Hi,
I have a scenario where I try to delete a number of entities from the
datastore.
The operation fails with a ConcurrentModificationException, and I expect my
code below to handle this scenario and rollback.
The exception is thrown in transactionsHandler.commit(), more specifically
on transaction.commit(); - this causes the flow to go to the finally block,
but it turns out the transaction is no longer active, and thus the
transaction is not rolled back, causing an inconsistent datastore.
How should I handle the scenario instead?
Thanks,
-Louise
Code:
Transaction transaction = transactionHandler.begin();
try {
execute(transaction);//Delete entities from datastore
logger.info("Initiating commit of transaction");
transactionHandler.commit();
} finally {
transactionHandler.tryRollback();
}
public class TransactionHandler{
private Logger logger = Logger.getLogger(this.getClass().getName());
private Transaction transaction;
public Transaction begin(){
DatastoreService datastore =
DatastoreServiceFactory.getDatastoreService();
TransactionOptions options = TransactionOptions.Builder.withXG(true);
transaction = datastore.beginTransaction(options);
return transaction;
}
public void commit(){
if (transaction.isActive()){
transaction.commit();
logger.info("Transaction comittet");
}else{
logger.warning("Transaction was not active - transaction was not
comittet");
}
}
public void tryRollback(){
if (transaction.isActive()){
transaction.rollback();
logger.info("Transaction rolled back as transaction was still
active");
}else{
logger.info("Transaction was not active - transaction was not
rolledback");
}
}
}
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