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There is a newer version: 6.1.4
/*
 * Copyright (C) 2020 Graylog, Inc.
 *
 * This program is free software: you can redistribute it and/or modify
 * it under the terms of the Server Side Public License, version 1,
 * as published by MongoDB, Inc.
 *
 * This program is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
 * Server Side Public License for more details.
 *
 * You should have received a copy of the Server Side Public License
 * along with this program. If not, see
 * .
 */
package org.graylog2.cluster;

import com.fasterxml.jackson.annotation.JsonIgnore;
import com.fasterxml.jackson.annotation.JsonProperty;
import org.bson.types.BSONTimestamp;
import org.bson.types.ObjectId;
import org.graylog2.database.DbEntity;
import org.graylog2.database.PersistedImpl;
import org.graylog2.plugin.database.validators.Validator;
import org.graylog2.shared.utilities.StringUtils;
import org.joda.time.DateTime;
import org.joda.time.DateTimeZone;

import java.util.Collections;
import java.util.Locale;
import java.util.Map;

@DbEntity(collection = "nodes", titleField = "node_id")
public class NodeImpl extends PersistedImpl implements Node {

    public NodeImpl(Map fields) {
        super(fields);
    }

    public NodeImpl(ObjectId id, Map fields) {
        super(id, fields);
    }

    @Override
    public String getNodeId() {
        return (String) fields.get("node_id");
    }

    @Override
    @JsonProperty("is_leader")
    public boolean isLeader() {
        return (boolean) fields.get("is_leader");
    }

    @Override
    public String getTransportAddress() {
        return (String) fields.get("transport_address");
    }

    @Override
    public String getClusterAddress() {
        return (String) fields.get("cluster_address");
    }

    @Override
    public DateTime getLastSeen() {
        final Object rawLastSeen = fields.get("last_seen");
        if (rawLastSeen == null) {
            throw new IllegalStateException("Last seen timestamp of node is unexpectedly null!");
        }
        if (rawLastSeen instanceof BSONTimestamp) {
            return new DateTime(((BSONTimestamp) rawLastSeen).getTime() * 1000L, DateTimeZone.UTC);
        }
        return new DateTime(((Integer) rawLastSeen) * 1000L, DateTimeZone.UTC);
    }


    @Override
    public Type getType() {
        if (!fields.containsKey("type")) {
            return Type.SERVER;
        }

        return Type.valueOf(fields.get("type").toString().toUpperCase(Locale.ENGLISH));
    }

    @Override
    public String getHostname() {
        return (String)fields.get("hostname");
    }

    @Override
    @JsonIgnore
    public Map getValidations() {
        return Collections.emptyMap();
    }

    @Override
    @JsonIgnore
    public Map getEmbeddedValidations(String key) {
        return Collections.emptyMap();
    }

    @Override
    public String toString() {
        return getTitle();
    }
}