private Lock getUniquenessLock(final TitanVertex start, final TitanType type, final Object end) {
if (config.isSingleThreaded()) return FakeLock.INSTANCE;
if (uniqueLocks == UNINITIALIZED_LOCKS) {
Preconditions.checkArgument(!config.isSingleThreaded());
synchronized (this) {
if (uniqueLocks == UNINITIALIZED_LOCKS)
uniqueLocks = new ConcurrentHashMap<UniqueLockApplication, Lock>();
}
}
UniqueLockApplication la = new UniqueLockApplication(start, type, end);
Lock lock = new ReentrantLock();
Lock existingLock = uniqueLocks.putIfAbsent(la, lock);
if (existingLock == null) return lock;
else return existingLock;
}
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();
}
}
public void removeRelation(InternalRelation relation) {
Preconditions.checkArgument(!relation.isRemoved());
relation = relation.it();
// Delete from Vertex
for (int i = 0; i < relation.getLen(); i++) {
relation.getVertex(i).removeRelation(relation);
}
// Update transaction data structures
if (relation.isNew()) {
addedRelations.remove(relation);
if (isVertexIndexProperty(relation)) newVertexIndexEntries.remove((TitanProperty) relation);
} else {
Preconditions.checkArgument(relation.isLoaded());
if (deletedRelations == EMPTY_DELETED_RELATIONS) {
if (config.isSingleThreaded()) {
deletedRelations = new HashMap<Long, InternalRelation>();
} else {
synchronized (this) {
if (deletedRelations == EMPTY_DELETED_RELATIONS)
deletedRelations = new ConcurrentHashMap<Long, InternalRelation>();
}
}
}
deletedRelations.put(Long.valueOf(relation.getID()), relation);
}
}
public StandardTitanTx getNextTx() {
Preconditions.checkArgument(isClosed());
if (!config.isThreadBound())
throw new IllegalStateException(
"Cannot access element because its enclosing transaction is closed and unbound");
else return (StandardTitanTx) graph.getCurrentThreadTx();
}
@Override
public TitanEdge addEdge(TitanVertex outVertex, TitanVertex inVertex, TitanLabel label) {
verifyWriteAccess(outVertex, inVertex);
outVertex = ((InternalVertex) outVertex).it();
inVertex = ((InternalVertex) inVertex).it();
Preconditions.checkNotNull(label);
Lock uniqueLock = FakeLock.INSTANCE;
if (config.hasVerifyUniqueness()
&& (label.isUnique(Direction.OUT) || label.isUnique(Direction.IN)))
uniqueLock = getUniquenessLock(outVertex, label, inVertex);
uniqueLock.lock();
try {
// Check uniqueness
if (config.hasVerifyUniqueness()) {
if (label.isUnique(Direction.OUT)) {
Preconditions.checkArgument(
Iterables.isEmpty(
query(outVertex)
.includeHidden()
.type(label)
.direction(Direction.OUT)
.titanEdges()),
"An edge with the given type already exists on the out-vertex");
}
if (label.isUnique(Direction.IN)) {
Preconditions.checkArgument(
Iterables.isEmpty(
query(inVertex).includeHidden().type(label).direction(Direction.IN).titanEdges()),
"An edge with the given type already exists on the in-vertex");
}
}
StandardEdge edge =
new StandardEdge(
temporaryID.decrementAndGet(),
label,
(InternalVertex) outVertex,
(InternalVertex) inVertex,
ElementLifeCycle.New);
if (config.hasAssignIDsImmediately()) graph.assignID(edge);
connectRelation(edge);
return edge;
} finally {
uniqueLock.unlock();
}
}
@Override
public TitanLabel getEdgeLabel(String name) {
TitanType et = getType(name);
if (et == null) {
return config.getAutoEdgeTypeMaker().makeLabel(name, makeType());
} else if (et.isEdgeLabel()) {
return (TitanLabel) et;
} else throw new IllegalArgumentException("The type of given name is not a label: " + name);
}
@Override
public TitanKey getPropertyKey(String name) {
TitanType et = getType(name);
if (et == null) {
return config.getAutoEdgeTypeMaker().makeKey(name, makeType());
} else if (et.isPropertyKey()) {
return (TitanKey) et;
} else throw new IllegalArgumentException("The type of given name is not a key: " + name);
}
public StandardTitanTx(
StandardTitanGraph graph, TransactionConfig config, BackendTransaction txHandle) {
Preconditions.checkNotNull(graph);
Preconditions.checkArgument(graph.isOpen());
Preconditions.checkNotNull(config);
Preconditions.checkNotNull(txHandle);
this.graph = graph;
this.config = config;
this.idInspector = graph.getIDInspector();
this.txHandle = txHandle;
temporaryID = new AtomicLong(-1);
Cache<StandardElementQuery, List<Object>> indexCacheBuilder =
CacheBuilder.newBuilder()
.weigher(
new Weigher<StandardElementQuery, List<Object>>() {
@Override
public int weigh(StandardElementQuery q, List<Object> r) {
return 2 + r.size();
}
})
.maximumWeight(DEFAULT_CACHE_SIZE)
.build();
int concurrencyLevel;
if (config.isSingleThreaded()) {
vertexCache = new SimpleVertexCache();
addedRelations = new SimpleBufferAddedRelations();
concurrencyLevel = 1;
typeCache = new HashMap<String, TitanType>();
newVertexIndexEntries = new SimpleIndexCache();
} else {
vertexCache = new ConcurrentVertexCache();
addedRelations = new ConcurrentBufferAddedRelations();
concurrencyLevel = 4;
typeCache = new ConcurrentHashMap<String, TitanType>();
newVertexIndexEntries = new ConcurrentIndexCache();
}
for (SystemType st : SystemKey.values()) typeCache.put(st.getName(), st);
indexCache =
CacheBuilder.newBuilder()
.weigher(
new Weigher<StandardElementQuery, List<Object>>() {
@Override
public int weigh(StandardElementQuery q, List<Object> r) {
return 2 + r.size();
}
})
.concurrencyLevel(concurrencyLevel)
.maximumWeight(DEFAULT_CACHE_SIZE)
.build();
uniqueLocks = UNINITIALIZED_LOCKS;
deletedRelations = EMPTY_DELETED_RELATIONS;
this.isOpen = true;
}
@Override
public TitanVertex addVertex() {
verifyWriteAccess();
StandardVertex vertex =
new StandardVertex(this, temporaryID.decrementAndGet(), ElementLifeCycle.New);
vertex.addProperty(SystemKey.VertexState, (byte) 0);
if (config.hasAssignIDsImmediately()) graph.assignID(vertex);
vertexCache.add(vertex, vertex.getID());
return vertex;
}
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 TitanVertex getVertex(final long id) {
verifyOpen();
if (config.hasVerifyVertexExistence() && !containsVertex(id)) return null;
return getExistingVertex(id);
}
private final void verifyWriteAccess(TitanVertex... vertices) {
if (config.isReadOnly())
throw new UnsupportedOperationException(
"Cannot create new entities in read-only transaction");
verifyAccess(vertices);
}
