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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.impl.api;

import java.util.Set;
import org.neo4j.kernel.api.KernelTransactionHandle;

public interface TransactionRegistry {
    /**
     * Give an approximate set of all transactions currently executing. In contrast to {@link #activeTransactions}, this also includes transactions in the
     * closing state, e.g. committing or rolling back. This is not guaranteed to be exact, as transactions may stop and start while this set is gathered.
     *
     * @return the (approximate) set of executing transactions.
     */
    Set executingTransactions();

    /**
     * Give an approximate set of all transactions currently running.
     * This is not guaranteed to be exact, as transactions may stop and start while this set is gathered.
     *
     * @return the (approximate) set of open transactions.
     */
    Set activeTransactions();

    /**
     * Signal all transactions to terminate
     */
    void terminateTransactions();

    /**
     * Checks whether any transactions are in closing state
     */
    boolean haveClosingTransaction();
}