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org.apache.lenya.transaction
Interface UnitOfWork

All Known Subinterfaces:

Session, SharedItemStore

All Known Implementing Classes:

SessionImpl, UnitOfWorkImpl

public interface UnitOfWork

This is a "Unit of Work" object (see "Unit of Work" pattern by Martin Fowler, http://www.martinfowler.com/eaaCatalog/unitOfWork.html : the unit of work "maintains a list of objects affected by a business transaction and coordinates the writing out of changes and the resolution of concurrency problems".

In the current design, this interface allows a use case to generate documents, while ensuring that only one instance of a document is created. This access is provided by the DocumentIdentityMap's DocumentFactory.

This interface may be extended in the future to allow for access to further types of business objects.

Version:

$Id: UnitOfWork.java 534530 2007-05-02 16:24:22Z andreas $

Method Summary

void	commit() Commits the transaction.
Lock	createLock(Lockable lockable, int version) Creates a lock.
boolean	isDirty(Transactionable transactionable)
void	registerDirty(Transactionable object) Registers an object as modified.
void	registerNew(Transactionable object) Registers an object as new.
void	registerRemoved(Transactionable object) Registers an object as removed.
void	removeLock(Lockable lockable) Removes a lock.
void	rollback() Rolls the transaction back.

Method Detail

registerNew

void registerNew(Transactionable object)
                 throws TransactionException

Registers an object as new.

Parameters:

object - The object.

Throws:

TransactionException - if an error occurs.

registerDirty

void registerDirty(Transactionable object)
                   throws TransactionException

Registers an object as modified.

Parameters:

object - The object.

Throws:

TransactionException - if an error occurs.

registerRemoved

void registerRemoved(Transactionable object)
                     throws TransactionException

Registers an object as removed.

Parameters:

object - The object.

Throws:

TransactionException - if an error occurs.

commit

void commit()
            throws TransactionException

Commits the transaction.

Throws:

TransactionException - if an error occurs.

rollback

void rollback()
              throws TransactionException

Rolls the transaction back.

Throws:

TransactionException - if an error occurs.

isDirty

boolean isDirty(Transactionable transactionable)

Parameters:

transactionable - A transactionable.

Returns:

If the transactionable is registered as dirty.

createLock

Lock createLock(Lockable lockable,
                int version)
                throws TransactionException

Creates a lock.

Parameters:

lockable - The lockable.

version - The version.

Returns:

A lock.

Throws:

TransactionException - if a lock is already placed on this transactionable.

removeLock

void removeLock(Lockable lockable)
                throws TransactionException

Removes a lock.

Parameters:

lockable - The lockable.

Throws:

TransactionException - if no lock is placed on this transactionable.