org.mmbase.module.core

Class TransactionManager

java.lang.Object

org.mmbase.module.core.TransactionManager

public class TransactionManager
extends Object

The MMBase transaction manager manages a group of changes.

Version:

$Id$

Author:

Rico Jansen

Javadoc:

Nested Class Summary

Nested Classes

Modifier and Type	Class and Description
static class	TransactionManager.Exists NO: The node does not exists yet, but will be created on commit YES: The node already existed befor the transaction started.

Field Summary

Fields

Modifier and Type	Field and Description
static TransactionManager	instance
protected Map<String,Collection<MMObjectNode>>	transactions

Method Summary

Modifier and Type	Method and Description
String	addNode(String transactionName, String owner, String tmpnumber)
String	cancel(Object user, String transactionName)
String	commit(Object user, String transactionName)
Collection<MMObjectNode>	createTransaction(String transactionName) Creates transaction with given name.
String	deleteObject(String transactionName, String owner, String tmpnumber)
protected Collection<MMObjectNode>	deleteTransaction(String transactionName) Removes the transaction with given name
String	findUserName(Object user)
static TransactionManager	getInstance()
TemporaryNodeManager	getTemporaryNodeManager()
Collection<MMObjectNode>	getTransaction(String transactionName) Returns transaction with given name.
Map<String,Collection<MMObjectNode>>	getTransactions() Return a an unmodifable Map with all transactions.
(package private) boolean	performCommits(Object user, Collection<MMObjectNode> nodes)
String	removeNode(String transactionName, String owner, String tmpnumber)
boolean	resolve(String transactionName)

Methods inherited from class java.lang.Object

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

Field Detail

transactions

protected final Map<String,Collection<MMObjectNode>> transactions

instance

public static TransactionManager instance

Method Detail

getInstance

public static TransactionManager getInstance()

Since:

MMBase-1.9

getTemporaryNodeManager

public TemporaryNodeManager getTemporaryNodeManager()

getTransaction

public Collection<MMObjectNode> getTransaction(String transactionName)
                                        throws TransactionManagerException

Returns transaction with given name. Syncrhonize on the returrned collection if you're going to iterate over it.

Parameters:

transactionName - The name of the transaction to return

Returns:

Collection containing the nodes in this transaction (as MMObjectNodes).

Throws:

TransactionManagerException - if the transaction with given name does not exist

getTransactions

public Map<String,Collection<MMObjectNode>> getTransactions()

Return a an unmodifable Map with all transactions. This map can be used to explore the existing transactions.

Since:

MMBase-1.9

createTransaction

public Collection<MMObjectNode> createTransaction(String transactionName)
                                           throws TransactionManagerException

Creates transaction with given name.

Parameters:

transactionName - The name of the transaction to return

Returns:

Collection containing the nodes in this transaction (so, this is an empty collection)

Throws:

TransactionManagerException - if the transaction with given name existed already

deleteTransaction

protected Collection<MMObjectNode> deleteTransaction(String transactionName)

Removes the transaction with given name

Returns:

the collection with nodes from the removed transaction or null if no transaction with this name existed

addNode

public String addNode(String transactionName,
                      String owner,
                      String tmpnumber)
               throws TransactionManagerException

Throws:

TransactionManagerException

removeNode

public String removeNode(String transactionName,
                         String owner,
                         String tmpnumber)
                  throws TransactionManagerException

Throws:

TransactionManagerException

deleteObject

public String deleteObject(String transactionName,
                           String owner,
                           String tmpnumber)
                    throws TransactionManagerException

Throws:

TransactionManagerException

cancel

public String cancel(Object user,
                     String transactionName)
              throws TransactionManagerException

Throws:

TransactionManagerException

resolve

public boolean resolve(String transactionName)
                throws TransactionManagerException

Throws:

TransactionManagerException

Since:

MMBase-1.9

To Do:

Review this stuff..

commit

public String commit(Object user,
                     String transactionName)
              throws TransactionManagerException

Throws:

TransactionManagerException

performCommits

boolean performCommits(Object user,
                       Collection<MMObjectNode> nodes)

findUserName

public String findUserName(Object user)