outage.java

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//
// This file is part of the OpenNMS(R) Application.
//
// OpenNMS(R) is Copyright (C) 2002-2003 The OpenNMS Group, Inc.  All rights reserved.
// OpenNMS(R) is a derivative work, containing both original code, included code and modified
// code that was published under the GNU General Public License. Copyrights for modified 
// and included code are below.
//
// OpenNMS(R) is a registered trademark of The OpenNMS Group, Inc.
//
// Copyright (C) 1999-2001 Oculan Corp.  All rights reserved.
//
// This program is free software; you can redistribute it and/or modify
// it under the terms of the GNU General Public License as published by
// the Free Software Foundation; either version 2 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 General Public License for more details.
//
// You should have received a copy of the GNU 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, USA.
//
// For more information contact:
//      OpenNMS Licensing       <[e-mail]>
//      http://www.opennms.org/
//      http://www.opennms.com/
//
// Tab Size = 8
//

package org.opennms.report.datablock;

import org.apache.log4j.Category;
import org.opennms.core.utils.ThreadCategory;

/**
 * This class holds the service lost and regained time pair for the
 * node/ipaddr/service combination.
 * 
 * @author <A HREF="mailto:[e-mail]">Jacinta Remedios </A>
 * @author <A HREF="http://www.oculan.com">Oculan Corp </A>
 * 
 */
public class Outage extends Object {
    /**
     * The log4j category used to log debug messsages and statements.
     */
    private static final String LOG4J_CATEGORY = "OpenNMS.Report";

    /**
     * Time at which the service was lost.
     */
    private long m_svcLostTime; // in milliseconds.

    /**
     * Time at which service was regained.
     */
    private long m_svcRegainedTime; // in milliseconds.

    /**
     * Default Constructor.
     */
    public Outage() {
        m_svcLostTime = -1;
        m_svcRegainedTime = -1;
    }

    /**
     * Constructor that sets the lost time.
     * 
     * @param svcLost
     *            Time at which the service is lost.
     */
    public Outage(long svcLost) {
        m_svcLostTime = svcLost;
        m_svcRegainedTime = -1;
    }

    /**
     * Constructor that sets the service lost and regained times.
     * 
     * @param svcLost
     *            Time at which the service is lost.
     * @param svcRegained
     *            Time at which the service is regained.
     */
    public Outage(long svcLost, long svcRegained) {
        m_svcLostTime = svcLost;
        m_svcRegainedTime = svcRegained;
    }

    /**
     * Set the Lost time
     * 
     * @param losttime
     *            Time at which the service is lost.
     */
    public void setLostTime(long losttime) {
        m_svcLostTime = losttime;
    }

    /**
     * Set the regained time.
     * 
     * @param regainedtime
     *            Time at which the service is regained.
     */
    public void setRegainedTime(long regainedtime) {
        m_svcRegainedTime = regainedtime;
    }

    /**
     * Return the service lost time
     * 
     * @return the service lost time.
     */
    public long getLostTime() {
        return m_svcLostTime;
    }

    /**
     * Return the regained time
     * 
     * @return the service regained time.
     */
    public long getRegainedTime() {
        return m_svcRegainedTime;
    }

    /**
     * Return the downtime (difference between the regained and lost times) in
     * the last rolling window
     * 
     * @param curTime
     *            Time denoting end of rolling window (milliseconds).
     * @param rollingWindow
     *            Rolling Window (milliseconds)
     * 
     * @return the downtime (difference between the regained and lost times) in
     *         the last rolling window
     */
    public long getDownTime(long curTime, long rollingWindow) {
        ThreadCategory.setPrefix(LOG4J_CATEGORY);
        Category log = ThreadCategory.getInstance(this.getClass());
        long downTime = 0;
        boolean flag = false;

        // make sure the losttime is greater than current time.
        if (curTime < m_svcLostTime) {
            // if(log.isDebugEnabled())
            // log.debug("Downtime " + downTime);
            return downTime;
        }

        // the start of the rolling window
        long startTime = curTime - rollingWindow;

        if (m_svcRegainedTime == -1) {
            // node yet to regain service
            if (m_svcLostTime < startTime) {
                // if svclosttime is less than the rolling window
                // means its been down throughout
                downTime = rollingWindow;
            } else {
                downTime = curTime - m_svcLostTime;
            }
        } else {
            if (m_svcLostTime >= startTime) {
                if (m_svcRegainedTime < curTime) {
                    downTime = m_svcRegainedTime - m_svcLostTime;
                } else {
                    downTime = curTime - m_svcLostTime;
                }
            } else {
                if (m_svcRegainedTime < startTime) // Doesnt lie within rolling
                                                    // window.
                {
                    return 0;
                    // downTime = m_svcRegainedTime - startTime;
                } else {
                    if (m_svcRegainedTime > curTime) {
                        downTime = rollingWindow;
                    } else {
                        downTime = m_svcRegainedTime - startTime;
                    }
                }
            }
        }
        // if(log.isDebugEnabled())
        // log.debug("Downtime " + downTime);
        return downTime;
    }

    /**
     * Returns the outage information in date format.
     */
    public String toString() {
        StringBuffer retVal = new StringBuffer();
        retVal.append(" Lost service ").append(new java.util.Date(m_svcLostTime));
        retVal.append(" Regained service ").append(new java.util.Date(m_svcRegainedTime) + "\n");
        return retVal.toString();
    }
}