com.atomikos.datasource.xa.RecoveryScan Maven / Gradle / Ivy
/**
* Copyright (C) 2000-2017 Atomikos
*
* LICENSE CONDITIONS
*
* See http://www.atomikos.com/Main/WhichLicenseApplies for details.
*/
package com.atomikos.datasource.xa;
import java.util.ArrayList;
import java.util.List;
import javax.transaction.xa.XAException;
import javax.transaction.xa.XAResource;
import javax.transaction.xa.Xid;
public class RecoveryScan {
public static interface XidSelector {
boolean selects(Xid xid);
}
public static List recoverXids(XAResource xaResource, XidSelector selector) throws XAException {
List ret = new ArrayList();
boolean done = false;
int flags = XAResource.TMSTARTRSCAN;
Xid[] xidsFromLastScan = null;
List allRecoveredXidsSoFar = new ArrayList();
do {
xidsFromLastScan = xaResource.recover(flags);
flags = XAResource.TMNOFLAGS;
done = (xidsFromLastScan == null || xidsFromLastScan.length == 0);
if (!done) {
// TEMPTATIVELY SET done TO TRUE
// TO TOLERATE ORACLE 8.1.7 INFINITE
// LOOP (ALWAYS RETURNS SAME RECOVER
// SET). IF A NEW SET OF XIDS IS RETURNED
// THEN done WILL BE RESET TO FALSE
done = true;
for ( int i = 0; i < xidsFromLastScan.length; i++ ) {
XID xid = new XID ( xidsFromLastScan[i] );
// our own XID implements equals and hashCode properly
if (!allRecoveredXidsSoFar.contains(xid)) {
// a new xid is returned -> we can not be in a recovery loop -> go on
allRecoveredXidsSoFar.add(xid);
done = false;
if (selector.selects(xid)) {
ret.add(xid);
}
}
}
}
} while (!done);
return ret;
}
}