Hibernate Custom Type to use @Version optimistic locking for SQLServer datetime fields that are limited by 1/300th of a second precision

SqlServerTimestampType.java

public class SqlServerTimestampType extends TimestampType {
    private static final int SQLSERVER_PRECISION = 10;

    public SqlServerTimestampType() {
        super();
    }

    /**
     * SQLServer datetime fields are accurate to 1/300th of a second.
     * We floor to the nearest 1/100th of a second for simplicity.
     * @see http://msdn.microsoft.com/en-us/library/aa258277%28SQL.80%29.aspx
     */
    @Override
    public Date seed(SessionImplementor session) {
        return new Timestamp( roundToSqlServerPrecision(System.currentTimeMillis()) );
    }

    /**
     * This will floor a long value to the nearest 10th place
     * @param value to floor to closest 10
     * @return long floored to closest 10
     */
    public long roundToSqlServerPrecision(long value)
    {
        return (value / SQLSERVER_PRECISION) * SQLSERVER_PRECISION;
    }
}