public void rotateLogicalLogs() {
for (XaDataSource dataSource : dataSources.values()) {
try {
dataSource.rotateLogicalLog();
} catch (IOException e) {
msgLog.logMessage("Couldn't rotate logical log for " + dataSource.getName(), e);
}
}
}
/** Recover all datasources */
public void recover(Iterator<List<TxLog.Record>> knownDanglingRecordList) {
// contains NonCompletedTransaction that needs to be committed
List<NonCompletedTransaction> commitList = new ArrayList<NonCompletedTransaction>();
// contains Xids that should be rolledback
final List<Xid> rollbackList = new LinkedList<Xid>();
// key = Resource(branchId) value = XAResource
final Map<Resource, XaDataSource> resourceMap = new HashMap<Resource, XaDataSource>();
buildRecoveryInfo(commitList, rollbackList, resourceMap, knownDanglingRecordList);
// invoke recover on all xa resources found
final List<Xid> recoveredXidsList = new LinkedList<Xid>();
try {
for (XaDataSource xaDataSource : dataSources.values()) {
XAResource xaRes = xaDataSource.getXaConnection().getXaResource();
Xid xids[] = xaRes.recover(XAResource.TMNOFLAGS);
for (Xid xid : xids) {
if (XidImpl.isThisTm(xid.getGlobalTransactionId())) {
// linear search
if (rollbackList.contains(xid)) {
msgLog.logMessage("TM: Found pre commit " + xid + " rolling back ... ", true);
rollbackList.remove(xid);
xaRes.rollback(xid);
} else {
Resource resource = new Resource(xid.getBranchQualifier());
if (!resourceMap.containsKey(resource)) {
resourceMap.put(resource, xaDataSource);
}
recoveredXidsList.add(xid);
}
} else {
msgLog.warn("Unknown xid: " + xid);
}
}
}
// sort the commit list after sequence number
Collections.sort(commitList);
// go through and commit
for (NonCompletedTransaction nct : commitList) {
int seq = nct.getSequenceNumber();
Xid xids[] = nct.getXids();
msgLog.debug("Marked as commit tx-seq[" + seq + "] branch length: " + xids.length);
for (Xid xid : xids) {
if (!recoveredXidsList.contains(xid)) {
msgLog.debug(
"Tx-seq["
+ seq
+ "]["
+ xid
+ "] not found in recovered xid list, "
+ "assuming already committed");
continue;
}
recoveredXidsList.remove(xid);
Resource resource = new Resource(xid.getBranchQualifier());
if (!resourceMap.containsKey(resource)) {
final TransactionFailureException ex =
new TransactionFailureException("Couldn't find XAResource for " + xid);
throw logAndReturn("TM: recovery error", ex);
}
msgLog.debug("TM: Committing tx " + xid);
resourceMap.get(resource).getXaConnection().getXaResource().commit(xid, false);
}
}
// rollback the rest
for (Xid xid : recoveredXidsList) {
Resource resource = new Resource(xid.getBranchQualifier());
if (!resourceMap.containsKey(resource)) {
final TransactionFailureException ex =
new TransactionFailureException("Couldn't find XAResource for " + xid);
throw logAndReturn("TM: recovery error", ex);
}
msgLog.debug("TM: no match found for " + xid + " removing");
resourceMap.get(resource).getXaConnection().getXaResource().rollback(xid);
}
if (rollbackList.size() > 0) {
msgLog.debug(
"TxLog contained unresolved "
+ "xids that needed rollback. They couldn't be matched to "
+ "any of the XAResources recover list. "
+ "Assuming "
+ rollbackList.size()
+ " transactions already rolled back.");
}
// Rotate the logs of the participated data sources, making sure that
// done-records are written so that even if the tm log gets truncated,
// which it will be after this recovery, that transaction information
// doesn't get lost.
for (XaDataSource participant : MapUtil.reverse(resourceMap).keySet()) {
participant.rotateLogicalLog();
}
} catch (IOException | XAException e) {
throw logAndReturn(
"TM: recovery failed", new TransactionFailureException("Recovery failed.", e));
}
}