/**
* Callback executed when transaction has return from NDB
*/
static void
callback(int result, NdbTransaction* trans, void* aObject)
{
async_callback_t * cbData = (async_callback_t *)aObject;
if (result<0)
{
/**
* Error: Temporary or permanent?
*/
if (asynchErrorHandler(trans, (Ndb*)cbData->ndb))
{
closeTransaction((Ndb*)cbData->ndb, cbData);
while(populate((Ndb*)cbData->ndb, cbData->data, cbData) < 0)
milliSleep(10);
}
else
{
std::cout << "Restore: Failed to restore data "
<< "due to a unrecoverable error. Exiting..." << std::endl;
delete cbData;
asynchExitHandler((Ndb*)cbData->ndb);
}
}
else
{
/**
* OK! close transaction
*/
closeTransaction((Ndb*)cbData->ndb, cbData);
delete cbData;
}
}
void BackupRestore::tuple_a(restore_callback_t *cb)
{
while (cb->retries < 10)
{
/**
* start transactions
*/
cb->connection = m_ndb->startTransaction();
if (cb->connection == NULL)
{
/*
if (asynchErrorHandler(cb->connection, m_ndb))
{
cb->retries++;
continue;
}
*/
asynchExitHandler();
} // if
const TupleS &tup = *(cb->tup);
const TableS * table = tup.getTable();
NdbOperation * op = cb->connection->getNdbOperation(table->getTableName());
if (op == NULL)
{
if (asynchErrorHandler(cb->connection, m_ndb))
{
cb->retries++;
continue;
}
asynchExitHandler();
} // if
if (op->writeTuple() == -1)
{
if (asynchErrorHandler(cb->connection, m_ndb))
{
cb->retries++;
continue;
}
asynchExitHandler();
} // if
Uint32 ret = 0;
for (int i = 0; i < tup.getNoOfAttributes(); i++)
{
const AttributeS * attr = tup[i];
int size = attr->Desc->size;
int arraySize = attr->Desc->arraySize;
char * dataPtr = attr->Data.string_value;
Uint32 length = (size * arraySize) / 8;
if (attr->Desc->m_column->getPrimaryKey())
{
ret = op->equal(i, dataPtr, length);
}
else
{
if (attr->Data.null)
ret = op->setValue(i, NULL, 0);
else
ret = op->setValue(i, dataPtr, length);
}
if (ret<0)
{
ndbout_c("Column: %d type %d",i,
tup.getTable()->m_dictTable->getColumn(i)->getType());
if (asynchErrorHandler(cb->connection, m_ndb))
{
cb->retries++;
break;
}
asynchExitHandler();
}
}
if (ret < 0)
continue;
// Prepare transaction (the transaction is NOT yet sent to NDB)
cb->connection->executeAsynchPrepare(Commit, &callback, cb);
m_transactions++;
}
ndbout_c("Unable to recover from errors. Exiting...");
asynchExitHandler();
}
/************************************************************************
* populate()
* 1. Prepare 'parallelism' number of insert transactions.
* 2. Send transactions to NDB and wait for callbacks to execute
*/
int populate(Ndb * myNdb, int data, async_callback_t * cbData)
{
NdbOperation* myNdbOperation; // For operations
const NdbDictionary::Dictionary* myDict= myNdb->getDictionary();
const NdbDictionary::Table *myTable= myDict->getTable("api_async");
if (myTable == NULL)
APIERROR(myDict->getNdbError());
async_callback_t * cb;
int retries = 0;
int current = 0;
for(int i=0; i<1024; i++)
{
if(transaction[i].used == 0)
{
current = i;
if (cbData == 0)
{
/**
* We already have a callback
* This is an absolutely new transaction
*/
cb = new async_callback_t;
cb->retries = 0;
}
else
{
/**
* We already have a callback
*/
cb =cbData;
retries = cbData->retries;
}
/**
* Set data used by the callback
*/
cb->ndb = myNdb; //handle to Ndb object so that we can close transaction
// in the callback (alt. make myNdb global).
cb->data = data; //this is the data we want to insert
cb->transaction = current; //This is the number (id) of this transaction
transaction[current].used = 1 ; //Mark the transaction as used
break;
}
}
if(!current)
return -1;
while(retries < MAX_RETRIES)
{
transaction[current].conn = myNdb->startTransaction();
if (transaction[current].conn == NULL) {
/**
* no transaction to close since conn == null
*/
milliSleep(10);
retries++;
continue;
}
myNdbOperation = transaction[current].conn->getNdbOperation(myTable);
if (myNdbOperation == NULL)
{
if (asynchErrorHandler(transaction[current].conn, myNdb))
{
myNdb->closeTransaction(transaction[current].conn);
transaction[current].conn = 0;
milliSleep(10);
retries++;
continue;
}
asynchExitHandler(myNdb);
} // if
if(myNdbOperation->insertTuple() < 0 ||
myNdbOperation->equal("REG_NO", data) < 0 ||
myNdbOperation->setValue("BRAND", "Mercedes") <0 ||
myNdbOperation->setValue("COLOR", "Blue") < 0)
{
if (asynchErrorHandler(transaction[current].conn, myNdb))
{
myNdb->closeTransaction(transaction[current].conn);
transaction[current].conn = 0;
retries++;
milliSleep(10);
continue;
}
asynchExitHandler(myNdb);
}
/*Prepare transaction (the transaction is NOT yet sent to NDB)*/
transaction[current].conn->executeAsynchPrepare(NdbTransaction::Commit,
&callback,
cb);
/**
* When we have prepared parallelism number of transactions ->
* send the transaction to ndb.
* Next time we will deal with the transactions are in the
* callback. There we will see which ones that were successful
* and which ones to retry.
*/
if (nPreparedTransactions == parallelism-1)
{
// send-poll all transactions
// close transaction is done in callback
myNdb->sendPollNdb(3000, parallelism );
nPreparedTransactions=0;
}
else
nPreparedTransactions++;
return 1;
}
std::cout << "Unable to recover from errors. Exiting..." << std::endl;
asynchExitHandler(myNdb);
return -1;
}