//$Id: CMTTransaction.java 9680 2006-03-22 23:47:31Z epbernard $
package org.hibernate.transaction;
import javax.transaction.Status;
import javax.transaction.Synchronization;
import javax.transaction.SystemException;
import org.apache.commons.logging.Log;
import org.apache.commons.logging.LogFactory;
import org.hibernate.HibernateException;
import org.hibernate.Transaction;
import org.hibernate.TransactionException;
import org.hibernate.jdbc.JDBCContext;
import org.hibernate.util.JTAHelper;
/**
* Implements a basic transaction strategy for CMT transactions. All work is done
* in the context of the container managed transaction.
* @author Gavin King
*/
public class CMTTransaction implements Transaction {
private static final Log log = LogFactory.getLog(CMTTransaction.class);
protected final JDBCContext jdbcContext;
protected final TransactionFactory.Context transactionContext;
private boolean begun;
public CMTTransaction(JDBCContext jdbcContext, TransactionFactory.Context transactionContext) {
this.jdbcContext = jdbcContext;
this.transactionContext = transactionContext;
}
public void begin() throws HibernateException {
if (begun) {
return;
}
log.debug("begin");
boolean synchronization = jdbcContext.registerSynchronizationIfPossible();
if ( !synchronization ) {
throw new TransactionException("Could not register synchronization for container transaction");
}
begun = true;
jdbcContext.afterTransactionBegin(this);
}
public void commit() throws HibernateException {
if (!begun) {
throw new TransactionException("Transaction not successfully started");
}
log.debug("commit");
boolean flush = !transactionContext.isFlushModeNever() &&
!transactionContext.isFlushBeforeCompletionEnabled();
if (flush) {
transactionContext.managedFlush(); //if an exception occurs during flush, user must call rollback()
}
begun = false;
}
public void rollback() throws HibernateException {
if (!begun) {
throw new TransactionException("Transaction not successfully started");
}
log.debug("rollback");
try {
getTransaction().setRollbackOnly();
}
catch (SystemException se) {
log.error("Could not set transaction to rollback only", se);
throw new TransactionException("Could not set transaction to rollback only", se);
}
begun = false;
}
public javax.transaction.Transaction getTransaction() throws SystemException {
return transactionContext.getFactory().getTransactionManager().getTransaction();
}
public boolean isActive() throws TransactionException {
if (!begun) return false;
final int status;
try {
status = getTransaction().getStatus();
}
catch (SystemException se) {
log.error("Could not determine transaction status", se);
throw new TransactionException("Could not determine transaction status: ", se);
}
if (status==Status.STATUS_UNKNOWN) {
throw new TransactionException("Could not determine transaction status");
}
else {
return status==Status.STATUS_ACTIVE;
}
}
public boolean wasRolledBack() throws TransactionException {
if (!begun) return false;
final int status;
try {
status = getTransaction().getStatus();
}
catch (SystemException se) {
log.error("Could not determine transaction status", se);
throw new TransactionException("Could not determine transaction status", se);
}
if (status==Status.STATUS_UNKNOWN) {
throw new TransactionException("Could not determine transaction status");
}
else {
return JTAHelper.isRollback(status);
}
}
public boolean wasCommitted() throws TransactionException {
if ( !begun ) return false;
final int status;
try {
status = getTransaction().getStatus();
}
catch (SystemException se) {
log.error("Could not determine transaction status", se);
throw new TransactionException("Could not determine transaction status: ", se);
}
if (status==Status.STATUS_UNKNOWN) {
throw new TransactionException("Could not determine transaction status");
}
else {
return status==Status.STATUS_COMMITTED;
}
}
public void registerSynchronization(Synchronization sync) throws HibernateException {
try {
getTransaction().registerSynchronization(sync);
}
catch (Exception e) {
throw new TransactionException("Could not register synchronization", e);
}
}
public void setTimeout(int seconds) {
throw new UnsupportedOperationException("cannot set transaction timeout in CMT");
}
}
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