public TitanProperty setProperty(TitanVertex vertex, final TitanKey key, Object value) {
Preconditions.checkNotNull(key);
Preconditions.checkArgument(
key.isUnique(Direction.OUT), "Not an out-unique key: %s", key.getName());
Lock uniqueLock = FakeLock.INSTANCE;
try {
if (config.hasVerifyUniqueness()) {
// Acquire uniqueness lock, remove and add
uniqueLock = getUniquenessLock(vertex, key, value);
uniqueLock.lock();
vertex.removeProperty(key);
} else {
// Only delete in-memory
InternalVertex v = (InternalVertex) vertex;
for (InternalRelation r :
v.it()
.getAddedRelations(
new Predicate<InternalRelation>() {
@Override
public boolean apply(@Nullable InternalRelation p) {
return p.getType().equals(key);
}
})) {
r.remove();
}
}
return addPropertyInternal(vertex, key, value);
} finally {
uniqueLock.unlock();
}
}
private void lockKeyedProperty(TitanProperty prop, StoreMutator mutator) throws StorageException {
TitanKey pt = prop.getPropertyKey();
assert pt.isSimple();
if (pt.hasIndex() && pt.isUnique()) {
if (prop.isNew()) {
mutator.acquireIndexLock(getIndexKey(prop.getAttribute()), getKeyedIndexColumn(pt), null);
} else {
assert prop.isRemoved();
mutator.acquireIndexLock(
getIndexKey(prop.getAttribute()), getKeyedIndexColumn(pt), getIndexValue(prop));
}
}
}
public TitanProperty addPropertyInternal(TitanVertex vertex, TitanKey key, Object value) {
verifyWriteAccess(vertex);
vertex = ((InternalVertex) vertex).it();
Preconditions.checkNotNull(key);
value = AttributeUtil.verifyAttribute(key, value);
Lock uniqueLock = FakeLock.INSTANCE;
if (config.hasVerifyUniqueness() && (key.isUnique(Direction.OUT) || key.isUnique(Direction.IN)))
uniqueLock = getUniquenessLock(vertex, key, value);
uniqueLock.lock();
try {
// Check uniqueness
if (config.hasVerifyUniqueness()) {
if (key.isUnique(Direction.OUT)) {
Preconditions.checkArgument(
Iterables.isEmpty(
query(vertex).includeHidden().type(key).direction(Direction.OUT).properties()),
"An property with the given key already exists on the vertex and the property key is defined as out-unique");
}
if (key.isUnique(Direction.IN)) {
Preconditions.checkArgument(
Iterables.isEmpty(getVertices(key, value)),
"The given value is already used as a property and the property key is defined as in-unique");
}
}
StandardProperty prop =
new StandardProperty(
temporaryID.decrementAndGet(),
key,
(InternalVertex) vertex,
value,
ElementLifeCycle.New);
if (config.hasAssignIDsImmediately()) graph.assignID(prop);
connectRelation(prop);
return prop;
} finally {
uniqueLock.unlock();
}
}
@Override
public long[] indexRetrieval(Object key, TitanKey pt, InternalTitanTransaction tx) {
Preconditions.checkArgument(
pt.isSimple(), "Currently, only simple properties are supported for index retrieval");
Preconditions.checkArgument(
pt.hasIndex(), "Cannot retrieve for given property key - it does not have an index");
long[] vertices = null;
Preconditions.checkArgument(
pt.getDataType().isInstance(key),
"Specified object is incompatible with property data type [" + pt.getName() + "]");
for (int readAttempt = 0; readAttempt < maxReadRetryAttempts; readAttempt++) {
try {
if (pt.isUnique()) {
ByteBuffer value =
propertyIndex.get(getIndexKey(key), getKeyedIndexColumn(pt), tx.getTxHandle());
if (value != null) {
vertices = new long[1];
vertices[0] = VariableLong.readPositive(value);
}
} else {
ByteBuffer startColumn = VariableLong.positiveByteBuffer(pt.getID());
List<Entry> entries =
propertyIndex.getSlice(
getIndexKey(key),
startColumn,
ByteBufferUtil.nextBiggerBuffer(startColumn),
tx.getTxHandle());
vertices = new long[entries.size()];
int i = 0;
for (Entry ent : entries) {
vertices[i++] = VariableLong.readPositive(ent.getValue());
}
}
break;
} catch (StorageException e) {
if (e instanceof TemporaryStorageException) {
if (readAttempt < maxReadRetryAttempts - 1) temporaryStorageException(e);
else throw readException(e, maxReadRetryAttempts);
} else throw readException(e);
}
}
if (vertices == null) return new long[0];
else return vertices;
}
private void addIndexEntry(TitanProperty prop, StoreMutator mutator) throws StorageException {
TitanKey pt = prop.getPropertyKey();
assert pt.isSimple();
if (pt.hasIndex()) {
if (pt.isUnique()) {
mutator.mutateIndex(
getIndexKey(prop.getAttribute()),
Lists.newArrayList(new Entry(getKeyedIndexColumn(pt), getIndexValue(prop))),
null);
} else {
mutator.mutateIndex(
getIndexKey(prop.getAttribute()),
Lists.newArrayList(new Entry(getIndexColumn(pt, prop.getID()), getIndexValue(prop))),
null);
}
}
}
@Override
public TitanVertex getVertex(TitanKey key, Object attribute) {
Preconditions.checkArgument(
key.isUnique(Direction.IN), "Key is not uniquely associated to value [%s]", key.getName());
return Iterables.getOnlyElement(getVertices(key, attribute), null);
}
@Override
public TitanProperty addProperty(TitanVertex vertex, TitanKey key, Object value) {
if (key.isUnique(Direction.OUT)) return setProperty(vertex, key, value);
else return addPropertyInternal(vertex, key, value);
}
private ByteBuffer getIndexColumn(TitanKey type, long propertyID) {
assert !type.isUnique();
return VariableLong.positiveByteBuffer(new long[] {type.getID(), propertyID});
}
private ByteBuffer getKeyedIndexColumn(TitanKey type) {
assert type.isUnique();
return VariableLong.positiveByteBuffer(type.getID());
}