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package oracle.toplink.essentials.internal.ejb.cmp3.transaction.base;
import java.sql.Connection;
import java.sql.SQLException;
import javax.transaction.*;
import oracle.toplink.essentials.internal.ejb.cmp3.base.ExceptionFactory;
import oracle.toplink.essentials.internal.ejb.cmp3.jdbc.base.DataSourceImpl;
/**
* Implementation of JTA Transaction manager class.
*
* Currently support is limited to enlisting a single tx data source
*/
public class TransactionManagerImpl implements TransactionManager, UserTransaction {
// Not null when a transaction is active
TransactionImpl tx;
/************************/
/***** Internal API *****/
/************************/
private void debug(String s) {
System.out.println(s);
}
/*
* Used to create the single instance
*/
public TransactionManagerImpl() {
this.tx = null;
}
/*
* Return true if a transaction has been explicitly begun
*/
public boolean isTransactionActive() {
return tx != null;
}
/*
* Return a Connection if a transaction is active, otherwise return null
*/
public Connection getConnection(DataSourceImpl ds, String user, String password) throws SQLException {
return (tx == null) ? null : tx.getConnection(ds, user, password);
}
/************************************************************/
/***** Supported TransactionManager/UserTransaction API *****/
/************************************************************/
public void begin() throws NotSupportedException, SystemException {
debug("Tx - begin");
if (isTransactionActive()) {
throw new ExceptionFactory().txActiveException();
}
// New transaction created by virtue of Transaction existence
tx = new TransactionImpl();
}
public void commit() throws RollbackException, HeuristicMixedException, HeuristicRollbackException, SecurityException, IllegalStateException, SystemException {
debug("Tx - commit");
if (!isTransactionActive()) {
throw new ExceptionFactory().txNotActiveException();
}
try{
tx.commit();
}finally{
tx = null;
}
}
public int getStatus() throws SystemException {
return (!isTransactionActive()) ? Status.STATUS_NO_TRANSACTION : tx.getStatus();
}
public Transaction getTransaction() throws SystemException {
return tx;
}
public void rollback() throws IllegalStateException, SecurityException, SystemException {
debug("Tx - rollback");
if (!isTransactionActive()) {
throw new ExceptionFactory().txNotActiveException();
}
try{
tx.rollback();
}finally{
tx = null;
}
}
public void setRollbackOnly() throws IllegalStateException, SystemException {
debug("Tx - rollback");
if (!isTransactionActive()) {
throw new ExceptionFactory().txNotActiveException();
}
tx.setRollbackOnly();
}
/****************************************************************/
/***** NOT supported TransactionManager/UserTransaction API *****/
/****************************************************************/
public Transaction suspend() throws SystemException {
return null;
}
public void resume(Transaction transaction) throws InvalidTransactionException, IllegalStateException, SystemException {
// Do nothing
}
public void setTransactionTimeout(int i) throws SystemException {
// Do nothing
}
}