org.openejb.core.transaction
Class TxSupports

java.lang.Object
  |
  +--org.openejb.core.transaction.TransactionPolicy
        |
        +--org.openejb.core.transaction.TxSupports

public class TxSupports
extends TransactionPolicy

17.6.2.3 Supports The Container invokes an enterprise Bean method whose transaction attribute is set to Supports as follows. • If the client calls with a transaction context, the Container performs the same steps as described in the Required case. • If the client calls without a transaction context, the Container performs the same steps as described in the NotSupported case. The Supports transaction attribute must be used with caution. This is because of the different transactional semantics provided by the two possible modes of execution. Only the enterprise beans that will execute correctly in both modes should use the Supports transaction attribute.

Version:
$Revision: 1.1 $ $Date: 2002/01/21 08:09:03 $

Fields inherited from class org.openejb.core.transaction.TransactionPolicy
BeanManaged, container, logger, Manditory, Never, NotSupported, policyType, Required, RequiresNew, Supports
 
Constructor Summary
TxSupports()
           
TxSupports(TransactionContainer container)
           
 
Method Summary
 void afterInvoke(javax.ejb.EnterpriseBean instance, TransactionContext context)
           
 void beforeInvoke(javax.ejb.EnterpriseBean instance, TransactionContext context)
           
 void handleApplicationException(java.lang.Throwable appException, TransactionContext context)
          Container's action
 void handleSystemException(java.lang.Throwable sysException, javax.ejb.EnterpriseBean instance, TransactionContext context)
          A system exception is any exception that is not an Application Exception.
 
Methods inherited from class org.openejb.core.transaction.TransactionPolicy
beginTransaction, commitTransaction, discardBeanInstance, getContainer, getTxMngr, handleCallbackException, logSystemException, markTxRollbackOnly, rollbackTransaction, throwAppExceptionToServer, throwExceptionToServer, throwTxExceptionToServer
 
Methods inherited from class java.lang.Object
, clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait
 

Constructor Detail

TxSupports

public TxSupports(TransactionContainer container)

TxSupports

public TxSupports()
Method Detail

beforeInvoke

public void beforeInvoke(javax.ejb.EnterpriseBean instance,
                         TransactionContext context)
                  throws SystemException,
                         ApplicationException
Overrides:
beforeInvoke in class TransactionPolicy

afterInvoke

public void afterInvoke(javax.ejb.EnterpriseBean instance,
                        TransactionContext context)
                 throws ApplicationException,
                        SystemException
Overrides:
afterInvoke in class TransactionPolicy

handleApplicationException

public void handleApplicationException(java.lang.Throwable appException,
                                       TransactionContext context)
                                throws ApplicationException
Container's action

Re-throw AppException

Client's view

Client receives AppException. Can attempt to continue computation in the transaction, and eventually commit the transaction (the commit would fail if the instance called setRollbackOnly()).

Overrides:
handleApplicationException in class TransactionPolicy

handleSystemException

public void handleSystemException(java.lang.Throwable sysException,
                                  javax.ejb.EnterpriseBean instance,
                                  TransactionContext context)
                           throws ApplicationException,
                                  SystemException
A system exception is any exception that is not an Application Exception.
Container's action

  1. Log the exception or error so that the System Administrator is alerted of the problem.
  2. Mark the transaction for rollback.
  3. Discard instance. The Container must not invoke any business methods or container callbacks on the instance.
  4. Throw javax.transaction.TransactionRolledbackException to remote client; throw javax.ejb.TransactionRolledbackLocalException to local client.

Client's view

Receives javax.transaction.TransactionRolledbackException or javax.ejb.TransactionRolledbackLocalException. Continuing transaction is fruitless.

Overrides:
handleSystemException in class TransactionPolicy