private void writeInlineEdge(
DataOutput out, InternalRelation edge, TitanType type, boolean writeEdgeType) {
assert type.isSimple();
assert writeEdgeType
|| type.isEdgeLabel()
|| (type.isPropertyKey() && !hasGenericDataType((TitanKey) type));
if (edge == null) {
assert !writeEdgeType;
if (type.isPropertyKey()) {
out.writeObject(null);
} else {
assert type.isEdgeLabel();
VariableLong.writePositive(out, 0);
}
} else {
if (writeEdgeType) {
IDHandler.writeInlineEdgeType(out, type.getID(), idManager);
}
if (edge.isProperty()) {
Object attribute = ((TitanProperty) edge).getAttribute();
if (hasGenericDataType((TitanKey) type)) out.writeClassAndObject(attribute);
else out.writeObject(attribute);
} else {
assert edge.isUnidirected() && edge.isEdge();
VariableLong.writePositive(out, edge.getVertex(1).getID());
}
}
}
private Entry getEntry(
InternalTitanTransaction tx,
InternalRelation edge,
InternalTitanVertex perspective,
Map<TitanType, TypeSignature> signatures,
boolean columnOnly) {
TitanType et = edge.getType();
long etid = et.getID();
int dirID;
if (edge.isProperty()) {
dirID = 0;
} else if (edge.getVertex(0).equals(perspective)) {
// Out TitanRelation
assert edge.isDirected() || edge.isUnidirected();
dirID = 2;
} else {
// In TitanRelation
assert !edge.isUnidirected() && edge.getVertex(1).equals(perspective);
dirID = 3;
}
int etIDLength = IDHandler.edgeTypeLength(etid, idManager);
ByteBuffer column = null, value = null;
if (et.isSimple()) {
if (et.isFunctional()) {
column = ByteBuffer.allocate(etIDLength);
IDHandler.writeEdgeType(column, etid, dirID, idManager);
} else {
column = ByteBuffer.allocate(etIDLength + VariableLong.positiveLength(edge.getID()));
IDHandler.writeEdgeType(column, etid, dirID, idManager);
VariableLong.writePositive(column, edge.getID());
}
column.flip();
if (!columnOnly) {
if (edge.isEdge()) {
long nodeIDDiff =
((TitanEdge) edge).getOtherVertex(perspective).getID() - perspective.getID();
int nodeIDDiffLength = VariableLong.length(nodeIDDiff);
if (et.isFunctional()) {
value =
ByteBuffer.allocate(nodeIDDiffLength + VariableLong.positiveLength(edge.getID()));
VariableLong.write(value, nodeIDDiff);
VariableLong.writePositive(value, edge.getID());
} else {
value = ByteBuffer.allocate(nodeIDDiffLength);
VariableLong.write(value, nodeIDDiff);
}
value.flip();
} else {
assert edge.isProperty();
DataOutput out = serializer.getDataOutput(defaultOutputCapacity, true);
// Write object
writeAttribute(out, (TitanProperty) edge);
if (et.isFunctional()) {
VariableLong.writePositive(out, edge.getID());
}
value = out.getByteBuffer();
}
}
} else {
TypeSignature ets = getSignature(tx, et, signatures);
InternalRelation[] keys = new InternalRelation[ets.keyLength()],
values = new InternalRelation[ets.valueLength()];
List<InternalRelation> rest = new ArrayList<InternalRelation>();
ets.sort(edge.getRelations(SimpleAtomicQuery.queryAll(edge), false), keys, values, rest);
DataOutput out = serializer.getDataOutput(defaultOutputCapacity, true);
IDHandler.writeEdgeType(out, etid, dirID, idManager);
for (int i = 0; i < keys.length; i++) writeInlineEdge(out, keys[i], ets.getKeyType(i));
if (!et.isFunctional()) {
VariableLong.writePositive(out, edge.getID());
}
column = out.getByteBuffer();
if (!columnOnly) {
out = serializer.getDataOutput(defaultOutputCapacity, true);
if (edge.isEdge()) {
long nodeIDDiff =
((TitanEdge) edge).getOtherVertex(perspective).getID() - perspective.getID();
VariableLong.write(out, nodeIDDiff);
} else {
assert edge.isProperty();
writeAttribute(out, (TitanProperty) edge);
}
if (et.isFunctional()) {
assert edge.isEdge();
VariableLong.writePositive(out, edge.getID());
}
for (int i = 0; i < values.length; i++)
writeInlineEdge(out, values[i], ets.getValueType(i));
for (InternalRelation v : rest) writeInlineEdge(out, v);
value = out.getByteBuffer();
}
}
return new Entry(column, value);
}
@Override
public void save(
final Collection<InternalRelation> addedRelations,
final Collection<InternalRelation> deletedRelations,
final InternalTitanTransaction tx)
throws StorageException {
// Setup
log.debug(
"Saving transaction. Added {}, removed {}", addedRelations.size(), deletedRelations.size());
final Map<TitanType, TypeSignature> signatures = new HashMap<TitanType, TypeSignature>();
final TransactionHandle txh = tx.getTxHandle();
final StoreMutator mutator = getStoreMutator(txh);
final boolean acquireLocks = tx.getTxConfiguration().hasAcquireLocks();
// 1. Assign TitanVertex IDs
assignIDs(addedRelations, tx);
for (int saveAttempt = 0; saveAttempt < maxWriteRetryAttempts; saveAttempt++) {
// while (true) { //Indefinite loop, broken if no exception occurs, otherwise retried
// or failed immediately
try {
// 2. Collect deleted edges
ListMultimap<InternalTitanVertex, InternalRelation> mutations = ArrayListMultimap.create();
if (deletedRelations != null && !deletedRelations.isEmpty()) {
for (InternalRelation del : deletedRelations) {
assert del.isRemoved();
for (int pos = 0; pos < del.getArity(); pos++) {
InternalTitanVertex node = del.getVertex(pos);
if (pos == 0 || !del.isUnidirected()) {
mutations.put(node, del);
}
if (pos == 0
&& acquireLocks
&& del.getType().isFunctional()
&& ((InternalTitanType) del.getType()).isFunctionalLocking()) {
Entry entry = getEntry(tx, del, node, signatures);
mutator.acquireEdgeLock(
IDHandler.getKey(node.getID()), entry.getColumn(), entry.getValue());
}
}
if (acquireLocks && del.isProperty()) {
lockKeyedProperty((TitanProperty) del, mutator);
}
}
}
ListMultimap<InternalTitanType, InternalRelation> simpleEdgeTypes = null;
ListMultimap<InternalTitanType, InternalRelation> otherEdgeTypes = null;
// 3. Sort Added Edges
for (InternalRelation edge : addedRelations) {
if (edge.isRemoved()) continue;
assert edge.isNew();
TitanType et = edge.getType();
// Give special treatment to edge type definitions
if (SystemTypeManager.prepersistedSystemTypes.contains(et)) {
assert edge.getVertex(0) instanceof InternalTitanType;
InternalTitanType node = (InternalTitanType) edge.getVertex(0);
assert node.hasID();
if (node.isSimple()) {
if (simpleEdgeTypes == null) simpleEdgeTypes = ArrayListMultimap.create();
simpleEdgeTypes.put(node, edge);
} else {
if (otherEdgeTypes == null) otherEdgeTypes = ArrayListMultimap.create();
otherEdgeTypes.put(node, edge);
}
} else { // STANDARD TitanRelation
assert (edge.getArity() == 1 && edge.isProperty())
|| (edge.getArity() == 2 && edge.isEdge());
for (int pos = 0; pos < edge.getArity(); pos++) {
InternalTitanVertex node = edge.getVertex(pos);
assert node.hasID();
if (pos == 0 || !edge.isUnidirected()) {
mutations.put(node, edge);
}
if (pos == 0
&& acquireLocks
&& edge.getType().isFunctional()
&& !node.isNew()
&& ((InternalTitanType) edge.getType()).isFunctionalLocking()) {
Entry entry = getEntry(tx, edge, node, signatures, true);
mutator.acquireEdgeLock(IDHandler.getKey(node.getID()), entry.getColumn(), null);
}
}
}
if (acquireLocks && edge.isProperty()) {
lockKeyedProperty((TitanProperty) edge, mutator);
}
}
// 3. Persist
if (simpleEdgeTypes != null) persist(simpleEdgeTypes, signatures, tx, mutator);
if (otherEdgeTypes != null) persist(otherEdgeTypes, signatures, tx, mutator);
mutator.flush();
// Commit saved EdgeTypes to TypeManager
if (simpleEdgeTypes != null) commitEdgeTypes(simpleEdgeTypes.keySet());
if (otherEdgeTypes != null) commitEdgeTypes(otherEdgeTypes.keySet());
if (!mutations.isEmpty()) persist(mutations, signatures, tx, mutator);
mutator.flush();
// Successfully completed - return to break out of loop
break;
} catch (Throwable e) {
if (e instanceof TemporaryStorageException) {
if (saveAttempt < maxWriteRetryAttempts - 1) temporaryStorageException(e);
else
throw new PermanentStorageException(
"Tried committing "
+ maxWriteRetryAttempts
+ " times on temporary exception without success",
e);
} else if (e instanceof StorageException) {
throw (StorageException) e;
} else {
throw new PermanentStorageException(
"Unidentified exception occurred during persistence", e);
}
}
}
}