package uws.job;
/*
* This file is part of UWSLibrary.
*
* UWSLibrary is free software: you can redistribute it and/or modify
* it under the terms of the GNU Lesser General Public License as published by
* the Free Software Foundation, either version 3 of the License, or
* (at your option) any later version.
*
* UWSLibrary 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 UWSLibrary. If not, see <http://www.gnu.org/licenses/>.
*
* Copyright 2012 - UDS/Centre de Données astronomiques de Strasbourg (CDS)
*/
import java.io.Serializable;
import uws.UWSException;
/**
* Any object which wants to follow the progression of any instance of {@link UWSJob}.
* It will be notified at each execution phase transition of the observer job.
*
* @author Grégory Mantelet (CDS)
* @version 05/2012
*
* @see UWSJob
* @see UWSJob#addObserver(JobObserver)
*/
public interface JobObserver extends Serializable {
/**
* Used when one of the observed jobs notifies its observers of a modification of its execution phase.
*
* @param job The observed jobs which notifies the observer.
* @param oldPhase The job phase before its modification.
* @param newPhase The job phase after its modification (the same value as {@link UWSJob#getPhase()}).
*
* @throws UWSException If there is an error during the call of this method.
*/
public void update(UWSJob job, ExecutionPhase oldPhase, ExecutionPhase newPhase) throws UWSException;
}