/*
 * Copyright (c) "Neo4j"
 * Neo4j Sweden AB [http://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 <http://www.gnu.org/licenses/>.
 */
package org.neo4j.internal.id;

import org.neo4j.io.pagecache.context.CursorContext;

/**
 * {@link IdSequence} w/o any synchronization, purely a long incrementing.
 */
public class BatchingIdSequence implements IdSequence {
    private final long startId;
    private long nextId;

    public BatchingIdSequence() {
        this(0);
    }

    public BatchingIdSequence(long startId) {
        this.startId = startId;
        this.nextId = startId;
    }

    @Override
    public long nextId(CursorContext ignored) {
        long result = peek();
        nextId++;
        return result;
    }

    public void reset() {
        nextId = startId;
    }

    public void set(long nextId) {
        this.nextId = nextId;
    }

    public long peek() {
        if (IdValidator.isReservedId(nextId)) {
            nextId++;
        }
        return nextId;
    }
}
