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package oracle.toplink.essentials.internal.ejb.cmp3.transaction.base;
import javax.persistence.RollbackException;
import oracle.toplink.essentials.exceptions.TransactionException;
import oracle.toplink.essentials.internal.ejb.cmp3.base.RepeatableWriteUnitOfWork;
import oracle.toplink.essentials.internal.localization.ExceptionLocalization;
/**
* INTERNAL:
* Base EntityTransactionImpl
* This is a thin wrapper around a UnitOfWork that implements functionality required
* by the EntityTransaction interface. The actual interface is implemented by two subclasses:
*
* @see oracle.toplink.essentials.internal.ejb.cmp3.transaction.EntityTransactionImpl
* @see oracle.toplink.essentials.internal.ejb.cmp3.transaction.jdk14.EntityTransactionImpl
*
* The EntityTransaction is a thin wrapper around a UnitOFWork.
*/
public class EntityTransactionImpl {
protected EntityTransactionWrapper wrapper;
protected boolean active = false;
protected boolean rollbackOnly = false;
public EntityTransactionImpl(EntityTransactionWrapper wrapper) {
this.wrapper = wrapper;
}
/**
* Start the current transaction. This can only be invoked if {@link #isActive()} returns
* <code>false</code>.
* @throws IllegalStateException if isActive() is true.
*/
public void begin(){
if (isActive()){
throw new IllegalStateException(TransactionException.transactionIsActive().getMessage());
}
if (this.wrapper.getEntityManager().isExtended()){
// so we have a resource local extended em so get the PC from the entity manager
this.wrapper.localUOW = this.wrapper.getEntityManager().getActivePersistenceContext(null);
this.wrapper.localUOW.setShouldTerminateTransaction(false);
}else{
this.wrapper.localUOW = new RepeatableWriteUnitOfWork(this.wrapper.getEntityManager().getServerSession().acquireClientSession());
this.wrapper.localUOW.setShouldTerminateTransaction(false);
this.wrapper.localUOW.setShouldCascadeCloneToJoinedRelationship(true);
}
this.active = true;
}
/**
* Commit the current transaction, writing any un-flushed changes to the database.
* This can only be invoked if {@link #isActive()} returns <code>true</code>.
* @throws IllegalStateException if isActive() is false.
*/
public void commit(){
if (!isActive()){
throw new IllegalStateException(TransactionException.transactionNotActive().getMessage());
}
try {
if (this.wrapper.localUOW != null){
this.wrapper.localUOW.setShouldTerminateTransaction(true);
if (! this.rollbackOnly){
if (this.wrapper.localUOW.shouldResumeUnitOfWorkOnTransactionCompletion()){
this.wrapper.localUOW.commitAndResume();
return;
}else{
this.wrapper.localUOW.commit();
// all change sets and are cleared, but the cache is kept
this.wrapper.localUOW.clearForClose(false);
}
} else {
throw new RollbackException(ExceptionLocalization.buildMessage("rollback_because_of_rollback_only"));
}
}
}catch (RuntimeException ex){
if (this.wrapper.localUOW != null){
wrapper.getEntityManager().removeExtendedPersistenceContext();
this.wrapper.localUOW.release();
this.wrapper.localUOW.getParent().release();
}
if(! this.rollbackOnly) {
throw new RollbackException(ex);
} else {
// it's a RollbackException
throw ex;
}
} finally {
this.active = false;
this.rollbackOnly = false;
wrapper.setLocalUnitOfWork(null);
}
}
/**
* Roll back the current transaction, discarding any changes that have happened
* in this transaction. This can only be invoked if {@link #isActive()} returns
* <code>true</code>.
* @throws IllegalStateException if isActive() is false.
*/
public void rollback(){
if (!isActive()){
throw new IllegalStateException(TransactionException.transactionNotActive().getMessage());
}
try{
if (wrapper.getLocalUnitOfWork() != null){
this.wrapper.localUOW.setShouldTerminateTransaction(true);
this.wrapper.localUOW.release();
this.wrapper.localUOW.getParent().release();
}
}finally{
this.active = false;
this.rollbackOnly = false;
wrapper.getEntityManager().removeExtendedPersistenceContext();
wrapper.setLocalUnitOfWork(null);
}
}
/**
* Mark the current transaction so that the only possible
* outcome of the transaction is for the transaction to be
* rolled back.
* @throws IllegalStateException if isActive() is false.
*/
public void setRollbackOnly(){
if (!isActive()){
throw new IllegalStateException(TransactionException.transactionNotActive().getMessage());
}
this.rollbackOnly = true;
}
/**
* Here incase a user does not commit or rollback an enityTransaction but just
* throws it away. If we do not rollback the txn the connection will go
* back into the pool.
*/
protected void finalize() throws Throwable{
try{
if (isActive())
this.rollback();
}finally{
super.finalize();
}
}
/**
* Determine whether the current transaction has been marked
* for rollback.
* @throws IllegalStateException if isActive() is false.
*/
public boolean getRollbackOnly(){
if (!isActive()){
throw new IllegalStateException(TransactionException.transactionNotActive().getMessage());
}
return this.rollbackOnly;
}
/**
* Check to see if the current transaction is in progress.
*/
public boolean isActive(){
return this.active;
}
}
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