de.schwarzrot.data.access
Class NullEntityManager

java.lang.Object
  de.schwarzrot.data.access.support.AbstractEntityManager
      de.schwarzrot.data.access.NullEntityManager

All Implemented Interfaces:

EntityManager

public class NullEntityManager
extends AbstractEntityManager

serves as a "remainder" for developers, that a certain entity is not handled the right way. Repository uses this "manager" as a fallback wich in turn throws an Exception for each call.

Author:

Reinhard Mantey

Field Summary

Fields inherited from class de.schwarzrot.data.access.support.AbstractEntityManager

appDefaults

Constructor Summary

NullEntityManager()

Method Summary

void	commit(TransactionResource<?> resource) used to persist all changes made during transaction.
TransactionResource<?>	createTransactionResource(Transaction t) create an abstract handle to storage.
void	execute(TransactionalOperation<?> tao) execute a single step of ApplicationTransaction
EntityDescriptor	getEntityDescriptor(Class<?> entityType, TransactionResource<?> res) accessor to description instances of entities.
void	releaseTransactionResource(TransactionResource<?> resource) free given storage handle
void	rollback(TransactionResource<?> handle) discards changes of given storage handle and marks Transaction as failed.

Methods inherited from class de.schwarzrot.data.access.support.AbstractEntityManager

dumpTypeCache, getApplicationDefaults, getApplicationName, getEntityCache, getEntityIntrospector, getEntityUtils, getName, getSchemaName, getSchemaName, getUserNameProvider, loadClass, needsTransaction, setEntityCache, setEntityIntrospector, setEntityUtils, setSchemaName, setSchemaName, setUserNameProvider

Methods inherited from class java.lang.Object

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

Constructor Detail

NullEntityManager

public NullEntityManager()

Method Detail

commit

public void commit(TransactionResource<?> resource)

Description copied from interface: EntityManager

used to persist all changes made during transaction.

Parameters:

resource - - an abstract handle to storage

createTransactionResource

public TransactionResource<?> createTransactionResource(Transaction t)
                                                 throws Exception

Description copied from interface: EntityManager

create an abstract handle to storage. TransactionResource is a wrapper to handle jdbc and preferences the same way.

Parameters:

t - - the transaction

Returns:

- a wrapped storage handle

Throws:

Exception - - depends on implementation

execute

public void execute(TransactionalOperation<?> tao)
             throws Exception

Description copied from interface: EntityManager

execute a single step of ApplicationTransaction

Parameters:

tao - - the transactional operation to execute

Throws:

Exception - - depends on implementation

getEntityDescriptor

public EntityDescriptor getEntityDescriptor(Class<?> entityType,
                                            TransactionResource<?> res)

Description copied from interface: EntityManager

accessor to description instances of entities. An EntityDescriptor holds all information needed by an EntityManager to handle instances of that entity. The EntityDescriptor may vary between different EntityManager s.

Parameters:

entityType - - the class of that entity

res - - the wrapped storage handle

Returns:

- the descriptor for that entity

releaseTransactionResource

public void releaseTransactionResource(TransactionResource<?> resource)

Description copied from interface: EntityManager

free given storage handle

Parameters:

resource - - a wrapped storage handle

rollback

public void rollback(TransactionResource<?> handle)

Description copied from interface: EntityManager

discards changes of given storage handle and marks Transaction as failed.

Parameters:

handle - - a wrapped storage handle