/**
* Normally returns the current state of the log entry. However, this is never called during
* normal (non-recovery) execution. Therefore, the overhead of having to scan all of the logs (if
* it's not one we're using) is minimal.
*/
public int currentState(Uid objUid, String tName) throws ObjectStoreException {
InputObjectState ios = new InputObjectState();
/*
* TODO
*
* It's possible that the entry has been marked to be deleted but
* that the removal entry hasn't been written yet. We could check the
* async cache. However, since we really only care about this during
* recovery, it's not going to cause us problems anyway.
*/
if (allObjUids(tName, ios, StateStatus.OS_UNKNOWN)) {
Uid tempUid = new Uid(Uid.nullUid());
do {
try {
tempUid = UidHelper.unpackFrom(ios);
} catch (final Exception ex) {
ex.printStackTrace();
return StateStatus.OS_UNKNOWN;
}
if (tempUid.equals(objUid)) return StateStatus.OS_COMMITTED;
} while (tempUid.notEquals(Uid.nullUid()));
return StateStatus.OS_UNKNOWN;
} else return StateStatus.OS_UNKNOWN;
}
public static Xid getXid(Uid uid, boolean branch, int formatId) throws IllegalStateException {
XID xid;
if (branch) xid = getXid(uid, new Uid(), formatId, null);
else xid = getXid(uid, Uid.nullUid(), formatId, null);
return new XidImple(xid);
}
public InputObjectState() {
if (tsLogger.logger.isTraceEnabled()) {
tsLogger.logger.trace("InputObjectState::InputObjectState()");
}
bufferUid = new Uid(Uid.nullUid());
super._valid = false;
imageType = null;
}
private final boolean supportedLog(String logID) throws ObjectStoreException, IOException {
Uid id = new Uid(logID);
if (id.equals(Uid.nullUid())) return false;
ObjectStoreIterator iter =
new ObjectStoreIterator(
StoreManager.getRecoveryStore(),
TransactionTypeManager.getInstance().getTransactionType(_transactionType));
Uid u;
do {
u = iter.iterate();
if (u.equals(id)) return true;
} while (Uid.nullUid().notEquals(u));
return false;
}
public static Uid getUid(XID xid) {
if (xid == null || xid.formatID != FORMAT_ID) {
return Uid.nullUid();
}
// The Uid byte are the first in the data array, so we just pass
// in the whole thing and the additional trailing data is ignored.
Uid tx = new Uid(xid.data);
return tx;
}
private final void listLogs(String type) throws IOException {
InputObjectState buff = new InputObjectState();
try {
if (StoreManager.getRecoveryStore()
.allObjUids(TransactionTypeManager.getInstance().getTransactionType(type), buff)) {
Uid u = null;
do {
u = UidHelper.unpackFrom(buff);
if (Uid.nullUid().notEquals(u)) {
System.out.println("Log: " + u);
}
} while (Uid.nullUid().notEquals(u));
}
} catch (final ObjectStoreException ex) {
throw new IOException();
}
}
private static XID getXid(Uid uid, Uid branch, int formatId, Integer eisName)
throws IllegalStateException {
if (uid == null) {
throw new IllegalStateException();
}
XID xid = new XID();
xid.formatID = formatId;
// gtrid is uid byte form followed by as many chars of the node name as will fit.
byte[] gtridUid = uid.getBytes();
if (gtridUid.length > XID.MAXGTRIDSIZE) {
throw new IllegalStateException(); // Uid is too long!!!!
}
String nodeName = TxControl.getXANodeName();
int nodeNameLengthToUse = nodeName.getBytes().length;
xid.gtrid_length = gtridUid.length + nodeNameLengthToUse;
// src, srcPos, dest, destPos, length
System.arraycopy(gtridUid, 0, xid.data, 0, gtridUid.length);
System.arraycopy(nodeName.getBytes(), 0, xid.data, gtridUid.length, nodeNameLengthToUse);
if (branch.notEquals(Uid.nullUid())) {
// bqual is uid byte form plus EIS name.
byte[] bqualUid = branch.getBytes();
if (bqualUid.length > XID.MAXBQUALSIZE) {
throw new IllegalStateException(); // Uid is too long!!!!
}
int spareBqualBytes = XID.MAXBQUALSIZE - (bqualUid.length + 4);
xid.bqual_length = bqualUid.length + 4 + 4;
// src, srcPos, dest, destPos, length
int offset = xid.gtrid_length;
System.arraycopy(bqualUid, 0, xid.data, offset, bqualUid.length);
setEisName(xid, eisName);
} else {
/*
* Note: for some dbs we seem to be able to get
* away with setting the size field to the size
* of the actual branch. However, for Oracle,
* it appears as though it must always be 64.
* (At least for zero branches.)
*/
xid.data[xid.gtrid_length] = (byte) 0;
xid.bqual_length = 64;
}
return xid;
}
public static Uid getBranchUid(XID xid) {
if (xid == null || xid.formatID != FORMAT_ID) {
return Uid.nullUid();
}
byte[] bqual = new byte[xid.bqual_length];
System.arraycopy(xid.data, xid.gtrid_length, bqual, 0, xid.bqual_length);
// The Uid byte are the first in the data array, so we just pass
// in the whole thing and the additional trailing data is ignored.
Uid tx = new Uid(bqual);
return tx;
}
public final InputObjectState allObjUids() throws ObjectStoreException {
OutputObjectState state = new OutputObjectState();
Iterator<Uid> iter = _ids.keySet().iterator();
try {
while (iter.hasNext()) {
UidHelper.packInto(iter.next(), state);
}
// don't forget to null terminate
UidHelper.packInto(Uid.nullUid(), state);
} catch (final IOException ex) {
throw new ObjectStoreException(ex);
}
return new InputObjectState(state);
}
protected static OSRecordHolder readObjectStoreRecord(String type) {
try {
RecoveryStore recoveryStore = StoreManager.getRecoveryStore();
InputObjectState states = new InputObjectState();
if (recoveryStore.allObjUids(type, states) && states.notempty()) {
Uid uid = UidHelper.unpackFrom(states);
if (uid.notEquals(Uid.nullUid())) {
InputObjectState ios = recoveryStore.read_committed(uid, type);
return new OSRecordHolder(uid, type, ios);
}
}
} catch (Exception e) {
e.printStackTrace();
}
return null;
}
private static void clearObjectStore(String type) {
try {
RecoveryStore recoveryStore = StoreManager.getRecoveryStore();
InputObjectState states = new InputObjectState();
if (recoveryStore.allObjUids(type, states) && states.notempty()) {
boolean finished = false;
do {
Uid uid = UidHelper.unpackFrom(states);
if (uid.notEquals(Uid.nullUid())) {
recoveryStore.remove_committed(uid, type);
} else {
finished = true;
}
} while (!finished);
}
} catch (Exception e) {
e.printStackTrace();
}
}
/**
* This is a recovery-only method and should not be called during normal execution. As such we
* need to load in all of the logs we can find that aren't already loaded (or activated).
*/
public boolean allObjUids(String tName, InputObjectState state, int match)
throws ObjectStoreException {
/*
* match will always be OS_COMMITTED since that's all we ever write for
* the logs.
*/
// in case of asynchronous removals trigger the purger now.
_purger.trigger();
/*
* Get a list of logs. Load them in to memory if we aren't already
* working on them/it. But we can prune the entry once we're
* finished or the memory footprint will grow. We should do this
* for all frozen entries eventually too.
*/
InputObjectState logs = new InputObjectState();
OutputObjectState objUids = new OutputObjectState();
/*
* We never call this method except during recovery. As such we shouldn't
* need to worry about optimizations such as checking whether or not the
* log is in current working memory.
*/
if (!super.allObjUids(tName, logs, match)) return false;
else {
/*
* Now we have all of the log names let's attach to each one
* and locate the committed instances (not deleted.)
*/
Uid logName = new Uid(Uid.nullUid());
try {
do {
logName = UidHelper.unpackFrom(logs);
if (logName.notEquals(Uid.nullUid())) {
/*
* Could check to see if log is in current working memory.
*/
/*
* TODO
*
* First purge the log if we can, but we need to know that
* we're not playing with an instance that is being manipulated
* from another VM instance.
*/
ArrayList<InputObjectState> txs = scanLog(logName, tName);
if (txs.size() > 0) {
for (int i = 0; i < txs.size(); i++) {
UidHelper.packInto(txs.get(i).stateUid(), objUids);
}
}
}
} while (logName.notEquals(Uid.nullUid()));
// remember null terminator
UidHelper.packInto(Uid.nullUid(), objUids);
state.setBuffer(objUids.buffer());
} catch (final IOException ex) {
ex.printStackTrace();
return false;
}
return true;
}
}
static XID getXid(Uid uid, boolean branch, Integer eisName) throws IllegalStateException {
if (branch) return getXid(uid, new Uid(), FORMAT_ID, eisName);
else return getXid(uid, Uid.nullUid(), FORMAT_ID, eisName);
}
