OrderableTransaction.java

/* This file is part of VoltDB.
 * Copyright (C) 2008-2017 VoltDB Inc.
 *
 * This program is free software: you can redistribute it and/or modify
 * it under the terms of the GNU Affero 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 Affero General Public License for more details.
 *
 * You should have received a copy of the GNU Affero General Public License
 * along with VoltDB.  If not, see <http://www.gnu.org/licenses/>.
 */
package org.voltdb.dtxn;

public abstract class OrderableTransaction implements Comparable<OrderableTransaction> {
    public final long txnId;
    /*
     * An pre-IV2ish transaction ID like thing generated by the master or MP coordinator
     * that has a timestamp in the most significant bits
     *
     * It is used to specify a time for a transaction as well as provide a unique value
     */
    public final long uniqueId;
    public final long initiatorHSId;

    public OrderableTransaction(final long txnId, final long uniqueId, final long initiatorHSId) {
        this.txnId = txnId;
        this.uniqueId = uniqueId;
        this.initiatorHSId = initiatorHSId;
    }

    @Override
    public int compareTo(OrderableTransaction o) {
        long x = o.txnId - txnId;
        if (x < 0) return 1;
        if (x > 0) return -1;
        return 0;
    }

    public boolean isDurable() {
        return false;
    }
}