/** starts work on a transaction branch */
public void start(Xid xid, int flags) throws XAException {
if (_xid != null) {
if (log.isLoggable(Level.FINER)) log.finer("connection pool start XA: rejoin " + this);
return;
}
if (flags == TMJOIN && _xid == null) {
// TMJOIN means the resource manager is managing more than one
// connection. The delegates tie the PoolItems managed by
// the same resource manager together.
_xid = xid;
UserTransactionImpl trans = _cm.getTransaction();
if (trans != null) {
ManagedPoolItem xaHead = trans.findJoin(this);
if (xaHead != null) {
_xaNext = xaHead._xaNext;
_xaHead = xaHead;
xaHead._xaNext = this;
}
}
}
// local transaction optimization
if (!_isXATransaction && flags != TMJOIN && _localTransaction != null) {
try {
if (log.isLoggable(Level.FINER))
log.finer("begin-local-XA: " + xid + " " + _localTransaction);
_localTransaction.begin();
} catch (ResourceException e) {
throw new XAExceptionWrapper(e);
}
_xid = xid;
return;
}
if (_xaResource != null) {
if (log.isLoggable(Level.FINER)) log.finer("start-XA: " + xid + " " + _xaResource);
_xaResource.start(xid, flags);
_isXATransaction = true;
} else {
if (log.isLoggable(Level.FINER))
log.finer("start-XA with non XA resource: " + xid + " " + _xaResource);
}
_xid = xid;
}
/** Restores the delegation for the entire chain. */
private void clearXid() {
_xid = null;
UserPoolItem shareHead = _shareHead;
_shareHead = null;
ManagedPoolItem xaPtr = _xaNext;
_xaHead = null;
_xaNext = null;
UserPoolItem assignedUserItem = null;
for (UserPoolItem ptr = shareHead; ptr != null; ptr = ptr.getShareNext()) {
if (ptr.getOwnPoolItem() == this) {
assignedUserItem = ptr;
break;
}
}
for (UserPoolItem ptr = shareHead; ptr != null; ptr = ptr.getShareNext()) {
if (assignedUserItem == null && ptr.getOwnPoolItem() == null) {
ptr.associatePoolItem(this);
assignedUserItem = ptr;
}
try {
ptr.reassociatePoolItem();
} catch (Throwable e) {
log.log(Level.WARNING, e.toString(), e);
}
}
while (xaPtr != null) {
ManagedPoolItem next = xaPtr._xaNext;
xaPtr._xaNext = null;
xaPtr._xaHead = null;
xaPtr.clearXid();
xaPtr = next;
}
if (assignedUserItem != null) {
// _shareHead = assignedUserItem;
// _shareHead.setShareNext(null);
} else if (_hasConnectionError) {
destroy();
} else {
toIdle();
}
}