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  * JBoss, Home of Professional Open Source
  * Copyright 2006, Red Hat Middleware LLC, and individual contributors 
  * as indicated by the @author tags. 
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  * full listing of individual contributors. 
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  * of the GNU Lesser General Public License, v. 2.1.
 * This program is distributed in the hope that it will be useful, but WITHOUT A 
 * 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,
 * v.2.1 along with this distribution; if not, write to the Free Software
 * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, 
 * MA  02110-1301, USA.
 * (C) 2005-2006,
 * @author JBoss Inc.
 * Copyright (C) 1999-2001 by HP Bluestone Software, Inc. All rights Reserved.
 * HP Arjuna Labs,
 * Newcastle upon Tyne,
 * Tyne and Wear,
 * UK.
 * $Id: 2342 2006-03-30 13:06:17Z  $
package com.arjuna.ats.arjuna.recovery ;

Interface for Expiry scanner plug-ins. ExpiryScanners check for ancient entries in the ObjectStore (or elsewhere) to avoid leaving long-dead and irrelevant entries lying around for ever. The scan() method of each registered ExpiryScanner implementation is called by the RecoveryManager at an interval expiryScanInterval (hours).
public interface ExpiryScanner
perform a scan
   public void scan() ;

Is this scanner to be used. (E.g. if zero age means "don't remove", and it has been set to zero, toBeUsed replies false)
   public boolean toBeUsed() ;
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