org.eclipse.persistence.transaction

Class AbstractTransactionController

java.lang.Object

org.eclipse.persistence.transaction.AbstractTransactionController

All Implemented Interfaces:

ExternalTransactionController

Direct Known Subclasses:

JTATransactionController

public abstract class AbstractTransactionController
extends java.lang.Object
implements ExternalTransactionController

Purpose: Abstract implementation of an ExternalTransactionController.

Description: This class implements the ExternalTransactionController interface. Concrete implementations of this class are responsible for performing the coordination with the external transaction manager through whatever means available to that manager. Different transaction services may do this in slightly different ways, but most common ones (JTA and JTS/OTS) will use a synchronization interface.

See Also:

AbstractSynchronizationListener, ExternalTransactionController

Field Summary

Fields

Modifier and Type	Field and Description
protected java.lang.ThreadLocal	activeUnitOfWorkThreadLocal PERF: Cache the active uow in a thread local.
protected java.util.concurrent.ConcurrentMap<java.lang.Object,AbstractSynchronizationListener>	currentlyProcessedListeners Non-null only in case sequencing callbacks are used: numSessionsRequiringSequencingCallback > 0
protected ExceptionHandler	exceptionHandler Allow exception in before/after completion to be wrapped.
protected SynchronizationListenerFactory	listenerFactory Generates listener instances for synchronization
protected int	numSessionsRequiringSequencingCallback more - the session is a session broker with several members requiring sequencing callbacks.
protected java.util.concurrent.ConcurrentMap<java.lang.Object,AbstractSynchronizationListener>	sequencingListeners Non-null only in case sequencing callbacks are used: numSessionsRequiringSequencingCallback > 0
protected org.eclipse.persistence.internal.sessions.AbstractSession	session The session this controller is responsible for controlling
protected java.util.concurrent.ConcurrentMap	unitsOfWork Table of external transaction object keys and unit of work values

Constructor Summary

Constructors

Constructor and Description
AbstractTransactionController() INTERNAL: Return a new controller.

Method Summary

Modifier and Type	Method and Description
void	addUnitOfWork(java.lang.Object transactionKey, org.eclipse.persistence.internal.sessions.UnitOfWorkImpl activeUnitOfWork) INTERNAL: Add a UnitOfWork object to the Hashtable keyed on the external transaction object.
protected abstract void	beginTransaction_impl() INTERNAL: Begin an external transaction.
void	beginTransaction(org.eclipse.persistence.internal.sessions.AbstractSession session) INTERNAL: Begin an external transaction.
void	bindToCurrentTransaction(org.eclipse.persistence.internal.sessions.UnitOfWorkImpl unitOfWork, org.eclipse.persistence.internal.sessions.AbstractSession session) INTERNAL: Associate the given unit of work and EclipseLink session with the active external transaction.
protected abstract boolean	canBeginTransaction_impl(java.lang.Object status) INTERNAL: Return true if the status indicates that a transaction can be started.
protected abstract boolean	canCommitTransaction_impl(java.lang.Object status) INTERNAL: Return true if the status indicates that a transaction can be committed.
protected abstract boolean	canIssueSQLToDatabase_impl(java.lang.Object status) INTERNAL: Return true if the status indicates that the SQL should be issued to the db.
protected abstract boolean	canMergeUnitOfWork_impl(java.lang.Object status) INTERNAL: Return true if the status indicates that the unit of work should be merged into the shared cache.
protected abstract boolean	canRollbackTransaction_impl(java.lang.Object status) INTERNAL: Return true if the status indicates that a transaction can be rolled back.
void	clearSequencingListeners() INTERNAL: Clears sequencing listeners.
protected abstract void	commitTransaction_impl() INTERNAL: Commit the external transaction.
void	commitTransaction(org.eclipse.persistence.internal.sessions.AbstractSession session) INTERNAL: Commit the external transaction.
org.eclipse.persistence.internal.sequencing.SequencingCallback	getActiveSequencingCallback(DatabaseSession dbSession, org.eclipse.persistence.internal.sequencing.SequencingCallbackFactory sequencingCallbackFactory) INTERNAL: Returns sequencingCallback for the current active external transaction.
org.eclipse.persistence.internal.sessions.UnitOfWorkImpl	getActiveUnitOfWork() INTERNAL: Return the active unit of work for the current external transaction.
ExceptionHandler	getExceptionHandler() Return the exception handler used to handle or wrap exceptions thrown in before/after completion.
SynchronizationListenerFactory	getListenerFactory() INTERNAL: Get the factory used to generate synchronization listeners.
org.eclipse.persistence.internal.sessions.AbstractSession	getSession() INTERNAL: Return the manager's session.
protected abstract java.lang.Object	getTransaction_impl() INTERNAL: Return the active external transaction for the calling thread, or null if none is currently active for this thread.
java.lang.Object	getTransaction() INTERNAL: Return the active external transaction object, or null if none is active.
protected abstract java.lang.Object	getTransactionKey_impl(java.lang.Object transaction) INTERNAL: Return a key for the specified external transaction object.
java.lang.Object	getTransactionKey(java.lang.Object transaction) INTERNAL: Return a key for the specified external transaction object.
protected abstract java.lang.Object	getTransactionStatus_impl() INTERNAL: Return the transaction status.
java.lang.Object	getTransactionStatus() INTERNAL: Return the transaction status.
java.util.Map	getUnitsOfWork() INTERNAL: Return the hashtable keyed on the external transaction objects with values that are the associated units of work.
boolean	hasActiveUnitOfWork() INTERNAL: Return true if there is a unit of work associated with the active external transaction.
void	initializeSequencingListeners() INTERNAL: Initializes sequencing listeners.
abstract boolean	isRolledBack_impl(java.lang.Object status) INTERNAL: Return true if the transaction is in the rolled back state.
boolean	isSequencingCallbackRequired() INTERNAL: Indicates whether sequencing callback may be required.
java.lang.Object	jndiLookup(java.lang.String jndiName) PUBLIC: Look up a given name in JNDI.
void	logTxStateTrace(org.eclipse.persistence.internal.sessions.AbstractSession session, java.lang.String msgInd, java.lang.Object status)
void	logTxTrace(org.eclipse.persistence.internal.sessions.AbstractSession session, java.lang.String msgInd, java.lang.Object[] args)
org.eclipse.persistence.internal.sessions.UnitOfWorkImpl	lookupActiveUnitOfWork() INTERNAL: Return the unit of work associated with the active external transaction.
org.eclipse.persistence.internal.sessions.UnitOfWorkImpl	lookupActiveUnitOfWork(java.lang.Object transaction) INTERNAL: Return the unit of work associated with the active external transaction.
protected abstract void	markTransactionForRollback_impl() INTERNAL: Mark the external transaction for rollback.
void	markTransactionForRollback() INTERNAL: Mark the external transaction for rollback.
boolean	noTransactionOrRolledBackOrCommited() INTERNAL: Used the EJB 3.0 to determine if a transaction is in a state where an EntityManager can be closed
int	numSessionsRequiringSequencingCallback() INTERNAL: Indicates how many sessions require sequencing callbacks.
protected abstract void	registerSynchronization_impl(AbstractSynchronizationListener listener, java.lang.Object txn) INTERNAL: Register the specified synchronization listener with the given active transaction.
void	registerSynchronizationListener(org.eclipse.persistence.internal.sessions.UnitOfWorkImpl uow, org.eclipse.persistence.internal.sessions.AbstractSession session) INTERNAL: Associate the given unit of work and EclipseLink session with the current external transaction.
void	removeSequencingListener(java.lang.Object transactionKey) INTERNAL: Clears sequencingCallbacks.
void	removeUnitOfWork(java.lang.Object transactionKey) INTERNAL: Remove the unit of work associated with the transaction passed in.
protected abstract void	rollbackTransaction_impl() INTERNAL: Roll back the external transaction.
void	rollbackTransaction(org.eclipse.persistence.internal.sessions.AbstractSession session) INTERNAL: Roll back the external transaction.
void	setExceptionHandler(ExceptionHandler exceptionHandler) Set an exception handler to handle or wrap exceptions thrown in before/after completion.
void	setListenerFactory(SynchronizationListenerFactory factory) INTERNAL: Set the factory used to generate synchronization listeners.
void	setSession(org.eclipse.persistence.internal.sessions.AbstractSession session) INTERNAL: Set the manager's session.
protected void	setUnitsOfWork(java.util.concurrent.ConcurrentMap unitsOfWork) INTERNAL: Set the table of transactions to units of work.
protected abstract java.lang.String	statusToString_impl(java.lang.Object status) INTERNAL: Convert the status to a string for tracing.

Methods inherited from class java.lang.Object

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

Field Detail

unitsOfWork

protected java.util.concurrent.ConcurrentMap unitsOfWork

Table of external transaction object keys and unit of work values

session

protected org.eclipse.persistence.internal.sessions.AbstractSession session

The session this controller is responsible for controlling

listenerFactory

protected SynchronizationListenerFactory listenerFactory

Generates listener instances for synchronization

activeUnitOfWorkThreadLocal

protected java.lang.ThreadLocal activeUnitOfWorkThreadLocal

PERF: Cache the active uow in a thread local.

sequencingListeners

protected java.util.concurrent.ConcurrentMap<java.lang.Object,AbstractSynchronizationListener> sequencingListeners

Non-null only in case sequencing callbacks are used: numSessionsRequiringSequencingCallback > 0

currentlyProcessedListeners

protected java.util.concurrent.ConcurrentMap<java.lang.Object,AbstractSynchronizationListener> currentlyProcessedListeners

Non-null only in case sequencing callbacks are used: numSessionsRequiringSequencingCallback > 0

numSessionsRequiringSequencingCallback

protected int numSessionsRequiringSequencingCallback

more - the session is a session broker with several members requiring sequencing callbacks.

exceptionHandler

protected ExceptionHandler exceptionHandler

Allow exception in before/after completion to be wrapped.

Constructor Detail

AbstractTransactionController

public AbstractTransactionController()

INTERNAL: Return a new controller.

Method Detail

getExceptionHandler

public ExceptionHandler getExceptionHandler()

Return the exception handler used to handle or wrap exceptions thrown in before/after completion.

Specified by:

getExceptionHandler in interface ExternalTransactionController

setExceptionHandler

public void setExceptionHandler(ExceptionHandler exceptionHandler)

Set an exception handler to handle or wrap exceptions thrown in before/after completion.

Specified by:

setExceptionHandler in interface ExternalTransactionController

bindToCurrentTransaction

public void bindToCurrentTransaction(org.eclipse.persistence.internal.sessions.UnitOfWorkImpl unitOfWork,
                                     org.eclipse.persistence.internal.sessions.AbstractSession session)

INTERNAL: Associate the given unit of work and EclipseLink session with the active external transaction. This may be done by whatever means supported by the transaction manager (i.e. through a synchronization protocol).

Parameters:

unitOfWork - The unit of work that is to be bound to the active transaction

session - The session ancestor of the unit of work

beginTransaction

public void beginTransaction(org.eclipse.persistence.internal.sessions.AbstractSession session)

INTERNAL: Begin an external transaction.

Specified by:

beginTransaction in interface ExternalTransactionController

Parameters:

session - The session for which the transaction is being begun.

commitTransaction

public void commitTransaction(org.eclipse.persistence.internal.sessions.AbstractSession session)

INTERNAL: Commit the external transaction.

Specified by:

commitTransaction in interface ExternalTransactionController

Parameters:

session - The session for which the transaction is being committed.

rollbackTransaction

public void rollbackTransaction(org.eclipse.persistence.internal.sessions.AbstractSession session)

INTERNAL: Roll back the external transaction.

Specified by:

rollbackTransaction in interface ExternalTransactionController

Parameters:

session - The session for which the transaction is being rolled back.

markTransactionForRollback

public void markTransactionForRollback()

INTERNAL: Mark the external transaction for rollback.

Specified by:

markTransactionForRollback in interface ExternalTransactionController

getTransaction

public java.lang.Object getTransaction()

INTERNAL: Return the active external transaction object, or null if none is active. This may be in whatever form the transaction system uses.

getTransactionKey

public java.lang.Object getTransactionKey(java.lang.Object transaction)

INTERNAL: Return a key for the specified external transaction object. The key is just something that can be inserted into a hashtable (must support hashCode() and equals() methods).

getTransactionStatus

public java.lang.Object getTransactionStatus()

INTERNAL: Return the transaction status. This may be any type of status or value, depending upon the transaction system.

noTransactionOrRolledBackOrCommited

public boolean noTransactionOrRolledBackOrCommited()

INTERNAL: Used the EJB 3.0 to determine if a transaction is in a state where an EntityManager can be closed

isRolledBack_impl

public abstract boolean isRolledBack_impl(java.lang.Object status)

INTERNAL: Return true if the transaction is in the rolled back state.

hasActiveUnitOfWork

public boolean hasActiveUnitOfWork()

INTERNAL: Return true if there is a unit of work associated with the active external transaction. Return false if no transaction is current, or if no uow has been associated with the active transaction yet.

getActiveUnitOfWork

public org.eclipse.persistence.internal.sessions.UnitOfWorkImpl getActiveUnitOfWork()

INTERNAL: Return the active unit of work for the current external transaction. If no transaction is active then return null. If a transaction is active but no unit of work has been bound to it then create and return one.

Specified by:

getActiveUnitOfWork in interface ExternalTransactionController

lookupActiveUnitOfWork

public org.eclipse.persistence.internal.sessions.UnitOfWorkImpl lookupActiveUnitOfWork()

INTERNAL: Return the unit of work associated with the active external transaction. Return null if no transaction is active, or if no uow has been associated with the active transaction yet.

lookupActiveUnitOfWork

public org.eclipse.persistence.internal.sessions.UnitOfWorkImpl lookupActiveUnitOfWork(java.lang.Object transaction)

INTERNAL: Return the unit of work associated with the active external transaction. Return null if no transaction is active, or if no uow has been associated with the active transaction yet.

addUnitOfWork

public void addUnitOfWork(java.lang.Object transactionKey,
                          org.eclipse.persistence.internal.sessions.UnitOfWorkImpl activeUnitOfWork)

INTERNAL: Add a UnitOfWork object to the Hashtable keyed on the external transaction object.

removeUnitOfWork

public void removeUnitOfWork(java.lang.Object transactionKey)

INTERNAL: Remove the unit of work associated with the transaction passed in.

getSession

public org.eclipse.persistence.internal.sessions.AbstractSession getSession()

INTERNAL: Return the manager's session.

Specified by:

getSession in interface ExternalTransactionController

setSession

public void setSession(org.eclipse.persistence.internal.sessions.AbstractSession session)

INTERNAL: Set the manager's session.

Specified by:

setSession in interface ExternalTransactionController

getUnitsOfWork

public java.util.Map getUnitsOfWork()

INTERNAL: Return the hashtable keyed on the external transaction objects with values that are the associated units of work.

setUnitsOfWork

protected void setUnitsOfWork(java.util.concurrent.ConcurrentMap unitsOfWork)

INTERNAL: Set the table of transactions to units of work.

getListenerFactory

public SynchronizationListenerFactory getListenerFactory()

INTERNAL: Get the factory used to generate synchronization listeners.

setListenerFactory

public void setListenerFactory(SynchronizationListenerFactory factory)

INTERNAL: Set the factory used to generate synchronization listeners. This should be set if a listener other than the default one is being used.

registerSynchronizationListener

public void registerSynchronizationListener(org.eclipse.persistence.internal.sessions.UnitOfWorkImpl uow,
                                            org.eclipse.persistence.internal.sessions.AbstractSession session)
                                     throws DatabaseException

INTERNAL: Associate the given unit of work and EclipseLink session with the current external transaction. This method is offered only for backwards compatibility.

Specified by:

registerSynchronizationListener in interface ExternalTransactionController

Throws:

DatabaseException

jndiLookup

public java.lang.Object jndiLookup(java.lang.String jndiName)

PUBLIC: Look up a given name in JNDI. This can be used by a subclass or even an application to look up transaction artifacts that are required for the implementation.

The lookup assumes that it is taking place on the server side, and that the InitialContext can be used without requiring any special properties.

Parameters:

jndiName - The name to look up

Returns:

The object bound in JNDI to the specified name

Throws:

TransactionException - Thrown in case of lookup failure

initializeSequencingListeners

public void initializeSequencingListeners()

INTERNAL: Initializes sequencing listeners. There are two methods calling this method: 1. setSession method - this could lead to initialization of sequencing listeners only if sequencing already connected (that would happen if setSession is called after session.login, which is normally not the case). 2. in the very end of connecting sequencing or adding descriptors to sequencing, after it's determined whether sequencing callbacks (and therefore listeners) will be required. In SessionBroker case each member's sequencing may call this method. Note that the number of sessions requiring callbacks may never decrease, therefore if isSequencingCallbackRequired method has returned true once, it will always return true after that (unless clearSequencingListeners method is called).

Specified by:

initializeSequencingListeners in interface ExternalTransactionController

getActiveSequencingCallback

public org.eclipse.persistence.internal.sequencing.SequencingCallback getActiveSequencingCallback(DatabaseSession dbSession,
                                                                                                  org.eclipse.persistence.internal.sequencing.SequencingCallbackFactory sequencingCallbackFactory)

INTERNAL: Returns sequencingCallback for the current active external transaction. DatabaseSession is passed for the sake of SessionBroker case. This method requires active external transaction.

Specified by:

getActiveSequencingCallback in interface ExternalTransactionController

clearSequencingListeners

public void clearSequencingListeners()

INTERNAL: Clears sequencing listeners. Called by initializeSequencingListeners and by sequencing on disconnect.

Specified by:

clearSequencingListeners in interface ExternalTransactionController

isSequencingCallbackRequired

public boolean isSequencingCallbackRequired()

INTERNAL: Indicates whether sequencing callback may be required.

numSessionsRequiringSequencingCallback

public int numSessionsRequiringSequencingCallback()

INTERNAL: Indicates how many sessions require sequencing callbacks.

removeSequencingListener

public void removeSequencingListener(java.lang.Object transactionKey)

INTERNAL: Clears sequencingCallbacks. Called by initializeSequencingCallbacks and by sequencing on disconnect.

logTxTrace

public void logTxTrace(org.eclipse.persistence.internal.sessions.AbstractSession session,
                       java.lang.String msgInd,
                       java.lang.Object[] args)

logTxStateTrace

public void logTxStateTrace(org.eclipse.persistence.internal.sessions.AbstractSession session,
                            java.lang.String msgInd,
                            java.lang.Object status)

registerSynchronization_impl

protected abstract void registerSynchronization_impl(AbstractSynchronizationListener listener,
                                                     java.lang.Object txn)
                                              throws java.lang.Exception

INTERNAL: Register the specified synchronization listener with the given active transaction.

Parameters:

listener - The synchronization listener created for this transaction

txn - The active transaction for which notification is being requested

Throws:

java.lang.Exception

getTransaction_impl

protected abstract java.lang.Object getTransaction_impl()
                                                 throws java.lang.Exception

INTERNAL: Return the active external transaction for the calling thread, or null if none is currently active for this thread.

Returns:

The active transaction object, or null if no transaction is active

Throws:

java.lang.Exception

getTransactionKey_impl

protected abstract java.lang.Object getTransactionKey_impl(java.lang.Object transaction)
                                                    throws java.lang.Exception

INTERNAL: Return a key for the specified external transaction object. The key is just something that can be inserted into a hashtable (must support hashCode() and equals() methods).

Parameters:

transaction - The transaction to which the returned key applies (may be null)

Returns:

A key for the passed in transaction, or null if no transaction specified

Throws:

java.lang.Exception

getTransactionStatus_impl

protected abstract java.lang.Object getTransactionStatus_impl()
                                                       throws java.lang.Exception

INTERNAL: Return the transaction status. This may be any type of status or value, depending upon the transaction system.

Returns:

The current transaction status

Throws:

java.lang.Exception

beginTransaction_impl

protected abstract void beginTransaction_impl()
                                       throws java.lang.Exception

INTERNAL: Begin an external transaction. Do this in a way appropriate to the transaction subsystem.

Throws:

java.lang.Exception

commitTransaction_impl

protected abstract void commitTransaction_impl()
                                        throws java.lang.Exception

INTERNAL: Commit the external transaction. Do this in a way appropriate to the transaction subsystem.

Throws:

java.lang.Exception

rollbackTransaction_impl

protected abstract void rollbackTransaction_impl()
                                          throws java.lang.Exception

INTERNAL: Roll back the external transaction. Do this in a way appropriate to the transaction subsystem.

Throws:

java.lang.Exception

markTransactionForRollback_impl

protected abstract void markTransactionForRollback_impl()
                                                 throws java.lang.Exception

INTERNAL: Mark the external transaction for rollback. Do this in a way appropriate to the transaction subsystem.

Throws:

java.lang.Exception

canBeginTransaction_impl

protected abstract boolean canBeginTransaction_impl(java.lang.Object status)

INTERNAL: Return true if the status indicates that a transaction can be started. This would normally mean that no transaction is currently active. The status is interpreted by the transaction subsystem.

Parameters:

status - The current transaction status

Returns:

true if the current state allows for a transaction to be started

canCommitTransaction_impl

protected abstract boolean canCommitTransaction_impl(java.lang.Object status)

INTERNAL: Return true if the status indicates that a transaction can be committed. This would normally mean that a transaction is currently active. The status is interpreted by the transaction subsystem.

Parameters:

status - The current transaction status

Returns:

true if the current state allows for a transaction to be committed

canRollbackTransaction_impl

protected abstract boolean canRollbackTransaction_impl(java.lang.Object status)

INTERNAL: Return true if the status indicates that a transaction can be rolled back. This would normally mean that a transaction is currently active. The status is interpreted by the transaction subsystem.

Parameters:

status - The current transaction status

Returns:

true if the current state allows for a transaction to be rolled back

canIssueSQLToDatabase_impl

protected abstract boolean canIssueSQLToDatabase_impl(java.lang.Object status)

INTERNAL: Return true if the status indicates that the SQL should be issued to the db. This would normally mean that a transaction was active and not being rolled back or marked for rollback. The status is interpreted by the transaction subsystem.

Parameters:

status - The current transaction status

Returns:

true if the current state allows for the SQL to be sent to the database

canMergeUnitOfWork_impl

protected abstract boolean canMergeUnitOfWork_impl(java.lang.Object status)

INTERNAL: Return true if the status indicates that the unit of work should be merged into the shared cache. This would normally mean that the transaction was committed successfully. The status is interpreted by the transaction subsystem.

Parameters:

status - The current transaction status

Returns:

true if the current state dictates that the unit of work should be merged

statusToString_impl

protected abstract java.lang.String statusToString_impl(java.lang.Object status)

INTERNAL: Convert the status to a string for tracing.