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Neo4j kernel is a lightweight, embedded Java database designed to store data structured as graphs rather than tables. For more information, see http://neo4j.org.

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/*
 * Copyright (c) "Neo4j"
 * Neo4j Sweden AB [https://neo4j.com]
 *
 * This file is part of Neo4j.
 *
 * Neo4j is free software: you can redistribute it and/or modify
 * it under the terms of the GNU General Public License as published by
 * the Free Software Foundation, either version 3 of the License, or
 * (at your option) any later version.
 *
 * 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
 * GNU General Public License for more details.
 *
 * You should have received a copy of the GNU General Public License
 * along with this program.  If not, see .
 */
package org.neo4j.kernel.api.net;

import static java.util.Collections.emptyList;

import java.util.List;

/**
 * Container for all established and active network connections to the database.
 */
public interface NetworkConnectionTracker {
    String newConnectionId(String connector);

    void add(TrackedNetworkConnection connection);

    void remove(TrackedNetworkConnection connection);

    TrackedNetworkConnection get(String id);

    List activeConnections();

    NetworkConnectionTracker NO_OP = new NetworkConnectionTracker() {
        private final NetworkConnectionIdGenerator idGenerator = new NetworkConnectionIdGenerator();

        @Override
        public String newConnectionId(String connector) {
            // need to generate a valid ID because it appears in logs, bolt messages, etc.
            return idGenerator.newConnectionId(connector);
        }

        @Override
        public void add(TrackedNetworkConnection connection) {}

        @Override
        public void remove(TrackedNetworkConnection connection) {}

        @Override
        public TrackedNetworkConnection get(String id) {
            return null;
        }

        @Override
        public List activeConnections() {
            return emptyList();
        }
    };
}