private final ArrayList<InputObjectState> scanLog(final Uid logName, final String typeName)
throws ObjectStoreException {
/*
* Make sure no new entries can be created while we scan.
*/
synchronized (_lock) {
try {
String fname = genPathName(logName, typeName, StateStatus.OS_COMMITTED);
File fd = openAndLock(fname, FileLock.F_WRLCK, true);
RandomAccessFile iFile = new RandomAccessFile(fd, FILE_MODE);
// iFile.getChannel().lock();
try {
/*
* Create a list of ObjectState entries.
*/
ArrayList<InputObjectState> objectStates = new ArrayList<InputObjectState>();
iFile.seek(0); // make sure we're at the start
while (iFile.getFilePointer() < iFile.length()) {
byte[] buff = new byte[_redzone.length];
iFile.read(buff);
if (!redzoneProtected(buff)) {
// end
break;
/*
* TODO add an end-of-log entry and check for that. Currently just assume
* that no RZ means end, rather than corruption.
*/
} else {
int uidSize = iFile.readInt();
byte[] uidString = new byte[uidSize];
iFile.read(uidString);
Uid txId = new Uid(new String(uidString));
int imageSize = iFile.readInt();
byte[] imageState = new byte[imageSize];
iFile.read(imageState);
try {
InputObjectState state = new InputObjectState(txId, "", imageState);
objectStates.add(state);
} catch (final Exception ex) {
ex.printStackTrace();
throw new ObjectStoreException(ex.toString(), ex);
}
}
}
unlockAndClose(fd, iFile);
iFile = null;
/*
* At this stage we now have a list of ObjectState entries.
* Now we need to go through and prune the list. This is
* complicated by the fact that there can be 1.. entries for
* a specific transaction since we continually update the
* log as we drive recovery. If an entry hasn't been deleted
* then we will keep the latest one we find.
*/
/*
* First search for those entries that have been deleted.
*/
ArrayList<InputObjectState> deletedLogs = new ArrayList<InputObjectState>();
for (int i = 0; i < objectStates.size(); i++) {
InputObjectState curr = objectStates.get(i);
try {
if (Arrays.equals(curr.unpackBytes(), _removedState)) {
deletedLogs.add(curr);
} else curr.reread(); // don't forget to reset the read pointer!
} catch (final Exception ex) {
// if not a delete record then the first entry won't
// be an the defined byte array.
curr.reread(); // don't forget to reset the read pointer!
}
}
if (deletedLogs.size() > 0) {
/*
* make sure we remove them from the first list to save time.
*/
objectStates.removeAll(deletedLogs);
deleteEntries(objectStates, deletedLogs);
/*
* At this stage we should only have entries that refer
* to in-flight transactions. Go through the list and
* remove N-1 references for each transaction id.
*/
pruneEntries(objectStates);
/*
* Now return the list of committed entries.
*/
return objectStates;
} else return objectStates;
} finally {
if (iFile != null) unlockAndClose(fd, iFile);
}
} catch (final ObjectStoreException ex) {
ex.printStackTrace();
throw ex;
} catch (final Exception ex) {
ex.printStackTrace();
throw new ObjectStoreException(ex.toString(), ex);
}
}
}
public boolean restore_state(InputObjectState os, int t) {
boolean res = false;
try {
_heuristic = os.unpackInt();
_committed = os.unpackBoolean();
_tranID = XidImple.unpack(os);
_theXAResource = null;
_recoveryObject = null;
if (os.unpackInt() == RecoverableXAConnection.OBJECT_RECOVERY) {
_productName = os.unpackString();
_productVersion = os.unpackString();
_jndiName = os.unpackString();
boolean haveXAResource = os.unpackBoolean();
if (haveXAResource) {
try {
// Read the classname of the serialized XAResource
String className = os.unpackString();
byte[] b = os.unpackBytes();
ByteArrayInputStream s = new ByteArrayInputStream(b);
ObjectInputStream o = new ObjectInputStream(s);
// Give the list of deserializers a chance to deserialize the record
boolean deserialized = false;
Iterator<SerializableXAResourceDeserializer> iterator =
getXAResourceDeserializers().iterator();
while (iterator.hasNext()) {
SerializableXAResourceDeserializer proxyXAResourceDeserializer = iterator.next();
if (proxyXAResourceDeserializer.canDeserialze(className)) {
_theXAResource = proxyXAResourceDeserializer.deserialze(o);
deserialized = true;
break;
}
}
// Give it a go ourselves
if (!deserialized) {
_theXAResource = (XAResource) o.readObject();
}
o.close();
if (jtaLogger.logger.isTraceEnabled()) {
jtaLogger.logger.trace("XAResourceRecord.restore_state - XAResource de-serialized");
}
} catch (Exception ex) {
// not serializable in the first place!
jtaLogger.i18NLogger.warn_resources_arjunacore_restorestate(ex);
return false;
}
} else {
/*
* Lookup new XAResource via XARecoveryModule if possible.
*/
_theXAResource = getNewXAResource();
if (_theXAResource == null) {
jtaLogger.i18NLogger.warn_resources_arjunacore_norecoveryxa(toString());
/*
* Don't prevent tx from activating because there may be
* other participants that can still recover. Plus, we will
* try to get a new XAResource later for this instance.
*/
res = true;
}
}
} else {
String creatorName = os.unpackString();
_recoveryObject =
ClassloadingUtility.loadAndInstantiateClass(
RecoverableXAConnection.class, creatorName, null);
if (_recoveryObject == null) {
throw new ClassNotFoundException();
}
_recoveryObject.unpackFrom(os);
_theXAResource = _recoveryObject.getResource();
if (jtaLogger.logger.isTraceEnabled()) {
jtaLogger.logger.trace(
"XAResourceRecord.restore_state - XAResource got from " + creatorName);
}
}
res = true;
} catch (Exception e) {
jtaLogger.i18NLogger.warn_resources_arjunacore_restorestateerror(
_theXAResource.toString(), XAHelper.xidToString(_tranID), e);
res = false;
}
if (res) res = super.restore_state(os, t);
return res;
}