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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
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specific language governing permissions and limitations
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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 {
    static final String SERVER_HOST = "localhost";
    static final int SERVER_PORT = 8182;
    static final String VERTEX_LABEL = "connection";

    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(SERVER_HOST).port(SERVER_PORT).create();
        GraphTraversalSource g = traversal().withRemote(DriverRemoteConnection.using(cluster, "g"));

        // Simple query to verify connection
        g.addV(VERTEX_LABEL).iterate();
        long count = g.V().hasLabel(VERTEX_LABEL).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(SERVER_HOST).
            channelizer(Channelizer.WebSocketChannelizer.class).
            keepAliveInterval(180000).
            maxConnectionPoolSize(8).
            path("/gremlin").
            port(SERVER_PORT).
            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(SERVER_HOST).
            port(SERVER_PORT).
            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 {}
}