RecoveryModule.java

/*
 * JBoss, Home of Professional Open Source
 * Copyright 2006, Red Hat Middleware LLC, and individual contributors 
 * as indicated by the @author tags. 
 * See the copyright.txt in the distribution for a
 * full listing of individual contributors. 
 * This copyrighted material is made available to anyone wishing to use,
 * modify, copy, or redistribute it subject to the terms and conditions
 * 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: RecoveryModule.java 2342 2006-03-30 13:06:17Z  $
 */

package com.arjuna.ats.arjuna.recovery ;

/**
 * Interface for Recovery manager plug-in module.
 * RecoveryModules are registered via the properties mechanisms.
 * The periodicWorkFirstPass of each module is called, then RecoveryManager
 * waits for the time interval RECOVERY_BACKOFF_PERIOD (seconds), then the
 * periodicWorkSecondPass of each module are called.
 * The RecoveryManager then waits for period PERIODIC_RECOVERY_PERIOD (seconds)
 * before starting the first pass again
 * The backoff period between the first and second pass is intended to allow
 * transactions that were in-flight during the first pass to be completed normally,
 * without requiring the status of each one to be checked. The recovery period 
 * will typically be appreciably longer.
 */

public interface RecoveryModule
{
    /**
     * Called by the RecoveryManager at start up, and then
     * PERIODIC_RECOVERY_PERIOD seconds after the completion, for all RecoveryModules,
     * of the second pass
     */

    public void periodicWorkFirstPass ();
    
    /**
     * Called by the RecoveryManager RECOVERY_BACKOFF_PERIOD seconds
     * after the completion of the first pass
     */

    public void periodicWorkSecondPass ();
}