Opening a TransactionMap requires that a transaction is started first:
MVStore s = new MVStore.Builder().fileName("map.dat").open();
ts = new TransactionStore(s);
ts.init();
Transaction tx = ts.begin();
TransactionMap<Integer, String> map = tx.openMap("map");
The call ts.begin() returns a Transaction that is used to open the
TransactionMap.
Below, next either commit or rollback is called for the started transaction:
tx.rollback(); //or tx.commit();
After rollback, for example, the TransactionMap is still open but is it
still allowed to use it for reading?
At least, the below loop can successfully read committed entries from the
TransactionMap.
//Iterate in key order
Integer firstKey = map.firstKey();
for (Iterator<Integer> iterator = map.keyIterator(firstKey, false);
iterator.hasNext();) {
Integer key = iterator.next();
String value= map.get(key);
System.out.println("key=" + key + " value=" + value);
}
Or more generally, what operations are allowed for an open TransactionMap
for which
commit or rollback is already called?
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