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/*
========== licence begin GPL
Copyright (C) 2002-2003 SAP AG
This program is free software; you can redistribute it and/or
modify it under the terms of the GNU General Public License
as published by the Free Software Foundation; either version 2
of the License, or (at your option) any later version.
This program is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
GNU General Public License for more details.
You should have received a copy of the GNU General Public License
along with this program; if not, write to the Free Software
Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
========== licence end
*/
package com.sap.dbtech.jdbcext;
import java.io.IOException;
import java.io.PrintWriter;
import java.sql.SQLException;
import java.util.ArrayList;
import java.util.Enumeration;
import java.util.Hashtable;
import java.util.Iterator;
import java.util.Properties;
import java.util.Vector;
import javax.naming.NamingException;
import javax.naming.Reference;
import javax.naming.Referenceable;
import javax.sql.XAConnection;
import javax.sql.XADataSource;
import javax.transaction.xa.Xid;
/**
* XA Data Source implementation of SAP DB.
*/
public class XADataSourceSapDB
extends DataSourceSapDBBase
implements XADataSource, Referenceable
{
private XATrace xatrace;
private boolean initialized;
private Hashtable transactions;
private GarbageCollector garbagecollector;
public XADataSourceSapDB()
{
initialized=false;
transactions=new Hashtable();
garbagecollector=new GarbageCollector(1000);
garbagecollector.start();
}
public XAConnection getXAConnection()
{
Properties p=(Properties) connectProperties.clone();
if(!initialized) {
createXATrace();
}
return new XAConnectionSapDB(p, this, xatrace);
}
public XAConnection getXAConnection(String user, String password)
{
Properties p=(Properties) connectProperties.clone();
p.setProperty("user", user);
p.setProperty("password", password);
if(!initialized) {
createXATrace();
}
return new XAConnectionSapDB(p, this, xatrace);
}
private synchronized void createXATrace()
{
try {
String s=getXATrace();
if(s==null) {
return;
// s="c:\\xatrace.prt";
}
PrintWriter pw=getLogWriter();
if(pw!=null && s.equalsIgnoreCase("true")) {
this.xatrace = new XATrace(pw);
}
if(pw==null) {
try {
this.xatrace = new XATrace(s);
} catch(IOException ioex) {
return;
}
}
} finally {
this.initialized=true;
}
}
XATransaction getXATransaction(Xid xid)
{
return (XATransaction) transactions.get(xid);
}
void addXATransaction(XATransaction xatrans)
{
transactions.put(xatrans.xid, xatrans);
}
void removeXATransaction(Xid xid)
{
transactions.remove(xid);
}
Xid[] getAllPrepared()
{
Vector result=new Vector();
Enumeration e=transactions.elements();
while(e.hasMoreElements()) {
XATransaction tx=(XATransaction)e.nextElement();
if(tx.getStatus()==XATransaction.STATUS_PREPARED) {
result.add(tx.xid);
}
}
return (Xid[]) result.toArray(new Xid[result.size()]);
}
private Object outer()
{
return this;
}
class GarbageCollector
extends Thread
{
ArrayList toBeRolledBack;
ArrayList toBeRemoved;
int delay;
GarbageCollector(int delay)
{
super("SAPDB XA Timeout Manager " + outer().hashCode());
toBeRolledBack=new ArrayList();
toBeRemoved=new ArrayList();
this.delay=delay;
}
public void run()
{
while(true) {
try { Thread.sleep(delay); } catch(InterruptedException ignore) {}
// System.err.println("XA Garbage collection start.");
toBeRemoved.clear();
toBeRolledBack.clear();
synchronized(outer()) {
Enumeration e=transactions.elements();
long t=System.currentTimeMillis();
while(e.hasMoreElements()) {
XATransaction tx=(XATransaction)e.nextElement();
if(tx.getStatus()==XATransaction.STATUS_ROLLED_BACK) {
toBeRemoved.add(tx.xid);
} else {
if(tx.timeOutTime < t) {
toBeRolledBack.add(tx.xid);
}
}
}
}
// at first the rollbacks ...
Iterator i=toBeRolledBack.iterator();
while(i.hasNext()) {
Xid xid=(Xid) i.next();
if(xatrace!=null) xatrace.trace(xid, "rollback (timeout)");
synchronized(outer()) {
XATransaction tx=getXATransaction(xid);
if(tx!=null) {
try {
tx.rollbackRelease();
} catch(SQLException sqlEx) {
try { tx.physicalConnection.close(); } catch(SQLException ignore) {}
tx.setStatus(XATransaction.STATUS_ROLLED_BACK);
}
}
}
}
Iterator j=toBeRemoved.iterator();
while(j.hasNext()) {
Xid xid=(Xid) j.next();
if(xatrace!=null) xatrace.trace(xid, "forget (timeout)");
synchronized(outer()) {
removeXATransaction(xid);
}
}
// System.err.println("XA Garbage collection completed.");
}
}
}
public Reference getReference() throws NamingException
{
return createReference(getClass().getName());
}
}
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