/**
* Execute database transactions in an isolated context.
*
* @param <T> return type
* @param callable transaction
* @return
*/
synchronized <T> T exec(Callable<T> callable) {
// We want to submit db jobs to an executor to isolate
// them from the current thread,
Future<T> future = _executor.submit(callable);
try {
return future.get();
} catch (Exception e) {
throw new ContextException("DbError", e);
}
}
public void shutdown() {
if (_inMemDs != null) {
shutdownInternalDB(_inMemDs);
_inMemDs = null;
}
if (_executor != null) {
_executor.shutdownNow();
_executor = null;
}
}