PersistenceManagers perform several actions that affect the lifecycle state of persistence-capable instances. Each of these actions is represented by multiple methods in the PersistenceManager interface: one method that acts on a single persistence-capable object, such as makePersistent, and corresponding methods that accept a collection or array of persistence-capable objects, such as makePersistentAll.
makePersistent(All): Transitions transient instances to persistent-new. This action can only be used in the context of an active transaction. When the transaction is committed, the newly persisted instances will be inserted into the data store.
deletePersistent(All): Transitions persistent instances to persistent-deleted, or persistent-new instances to persistent-new-deleted. This action, too, can only be called during an active transaction. The given instance(s) will be deleted from the data store when the transaction is committed.
makeTransient(All): This action transitions persistent instances to transient. The instances immediately lose their association with the PersistenceManager and their JDO identity. The data store records for the instances are not modified.
This action can only be run on clean objects. If it is run on a dirty object, a JDOUserException is thrown.
makeTransactional(All): Use this action to make transient instances transient-transactional, or to bring persistent-nontransactional instances into the current transaction. In the latter case, the action must be invoked during an active transaction.
makeNontransactional(All): Transitions transient-clean instances to transient, and persistent-clean instances to persistent-nontransactional. Invoking this action on a dirty instance will result in a JDOUserException.
evict(All): Evicting an object tells the PersistenceManager that your application no longer needs that object. The object transitions to hollow and the PersistenceManager releases all strong references to it, allowing it to be garbage collected.
Calling the evictAll method with no parameters acts on all persistent-clean objects in the PersistenceManager's cache.
refresh(All): Use the refresh action to make sure the persistent state of an instance is in synch with the values in the data store. refresh is intended for long-running optimistic transactions in which there is a danger of seeing stale data.
Calling the refreshAll method with no parameters acts on all transactional objects in the cache. If there is no transaction in progress, the method is a no-op.
retrieve(All): Retrieving a persistent object immediately loads all of the object's persistent fields with their data store values. You might use this action to make sure an instance's fields are fully loaded before transitioning it to transient.