#include <it_bus/transaction_participant.h>
Inheritance diagram for IT_Bus::TransactionParticipant:
The operations on this interface are invoked during the lifetime of a transaction. If the transaction is being completed using a two phase commit protocol, the participant will have the opportunity to vote on the outcome of the transaction.
Participants wishing to be enlisted in a transaction should implement this interface and register themselves using the IT_Bus::TransactionManager::enlist() API.
Definition at line 26 of file transaction_participant.h.
Public Types | |
| enum | VoteOutcome |
| The possible outcomes from a call to the prepare() method during a two phase commit protocol. More... | |
Public Member Functions | |
| virtual void | commit_one_phase ()=0 |
| An event informing the participant that it should commit its state. | |
| virtual VoteOutcome | prepare ()=0 |
| An event informing the participant to prepare itself for the completion of the transaction. | |
| virtual void | commit ()=0 |
| An event informing the participant that it should commit its state. | |
| virtual void | rollback ()=0 |
| An event informing the participant that the transaction has been aborted and therefore it should rollback its state. | |
| virtual void | set_manager (TransactionManager *tx_manager)=0 |
| A callback event identifying the manager interface for the transaction within which it has been enlisted. | |
| virtual String | preferred_transaction_manager ()=0 |
| Query operation called after a participant has enlisted with the Artix transaction system to determine which type of transaction management interface it requires to be sent during the set_manager() event call. | |
The possible outcomes from a call to the prepare() method during a two phase commit protocol.
The 'VoteCommit' outcome indicates that a participants wishes the transaction to successfully complete. The 'VoteRollback' outcome indicates that a participants wishes the transaction to be aborted. The 'VoteReadOnly' outcome indicates that a participants represents a read-only resource and therefore does not wish to influence the outcome of the transaction. This outcome will not cause a transaction to be aborted.
Definition at line 43 of file transaction_participant.h.
| virtual void IT_Bus::TransactionParticipant::commit | ( | ) | [pure virtual] |
An event informing the participant that it should commit its state.
This is phase two in a two phase commit protocol.
| virtual void IT_Bus::TransactionParticipant::commit_one_phase | ( | ) | [pure virtual] |
An event informing the participant that it should commit its state.
This event indicates that a one phase commit protocol is in operation.
| virtual String IT_Bus::TransactionParticipant::preferred_transaction_manager | ( | ) | [pure virtual] |
Query operation called after a participant has enlisted with the Artix transaction system to determine which type of transaction management interface it requires to be sent during the set_manager() event call.
If the transaction manager preferred by a participant is different to that supported by the underlying transaction, Artix will interpose a transaction manager of the requested type between the participant and the transaction.
For example, the underlying transaction type is an OTS transaction, when called, the participant returns "ws-atomic-transaction" from this operation, indicating a preference for WS-AtomicTransaction style interactions. Artix will construct a WSAtomicTransactionManager that acts as an OTS resource manager to the underlying OTS transaction.
| virtual VoteOutcome IT_Bus::TransactionParticipant::prepare | ( | ) | [pure virtual] |
An event informing the participant to prepare itself for the completion of the transaction.
The participant is required to vote on the outcome of the transaction. This is phase one in a two phase commit protocol. If this method is called, either commit() or rollback() must follow.
| virtual void IT_Bus::TransactionParticipant::rollback | ( | ) | [pure virtual] |
An event informing the participant that the transaction has been aborted and therefore it should rollback its state.
This is phase two in a two phase commit protocol.
| virtual void IT_Bus::TransactionParticipant::set_manager | ( | TransactionManager * | tx_manager | ) | [pure virtual] |
A callback event identifying the manager interface for the transaction within which it has been enlisted.
For participants that require mode detailed interactions with the underlying transactional provider, this manager interface may be downcast to a more appropriate manager interface type. See preferred_transaction_manager() for more details.
| tx_manager | The management interface to the transaction. This manager interface can be downcast to a more specific interface derivation. For example, to an OTSTransactionManager, an XATransactionManager or to an WSAtomicTransactionManager interface. |
1.4.7