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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 [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 .
 */
package org.neo4j.kernel.impl.transaction.tracing;

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

public interface DatabaseTracer extends TransactionTracer, CheckPointTracer
{
    DatabaseTracer NULL = new DatabaseTracer()
    {
        @Override
        public long numberOfCheckPoints()
        {
            return 0;
        }

        @Override
        public long checkPointAccumulatedTotalTimeMillis()
        {
            return 0;
        }

        @Override
        public long lastCheckpointTimeMillis()
        {
            return 0;
        }

        @Override
        public LogFileCreateEvent createLogFile()
        {
            return LogFileCreateEvent.NULL;
        }

        @Override
        public LogAppendEvent logAppend()
        {
            return LogAppendEvent.NULL;
        }

        @Override
        public LogFileFlushEvent flushFile()
        {
            return LogFileFlushEvent.NULL;
        }

        @Override
        public LogCheckPointEvent beginCheckPoint()
        {
            return LogCheckPointEvent.NULL;
        }

        @Override
        public TransactionEvent beginTransaction( CursorContext cursorContext )
        {
            return TransactionEvent.NULL;
        }

        @Override
        public long appendedBytes()
        {
            return 0;
        }

        @Override
        public long numberOfLogRotations()
        {
            return 0;
        }

        @Override
        public long logRotationAccumulatedTotalTimeMillis()
        {
            return 0;
        }

        @Override
        public long lastLogRotationTimeMillis()
        {
            return 0;
        }

        @Override
        public long numberOfFlushes()
        {
            return 0;
        }

        @Override
        public long lastTransactionLogAppendBatch()
        {
            return 0;
        }
    };

    LogFileCreateEvent createLogFile();

    LogAppendEvent logAppend();

    LogFileFlushEvent flushFile();
}