@SuppressWarnings("unchecked")
private boolean packTransactionalInstance(final Field afield, OutputObjectState os) {
Object ptr = null;
try {
ptr = afield.get(_theObject);
if (ptr == null) {
os.packBoolean(false);
} else {
os.packBoolean(true);
UidHelper.packInto(_container.getUidForHandle((T) ptr), os);
}
} catch (final ClassCastException ex) {
System.err.println("Field " + ptr + " is not a transactional instance!");
return false;
} catch (final Exception ex) {
ex.printStackTrace();
return false;
}
return true;
}
/**
* 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 synchronized void unpackFrom(InputBuffer buff) throws IOException {
imageType = buff.unpackString();
bufferUid = UidHelper.unpackFrom(buff);
super.unpackFrom(buff);
}
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);
}
private boolean unpackTransactionalInstance(final Field afield, InputObjectState os) {
try {
boolean ptr = os.unpackBoolean();
if (!ptr) afield.set(_theObject, null);
else {
Uid u = UidHelper.unpackFrom(os);
afield.set(_theObject, _container.getHandle(u));
}
} catch (final Exception ex) {
ex.printStackTrace();
return false;
}
return true;
}
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();
}
}
@Test
public void test() {
RecoveryStore recoveryStore = StoreManager.getRecoveryStore();
OutputObjectState fluff = new OutputObjectState();
Uid kungfuTx = new Uid();
boolean passed = false;
final String tn = new AtomicAction().type();
try {
UidHelper.packInto(kungfuTx, fluff);
System.err.println("Creating dummy log");
recoveryStore.write_committed(kungfuTx, tn, fluff);
if (recoveryStore.currentState(kungfuTx, tn) == StateStatus.OS_COMMITTED) {
System.err.println("Wrote dummy transaction " + kungfuTx);
// quicker to deal with scanner directly
ExpiredTransactionScanner scanner =
new ExpiredTransactionScanner(tn, "/StateManager/ExpiredEntries");
scanner.scan();
scanner.scan();
if (recoveryStore.currentState(kungfuTx, tn) == StateStatus.OS_COMMITTED)
System.err.println("Transaction log not moved!");
else {
System.err.println("Transaction log moved!");
passed = true;
}
} else System.err.println("State is not committed!");
} catch (final Exception ex) {
ex.printStackTrace();
}
assertTrue(passed);
}
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;
}
}
