# Package javax.jdo.listener

This package contains the JDO specification listener interfaces and classes.

See: Description

- Interface Summary
  Interface | Description
  --- | ---
  AttachCallback | This interface is used to notify instances of attach events.
  AttachLifecycleListener | This interface is implemented by listeners to be notified of attach events.
  ClearCallback | This interface is used to notify instances of clear events.
  ClearLifecycleListener | This interface is implemented by listeners to be notified of clear events.
  CreateLifecycleListener | This interface is implemented by listeners to be notified of create events.
  DeleteCallback | This interface is used to notify instances of delete events.
  DeleteLifecycleListener | This interface is implemented by listeners to be notified of delete events.
  DetachCallback | This interface is used to notify instances of detach events.
  DetachLifecycleListener | This interface is implemented by listeners to be notified of detach events.
  DirtyLifecycleListener | This interface is implemented by listeners to be notified of dirty events.
  InstanceLifecycleListener | All lifecycle listeners extend from this base interface.
  LoadCallback | This interface is used to notify instances of load events.
  LoadLifecycleListener | This interface is implemented by listeners to be notified of load events.
  StoreCallback | This interface is used to notify instances of store events.
  StoreLifecycleListener | This interface is implemented by listeners to be notified of store events.

- Class Summary
  Class | Description
  --- | ---
  InstanceLifecycleEvent | This is the event class used in life cycle event notifications.

## Package javax.jdo.listener Description

This package contains the JDO specification listener interfaces and classes.

There are two kinds of interfaces defined to allow an application to manage life cycle changes to persistent objects.

The first kind is defined on the persistent domain class itself. This allows methods in the domain class to be called during life cycle events. The domain class implements one or more of the interfaces `AttachCallback`, `ClearCallback`, `DeleteCallback`, `DetachCallback`, `LoadCallback`, or `StoreCallback`. The methods in the interfaces are called during life cycle events.

The second kind is defined on an external class using the listener pattern. Instances of classes that implement one or more of the listener interfaces `AttachLifecycleListener`, `ClearLifecycleListener`, `CreateLifecycleListener`, `DeleteLifecycleListener`, `DetachLifecycleListener`, `DirtyLifecycleListener`, `LoadLifecycleListener`, or `StoreLifecycleListener` are registered with the PersistenceManager or PersistenceManagerFactory and receive callbacks during life cycle events of the persistent instances of interest.

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