client/monitors/Swap__Monitor.java

/* 
 * i-scream central monitoring system
 * http://www.i-scream.org.uk
 * Copyright (C) 2000-2002 i-scream
 * 
 * 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.
 */

//---PACKAGE DECLARATION---
package uk.org.iscream.cms.server.client.monitors;

//---IMPORTS---
import java.util.HashMap;
import java.text.NumberFormat;
import uk.org.iscream.cms.server.client.*;
import uk.org.iscream.cms.server.core.*;
import uk.org.iscream.cms.util.*;
import uk.org.iscream.cms.server.componentmanager.*;

/**
 * This Monitor watches the Swap for all machines
 *
 * @author  $Author: tdb $
 * @version $Id: Swap__Monitor.java,v 1.11 2003/02/05 16:43:46 tdb Exp $
 */
public class Swap__Monitor extends MonitorSkeleton {

//---FINAL ATTRIBUTES---

    /**
     * The current CVS revision of this class
     */
    public final String REVISION = "$Revision: 1.11 $";
    
    /**
     * A description of this monitor
     */
    public final String DESC = "Monitors Swap.";
    
//---STATIC METHODS---

//---CONSTRUCTORS---

//---PUBLIC METHODS---
    
    /**
     * Analyse a packet of data, and generate an alert if
     * necessary.
     *
     * @param packet the XMLPacket to analyse
     */
    public void analysePacket(XMLPacket packet) {
        String source = packet.getParam("packet.attributes.machine_name");
        if (!_hosts.containsKey(source)) {
            _hosts.put(source, new Register(source, _name));
        }

        Register reg = (Register) _hosts.get(source);

        // get the packet data
        double swapTotal, swapFree;
        try {
            String total = packet.getParam("packet.swap.total");
            String free = packet.getParam("packet.swap.free");
            if(total==null || free==null) {
                throw new NumberFormatException("Swap data invalid");
            }
            swapTotal = Double.parseDouble(total);
            swapFree = Double.parseDouble(free);
        } catch (NumberFormatException e) {
            _logger.write(this.toString(), Logger.WARNING, "Received packet from "+source+" with bad swap information: "+e);
            // don't try to continue and process
            return;
        }

        boolean useValue = false;
        try {
           String option = _cp.getProperty("Host." + source, "Monitor." + _name + ".thresholdMeasure");
           if (option.equals("VALUE")) {
               useValue = true;
           }
        } catch (PropertyNotFoundException e) {
            // we default to percentage
        }

        // this bit determines if the swap check is a % check
        // or a byte check
        String type;
        double curValue;
        int newThreshold;
        if(useValue) {
            // bytes of swap available
            curValue = swapFree;
            // negate check
            newThreshold = checkAttributeThreshold(curValue, reg, true);
            type = "bytes";
        } else {
            // % memory in use
            curValue = (1 - ((double)swapFree / (double)swapTotal)) * 100;
            // normal check
            newThreshold = checkAttributeThreshold(curValue, reg, false);
            type = "%";
        }

        // format the value to a String
        NumberFormat nf = NumberFormat.getInstance();
        nf.setMaximumFractionDigits(2);
        nf.setMinimumFractionDigits(2);
        String strSwapInUse = nf.format(swapInUse);

        String attributeName = "Swap in use " + type;

        processAlert(newThreshold, attributeName, reg, source, strSwapInUse);
            
    }

    /**
     * Overrides the {@link java.lang.Object#toString() Object.toString()}
     * method to provide clean logging (every class should have this).
     *
     * This uses the uk.org.iscream.cms.util.NameFormat class
     * to format the toString()
     *
     * @return the name of this class and its CVS revision
     */
    public String toString() {
        return FormatName.getName(
            _name,
            getClass().getName(),
            REVISION);
    }

    /**
     * return the String representation of what the monitor does
     */
    public String getDescription(){
        return DESC;
    }

//---PRIVATE METHODS---
    
    /**
     * Checks a piece of current data, and returns the
     * threshold it breaches, if any.
     *
     * The option to negate the check can be used in
     * situations where being *below* the threshold
     * is an 'alertable' situation. In this specific
     * case, we'd do this with kb disk checks.
     *
     * @param value the current value
     * @param reg the Register for the host
     * @param negateCheck whether to negate the check
     * @return the threshold level breached, if any
     */
    private int checkAttributeThreshold(double value, Register reg, boolean negateCheck) {
        for(int thresholdLevel = Alert.thresholdLevels.length - 1; thresholdLevel >= 0; thresholdLevel--) {
            if (reg.getThreshold(thresholdLevel) != -1.0) {
                if(!negateCheck) {
                    // normal check - has the value gone *over* the threshold
                    if(((double) reg.getThreshold(thresholdLevel)) < value) {
                        return thresholdLevel;
                    }
                }
                else {
                    // negated check - has the value gone *under* the threshold
                    if(((double) reg.getThreshold(thresholdLevel)) > value) {
                        return thresholdLevel;
                    }
                }
            }
        }
        return Alert.thresholdNORMAL;
    }

//---ACCESSOR/MUTATOR METHODS---
    
    /**
     * Returns a reference to a specific Queue for this
     * monitor. This Queue returns only the data packets
     * (based on type) that we want too look at.
     *
     * @return a reference to a Queue
     */
    protected Queue getQueue() {
        return MonitorManager.getInstance().getDataQueue();
    }


//---ATTRIBUTES---

    /**
     * This is the friendly identifier of the
     * component this class is running in.
     * eg, a Filter may be called "filter1",
     * If this class does not have an owning
     * component,  a name from the configuration
     * can be placed here.  This name could also
     * be changed to null for utility classes.
     */
    private String _name = "Swap";
    
    /**
     * A HashMap of Registers (or groups of Registers), one
     * for each host we're monitoring.
     */
    private HashMap _hosts = new HashMap();

//---STATIC ATTRIBUTES---

}
Revision:	1.12
Committed:	Mon Mar 10 08:59:19 2003 UTC (21 years, 2 months ago) by tdb
Branch:	MAIN
Changes since 1.11:	+53 -14 lines
Log Message:	This brings the Swap monitor up-to-date with the Memory monitor.
#	User	Rev	Content
1	tdb	1.9	/*
2			* i-scream central monitoring system
3	tdb	1.10	* http://www.i-scream.org.uk
4	tdb	1.9	* Copyright (C) 2000-2002 i-scream
5			*
6			* This program is free software; you can redistribute it and/or
7			* modify it under the terms of the GNU General Public License
8			* as published by the Free Software Foundation; either version 2
9			* of the License, or (at your option) any later version.
10			*
11			* This program is distributed in the hope that it will be useful,
12			* but WITHOUT ANY WARRANTY; without even the implied warranty of
13			* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
14			* GNU General Public License for more details.
15			*
16			* You should have received a copy of the GNU General Public License
17			* along with this program; if not, write to the Free Software
18			* Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
19			*/
20
21	tdb	1.1	//---PACKAGE DECLARATION---
22	tdb	1.7	package uk.org.iscream.cms.server.client.monitors;
23	tdb	1.1
24			//---IMPORTS---
25			import java.util.HashMap;
26	tdb	1.2	import java.text.NumberFormat;
27	tdb	1.7	import uk.org.iscream.cms.server.client.*;
28			import uk.org.iscream.cms.server.core.*;
29	tdb	1.11	import uk.org.iscream.cms.util.*;
30	tdb	1.7	import uk.org.iscream.cms.server.componentmanager.*;
31	tdb	1.1
32			/**
33			* This Monitor watches the Swap for all machines
34			*
35	tdb	1.8	* @author $Author: tdb $
36	tdb	1.12	* @version $Id: Swap__Monitor.java,v 1.11 2003/02/05 16:43:46 tdb Exp $
37	tdb	1.1	*/
38			public class Swap__Monitor extends MonitorSkeleton {
39
40			//---FINAL ATTRIBUTES---
41
42			/**
43			* The current CVS revision of this class
44			*/
45	tdb	1.12	public final String REVISION = "$Revision: 1.11 $";
46	tdb	1.1
47	tdb	1.6	/**
48			* A description of this monitor
49			*/
50	tdb	1.1	public final String DESC = "Monitors Swap.";
51
52			//---STATIC METHODS---
53
54			//---CONSTRUCTORS---
55
56			//---PUBLIC METHODS---
57	tdb	1.6
58			/**
59			* Analyse a packet of data, and generate an alert if
60			* necessary.
61			*
62			* @param packet the XMLPacket to analyse
63			*/
64	tdb	1.1	public void analysePacket(XMLPacket packet) {
65	ajm	1.5	String source = packet.getParam("packet.attributes.machine_name");
66			if (!_hosts.containsKey(source)) {
67			_hosts.put(source, new Register(source, _name));
68			}
69
70			Register reg = (Register) _hosts.get(source);
71
72			// get the packet data
73			double swapTotal, swapFree;
74			try {
75			String total = packet.getParam("packet.swap.total");
76			String free = packet.getParam("packet.swap.free");
77			if(total==null \|\| free==null) {
78	tdb	1.12	throw new NumberFormatException("Swap data invalid");
79	tdb	1.1	}
80	ajm	1.5	swapTotal = Double.parseDouble(total);
81			swapFree = Double.parseDouble(free);
82			} catch (NumberFormatException e) {
83	tdb	1.8	_logger.write(this.toString(), Logger.WARNING, "Received packet from "+source+" with bad swap information: "+e);
84	ajm	1.5	// don't try to continue and process
85			return;
86			}
87
88	tdb	1.12	boolean useValue = false;
89			try {
90			String option = _cp.getProperty("Host." + source, "Monitor." + _name + ".thresholdMeasure");
91			if (option.equals("VALUE")) {
92			useValue = true;
93			}
94			} catch (PropertyNotFoundException e) {
95			// we default to percentage
96			}
97	ajm	1.5
98	tdb	1.12	// this bit determines if the swap check is a % check
99			// or a byte check
100			String type;
101			double curValue;
102			int newThreshold;
103			if(useValue) {
104			// bytes of swap available
105			curValue = swapFree;
106			// negate check
107			newThreshold = checkAttributeThreshold(curValue, reg, true);
108			type = "bytes";
109			} else {
110			// % memory in use
111			curValue = (1 - ((double)swapFree / (double)swapTotal)) * 100;
112			// normal check
113			newThreshold = checkAttributeThreshold(curValue, reg, false);
114			type = "%";
115			}
116
117			// format the value to a String
118	ajm	1.5	NumberFormat nf = NumberFormat.getInstance();
119			nf.setMaximumFractionDigits(2);
120			nf.setMinimumFractionDigits(2);
121			String strSwapInUse = nf.format(swapInUse);
122
123	tdb	1.12	String attributeName = "Swap in use " + type;
124
125	ajm	1.5	processAlert(newThreshold, attributeName, reg, source, strSwapInUse);
126	tdb	1.1
127			}
128
129			/**
130			* Overrides the {@link java.lang.Object#toString() Object.toString()}
131			* method to provide clean logging (every class should have this).
132			*
133	tdb	1.11	* This uses the uk.org.iscream.cms.util.NameFormat class
134	tdb	1.1	* to format the toString()
135			*
136			* @return the name of this class and its CVS revision
137			*/
138			public String toString() {
139			return FormatName.getName(
140			_name,
141			getClass().getName(),
142			REVISION);
143			}
144
145			/**
146			* return the String representation of what the monitor does
147			*/
148			public String getDescription(){
149			return DESC;
150			}
151
152			//---PRIVATE METHODS---
153	tdb	1.6
154			/**
155			* Checks a piece of current data, and returns the
156			* threshold it breaches, if any.
157			*
158	tdb	1.12	* The option to negate the check can be used in
159			* situations where being below the threshold
160			* is an 'alertable' situation. In this specific
161			* case, we'd do this with kb disk checks.
162			*
163			* @param value the current value
164	tdb	1.6	* @param reg the Register for the host
165	tdb	1.12	* @param negateCheck whether to negate the check
166	tdb	1.6	* @return the threshold level breached, if any
167			*/
168	tdb	1.12	private int checkAttributeThreshold(double value, Register reg, boolean negateCheck) {
169	tdb	1.1	for(int thresholdLevel = Alert.thresholdLevels.length - 1; thresholdLevel >= 0; thresholdLevel--) {
170			if (reg.getThreshold(thresholdLevel) != -1.0) {
171	tdb	1.12	if(!negateCheck) {
172			// normal check - has the value gone over the threshold
173			if(((double) reg.getThreshold(thresholdLevel)) < value) {
174			return thresholdLevel;
175			}
176			}
177			else {
178			// negated check - has the value gone under the threshold
179			if(((double) reg.getThreshold(thresholdLevel)) > value) {
180			return thresholdLevel;
181			}
182	tdb	1.1	}
183			}
184			}
185			return Alert.thresholdNORMAL;
186			}
187
188			//---ACCESSOR/MUTATOR METHODS---
189	tdb	1.6
190			/**
191			* Returns a reference to a specific Queue for this
192			* monitor. This Queue returns only the data packets
193			* (based on type) that we want too look at.
194			*
195			* @return a reference to a Queue
196			*/
197	ajm	1.5	protected Queue getQueue() {
198			return MonitorManager.getInstance().getDataQueue();
199			}
200
201	tdb	1.1
202			//---ATTRIBUTES---
203
204			/**
205			* This is the friendly identifier of the
206			* component this class is running in.
207			* eg, a Filter may be called "filter1",
208			* If this class does not have an owning
209			* component, a name from the configuration
210			* can be placed here. This name could also
211			* be changed to null for utility classes.
212			*/
213			private String _name = "Swap";
214
215			/**
216	tdb	1.6	* A HashMap of Registers (or groups of Registers), one
217			* for each host we're monitoring.
218	tdb	1.1	*/
219			private HashMap _hosts = new HashMap();
220
221			//---STATIC ATTRIBUTES---
222
223			}