use of org.neo4j.kernel.api.exceptions.ConstraintViolationTransactionFailureException in project neo4j by neo4j.
the class KernelTransactionImplementation method commit.
private long commit() throws TransactionFailureException {
boolean success = false;
long txId = READ_ONLY;
try (CommitEvent commitEvent = transactionEvent.beginCommitEvent()) {
// Trigger transaction "before" hooks.
if (hasDataChanges()) {
try {
hooksState = hooks.beforeCommit(txState, this, storageEngine.storeReadLayer(), storageStatement);
if (hooksState != null && hooksState.failed()) {
TransactionHookException cause = hooksState.failure();
throw new TransactionFailureException(Status.Transaction.TransactionHookFailed, cause, "");
}
} finally {
beforeHookInvoked = true;
}
}
// Convert changes into commands and commit
if (hasChanges()) {
// grab all optimistic locks now, locks can't be deferred any further
statementLocks.prepareForCommit();
// use pessimistic locks for the rest of the commit process, locks can't be deferred any further
Locks.Client commitLocks = statementLocks.pessimistic();
// Gather up commands from the various sources
Collection<StorageCommand> extractedCommands = new ArrayList<>();
storageEngine.createCommands(extractedCommands, txState, storageStatement, commitLocks, lastTransactionIdWhenStarted);
if (hasLegacyIndexChanges()) {
legacyIndexTransactionState.extractCommands(extractedCommands);
}
/* Here's the deal: we track a quick-to-access hasChanges in transaction state which is true
* if there are any changes imposed by this transaction. Some changes made inside a transaction undo
* previously made changes in that same transaction, and so at some point a transaction may have
* changes and at another point, after more changes seemingly,
* the transaction may not have any changes.
* However, to track that "undoing" of the changes is a bit tedious, intrusive and hard to maintain
* and get right.... So to really make sure the transaction has changes we re-check by looking if we
* have produced any commands to add to the logical log.
*/
if (!extractedCommands.isEmpty()) {
// Finish up the whole transaction representation
PhysicalTransactionRepresentation transactionRepresentation = new PhysicalTransactionRepresentation(extractedCommands);
TransactionHeaderInformation headerInformation = headerInformationFactory.create();
long timeCommitted = clock.millis();
transactionRepresentation.setHeader(headerInformation.getAdditionalHeader(), headerInformation.getMasterId(), headerInformation.getAuthorId(), startTimeMillis, lastTransactionIdWhenStarted, timeCommitted, commitLocks.getLockSessionId());
// Commit the transaction
success = true;
TransactionToApply batch = new TransactionToApply(transactionRepresentation);
txId = transactionId = commitProcess.commit(batch, commitEvent, INTERNAL);
commitTime = timeCommitted;
}
}
success = true;
return txId;
} catch (ConstraintValidationException | CreateConstraintFailureException e) {
throw new ConstraintViolationTransactionFailureException(e.getUserMessage(new KeyReadTokenNameLookup(currentTransactionOperations.keyReadOperations())), e);
} finally {
if (!success) {
rollback();
} else {
afterCommit(txId);
}
}
}
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