org.fcrepo.services

Class TransactionService

java.lang.Object

org.fcrepo.services.TransactionService

@Component
public class TransactionService
extends Object

This is part of the Strawman implementation for Fedora transactions This service implements a simple Transaction service which is able to create/commit/rollback Transaction objects A Scheduled annotation is used for removing timed out Transactions

Author:

frank asseg

Field Summary

Fields

Modifier and Type	Field and Description
static long	REAP_INTERVAL

Constructor Summary

Constructors

Constructor and Description
TransactionService()

Method Summary

Methods

Modifier and Type	Method and Description
Transaction	beginTransaction(javax.jcr.Session sess) Create a new Transaction and add it to the currently open ones
Transaction	commit(String txid) Commit a Transaction with the given id
boolean	exists(String txid) Check if a Transaction exists
Transaction	getTransaction(String txid) Retrieve an open Transaction
void	removeAndRollbackExpired() Every REAP_INTERVAL milliseconds, check for expired transactions.
Transaction	rollback(String txid) Roll a Transaction back

Methods inherited from class java.lang.Object

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

Field Detail

REAP_INTERVAL

public static final long REAP_INTERVAL

See Also:

Constant Field Values

Constructor Detail

TransactionService

public TransactionService()

Method Detail

removeAndRollbackExpired

@Scheduled(fixedRate=1000L)
public void removeAndRollbackExpired()

Every REAP_INTERVAL milliseconds, check for expired transactions. If the tx is expired, roll it back and remove it from the registry.

beginTransaction

public Transaction beginTransaction(javax.jcr.Session sess)

Create a new Transaction and add it to the currently open ones

Parameters:

sess - The session to use for this Transaction

Returns:

the Transaction

getTransaction

public Transaction getTransaction(String txid)
                           throws TransactionMissingException

Retrieve an open Transaction

Parameters:

txid - the Id of the Transaction

Returns:

the Transaction

Throws:

TransactionMissingException

exists

public boolean exists(String txid)

Check if a Transaction exists

Parameters:

txid - the Id of the Transaction

Returns:

the Transaction

commit

public Transaction commit(String txid)
                   throws javax.jcr.RepositoryException

Commit a Transaction with the given id

Parameters:

txid - the id of the Transaction

Throws:

javax.jcr.RepositoryException

rollback

public Transaction rollback(String txid)
                     throws javax.jcr.RepositoryException

Roll a Transaction back

Parameters:

txid - the id of the Transaction

Returns:

the Transaction object

Throws:

javax.jcr.RepositoryException - if the Transaction could not be found