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/**
* ============LICENSE_START=======================================================
* org.onap.aai
* ================================================================================
* Copyright © 2017-2018 AT&T Intellectual Property. All rights reserved.
* ================================================================================
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
* ============LICENSE_END=========================================================
*/
package org.onap.aai.migration;
import java.io.UnsupportedEncodingException;
import java.util.Collection;
import java.util.Collections;
import java.util.HashMap;
import java.util.HashSet;
import java.util.Iterator;
import java.util.Map;
import java.util.Optional;
import java.util.Set;
import org.apache.tinkerpop.gremlin.process.traversal.dsl.graph.GraphTraversalSource;
import org.apache.tinkerpop.gremlin.structure.Vertex;
import org.onap.aai.db.props.AAIProperties;
import org.onap.aai.exceptions.AAIException;
import org.onap.aai.introspection.Introspector;
import org.onap.aai.introspection.Loader;
import org.onap.aai.introspection.exceptions.AAIUnknownObjectException;
import org.onap.aai.serialization.db.DBSerializer;
import org.onap.aai.serialization.db.EdgeRules;
import org.onap.aai.serialization.db.EdgeType;
import org.onap.aai.serialization.engines.TransactionalGraphEngine;
import com.att.eelf.configuration.EELFLogger;
import com.att.eelf.configuration.EELFManager;
/**
* This class recursively merges two vertices passed in.
* <br>
* You can start with any two vertices, but after the vertices are merged based off the equality of their keys
*
*/
public class VertexMerge {
private final EELFLogger logger = EELFManager.getInstance().getLogger(this.getClass().getSimpleName());
private final GraphTraversalSource g;
private final TransactionalGraphEngine engine;
private final DBSerializer serializer;
private final EdgeRules rules;
private final Loader loader;
private final NotificationHelper notificationHelper;
private final boolean hasNotifications;
private VertexMerge(Builder builder) {
this.engine = builder.getEngine();
this.serializer = builder.getSerializer();
this.g = engine.asAdmin().getTraversalSource();
this.rules = EdgeRules.getInstance();
this.loader = builder.getLoader();
this.notificationHelper = builder.getHelper();
this.hasNotifications = builder.isHasNotifications();
}
/**
* Merges vertices. forceCopy is a map of the form [{aai-node-type}:{set of properties}]
* @param primary
* @param secondary
* @param forceCopy
* @throws AAIException
* @throws UnsupportedEncodingException
*/
public void performMerge(Vertex primary, Vertex secondary, Map<String, Set<String>> forceCopy) throws AAIException, UnsupportedEncodingException {
final Optional<Introspector> secondarySnapshot;
if (this.hasNotifications) {
secondarySnapshot = Optional.of(serializer.getLatestVersionView(secondary));
} else {
secondarySnapshot = Optional.empty();
}
mergeProperties(primary, secondary, forceCopy);
Collection<Vertex> secondaryChildren = this.engine.getQueryEngine().findChildren(secondary);
Collection<Vertex> primaryChildren = this.engine.getQueryEngine().findChildren(primary);
mergeChildren(primary, secondary, primaryChildren, secondaryChildren, forceCopy);
Collection<Vertex> secondaryCousins = this.engine.getQueryEngine().findCousinVertices(secondary);
Collection<Vertex> primaryCousins = this.engine.getQueryEngine().findCousinVertices(primary);
secondaryCousins.removeAll(primaryCousins);
logger.info("removing vertex after merge: " + secondary );
if (this.hasNotifications && secondarySnapshot.isPresent()) {
this.notificationHelper.addEvent(secondary, secondarySnapshot.get(), EventAction.DELETE, this.serializer.getURIForVertex(secondary, false));
}
secondary.remove();
for (Vertex v : secondaryCousins) {
this.rules.addEdgeIfPossible(g, v, primary);
}
if (this.hasNotifications) {
final Introspector primarySnapshot = serializer.getLatestVersionView(primary);
this.notificationHelper.addEvent(primary, primarySnapshot, EventAction.UPDATE, this.serializer.getURIForVertex(primary, false));
}
}
/**
* This method may go away if we choose to event on each modification performed
* @param primary
* @param secondary
* @param forceCopy
* @throws AAIException
* @throws UnsupportedEncodingException
*/
protected void performMergeHelper(Vertex primary, Vertex secondary, Map<String, Set<String>> forceCopy) throws AAIException, UnsupportedEncodingException {
mergeProperties(primary, secondary, forceCopy);
Collection<Vertex> secondaryChildren = this.engine.getQueryEngine().findChildren(secondary);
Collection<Vertex> primaryChildren = this.engine.getQueryEngine().findChildren(primary);
mergeChildren(primary, secondary, primaryChildren, secondaryChildren, forceCopy);
Collection<Vertex> secondaryCousins = this.engine.getQueryEngine().findCousinVertices(secondary);
Collection<Vertex> primaryCousins = this.engine.getQueryEngine().findCousinVertices(primary);
secondaryCousins.removeAll(primaryCousins);
secondary.remove();
for (Vertex v : secondaryCousins) {
this.rules.addEdgeIfPossible(g, v, primary);
}
}
private String getURI(Vertex v) throws UnsupportedEncodingException, AAIException {
Introspector obj = loader.introspectorFromName(v.<String>property(AAIProperties.NODE_TYPE).orElse(""));
this.serializer.dbToObject(Collections.singletonList(v), obj, 0, true, "false");
return obj.getURI();
}
private void mergeChildren(Vertex primary, Vertex secondary, Collection<Vertex> primaryChildren, Collection<Vertex> secondaryChildren, Map<String, Set<String>> forceCopy) throws UnsupportedEncodingException, AAIException {
Map<String, Vertex> primaryMap = uriMap(primaryChildren);
Map<String, Vertex> secondaryMap = uriMap(secondaryChildren);
Set<String> primaryKeys = new HashSet<>(primaryMap.keySet());
Set<String> secondaryKeys = new HashSet<>(secondaryMap.keySet());
primaryKeys.retainAll(secondaryKeys);
final Set<String> mergeItems = new HashSet<>(primaryKeys);
primaryKeys = new HashSet<>(primaryMap.keySet());
secondaryKeys = new HashSet<>(secondaryMap.keySet());
secondaryKeys.removeAll(primaryKeys);
final Set<String> copyItems = new HashSet<>(secondaryKeys);
for (String key : mergeItems) {
this.performMergeHelper(primaryMap.get(key), secondaryMap.get(key), forceCopy);
}
for (String key : copyItems) {
this.rules.addTreeEdgeIfPossible(g, secondaryMap.get(key), primary);
this.serializer.getEdgeBetween(EdgeType.TREE, secondary, secondaryMap.get(key)).remove();
}
}
private Map<String, Vertex> uriMap(Collection<Vertex> vertices) throws UnsupportedEncodingException, AAIException {
final Map<String, Vertex> result = new HashMap<>();
for (Vertex v : vertices) {
result.put(getURI(v), v);
}
return result;
}
private void mergeProperties(Vertex primary, Vertex secondary, Map<String, Set<String>> forceCopy) throws AAIUnknownObjectException {
final String primaryType = primary.<String>property(AAIProperties.NODE_TYPE).orElse("");
final String secondaryType = secondary.<String>property(AAIProperties.NODE_TYPE).orElse("");
final Introspector secondaryObj = loader.introspectorFromName(secondaryType);
secondary.properties().forEachRemaining(prop -> {
if (!primary.property(prop.key()).isPresent() || forceCopy.getOrDefault(primaryType, new HashSet<String>()).contains(prop.key())) {
primary.property(prop.key(), prop.value());
}
if (primary.property(prop.key()).isPresent() && secondary.property(prop.key()).isPresent() && secondaryObj.isListType(prop.key())) {
mergeCollection(primary, prop.key(), secondary.values(prop.key()));
}
});
}
private void mergeCollection(Vertex primary, String propName, Iterator<Object> secondaryValues) {
secondaryValues.forEachRemaining(item -> {
primary.property(propName, item);
});
}
public static class Builder {
private final TransactionalGraphEngine engine;
private final DBSerializer serializer;
private final Loader loader;
private NotificationHelper helper = null;
private boolean hasNotifications = false;
public Builder(Loader loader, TransactionalGraphEngine engine, DBSerializer serializer) {
this.loader = loader;
this.engine = engine;
this.serializer = serializer;
}
public Builder addNotifications(NotificationHelper helper) {
this.helper = helper;
this.hasNotifications = true;
return this;
}
public VertexMerge build() {
return new VertexMerge(this);
}
protected TransactionalGraphEngine getEngine() {
return engine;
}
protected DBSerializer getSerializer() {
return serializer;
}
protected Loader getLoader() {
return loader;
}
protected NotificationHelper getHelper() {
return helper;
}
protected boolean isHasNotifications() {
return hasNotifications;
}
}
}
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