > 'lastPersistTime' + 'persistPeriod'
 
 Do not store the MBean if 'persistPolicy' field is:
 = "never"
 = "onUpdate"
 = "onTimer" && now < 'lastPersistTime' + 'persistPeriod'

exception:
  MBeanException - Wraps another exception or persistence is not supported.
exception:
  RuntimeOperationsException - Wraps exceptions fromthe persistence mechanism.
exception:
  InstanceNotFoundException - Could not find/access the persistant store.

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