Essentially, we are looking for transaction support without JTA. Thus far, all
the JTA implementations we have found (JOTM, SimpleJTA, etc) requires some
database or file structure to log transaction logs. We're trying to set up a
clustered environment where there are no single points of failure. Thus making
most JTA implementations problematic.
Is it possible to have limited row level locking and releasing without JTA
implementation? We want to create a very simple and limited support for
transactions like this:
{start transaction or lock a row in table}
| val = get(key);
| val++;
| put(key, val);
| {release transaction or a row in table}
I am using TreeMap's _lock() and releaseAllLock() function, and it seems to be
doing absolutely nothing.
treeMap._lock(fqn, 0, true);
| if(null == treeMap.getObject(fqn)){
| treeMap.putObject(fqn, new Integer(0));
| }
| else{
| //Integer intVal = (Integer) rMap.get(key);
| Integer intVal = (Integer) treeMap.getObject(fqn);
|
| int iVal = intVal.intValue();
| System.out.println("Got: " + intVal + " Put: " +
(iVal+1));
| iVal++;
| treeMap.putObject(fqn, new Integer(iVal));
|
| }
| treeMap.releaseAllLocks(fqn);
I have two machines running this code, and I'll get situations where get()
returns the same number multiple times. Essentially it looks like the put isn't
getting replicated across. Any other ideas on how to do row level locking
perhaps?
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