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//Source File Name: OracleXAResource.java
package com.sun.enterprise.transaction;
import java.sql.*;
import javax.transaction.xa.*;
import com.sun.enterprise.util.i18n.StringManager;
import java.util.logging.Logger;
import java.util.logging.Level;
import com.sun.logging.LogDomains;
/**
* This implements workaround for Oracle XAResource. Oracle's 8.1.7 XAResource implementation
* doesn't work fine while recovery. This class fires sql statements to achieve same.
*
* @author <a href="mailto:bala.dutt@sun.com">Bala Dutt</a>
* @version 1.0
*/
public class OracleXAResource extends XAResourceWrapper
{
// Sting Manager for Localization
private static final StringManager sm = StringManager.getManager(OracleXAResource.class);
private static final Logger _logger = LogDomains.getLogger(LogDomains.JTA_LOGGER);
/**
* Recovers list of xids in transaction table. Recover on oracle ignores flags sent to it, this method
* takes care of flags in addition to calling recoverList for xid list.
*
* @param flag an <code>int</code> value
* @return a <code>Xid[]</code> value
* @exception XAException if an error occurs
*/
public Xid[] recover(int flag) throws XAException {
if(flag==XAResource.TMNOFLAGS)
return null;
return recoverList(flag);
}
/**
* Fires a select statement so that transaction xids are updated and retrieve the xid list. Oracle
* doesn't update the xid's for sometime. After this update, recover of real oracle xa resource is
* is used get xid list.
*
* @return a <code>Xid[]</code> value
* @exception XAException if an error occurs
*/
private Xid [] recoverList(int flag) throws XAException{
Statement stmt = null;
ResultSet resultset = null;
Connection con = null;
try{
con=(Connection)m_xacon.getConnection(subject,null);
if(null == con)
// throw new XAException("Oracle XA Resource wrapper : connection could not be got");
throw new XAException(sm.getString("transaction.oracle_xa_wrapper_connection_failed"));
stmt = con.createStatement();
resultset = stmt.executeQuery(
"select pending.local_tran_id from SYS.PENDING_TRANS$ pending, SYS.DBA_2PC_NEIGHBORS");
resultset.close();
resultset = null;
stmt.close();
stmt=null;
return m_xacon.getXAResource().recover(flag);
}
catch(SQLException sqlexception){
//Trace.info("Failed to recover xid list");
// throw new XAException("oracle XA Resource wrapper : "+sqlexception);
throw new XAException(sm.getString("transaction.oracle_sqlexception_occurred",sqlexception));
}
catch(Exception e){
throw new XAException(sm.getString("transaction.oracle_unknownexception_occurred",e));
// throw new XAException("oracle XA Resource wrapper : "+e);
}
finally{
if(null != resultset)
try{
resultset.close();
}
catch(SQLException sqlexception1) { }
if(null != stmt)
try{
stmt.close();
}
catch(SQLException sqlexception2) { }
}
}
public void commit(Xid xid, boolean flag) throws XAException{
doRecovery(xid, true);
}
public void rollback(Xid xid) throws XAException{
doRecovery(xid, false);
}
/**
* Does actual recovery depending on boolean argument - true for commmit.
*
* @param xid a <code>Xid</code> value
* @param isCommit a <code>boolean</code> value
* @exception XAException if an error occurs
*/
private void doRecovery(Xid xid, boolean isCommit) throws XAException{
try {
if (isCommit)
m_xacon.getXAResource().commit(xid,true);
else
m_xacon.getXAResource().rollback(xid);
} catch (XAException ex) {
_logger.log(Level.FINEST," An XAException occurred while calling XAResource method " , ex);
} catch (Exception ex) {
_logger.log(Level.FINEST," An Exception occurred while calling XAResource method " , ex);
}
Statement stmt = null;
ResultSet resultset = null;
Connection con = null;
try{
con=(Connection)m_xacon.getConnection(subject,null);
if(null == con)
throw new XAException(sm.getString("transaction.oracle_xa_wrapper_connection_failed"));
// throw new XAException("Oracle XA Resource wrapper : connection could not be got");
stmt = con.createStatement();
resultset = stmt.executeQuery(
"select pending.local_tran_id from SYS.PENDING_TRANS$ pending, SYS.DBA_2PC_NEIGHBORS dba where pending.global_foreign_id = '"
+ toHexString(xid.getGlobalTransactionId()) +
"' and pending.local_tran_id = dba.local_tran_id and dba.branch = '"
+ toHexString(xid.getBranchQualifier()) +
"' and pending.state = 'prepared'");
if(resultset.next()){
String s = resultset.getString(1);
resultset.close();
resultset = null;
stmt.executeUpdate((isCommit ? "commit force '" : "rollback force '") + s + "'");
stmt.close();
stmt=null;
}
}
catch(SQLException sqlexception){
//Trace.info("Failed to recover " + xid+" "+ sqlexception);
_logger.log(Level.FINE," An SQLException during recovery " , sqlexception);
throw new XAException(sm.getString("transaction.oracle_sqlexception_occurred",sqlexception));
// throw new XAException("oracle XA Resource wrapper : "+sqlexception);
}
catch(Exception e){
//Trace.info("Exception while RecoveryTestRI recover "+e);
_logger.log(Level.FINE," An Exception during recovery " , e);
throw new XAException(sm.getString("transaction.oracle_unknownexception_occurred",e));
// throw new XAException("oracle XA Resource wrapper : "+e);
}
finally{
if(null != resultset)
try{
resultset.close();
}
catch(SQLException sqlexception1) { }
if(null != stmt)
try{
stmt.close();
}
catch(SQLException sqlexception2) { }
}
}
private static final char HEX_DIGITS[] = {
'0', '1', '2', '3', '4', '5', '6', '7', '8', '9',
'A', 'B', 'C', 'D', 'E', 'F'
};
/**
* Converts Xids into string that can be used in sql statements for oracle.
*
* @param abyte0[] a <code>byte</code> value
* @return a <code>String</code> value
*/
private static String toHexString(byte abyte0[]) {
StringBuffer stringbuffer = new StringBuffer();
if(null != abyte0 && 0 < abyte0.length) {
for(int i = 0; i < abyte0.length; i++) {
stringbuffer.append(HEX_DIGITS[(abyte0[i] & 0xf0) >> 4]);
stringbuffer.append(HEX_DIGITS[abyte0[i] & 0xf]);
}
return stringbuffer.toString();
} else {
return "";
}
}
}
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