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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.recovery;

import static java.util.Objects.requireNonNull;
import static org.neo4j.kernel.database.DatabaseStartupController.NEVER_ABORT;

import org.neo4j.dbms.database.DatabaseStartAbortedException;
import org.neo4j.kernel.database.DatabaseStartupController;
import org.neo4j.kernel.database.NamedDatabaseId;

public class RecoveryStartupChecker {
    public static final RecoveryStartupChecker EMPTY_CHECKER = new NeverCanceledChecker();

    private final DatabaseStartupController databaseStartupController;
    private final NamedDatabaseId namedDatabaseId;

    public RecoveryStartupChecker(
            DatabaseStartupController databaseStartupController, NamedDatabaseId namedDatabaseId) {
        this.databaseStartupController = requireNonNull(databaseStartupController);
        this.namedDatabaseId = namedDatabaseId;
    }

    void checkIfCanceled() throws DatabaseStartAbortedException {
        if (databaseStartupController.shouldAbortStartup()) {
            throw new DatabaseStartAbortedException(namedDatabaseId);
        }
    }

    private static class NeverCanceledChecker extends RecoveryStartupChecker {
        private NeverCanceledChecker() {
            super(NEVER_ABORT, null);
        }

        @Override
        void checkIfCanceled() {}
    }
}