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A fork of Tinkergraph for more type safety and less memory usage
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/*
* Licensed to the Apache Software Foundation (ASF) under one
* or more contributor license agreements. See the NOTICE file
* distributed with this work for additional information
* regarding copyright ownership. The ASF licenses this file
* to you 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.
*/
package org.apache.tinkerpop.gremlin.tinkergraph.structure;
import org.apache.commons.configuration.BaseConfiguration;
import org.apache.commons.configuration.Configuration;
import org.apache.tinkerpop.gremlin.structure.Edge;
import org.apache.tinkerpop.gremlin.structure.Vertex;
import org.apache.tinkerpop.gremlin.structure.io.AbstractIoRegistry;
import org.apache.tinkerpop.gremlin.structure.io.GraphReader;
import org.apache.tinkerpop.gremlin.structure.io.GraphWriter;
import org.apache.tinkerpop.gremlin.structure.io.IoRegistry;
import org.apache.tinkerpop.gremlin.structure.io.graphson.GraphSONIo;
import org.apache.tinkerpop.gremlin.structure.io.graphson.GraphSONTokens;
import org.apache.tinkerpop.gremlin.structure.io.graphson.GraphSONUtil;
import org.apache.tinkerpop.gremlin.structure.io.gryo.GryoIo;
import org.apache.tinkerpop.gremlin.structure.io.gryo.GryoReader;
import org.apache.tinkerpop.gremlin.structure.io.gryo.GryoWriter;
import org.apache.tinkerpop.gremlin.structure.util.Attachable;
import org.apache.tinkerpop.gremlin.structure.util.detached.DetachedEdge;
import org.apache.tinkerpop.gremlin.structure.util.detached.DetachedVertex;
import org.apache.tinkerpop.shaded.jackson.core.JsonGenerator;
import org.apache.tinkerpop.shaded.jackson.core.JsonParser;
import org.apache.tinkerpop.shaded.jackson.core.JsonProcessingException;
import org.apache.tinkerpop.shaded.jackson.databind.DeserializationContext;
import org.apache.tinkerpop.shaded.jackson.databind.SerializerProvider;
import org.apache.tinkerpop.shaded.jackson.databind.deser.std.StdDeserializer;
import org.apache.tinkerpop.shaded.jackson.databind.jsontype.TypeSerializer;
import org.apache.tinkerpop.shaded.jackson.databind.module.SimpleModule;
import org.apache.tinkerpop.shaded.jackson.databind.ser.std.StdSerializer;
import org.apache.tinkerpop.shaded.kryo.Kryo;
import org.apache.tinkerpop.shaded.kryo.Serializer;
import org.apache.tinkerpop.shaded.kryo.io.Input;
import org.apache.tinkerpop.shaded.kryo.io.Output;
import java.io.ByteArrayInputStream;
import java.io.ByteArrayOutputStream;
import java.io.IOException;
import java.util.ArrayList;
import java.util.HashMap;
import java.util.Iterator;
import java.util.List;
import java.util.Map;
/**
* An implementation of the {@link IoRegistry} interface that provides serializers with custom configurations for
* implementation specific classes that might need to be serialized. This registry allows a {@link TinkerGraph} to
* be serialized directly which is useful for moving small graphs around on the network.
*
* Most providers need not implement this kind of custom serializer as they will deal with much larger graphs that
* wouldn't be practical to serialize in this fashion. This is a bit of a special case for TinkerGraph given its
* in-memory status. Typical implementations would create serializers for a complex vertex identifier or a
* custom data class like a "geographic point".
*
* @author Stephen Mallette (http://stephen.genoprime.com)
*/
public final class TinkerIoRegistryV1d0 extends AbstractIoRegistry {
private static final TinkerIoRegistryV1d0 INSTANCE = new TinkerIoRegistryV1d0();
private TinkerIoRegistryV1d0() {
register(GryoIo.class, TinkerGraph.class, new TinkerGraphGryoSerializer());
register(GraphSONIo.class, null, new TinkerModule());
}
public static TinkerIoRegistryV1d0 instance() {
return INSTANCE;
}
/**
* Provides a method to serialize an entire {@link TinkerGraph} into itself for Gryo. This is useful when
* shipping small graphs around through Gremlin Server. Reuses the existing Kryo instance for serialization.
*/
final static class TinkerGraphGryoSerializer extends Serializer {
@Override
public void write(final Kryo kryo, final Output output, final TinkerGraph graph) {
try (final ByteArrayOutputStream stream = new ByteArrayOutputStream()) {
GryoWriter.build().mapper(() -> kryo).create().writeGraph(stream, graph);
final byte[] bytes = stream.toByteArray();
output.writeInt(bytes.length);
output.write(bytes);
} catch (Exception io) {
throw new RuntimeException(io);
}
}
@Override
public TinkerGraph read(final Kryo kryo, final Input input, final Class tinkerGraphClass) {
final Configuration conf = new BaseConfiguration();
conf.setProperty("gremlin.tinkergraph.defaultVertexPropertyCardinality", "list");
final TinkerGraph graph = TinkerGraph.open(conf);
final int len = input.readInt();
final byte[] bytes = input.readBytes(len);
try (final ByteArrayInputStream stream = new ByteArrayInputStream(bytes)) {
GryoReader.build().mapper(() -> kryo).create().readGraph(stream, graph);
} catch (Exception io) {
throw new RuntimeException(io);
}
return graph;
}
}
/**
* Provides a method to serialize an entire {@link TinkerGraph} into itself for GraphSON. This is useful when
* shipping small graphs around through Gremlin Server.
*/
final static class TinkerModule extends SimpleModule {
public TinkerModule() {
super("tinkergraph-1.0");
addSerializer(TinkerGraph.class, new TinkerGraphJacksonSerializer());
addDeserializer(TinkerGraph.class, new TinkerGraphJacksonDeserializer());
}
}
/**
* Serializes the graph into an edge list format. Edge list is a better choices than adjacency list (which is
* typically standard from the {@link GraphReader} and {@link GraphWriter} perspective) in this case because
* the use case for this isn't around massive graphs. The use case is for "small" subgraphs that are being
* shipped over the wire from Gremlin Server. Edge list format is a bit easier for non-JVM languages to work
* with as a format and doesn't require a cache for loading (as vertex labels are not serialized in adjacency
* list).
*/
final static class TinkerGraphJacksonSerializer extends StdSerializer {
public TinkerGraphJacksonSerializer() {
super(TinkerGraph.class);
}
@Override
public void serialize(final TinkerGraph graph, final JsonGenerator jsonGenerator, final SerializerProvider serializerProvider)
throws IOException {
jsonGenerator.writeStartObject();
jsonGenerator.writeFieldName(GraphSONTokens.VERTICES);
jsonGenerator.writeStartArray();
final Iterator vertices = graph.vertices();
while (vertices.hasNext()) {
serializerProvider.defaultSerializeValue(vertices.next(), jsonGenerator);
}
jsonGenerator.writeEndArray();
jsonGenerator.writeFieldName(GraphSONTokens.EDGES);
jsonGenerator.writeStartArray();
final Iterator edges = graph.edges();
while (edges.hasNext()) {
serializerProvider.defaultSerializeValue(edges.next(), jsonGenerator);
}
jsonGenerator.writeEndArray();
jsonGenerator.writeEndObject();
}
@Override
public void serializeWithType(final TinkerGraph graph, final JsonGenerator jsonGenerator,
final SerializerProvider serializerProvider, final TypeSerializer typeSerializer) throws IOException {
jsonGenerator.writeStartObject();
jsonGenerator.writeStringField(GraphSONTokens.CLASS, TinkerGraph.class.getName());
jsonGenerator.writeFieldName(GraphSONTokens.VERTICES);
jsonGenerator.writeStartArray();
jsonGenerator.writeString(ArrayList.class.getName());
jsonGenerator.writeStartArray();
final Iterator vertices = graph.vertices();
while (vertices.hasNext()) {
GraphSONUtil.writeWithType(vertices.next(), jsonGenerator, serializerProvider, typeSerializer);
}
jsonGenerator.writeEndArray();
jsonGenerator.writeEndArray();
jsonGenerator.writeFieldName(GraphSONTokens.EDGES);
jsonGenerator.writeStartArray();
jsonGenerator.writeString(ArrayList.class.getName());
jsonGenerator.writeStartArray();
final Iterator edges = graph.edges();
while (edges.hasNext()) {
GraphSONUtil.writeWithType(edges.next(), jsonGenerator, serializerProvider, typeSerializer);
}
jsonGenerator.writeEndArray();
jsonGenerator.writeEndArray();
jsonGenerator.writeEndObject();
}
}
/**
* Deserializes the edge list format.
*/
static class TinkerGraphJacksonDeserializer extends StdDeserializer {
public TinkerGraphJacksonDeserializer() {
super(TinkerGraph.class);
}
@Override
public TinkerGraph deserialize(JsonParser jsonParser, DeserializationContext deserializationContext) throws IOException, JsonProcessingException {
final Configuration conf = new BaseConfiguration();
conf.setProperty("gremlin.tinkergraph.defaultVertexPropertyCardinality", "list");
final TinkerGraph graph = TinkerGraph.open(conf);
final List> edges;
final List> vertices;
if (!jsonParser.getCurrentToken().isStructStart()) {
if (!jsonParser.getCurrentName().equals(GraphSONTokens.VERTICES))
throw new IOException(String.format("Expected a '%s' key", GraphSONTokens.VERTICES));
jsonParser.nextToken();
vertices = (List>) deserializationContext.readValue(jsonParser, ArrayList.class);
jsonParser.nextToken();
if (!jsonParser.getCurrentName().equals(GraphSONTokens.EDGES))
throw new IOException(String.format("Expected a '%s' key", GraphSONTokens.EDGES));
jsonParser.nextToken();
edges = (List>) deserializationContext.readValue(jsonParser, ArrayList.class);
} else {
final Map graphData = deserializationContext.readValue(jsonParser, HashMap.class);
vertices = (List>) graphData.get(GraphSONTokens.VERTICES);
edges = (List>) graphData.get(GraphSONTokens.EDGES);
}
for (Map vertexData : vertices) {
final DetachedVertex detached = new DetachedVertex(vertexData.get(GraphSONTokens.ID),
vertexData.get(GraphSONTokens.LABEL).toString(), (Map) vertexData.get(GraphSONTokens.PROPERTIES));
detached.attach(Attachable.Method.getOrCreate(graph));
}
for (Map edgeData : edges) {
final DetachedEdge detached = new DetachedEdge(edgeData.get(GraphSONTokens.ID),
edgeData.get(GraphSONTokens.LABEL).toString(), (Map) edgeData.get(GraphSONTokens.PROPERTIES),
edgeData.get(GraphSONTokens.OUT), edgeData.get(GraphSONTokens.OUT_LABEL).toString(),
edgeData.get(GraphSONTokens.IN), edgeData.get(GraphSONTokens.IN_LABEL).toString());
detached.attach(Attachable.Method.getOrCreate(graph));
}
return graph;
}
}
}