trunk/workflowmodel-api/src/main/java/net/sf/taverna/t2/workflowmodel/DataflowOutputPort.java

/*******************************************************************************
 * Copyright (C) 2007 The University of Manchester   
 * 
 *  Modifications to the initial code base are copyright of their
 *  respective authors, or their employers as appropriate.
 * 
 *  This program 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 2.1 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
 *  Lesser General Public License for more details.
 *    
 *  You should have received a copy of the GNU Lesser General Public
 *  License along with this program; if not, write to the Free Software
 *  Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307
 ******************************************************************************/
package net.sf.taverna.t2.workflowmodel;

import net.sf.taverna.t2.facade.ResultListener;

/**
 * Output port of a DataFlow, exposes an internal EventHandlingInputPort into
 * which the internal workflow logic pushes data to be exposed outside the
 * workflow boundary.
 * 
 * @author Tom Oinn
 * 
 */
public interface DataflowOutputPort extends EventForwardingOutputPort, DataflowPort {

	/**
	 * Get the internal input port for this workflow output
	 * 
	 * @return port into which the workflow can push data for this output
	 */
	public EventHandlingInputPort getInternalInputPort();
	
	/**
	 * Add a ResultListener, capable of listening to results being received by the output port
	 * @param listener the ResultListener
	 * 
	 * @see ResultListener
	 */
	public void addResultListener(ResultListener listener);
	
	/**
	 * Remove a ResultListener
	 * @param listener the ResultListener
	 * 
	 * @see ResultListener
	 */
	public void removeResultListener(ResultListener listener);

}