gremlin-examples/gremlin-java/Connections.java

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package examples;

import org.apache.tinkerpop.gremlin.driver.Channelizer;
import org.apache.tinkerpop.gremlin.driver.Client;
import org.apache.tinkerpop.gremlin.driver.Cluster;
import org.apache.tinkerpop.gremlin.driver.remote.DriverRemoteConnection;
import org.apache.tinkerpop.gremlin.process.traversal.dsl.graph.GraphTraversalSource;
import org.apache.tinkerpop.gremlin.structure.Graph;
import org.apache.tinkerpop.gremlin.structure.io.AbstractIoRegistry;
import org.apache.tinkerpop.gremlin.structure.io.IoRegistry;
import org.apache.tinkerpop.gremlin.structure.io.binary.TypeSerializerRegistry;
import org.apache.tinkerpop.gremlin.tinkergraph.structure.TinkerGraph;
import org.apache.tinkerpop.gremlin.util.MessageSerializer;
import org.apache.tinkerpop.gremlin.util.ser.GraphBinaryMessageSerializerV1;

import static org.apache.tinkerpop.gremlin.process.traversal.AnonymousTraversalSource.traversal;

public class Connections {
    public static void main(String[] args) throws Exception {
        withEmbedded();
        withRemote();
        withCluster();
        withSerializer();
    }

    // Creating an embedded graph
    private static void withEmbedded() throws Exception {
        Graph graph = TinkerGraph.open();
        GraphTraversalSource g = traversal().withEmbedded(graph);

        g.addV().iterate();
        long count = g.V().count().next();
        System.out.println("Vertex count: " + count);

        g.close();
    }

    // Connecting to the server
    private static void withRemote() throws Exception {
        Cluster cluster = Cluster.build("localhost").port(8182).create();
        GraphTraversalSource g = traversal().withRemote(DriverRemoteConnection.using(cluster, "g"));

        // Drop existing vertices
        g.V().drop().iterate();

        // Simple query to verify connection
        g.addV().iterate();
        long count = g.V().count().next();
        System.out.println("Vertex count: " + count);

        // Cleanup
        cluster.close();
        g.close();
    }

    // Connecting and customizing configurations with a cluster
    // See reference/#gremlin-java-configuration for full list of configurations
    private static void withCluster() throws Exception {
        Cluster cluster = Cluster.build("localhost").
            channelizer(Channelizer.WebSocketChannelizer.class).
            keepAliveInterval(180000).
            maxConnectionPoolSize(8).
            path("/gremlin").
            port(8182).
            serializer(new GraphBinaryMessageSerializerV1()).
            create();
        GraphTraversalSource g = traversal().withRemote(DriverRemoteConnection.using(cluster, "g"));

        g.addV().iterate();
        long count = g.V().count().next();
        System.out.println("Vertex count: " + count);

        cluster.close();
        g.close();
    }

    // Connecting and specifying a serializer
    private static void withSerializer() throws Exception {
        IoRegistry registry = new FakeIoRegistry(); // an IoRegistry instance exposed by a specific graph provider
        TypeSerializerRegistry typeSerializerRegistry = TypeSerializerRegistry.build().addRegistry(registry).create();
        MessageSerializer serializer = new GraphBinaryMessageSerializerV1(typeSerializerRegistry);
        Cluster cluster = Cluster.build("localhost").
            serializer(serializer).
            create();
        Client client = cluster.connect();
        GraphTraversalSource g = traversal().withRemote(DriverRemoteConnection.using(client, "g"));

        g.addV().iterate();
        long count = g.V().count().next();
        System.out.println("Vertex count: " + count);

        cluster.close();
        g.close();
    }

    public static class FakeIoRegistry extends AbstractIoRegistry {}
}