private void init() {
String s = settings.get(LAST_TRANSACTION_ID);
if (s != null) {
lastTransactionId = Long.parseLong(s);
lastTransactionIdStored = lastTransactionId;
}
Long lastKey = openTransactions.lastKey();
if (lastKey != null && lastKey.longValue() > lastTransactionId) {
throw DataUtils.newIllegalStateException("Last transaction not stored");
}
Cursor<Long> cursor = openTransactions.keyIterator(null);
while (cursor.hasNext()) {
long id = cursor.next();
Object[] data = openTransactions.get(id);
int status = (Integer) data[0];
String name = (String) data[1];
long[] next = {id + 1, -1};
long[] last = undoLog.floorKey(next);
if (last == null) {
// no entry
} else if (last[0] == id) {
Transaction t = new Transaction(this, id, status, name, last[1]);
t.setStored(true);
openTransactionMap.put(id, t);
}
}
}
private void testConcurrentIterate() {
MVStore s = new MVStore.Builder().pageSplitSize(3).open();
s.setVersionsToKeep(100);
final MVMap<Integer, Integer> map = s.openMap("test");
final int len = 10;
final Random r = new Random();
Task t =
new Task() {
@Override
public void call() throws Exception {
while (!stop) {
int x = r.nextInt(len);
if (r.nextBoolean()) {
map.remove(x);
} else {
map.put(x, r.nextInt(100));
}
}
}
};
t.execute();
for (int k = 0; k < 10000; k++) {
Iterator<Integer> it = map.keyIterator(r.nextInt(len));
long old = s.getCurrentVersion();
s.commit();
while (map.getVersion() == old) {
Thread.yield();
}
while (it.hasNext()) {
it.next();
}
}
t.get();
s.close();
}
/**
* Get the size of the map as seen by this transaction.
*
* @return the size
*/
public long getSize() {
// TODO this method is very slow
long size = 0;
Cursor<K> cursor = map.keyIterator(null);
while (cursor.hasNext()) {
K key = cursor.next();
if (get(key) != null) {
size++;
}
}
return size;
}