/**
* Adds a new trait to an existing entity represented by a guid.
*
* @param guid globally unique identifier for the entity
* @param traitInstance trait instance that needs to be added to entity
* @throws RepositoryException
*/
@Override
@GraphTransaction
public void addTrait(String guid, ITypedStruct traitInstance) throws RepositoryException {
Preconditions.checkNotNull(traitInstance, "Trait instance cannot be null");
final String traitName = traitInstance.getTypeName();
LOG.debug("Adding a new trait={} for entity={}", traitName, guid);
try {
Vertex instanceVertex = graphHelper.getVertexForGUID(guid);
// add the trait instance as a new vertex
final String typeName = GraphHelper.getTypeName(instanceVertex);
TypedInstanceToGraphMapper instanceToGraphMapper =
new TypedInstanceToGraphMapper(graphToInstanceMapper, deleteHandler);
instanceToGraphMapper.mapTraitInstanceToVertex(
traitInstance, typeSystem.getDataType(ClassType.class, typeName), instanceVertex);
// update the traits in entity once adding trait instance is successful
GraphHelper.addProperty(instanceVertex, Constants.TRAIT_NAMES_PROPERTY_KEY, traitName);
GraphHelper.setProperty(
instanceVertex,
Constants.MODIFICATION_TIMESTAMP_PROPERTY_KEY,
RequestContext.get().getRequestTime());
} catch (RepositoryException e) {
throw e;
} catch (Exception e) {
throw new RepositoryException(e);
}
}
/**
* Deletes the specified entity vertices. Deletes any traits, composite entities, and structs
* owned by each entity. Also deletes all the references from/to the entity.
*
* @param instanceVertices
* @throws AtlasException
*/
public void deleteEntities(List<AtlasVertex> instanceVertices) throws AtlasException {
RequestContext requestContext = RequestContext.get();
Set<AtlasVertex> deletionCandidateVertices = new HashSet<>();
for (AtlasVertex instanceVertex : instanceVertices) {
String guid = GraphHelper.getIdFromVertex(instanceVertex);
Id.EntityState state = GraphHelper.getState(instanceVertex);
if (requestContext.getDeletedEntityIds().contains(guid) || state == Id.EntityState.DELETED) {
LOG.debug("Skipping deletion of {} as it is already deleted", guid);
continue;
}
// Get GUIDs and vertices for all deletion candidates.
Set<VertexInfo> compositeVertices = graphHelper.getCompositeVertices(instanceVertex);
// Record all deletion candidate GUIDs in RequestContext
// and gather deletion candidate vertices.
for (VertexInfo vertexInfo : compositeVertices) {
requestContext.recordEntityDelete(vertexInfo.getGuid(), vertexInfo.getTypeName());
deletionCandidateVertices.add(vertexInfo.getVertex());
}
}
// Delete traits and vertices.
for (AtlasVertex deletionCandidateVertex : deletionCandidateVertices) {
deleteAllTraits(deletionCandidateVertex);
deleteTypeVertex(deletionCandidateVertex, false);
}
}
/**
* Gets the list of trait names for a given entity represented by a guid.
*
* @param guid globally unique identifier for the entity
* @return a list of trait names for the given entity guid
* @throws RepositoryException
*/
@Override
@GraphTransaction
public List<String> getTraitNames(String guid) throws AtlasException {
LOG.debug("Retrieving trait names for entity={}", guid);
Vertex instanceVertex = graphHelper.getVertexForGUID(guid);
return GraphHelper.getTraitNames(instanceVertex);
}
/**
* Deletes a given trait from an existing entity represented by a guid.
*
* @param guid globally unique identifier for the entity
* @param traitNameToBeDeleted name of the trait
* @throws RepositoryException
*/
@Override
@GraphTransaction
public void deleteTrait(String guid, String traitNameToBeDeleted)
throws TraitNotFoundException, EntityNotFoundException, RepositoryException {
LOG.debug("Deleting trait={} from entity={}", traitNameToBeDeleted, guid);
Vertex instanceVertex = graphHelper.getVertexForGUID(guid);
List<String> traitNames = GraphHelper.getTraitNames(instanceVertex);
if (!traitNames.contains(traitNameToBeDeleted)) {
throw new TraitNotFoundException(
"Could not find trait="
+ traitNameToBeDeleted
+ " in the repository for entity: "
+ guid);
}
try {
final String entityTypeName = GraphHelper.getTypeName(instanceVertex);
String relationshipLabel = GraphHelper.getTraitLabel(entityTypeName, traitNameToBeDeleted);
Edge edge = GraphHelper.getEdgeForLabel(instanceVertex, relationshipLabel);
deleteHandler.deleteEdgeReference(edge, DataTypes.TypeCategory.TRAIT, false, true);
// update the traits in entity once trait removal is successful
traitNames.remove(traitNameToBeDeleted);
updateTraits(instanceVertex, traitNames);
} catch (Exception e) {
throw new RepositoryException(e);
}
}
private void dumpGraph() {
AtlasGraph<?, ?> graph = TestUtils.getGraph();
for (AtlasVertex<?, ?> v : graph.getVertices()) {
System.out.println("****v = " + GraphHelper.vertexString(v));
for (AtlasEdge<?, ?> e : v.getEdges(AtlasEdgeDirection.OUT)) {
System.out.println("****e = " + GraphHelper.edgeString(e));
}
}
}
/**
* Delete all traits from the specified vertex.
*
* @param instanceVertex
* @throws AtlasException
*/
private void deleteAllTraits(Vertex instanceVertex) throws AtlasException {
List<String> traitNames = GraphHelper.getTraitNames(instanceVertex);
LOG.debug("Deleting traits {} for {}", traitNames, string(instanceVertex));
String typeName = GraphHelper.getTypeName(instanceVertex);
for (String traitNameToBeDeleted : traitNames) {
String relationshipLabel = GraphHelper.getTraitLabel(typeName, traitNameToBeDeleted);
deleteEdgeReference(instanceVertex, relationshipLabel, DataTypes.TypeCategory.TRAIT, false);
}
}
private void updateTraits(Vertex instanceVertex, List<String> traitNames) {
// remove the key
instanceVertex.removeProperty(Constants.TRAIT_NAMES_PROPERTY_KEY);
// add it back again
for (String traitName : traitNames) {
GraphHelper.addProperty(instanceVertex, Constants.TRAIT_NAMES_PROPERTY_KEY, traitName);
}
GraphHelper.setProperty(
instanceVertex,
Constants.MODIFICATION_TIMESTAMP_PROPERTY_KEY,
RequestContext.get().getRequestTime());
}
/**
* Deletes the entity vertex - deletes the traits and all the references
*
* @param instanceVertex
* @throws AtlasException
*/
public void deleteEntity(Vertex instanceVertex) throws AtlasException {
RequestContext requestContext = RequestContext.get();
String guid = GraphHelper.getIdFromVertex(instanceVertex);
Id.EntityState state = GraphHelper.getState(instanceVertex);
if (requestContext.getDeletedEntityIds().contains(guid) || state == Id.EntityState.DELETED) {
LOG.debug("Skipping deleting {} as its already deleted", guid);
return;
}
String typeName = GraphHelper.getTypeName(instanceVertex);
requestContext.recordEntityDelete(guid, typeName);
deleteAllTraits(instanceVertex);
deleteTypeVertex(instanceVertex, false);
}
@Override
@GraphTransaction
public AtlasClient.EntityResult deleteEntities(List<String> guids) throws RepositoryException {
if (guids == null || guids.size() == 0) {
throw new IllegalArgumentException("guids must be non-null and non-empty");
}
for (String guid : guids) {
if (guid == null) {
LOG.warn("deleteEntities: Ignoring null guid");
continue;
}
try {
Vertex instanceVertex = graphHelper.getVertexForGUID(guid);
deleteHandler.deleteEntity(instanceVertex);
} catch (EntityNotFoundException e) {
// Entity does not exist - treat as non-error, since the caller
// wanted to delete the entity and it's already gone.
LOG.info("Deletion request ignored for non-existent entity with guid " + guid);
continue;
} catch (AtlasException e) {
throw new RepositoryException(e);
}
}
RequestContext requestContext = RequestContext.get();
return new AtlasClient.EntityResult(
requestContext.getCreatedEntityIds(),
requestContext.getUpdatedEntityIds(),
requestContext.getDeletedEntityIds());
}
@Override
public String getFieldNameInVertex(IDataType<?> dataType, AttributeInfo aInfo)
throws AtlasException {
if (aInfo.name.startsWith(Constants.INTERNAL_PROPERTY_KEY_PREFIX)) {
return aInfo.name;
}
return GraphHelper.getQualifiedFieldName(dataType, aInfo.name);
}
public void deleteEdgeReference(
Vertex outVertex, String edgeLabel, DataTypes.TypeCategory typeCategory, boolean isComposite)
throws AtlasException {
Edge edge = GraphHelper.getEdgeForLabel(outVertex, edgeLabel);
if (edge != null) {
deleteEdgeReference(edge, typeCategory, isComposite, false);
}
}
private int countOutgoingEdges(AtlasVertex typeVertex, String edgeLabel) {
Iterator<AtlasEdge> outGoingEdgesByLabel =
GraphHelper.getInstance().getOutGoingEdgesByLabel(typeVertex, edgeLabel);
int edgeCount = 0;
for (Iterator<AtlasEdge> iterator = outGoingEdgesByLabel; iterator.hasNext(); ) {
iterator.next();
edgeCount++;
}
return edgeCount;
}
@Override
@GraphTransaction
public ITypedReferenceableInstance getEntityDefinition(String guid)
throws RepositoryException, EntityNotFoundException {
LOG.debug("Retrieving entity with guid={}", guid);
Vertex instanceVertex = graphHelper.getVertexForGUID(guid);
try {
return graphToInstanceMapper.mapGraphToTypedInstance(guid, instanceVertex);
} catch (AtlasException e) {
throw new RepositoryException(e);
}
}
protected void deleteVertex(AtlasVertex instanceVertex, boolean force) throws AtlasException {
// Update external references(incoming edges) to this vertex
LOG.debug(
"Setting the external references to {} to null(removing edges)", string(instanceVertex));
Iterator<AtlasEdge> edges = instanceVertex.getEdges(AtlasEdgeDirection.IN).iterator();
while (edges.hasNext()) {
AtlasEdge edge = edges.next();
Id.EntityState edgeState = GraphHelper.getState(edge);
if (edgeState == Id.EntityState.ACTIVE) {
// Delete only the active edge references
AttributeInfo attribute = getAttributeForEdge(edge.getLabel());
// TODO use delete edge instead??
deleteEdgeBetweenVertices(edge.getOutVertex(), edge.getInVertex(), attribute.name);
}
}
_deleteVertex(instanceVertex, force);
}
@Override
@GraphTransaction
public ITypedReferenceableInstance getEntityDefinition(
String entityType, String attribute, Object value) throws AtlasException {
LOG.debug("Retrieving entity with type={} and {}={}", entityType, attribute, value);
IDataType type = typeSystem.getDataType(IDataType.class, entityType);
String propertyKey = getFieldNameInVertex(type, attribute);
Vertex instanceVertex =
graphHelper.findVertex(
propertyKey,
value,
Constants.ENTITY_TYPE_PROPERTY_KEY,
entityType,
Constants.STATE_PROPERTY_KEY,
Id.EntityState.ACTIVE.name());
String guid = instanceVertex.getProperty(Constants.GUID_PROPERTY_KEY);
return graphToInstanceMapper.mapGraphToTypedInstance(guid, instanceVertex);
}
public abstract class DeleteHandler {
public static final Logger LOG = LoggerFactory.getLogger(DeleteHandler.class);
protected static final GraphHelper graphHelper = GraphHelper.getInstance();
protected TypeSystem typeSystem;
private boolean shouldUpdateReverseAttribute;
private boolean softDelete;
public DeleteHandler(
TypeSystem typeSystem, boolean shouldUpdateReverseAttribute, boolean softDelete) {
this.typeSystem = typeSystem;
this.shouldUpdateReverseAttribute = shouldUpdateReverseAttribute;
this.softDelete = softDelete;
}
/**
* Deletes the entity vertex - deletes the traits and all the references
*
* @param instanceVertex
* @throws AtlasException
*/
public void deleteEntity(Vertex instanceVertex) throws AtlasException {
RequestContext requestContext = RequestContext.get();
String guid = GraphHelper.getIdFromVertex(instanceVertex);
Id.EntityState state = GraphHelper.getState(instanceVertex);
if (requestContext.getDeletedEntityIds().contains(guid) || state == Id.EntityState.DELETED) {
LOG.debug("Skipping deleting {} as its already deleted", guid);
return;
}
String typeName = GraphHelper.getTypeName(instanceVertex);
requestContext.recordEntityDelete(guid, typeName);
deleteAllTraits(instanceVertex);
deleteTypeVertex(instanceVertex, false);
}
protected abstract void deleteEdge(Edge edge, boolean force) throws AtlasException;
/**
* Deletes a type vertex - can be entity(class type) or just vertex(struct/trait type)
*
* @param instanceVertex
* @param typeCategory
* @throws AtlasException
*/
protected void deleteTypeVertex(
Vertex instanceVertex, DataTypes.TypeCategory typeCategory, boolean force)
throws AtlasException {
switch (typeCategory) {
case STRUCT:
case TRAIT:
deleteTypeVertex(instanceVertex, force);
break;
case CLASS:
deleteEntity(instanceVertex);
break;
default:
throw new IllegalStateException("Type category " + typeCategory + " not handled");
}
}
/**
* Deleting any type vertex. Goes over the complex attributes and removes the references
*
* @param instanceVertex
* @throws AtlasException
*/
protected void deleteTypeVertex(Vertex instanceVertex, boolean force) throws AtlasException {
LOG.debug("Deleting {}", string(instanceVertex));
String typeName = GraphHelper.getTypeName(instanceVertex);
IDataType type = typeSystem.getDataType(IDataType.class, typeName);
FieldMapping fieldMapping = getFieldMapping(type);
for (AttributeInfo attributeInfo : fieldMapping.fields.values()) {
LOG.debug("Deleting attribute {} for {}", attributeInfo.name, string(instanceVertex));
String edgeLabel = GraphHelper.getEdgeLabel(type, attributeInfo);
switch (attributeInfo.dataType().getTypeCategory()) {
case CLASS:
// If its class attribute, delete the reference
deleteEdgeReference(
instanceVertex, edgeLabel, DataTypes.TypeCategory.CLASS, attributeInfo.isComposite);
break;
case STRUCT:
// If its struct attribute, delete the reference
deleteEdgeReference(instanceVertex, edgeLabel, DataTypes.TypeCategory.STRUCT, false);
break;
case ARRAY:
// For array attribute, if the element is struct/class, delete all the references
IDataType elementType = ((DataTypes.ArrayType) attributeInfo.dataType()).getElemType();
DataTypes.TypeCategory elementTypeCategory = elementType.getTypeCategory();
if (elementTypeCategory == DataTypes.TypeCategory.STRUCT
|| elementTypeCategory == DataTypes.TypeCategory.CLASS) {
Iterator<Edge> edges = GraphHelper.getOutGoingEdgesByLabel(instanceVertex, edgeLabel);
if (edges != null) {
while (edges.hasNext()) {
Edge edge = edges.next();
deleteEdgeReference(
edge, elementType.getTypeCategory(), attributeInfo.isComposite, false);
}
}
}
break;
case MAP:
// For map attribute, if the value type is struct/class, delete all the references
DataTypes.MapType mapType = (DataTypes.MapType) attributeInfo.dataType();
DataTypes.TypeCategory valueTypeCategory = mapType.getValueType().getTypeCategory();
String propertyName = GraphHelper.getQualifiedFieldName(type, attributeInfo.name);
if (valueTypeCategory == DataTypes.TypeCategory.STRUCT
|| valueTypeCategory == DataTypes.TypeCategory.CLASS) {
List<String> keys = instanceVertex.getProperty(propertyName);
if (keys != null) {
for (String key : keys) {
String mapEdgeLabel = GraphHelper.getQualifiedNameForMapKey(edgeLabel, key);
deleteEdgeReference(
instanceVertex, mapEdgeLabel, valueTypeCategory, attributeInfo.isComposite);
}
}
}
}
}
deleteVertex(instanceVertex, force);
}
/**
* Force delete is used to remove struct/trait in case of entity updates
*
* @param edge
* @param typeCategory
* @param isComposite
* @param forceDeleteStructTrait
* @return returns true if the edge reference is hard deleted
* @throws AtlasException
*/
public boolean deleteEdgeReference(
Edge edge,
DataTypes.TypeCategory typeCategory,
boolean isComposite,
boolean forceDeleteStructTrait)
throws AtlasException {
LOG.debug("Deleting {}", string(edge));
boolean forceDelete =
(typeCategory == DataTypes.TypeCategory.STRUCT
|| typeCategory == DataTypes.TypeCategory.TRAIT)
? forceDeleteStructTrait
: false;
if (typeCategory == DataTypes.TypeCategory.STRUCT
|| typeCategory == DataTypes.TypeCategory.TRAIT
|| (typeCategory == DataTypes.TypeCategory.CLASS && isComposite)) {
// If the vertex is of type struct/trait, delete the edge and then the reference vertex as the
// vertex is not shared by any other entities.
// If the vertex is of type class, and its composite attribute, this reference vertex'
// lifecycle is controlled
// through this delete, hence delete the edge and the reference vertex.
Vertex vertexForDelete = edge.getVertex(Direction.IN);
// If deleting the edge and then the in vertex, reverse attribute shouldn't be updated
deleteEdge(edge, false, forceDelete);
deleteTypeVertex(vertexForDelete, typeCategory, forceDelete);
} else {
// If the vertex is of type class, and its not a composite attributes, the reference vertex'
// lifecycle is not controlled
// through this delete. Hence just remove the reference edge. Leave the reference vertex as is
// If deleting just the edge, reverse attribute should be updated for any references
// For example, for the department type system, if the person's manager edge is deleted,
// subordinates of manager should be updated
deleteEdge(edge, true, false);
}
return !softDelete || forceDelete;
}
public void deleteEdgeReference(
Vertex outVertex, String edgeLabel, DataTypes.TypeCategory typeCategory, boolean isComposite)
throws AtlasException {
Edge edge = GraphHelper.getEdgeForLabel(outVertex, edgeLabel);
if (edge != null) {
deleteEdgeReference(edge, typeCategory, isComposite, false);
}
}
protected void deleteEdge(Edge edge, boolean updateReverseAttribute, boolean force)
throws AtlasException {
// update reverse attribute
if (updateReverseAttribute) {
AttributeInfo attributeInfo = getAttributeForEdge(edge.getLabel());
if (attributeInfo.reverseAttributeName != null) {
deleteEdgeBetweenVertices(
edge.getVertex(Direction.IN),
edge.getVertex(Direction.OUT),
attributeInfo.reverseAttributeName);
}
}
deleteEdge(edge, force);
}
protected void deleteVertex(Vertex instanceVertex, boolean force) throws AtlasException {
// Update external references(incoming edges) to this vertex
LOG.debug(
"Setting the external references to {} to null(removing edges)", string(instanceVertex));
Iterator<Edge> edges = instanceVertex.getEdges(Direction.IN).iterator();
while (edges.hasNext()) {
Edge edge = edges.next();
Id.EntityState edgeState = GraphHelper.getState(edge);
if (edgeState == Id.EntityState.ACTIVE) {
// Delete only the active edge references
AttributeInfo attribute = getAttributeForEdge(edge.getLabel());
// TODO use delete edge instead??
deleteEdgeBetweenVertices(
edge.getVertex(Direction.OUT), edge.getVertex(Direction.IN), attribute.name);
}
}
_deleteVertex(instanceVertex, force);
}
protected abstract void _deleteVertex(Vertex instanceVertex, boolean force);
/**
* Deletes the edge between outvertex and inVertex. The edge is for attribute attributeName of
* outVertex
*
* @param outVertex
* @param inVertex
* @param attributeName
* @throws AtlasException
*/
protected void deleteEdgeBetweenVertices(Vertex outVertex, Vertex inVertex, String attributeName)
throws AtlasException {
LOG.debug(
"Removing edge from {} to {} with attribute name {}",
string(outVertex),
string(inVertex),
attributeName);
String typeName = GraphHelper.getTypeName(outVertex);
String outId = GraphHelper.getIdFromVertex(outVertex);
Id.EntityState state = GraphHelper.getState(outVertex);
if ((outId != null && RequestContext.get().isDeletedEntity(outId))
|| state == Id.EntityState.DELETED) {
// If the reference vertex is marked for deletion, skip updating the reference
return;
}
IDataType type = typeSystem.getDataType(IDataType.class, typeName);
AttributeInfo attributeInfo = getFieldMapping(type).fields.get(attributeName);
String propertyName = GraphHelper.getQualifiedFieldName(type, attributeName);
String edgeLabel = EDGE_LABEL_PREFIX + propertyName;
Edge edge = null;
switch (attributeInfo.dataType().getTypeCategory()) {
case CLASS:
// If its class attribute, its the only edge between two vertices
if (attributeInfo.multiplicity.nullAllowed()) {
edge = GraphHelper.getEdgeForLabel(outVertex, edgeLabel);
if (shouldUpdateReverseAttribute) {
GraphHelper.setProperty(outVertex, propertyName, null);
}
} else {
// Cannot unset a required attribute.
throw new NullRequiredAttributeException(
"Cannot unset required attribute "
+ GraphHelper.getQualifiedFieldName(type, attributeName)
+ " on "
+ string(outVertex)
+ " edge = "
+ edgeLabel);
}
break;
case ARRAY:
// If its array attribute, find the right edge between the two vertices and update array
// property
List<String> elements = outVertex.getProperty(propertyName);
if (elements != null) {
elements =
new ArrayList<>(
elements); // Make a copy, else list.remove reflects on titan.getProperty()
for (String elementEdgeId : elements) {
Edge elementEdge = graphHelper.getEdgeByEdgeId(outVertex, edgeLabel, elementEdgeId);
if (elementEdge == null) {
continue;
}
Vertex elementVertex = elementEdge.getVertex(Direction.IN);
if (elementVertex.getId().toString().equals(inVertex.getId().toString())) {
edge = elementEdge;
// TODO element.size includes deleted items as well. should exclude
if (!attributeInfo.multiplicity.nullAllowed()
&& elements.size() <= attributeInfo.multiplicity.lower) {
// Deleting this edge would violate the attribute's lower bound.
throw new NullRequiredAttributeException(
"Cannot remove array element from required attribute "
+ GraphHelper.getQualifiedFieldName(type, attributeName)
+ " on "
+ string(outVertex)
+ " "
+ string(elementEdge));
}
if (shouldUpdateReverseAttribute) {
// if composite attribute, remove the reference as well. else, just remove the edge
// for example, when table is deleted, process still references the table
// but when column is deleted, table will not reference the deleted column
LOG.debug(
"Removing edge {} from the array attribute {}",
string(elementEdge),
attributeName);
elements.remove(elementEdge.getId().toString());
GraphHelper.setProperty(outVertex, propertyName, elements);
break;
}
}
}
}
break;
case MAP:
// If its map attribute, find the right edge between two vertices and update map property
List<String> keys = outVertex.getProperty(propertyName);
if (keys != null) {
keys =
new ArrayList<>(
keys); // Make a copy, else list.remove reflects on titan.getProperty()
for (String key : keys) {
String keyPropertyName = GraphHelper.getQualifiedNameForMapKey(propertyName, key);
String mapEdgeId = outVertex.getProperty(keyPropertyName);
Edge mapEdge = graphHelper.getEdgeByEdgeId(outVertex, keyPropertyName, mapEdgeId);
Vertex mapVertex = mapEdge.getVertex(Direction.IN);
if (mapVertex.getId().toString().equals(inVertex.getId().toString())) {
// TODO keys.size includes deleted items as well. should exclude
if (attributeInfo.multiplicity.nullAllowed()
|| keys.size() > attributeInfo.multiplicity.lower) {
edge = mapEdge;
} else {
// Deleting this entry would violate the attribute's lower bound.
throw new NullRequiredAttributeException(
"Cannot remove map entry "
+ keyPropertyName
+ " from required attribute "
+ GraphHelper.getQualifiedFieldName(type, attributeName)
+ " on "
+ string(outVertex)
+ " "
+ string(mapEdge));
}
if (shouldUpdateReverseAttribute) {
// remove this key
LOG.debug(
"Removing edge {}, key {} from the map attribute {}",
string(mapEdge),
key,
attributeName);
keys.remove(key);
GraphHelper.setProperty(outVertex, propertyName, keys);
GraphHelper.setProperty(outVertex, keyPropertyName, null);
}
break;
}
}
}
break;
case STRUCT:
case TRAIT:
break;
default:
throw new IllegalStateException(
"There can't be an edge from "
+ string(outVertex)
+ " to "
+ string(inVertex)
+ " with attribute name "
+ attributeName
+ " which is not class/array/map attribute");
}
if (edge != null) {
deleteEdge(edge, false);
RequestContext requestContext = RequestContext.get();
GraphHelper.setProperty(
outVertex,
Constants.MODIFICATION_TIMESTAMP_PROPERTY_KEY,
requestContext.getRequestTime());
requestContext.recordEntityUpdate(outId);
}
}
protected AttributeInfo getAttributeForEdge(String edgLabel) throws AtlasException {
AtlasEdgeLabel atlasEdgeLabel = new AtlasEdgeLabel(edgLabel);
IDataType referenceType = typeSystem.getDataType(IDataType.class, atlasEdgeLabel.getTypeName());
return getFieldMapping(referenceType).fields.get(atlasEdgeLabel.getAttributeName());
}
protected FieldMapping getFieldMapping(IDataType type) {
switch (type.getTypeCategory()) {
case CLASS:
case TRAIT:
return ((HierarchicalType) type).fieldMapping();
case STRUCT:
return ((StructType) type).fieldMapping();
default:
throw new IllegalStateException("Type " + type + " doesn't have any fields!");
}
}
/**
* Delete all traits from the specified vertex.
*
* @param instanceVertex
* @throws AtlasException
*/
private void deleteAllTraits(Vertex instanceVertex) throws AtlasException {
List<String> traitNames = GraphHelper.getTraitNames(instanceVertex);
LOG.debug("Deleting traits {} for {}", traitNames, string(instanceVertex));
String typeName = GraphHelper.getTypeName(instanceVertex);
for (String traitNameToBeDeleted : traitNames) {
String relationshipLabel = GraphHelper.getTraitLabel(typeName, traitNameToBeDeleted);
deleteEdgeReference(instanceVertex, relationshipLabel, DataTypes.TypeCategory.TRAIT, false);
}
}
}
/**
* Deletes the edge between outvertex and inVertex. The edge is for attribute attributeName of
* outVertex
*
* @param outVertex
* @param inVertex
* @param attributeName
* @throws AtlasException
*/
protected void deleteEdgeBetweenVertices(Vertex outVertex, Vertex inVertex, String attributeName)
throws AtlasException {
LOG.debug(
"Removing edge from {} to {} with attribute name {}",
string(outVertex),
string(inVertex),
attributeName);
String typeName = GraphHelper.getTypeName(outVertex);
String outId = GraphHelper.getIdFromVertex(outVertex);
Id.EntityState state = GraphHelper.getState(outVertex);
if ((outId != null && RequestContext.get().isDeletedEntity(outId))
|| state == Id.EntityState.DELETED) {
// If the reference vertex is marked for deletion, skip updating the reference
return;
}
IDataType type = typeSystem.getDataType(IDataType.class, typeName);
AttributeInfo attributeInfo = getFieldMapping(type).fields.get(attributeName);
String propertyName = GraphHelper.getQualifiedFieldName(type, attributeName);
String edgeLabel = EDGE_LABEL_PREFIX + propertyName;
Edge edge = null;
switch (attributeInfo.dataType().getTypeCategory()) {
case CLASS:
// If its class attribute, its the only edge between two vertices
if (attributeInfo.multiplicity.nullAllowed()) {
edge = GraphHelper.getEdgeForLabel(outVertex, edgeLabel);
if (shouldUpdateReverseAttribute) {
GraphHelper.setProperty(outVertex, propertyName, null);
}
} else {
// Cannot unset a required attribute.
throw new NullRequiredAttributeException(
"Cannot unset required attribute "
+ GraphHelper.getQualifiedFieldName(type, attributeName)
+ " on "
+ string(outVertex)
+ " edge = "
+ edgeLabel);
}
break;
case ARRAY:
// If its array attribute, find the right edge between the two vertices and update array
// property
List<String> elements = outVertex.getProperty(propertyName);
if (elements != null) {
elements =
new ArrayList<>(
elements); // Make a copy, else list.remove reflects on titan.getProperty()
for (String elementEdgeId : elements) {
Edge elementEdge = graphHelper.getEdgeByEdgeId(outVertex, edgeLabel, elementEdgeId);
if (elementEdge == null) {
continue;
}
Vertex elementVertex = elementEdge.getVertex(Direction.IN);
if (elementVertex.getId().toString().equals(inVertex.getId().toString())) {
edge = elementEdge;
// TODO element.size includes deleted items as well. should exclude
if (!attributeInfo.multiplicity.nullAllowed()
&& elements.size() <= attributeInfo.multiplicity.lower) {
// Deleting this edge would violate the attribute's lower bound.
throw new NullRequiredAttributeException(
"Cannot remove array element from required attribute "
+ GraphHelper.getQualifiedFieldName(type, attributeName)
+ " on "
+ string(outVertex)
+ " "
+ string(elementEdge));
}
if (shouldUpdateReverseAttribute) {
// if composite attribute, remove the reference as well. else, just remove the edge
// for example, when table is deleted, process still references the table
// but when column is deleted, table will not reference the deleted column
LOG.debug(
"Removing edge {} from the array attribute {}",
string(elementEdge),
attributeName);
elements.remove(elementEdge.getId().toString());
GraphHelper.setProperty(outVertex, propertyName, elements);
break;
}
}
}
}
break;
case MAP:
// If its map attribute, find the right edge between two vertices and update map property
List<String> keys = outVertex.getProperty(propertyName);
if (keys != null) {
keys =
new ArrayList<>(
keys); // Make a copy, else list.remove reflects on titan.getProperty()
for (String key : keys) {
String keyPropertyName = GraphHelper.getQualifiedNameForMapKey(propertyName, key);
String mapEdgeId = outVertex.getProperty(keyPropertyName);
Edge mapEdge = graphHelper.getEdgeByEdgeId(outVertex, keyPropertyName, mapEdgeId);
Vertex mapVertex = mapEdge.getVertex(Direction.IN);
if (mapVertex.getId().toString().equals(inVertex.getId().toString())) {
// TODO keys.size includes deleted items as well. should exclude
if (attributeInfo.multiplicity.nullAllowed()
|| keys.size() > attributeInfo.multiplicity.lower) {
edge = mapEdge;
} else {
// Deleting this entry would violate the attribute's lower bound.
throw new NullRequiredAttributeException(
"Cannot remove map entry "
+ keyPropertyName
+ " from required attribute "
+ GraphHelper.getQualifiedFieldName(type, attributeName)
+ " on "
+ string(outVertex)
+ " "
+ string(mapEdge));
}
if (shouldUpdateReverseAttribute) {
// remove this key
LOG.debug(
"Removing edge {}, key {} from the map attribute {}",
string(mapEdge),
key,
attributeName);
keys.remove(key);
GraphHelper.setProperty(outVertex, propertyName, keys);
GraphHelper.setProperty(outVertex, keyPropertyName, null);
}
break;
}
}
}
break;
case STRUCT:
case TRAIT:
break;
default:
throw new IllegalStateException(
"There can't be an edge from "
+ string(outVertex)
+ " to "
+ string(inVertex)
+ " with attribute name "
+ attributeName
+ " which is not class/array/map attribute");
}
if (edge != null) {
deleteEdge(edge, false);
RequestContext requestContext = RequestContext.get();
GraphHelper.setProperty(
outVertex,
Constants.MODIFICATION_TIMESTAMP_PROPERTY_KEY,
requestContext.getRequestTime());
requestContext.recordEntityUpdate(outId);
}
}
/**
* Deleting any type vertex. Goes over the complex attributes and removes the references
*
* @param instanceVertex
* @throws AtlasException
*/
protected void deleteTypeVertex(Vertex instanceVertex, boolean force) throws AtlasException {
LOG.debug("Deleting {}", string(instanceVertex));
String typeName = GraphHelper.getTypeName(instanceVertex);
IDataType type = typeSystem.getDataType(IDataType.class, typeName);
FieldMapping fieldMapping = getFieldMapping(type);
for (AttributeInfo attributeInfo : fieldMapping.fields.values()) {
LOG.debug("Deleting attribute {} for {}", attributeInfo.name, string(instanceVertex));
String edgeLabel = GraphHelper.getEdgeLabel(type, attributeInfo);
switch (attributeInfo.dataType().getTypeCategory()) {
case CLASS:
// If its class attribute, delete the reference
deleteEdgeReference(
instanceVertex, edgeLabel, DataTypes.TypeCategory.CLASS, attributeInfo.isComposite);
break;
case STRUCT:
// If its struct attribute, delete the reference
deleteEdgeReference(instanceVertex, edgeLabel, DataTypes.TypeCategory.STRUCT, false);
break;
case ARRAY:
// For array attribute, if the element is struct/class, delete all the references
IDataType elementType = ((DataTypes.ArrayType) attributeInfo.dataType()).getElemType();
DataTypes.TypeCategory elementTypeCategory = elementType.getTypeCategory();
if (elementTypeCategory == DataTypes.TypeCategory.STRUCT
|| elementTypeCategory == DataTypes.TypeCategory.CLASS) {
Iterator<Edge> edges = GraphHelper.getOutGoingEdgesByLabel(instanceVertex, edgeLabel);
if (edges != null) {
while (edges.hasNext()) {
Edge edge = edges.next();
deleteEdgeReference(
edge, elementType.getTypeCategory(), attributeInfo.isComposite, false);
}
}
}
break;
case MAP:
// For map attribute, if the value type is struct/class, delete all the references
DataTypes.MapType mapType = (DataTypes.MapType) attributeInfo.dataType();
DataTypes.TypeCategory valueTypeCategory = mapType.getValueType().getTypeCategory();
String propertyName = GraphHelper.getQualifiedFieldName(type, attributeInfo.name);
if (valueTypeCategory == DataTypes.TypeCategory.STRUCT
|| valueTypeCategory == DataTypes.TypeCategory.CLASS) {
List<String> keys = instanceVertex.getProperty(propertyName);
if (keys != null) {
for (String key : keys) {
String mapEdgeLabel = GraphHelper.getQualifiedNameForMapKey(edgeLabel, key);
deleteEdgeReference(
instanceVertex, mapEdgeLabel, valueTypeCategory, attributeInfo.isComposite);
}
}
}
}
}
deleteVertex(instanceVertex, force);
}
public String getFieldNameInVertex(IDataType<?> dataType, String attrName) throws AtlasException {
return GraphHelper.getQualifiedFieldName(dataType, attrName);
}
@Override
public String getEdgeLabel(IDataType<?> dataType, AttributeInfo aInfo) throws AtlasException {
return GraphHelper.getEdgeLabel(dataType, aInfo);
}
/** An implementation backed by a Graph database provided as a Graph Service. */
@Singleton
public class GraphBackedMetadataRepository implements MetadataRepository {
private static final Logger LOG = LoggerFactory.getLogger(GraphBackedMetadataRepository.class);
private static TypeSystem typeSystem = TypeSystem.getInstance();
private static final GraphHelper graphHelper = GraphHelper.getInstance();
private final TitanGraph titanGraph;
private DeleteHandler deleteHandler;
private GraphToTypedInstanceMapper graphToInstanceMapper;
@Inject
public GraphBackedMetadataRepository(
GraphProvider<TitanGraph> graphProvider, DeleteHandler deleteHandler) {
this.titanGraph = graphProvider.get();
graphToInstanceMapper = new GraphToTypedInstanceMapper(titanGraph);
this.deleteHandler = deleteHandler;
}
public GraphToTypedInstanceMapper getGraphToInstanceMapper() {
return graphToInstanceMapper;
}
@Override
public String getTypeAttributeName() {
return Constants.ENTITY_TYPE_PROPERTY_KEY;
}
@Override
public String getStateAttributeName() {
return Constants.STATE_PROPERTY_KEY;
}
/**
* Returns the property key used to store super type names.
*
* @return property key used to store super type names.
*/
@Override
public String getSuperTypeAttributeName() {
return Constants.SUPER_TYPES_PROPERTY_KEY;
}
public String getIdAttributeName() {
return Constants.GUID_PROPERTY_KEY;
}
@Override
public String getTraitLabel(IDataType<?> dataType, String traitName) {
return GraphHelper.getTraitLabel(dataType.getName(), traitName);
}
@Override
public String getFieldNameInVertex(IDataType<?> dataType, AttributeInfo aInfo)
throws AtlasException {
if (aInfo.name.startsWith(Constants.INTERNAL_PROPERTY_KEY_PREFIX)) {
return aInfo.name;
}
return GraphHelper.getQualifiedFieldName(dataType, aInfo.name);
}
public String getFieldNameInVertex(IDataType<?> dataType, String attrName) throws AtlasException {
return GraphHelper.getQualifiedFieldName(dataType, attrName);
}
@Override
public String getEdgeLabel(IDataType<?> dataType, AttributeInfo aInfo) throws AtlasException {
return GraphHelper.getEdgeLabel(dataType, aInfo);
}
@Override
@GraphTransaction
public List<String> createEntities(ITypedReferenceableInstance... entities)
throws RepositoryException, EntityExistsException {
LOG.debug("adding entities={}", entities);
try {
TypedInstanceToGraphMapper instanceToGraphMapper =
new TypedInstanceToGraphMapper(graphToInstanceMapper, deleteHandler);
instanceToGraphMapper.mapTypedInstanceToGraph(
TypedInstanceToGraphMapper.Operation.CREATE, entities);
return RequestContext.get().getCreatedEntityIds();
} catch (EntityExistsException e) {
throw e;
} catch (AtlasException e) {
throw new RepositoryException(e);
}
}
@Override
@GraphTransaction
public ITypedReferenceableInstance getEntityDefinition(String guid)
throws RepositoryException, EntityNotFoundException {
LOG.debug("Retrieving entity with guid={}", guid);
Vertex instanceVertex = graphHelper.getVertexForGUID(guid);
try {
return graphToInstanceMapper.mapGraphToTypedInstance(guid, instanceVertex);
} catch (AtlasException e) {
throw new RepositoryException(e);
}
}
@Override
@GraphTransaction
public ITypedReferenceableInstance getEntityDefinition(
String entityType, String attribute, Object value) throws AtlasException {
LOG.debug("Retrieving entity with type={} and {}={}", entityType, attribute, value);
IDataType type = typeSystem.getDataType(IDataType.class, entityType);
String propertyKey = getFieldNameInVertex(type, attribute);
Vertex instanceVertex =
graphHelper.findVertex(
propertyKey,
value,
Constants.ENTITY_TYPE_PROPERTY_KEY,
entityType,
Constants.STATE_PROPERTY_KEY,
Id.EntityState.ACTIVE.name());
String guid = instanceVertex.getProperty(Constants.GUID_PROPERTY_KEY);
return graphToInstanceMapper.mapGraphToTypedInstance(guid, instanceVertex);
}
@Override
@GraphTransaction
public List<String> getEntityList(String entityType) throws RepositoryException {
LOG.debug("Retrieving entity list for type={}", entityType);
GraphQuery query = titanGraph.query().has(Constants.ENTITY_TYPE_PROPERTY_KEY, entityType);
Iterator<Vertex> results = query.vertices().iterator();
if (!results.hasNext()) {
return Collections.emptyList();
}
ArrayList<String> entityList = new ArrayList<>();
while (results.hasNext()) {
Vertex vertex = results.next();
entityList.add(vertex.<String>getProperty(Constants.GUID_PROPERTY_KEY));
}
return entityList;
}
/**
* Gets the list of trait names for a given entity represented by a guid.
*
* @param guid globally unique identifier for the entity
* @return a list of trait names for the given entity guid
* @throws RepositoryException
*/
@Override
@GraphTransaction
public List<String> getTraitNames(String guid) throws AtlasException {
LOG.debug("Retrieving trait names for entity={}", guid);
Vertex instanceVertex = graphHelper.getVertexForGUID(guid);
return GraphHelper.getTraitNames(instanceVertex);
}
/**
* Adds a new trait to an existing entity represented by a guid.
*
* @param guid globally unique identifier for the entity
* @param traitInstance trait instance that needs to be added to entity
* @throws RepositoryException
*/
@Override
@GraphTransaction
public void addTrait(String guid, ITypedStruct traitInstance) throws RepositoryException {
Preconditions.checkNotNull(traitInstance, "Trait instance cannot be null");
final String traitName = traitInstance.getTypeName();
LOG.debug("Adding a new trait={} for entity={}", traitName, guid);
try {
Vertex instanceVertex = graphHelper.getVertexForGUID(guid);
// add the trait instance as a new vertex
final String typeName = GraphHelper.getTypeName(instanceVertex);
TypedInstanceToGraphMapper instanceToGraphMapper =
new TypedInstanceToGraphMapper(graphToInstanceMapper, deleteHandler);
instanceToGraphMapper.mapTraitInstanceToVertex(
traitInstance, typeSystem.getDataType(ClassType.class, typeName), instanceVertex);
// update the traits in entity once adding trait instance is successful
GraphHelper.addProperty(instanceVertex, Constants.TRAIT_NAMES_PROPERTY_KEY, traitName);
GraphHelper.setProperty(
instanceVertex,
Constants.MODIFICATION_TIMESTAMP_PROPERTY_KEY,
RequestContext.get().getRequestTime());
} catch (RepositoryException e) {
throw e;
} catch (Exception e) {
throw new RepositoryException(e);
}
}
/**
* Deletes a given trait from an existing entity represented by a guid.
*
* @param guid globally unique identifier for the entity
* @param traitNameToBeDeleted name of the trait
* @throws RepositoryException
*/
@Override
@GraphTransaction
public void deleteTrait(String guid, String traitNameToBeDeleted)
throws TraitNotFoundException, EntityNotFoundException, RepositoryException {
LOG.debug("Deleting trait={} from entity={}", traitNameToBeDeleted, guid);
Vertex instanceVertex = graphHelper.getVertexForGUID(guid);
List<String> traitNames = GraphHelper.getTraitNames(instanceVertex);
if (!traitNames.contains(traitNameToBeDeleted)) {
throw new TraitNotFoundException(
"Could not find trait="
+ traitNameToBeDeleted
+ " in the repository for entity: "
+ guid);
}
try {
final String entityTypeName = GraphHelper.getTypeName(instanceVertex);
String relationshipLabel = GraphHelper.getTraitLabel(entityTypeName, traitNameToBeDeleted);
Edge edge = GraphHelper.getEdgeForLabel(instanceVertex, relationshipLabel);
deleteHandler.deleteEdgeReference(edge, DataTypes.TypeCategory.TRAIT, false, true);
// update the traits in entity once trait removal is successful
traitNames.remove(traitNameToBeDeleted);
updateTraits(instanceVertex, traitNames);
} catch (Exception e) {
throw new RepositoryException(e);
}
}
private void updateTraits(Vertex instanceVertex, List<String> traitNames) {
// remove the key
instanceVertex.removeProperty(Constants.TRAIT_NAMES_PROPERTY_KEY);
// add it back again
for (String traitName : traitNames) {
GraphHelper.addProperty(instanceVertex, Constants.TRAIT_NAMES_PROPERTY_KEY, traitName);
}
GraphHelper.setProperty(
instanceVertex,
Constants.MODIFICATION_TIMESTAMP_PROPERTY_KEY,
RequestContext.get().getRequestTime());
}
@Override
@GraphTransaction
public AtlasClient.EntityResult updateEntities(ITypedReferenceableInstance... entitiesUpdated)
throws RepositoryException {
LOG.debug("updating entity {}", entitiesUpdated);
try {
TypedInstanceToGraphMapper instanceToGraphMapper =
new TypedInstanceToGraphMapper(graphToInstanceMapper, deleteHandler);
instanceToGraphMapper.mapTypedInstanceToGraph(
TypedInstanceToGraphMapper.Operation.UPDATE_FULL, entitiesUpdated);
RequestContext requestContext = RequestContext.get();
return new AtlasClient.EntityResult(
requestContext.getCreatedEntityIds(),
requestContext.getUpdatedEntityIds(),
requestContext.getDeletedEntityIds());
} catch (AtlasException e) {
throw new RepositoryException(e);
}
}
@Override
@GraphTransaction
public AtlasClient.EntityResult updatePartial(ITypedReferenceableInstance entity)
throws RepositoryException {
LOG.debug("updating entity {}", entity);
try {
TypedInstanceToGraphMapper instanceToGraphMapper =
new TypedInstanceToGraphMapper(graphToInstanceMapper, deleteHandler);
instanceToGraphMapper.mapTypedInstanceToGraph(
TypedInstanceToGraphMapper.Operation.UPDATE_PARTIAL, entity);
RequestContext requestContext = RequestContext.get();
return new AtlasClient.EntityResult(
requestContext.getCreatedEntityIds(),
requestContext.getUpdatedEntityIds(),
requestContext.getDeletedEntityIds());
} catch (AtlasException e) {
throw new RepositoryException(e);
}
}
@Override
@GraphTransaction
public AtlasClient.EntityResult deleteEntities(List<String> guids) throws RepositoryException {
if (guids == null || guids.size() == 0) {
throw new IllegalArgumentException("guids must be non-null and non-empty");
}
for (String guid : guids) {
if (guid == null) {
LOG.warn("deleteEntities: Ignoring null guid");
continue;
}
try {
Vertex instanceVertex = graphHelper.getVertexForGUID(guid);
deleteHandler.deleteEntity(instanceVertex);
} catch (EntityNotFoundException e) {
// Entity does not exist - treat as non-error, since the caller
// wanted to delete the entity and it's already gone.
LOG.info("Deletion request ignored for non-existent entity with guid " + guid);
continue;
} catch (AtlasException e) {
throw new RepositoryException(e);
}
}
RequestContext requestContext = RequestContext.get();
return new AtlasClient.EntityResult(
requestContext.getCreatedEntityIds(),
requestContext.getUpdatedEntityIds(),
requestContext.getDeletedEntityIds());
}
}
@Override
public String getTraitLabel(IDataType<?> dataType, String traitName) {
return GraphHelper.getTraitLabel(dataType.getName(), traitName);
}
