/**
* @param \Tripod\ChangeSet $cs Change-set to apply
* @param string $contextAlias
* @throws \Tripod\Exceptions\Exception
* @return array An array of subjects and predicates that have been changed
*/
protected function storeChanges(\Tripod\ChangeSet $cs, $contextAlias)
{
$t = new \Tripod\Timer();
$t->start();
$subjectsOfChange = $cs->get_subjects_of_change();
$transaction_id = $this->generateTransactionId();
// store the details of the transaction in the transaction log
$mongoGraph = new MongoGraph();
$mongoGraph->_index = $cs->_index;
$csDoc = $mongoGraph->to_tripod_view_array("changes", $contextAlias);
// todo - this changed to tripod view array, why is "changes" the docId?
$originalCBDs = array();
// apply the changes
try {
// 1. lock all documents
// 2. create new transaction
// 3. apply changes
// 4. unlock all documents
// 5. complete transaction
$originalCBDs = $this->lockAllDocuments($subjectsOfChange, $transaction_id, $contextAlias);
$this->getTransactionLog()->createNewTransaction($transaction_id, $csDoc['value'][_GRAPHS], $originalCBDs, $this->getStoreName(), $this->getPodName());
if (empty($originalCBDs)) {
$this->getTransactionLog()->failTransaction($transaction_id, new \Exception('Did not obtain locks on documents'));
throw new \Exception('Did not obtain locks on documents');
}
$changes = $this->applyChangeSet($cs, $originalCBDs, $contextAlias, $transaction_id);
$this->debugLog(MONGO_LOCK, array('description' => 'Driver::storeChanges - Unlocking documents, apply change-set completed', 'transaction_id' => $transaction_id));
$this->unlockAllDocuments($transaction_id);
$this->getTransactionLog()->completeTransaction($transaction_id, $changes['newCBDs']);
$t->stop();
$this->timingLog(MONGO_WRITE, array('duration' => $t->result(), 'subjectsOfChange' => implode(", ", $subjectsOfChange)));
$this->getStat()->timer(MONGO_WRITE . ".{$this->getPodName()}", $t->result());
return $changes;
} catch (\Exception $e) {
$this->getStat()->increment(MONGO_ROLLBACK);
$this->errorLog(MONGO_ROLLBACK, array('description' => 'Save Failed Rolling back transaction:' . $e->getMessage(), 'transaction_id' => $transaction_id, 'subjectsOfChange' => implode(",", $subjectsOfChange), 'mongoDriverError' => $this->getLastDBError($this->getDatabase()), 'exceptionMessage' => $e->getMessage()));
$this->rollbackTransaction($transaction_id, $originalCBDs, $e);
throw new \Tripod\Exceptions\Exception('Error storing changes: ' . $e->getMessage() . " >>>" . $e->getTraceAsString());
}
}
