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/*
 * Bitronix Transaction Manager
 *
 * Copyright (c) 2010, Bitronix Software.
 *
 * This copyrighted material is made available to anyone wishing to use, modify,
 * copy, or redistribute it subject to the terms and conditions of the GNU
 * Lesser General Public License, as published by the Free Software Foundation.
 *
 * 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 Lesser General Public License
 * for more details.
 *
 * You should have received a copy of the GNU Lesser General Public License
 * along with this distribution; if not, write to:
 * Free Software Foundation, Inc.
 * 51 Franklin Street, Fifth Floor
 * Boston, MA 02110-1301 USA
 */
package bitronix.tm.journal;

import bitronix.tm.utils.Uid;

import java.io.IOException;
import java.util.Collections;
import java.util.Map;
import java.util.Set;


/**
 * No-op journal. Do not use for anything else than testing as the transaction manager cannot guarantee
 * data integrity with this journal implementation.
 *
 * @author lorban
 */
public class NullJournal implements Journal {

    public NullJournal() {
    }

    public void log(int status, Uid gtrid, Set uniqueNames) throws IOException {
    }

    public void open() throws IOException {
    }

    public void close() throws IOException {
    }

    public void force() throws IOException {
    }

    public Map collectDanglingRecords() throws IOException {
        return Collections.emptyMap();
    }

    public void shutdown() {
    }

    public String toString() {
        return "a NullJournal";
    }
}