/*
 * This file is part of the Alitheia system, developed by the SQO-OSS
 * consortium as part of the IST FP6 SQO-OSS project, number 033331.
 *
 * Copyright 2008 - 2010 - Organization for Free and Open Source Software,  
 *                 Athens, Greece.
 *
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions are
 * met:
 *
 *     * Redistributions of source code must retain the above copyright
 *       notice, this list of conditions and the following disclaimer.
 *
 *     * Redistributions in binary form must reproduce the above
 *       copyright notice, this list of conditions and the following
 *       disclaimer in the documentation and/or other materials provided
 *       with the distribution.
 *
 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
 * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
 * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
 * A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
 * OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
 * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
 * LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
 * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
 * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
 * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
 *
 */

package eu.sqooss.service.abstractmetric;

/**
 * Thrown when a DAO is locked for processing by another metric plugin.
 * Metrics cannot lock a DAO object; this happens automatically on
 * entering the metric result calculation code in AbstractMetric to ensure
 * that no two instances of the metric operate on the same DAO (this happens
 * often when a metric starts the calculation of another metric as a result
 * of a metric dependency association). To ensure that a metric transaction
 * actually sees the results of the calculation of the other metric working
 * on the same DAO, this exception is thrown.
 */
public class AlreadyProcessingException extends Exception {
    
    private static final long serialVersionUID = 1L;

    AlreadyProcessingException() {
        super();
    }
}
