org.jboss.narayana.compensations.impl

Class Participant

java.lang.Object

org.jboss.narayana.compensations.impl.Participant

All Implemented Interfaces:

BusinessAgreementWithParticipantCompletionParticipant, ConfirmCompletedParticipant

public class Participant
extends Object
implements BusinessAgreementWithParticipantCompletionParticipant, ConfirmCompletedParticipant

Author:

paul.robinson@redhat.com 22/03/2013

Constructor Summary

Constructors

Constructor and Description
Participant(Class<? extends CompensationHandler> compensationHandlerClass, Class<? extends ConfirmationHandler> confirmationHandlerClass, Class<? extends TransactionLoggedHandler> transactionLoggedHandlerClass, TxContext currentTX)

Method Summary

Modifier and Type	Method and Description
void	cancel() The transaction has cancelled, and the participant should undo any work.
void	close() The transaction has completed successfully.
void	compensate() The transaction has cancelled.
void	confirmCompleted(boolean confirmed) a participant callback use to notify the participant either that a recovery record has been written to the log and hence that uncommitted changes should be committed or that completion was cancelled and hence that uncommitted changes should be rolled back.
void	error() If the participant enquired as to the status of the transaction it was registered with and an unrecoverable error occurs then this operation will be invoked.
String	status()
void	unknown() If the participant enquires as to the status of the transaction it was registered with and that transaction is no longer available (has rolled back) then this operation will be invoked by the coordination service.

Methods inherited from class java.lang.Object

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

Constructor Detail

Participant

public Participant(Class<? extends CompensationHandler> compensationHandlerClass,
                   Class<? extends ConfirmationHandler> confirmationHandlerClass,
                   Class<? extends TransactionLoggedHandler> transactionLoggedHandlerClass,
                   TxContext currentTX)

Method Detail

confirmCompleted

public void confirmCompleted(boolean confirmed)

Description copied from interface: ConfirmCompletedParticipant

a participant callback use to notify the participant either that a recovery record has been written to the log and hence that uncommitted changes should be committed or that completion was cancelled and hence that uncommitted changes should be rolled back.

Specified by:

confirmCompleted in interface ConfirmCompletedParticipant

Parameters:

confirmed - true if the log record has been written and changes should be rolled forward and false if it has not been written and changes should be rolled back

close

public void close()
           throws WrongStateException,
                  SystemException

Description copied from interface: BusinessAgreementWithParticipantCompletionParticipant

The transaction has completed successfully. The participant previously informed the coordinator that it was ready to complete.

Specified by:

close in interface BusinessAgreementWithParticipantCompletionParticipant

Throws:

WrongStateException

SystemException

cancel

public void cancel()
            throws FaultedException,
                   WrongStateException,
                   SystemException

Description copied from interface: BusinessAgreementWithParticipantCompletionParticipant

The transaction has cancelled, and the participant should undo any work. The participant cannot have informed the coordinator that it has completed.

Specified by:

cancel in interface BusinessAgreementWithParticipantCompletionParticipant

Throws:

FaultedException

WrongStateException

SystemException

compensate

public void compensate()
                throws FaultedException,
                       WrongStateException,
                       SystemException

Description copied from interface: BusinessAgreementWithParticipantCompletionParticipant

The transaction has cancelled. The participant previously informed the coordinator that it had finished work but could compensate later if required, so it is now requested to do so.

Specified by:

compensate in interface BusinessAgreementWithParticipantCompletionParticipant

Throws:

FaultedException - if the participant was unable to perform the required compensation action because of an unrecoverable error. The coordinator is notified of this fault and as a result will stop resending compensation requests.

SystemException - if the participant was unable to perform the required compensation action because of a transient fault. The coordinator is not notified of this fault so it will retry the compensate request after a suitable timeout.

WrongStateException

status

public String status()
              throws SystemException

Specified by:

status in interface BusinessAgreementWithParticipantCompletionParticipant

Returns:

the status value.

Throws:

SystemException

unknown

public void unknown()
             throws SystemException

Description copied from interface: BusinessAgreementWithParticipantCompletionParticipant

If the participant enquires as to the status of the transaction it was registered with and that transaction is no longer available (has rolled back) then this operation will be invoked by the coordination service. This has been deprecated since the correct action when a GetStatus request fails is either to cancel or compensate the participant or to call error. GetStatus is only dispatched while the participant is completed so cancel will never be appropriate. compensate is called when the participant is unknown to the coordinator (it responds to the GetStatus request with an InvalidState fault). This will only happen if the coordinator crashed after the participant completed but before the client requested a close/cancel. error is called if any other fault response is received. So there is no other circumstance in which it would be appropriate for unknown to be called.

Specified by:

unknown in interface BusinessAgreementWithParticipantCompletionParticipant

Throws:

SystemException

error

public void error()
           throws SystemException

Description copied from interface: BusinessAgreementWithParticipantCompletionParticipant

If the participant enquired as to the status of the transaction it was registered with and an unrecoverable error occurs then this operation will be invoked.

Specified by:

error in interface BusinessAgreementWithParticipantCompletionParticipant

Throws:

SystemException