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/* |
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* i-scream central monitoring system |
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* http://www.i-scream.org.uk |
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* Copyright (C) 2000-2002 i-scream |
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* |
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* This program is free software; you can redistribute it and/or |
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* modify it under the terms of the GNU General Public License |
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* as published by the Free Software Foundation; either version 2 |
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* of the License, or (at your option) any later version. |
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* |
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* This program is distributed in the hope that it will be useful, |
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* but WITHOUT ANY WARRANTY; without even the implied warranty of |
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the |
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* GNU General Public License for more details. |
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* |
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* You should have received a copy of the GNU General Public License |
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* along with this program; if not, write to the Free Software |
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* Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA. |
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*/ |
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|
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//---PACKAGE DECLARATION--- |
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package uk.org.iscream.client.monitors; |
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package uk.org.iscream.cms.server.client.monitors; |
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//---IMPORTS--- |
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import java.util.HashMap; |
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import java.text.NumberFormat; |
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import uk.org.iscream.client.*; |
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import uk.org.iscream.core.*; |
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import uk.org.iscream.util.*; |
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import uk.org.iscream.componentmanager.*; |
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import uk.org.iscream.cms.server.client.*; |
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import uk.org.iscream.cms.server.core.*; |
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import uk.org.iscream.cms.util.*; |
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import uk.org.iscream.cms.server.componentmanager.*; |
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/** |
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* This Monitor watches the Memory for all machines |
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*/ |
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public final String REVISION = "$Revision$"; |
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/** |
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* A description of this monitor |
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*/ |
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public final String DESC = "Monitors Memory."; |
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//---STATIC METHODS--- |
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//---CONSTRUCTORS--- |
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//---PUBLIC METHODS--- |
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/** |
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* Analyse a packet of data, and generate an alert if |
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* necessary. |
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* |
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* @param packet the XMLPacket to analyse |
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*/ |
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public void analysePacket(XMLPacket packet) { |
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String source = packet.getParam("packet.attributes.machine_name"); |
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if (!_hosts.containsKey(source)) { |
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Register reg = (Register) _hosts.get(source); |
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// find out the threshold level we're at |
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String attributeName = "Memory In Use %"; |
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// get the packet data |
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double memoryTotal, memoryFree; |
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double memoryTotal, memoryFree, memoryCache; |
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try { |
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String total = packet.getParam("packet.memory.total"); |
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String free = packet.getParam("packet.memory.free"); |
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if(total==null || free==null) { |
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throw new NumberFormatException("Memory data invalid"); |
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throw new NumberFormatException("Memory data invalid or not supplied"); |
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} |
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memoryTotal = Double.parseDouble(total); |
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memoryFree = Double.parseDouble(free); |
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// get hold of the cache data.. default to 0 |
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memoryCache = 0.0; |
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String cache = packet.getParam("packet.memory.cache"); |
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if(cache != null) { |
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memoryCache = Double.parseDouble(cache); |
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} |
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} catch (NumberFormatException e) { |
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_logger.write(this.toString(), Logger.WARNING, "Received packet from "+source+" with bad memory information: "+e); |
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// don't try to continue and process |
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String option = _cp.getProperty("Host." + source, "Monitor." + _name + ".thresholdMeasure"); |
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if (option.equals("VALUE")) { |
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useValue = true; |
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} |
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} |
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} catch (PropertyNotFoundException e) { |
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// we default to percentage |
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} |
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boolean useCache = false; |
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try { |
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int useCacheAsFree = Integer.parseInt(_cp.getProperty("Host." + source, "Monitor." + _name + ".useCacheAsFree")); |
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useCache = (useCacheAsFree == 1); |
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} catch (PropertyNotFoundException e) { |
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// we default to false |
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} catch (NumberFormatException e) { |
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// we default to false |
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} |
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|
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// this bit determines if the memory check is a % check |
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// or a kb check |
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double memoryInUse; |
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String type; |
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double curValue; |
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int newThreshold; |
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if(useValue) { |
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// kb memory in use |
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memoryInUse = memoryTotal - memoryFree; |
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// kb memory available |
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if(useCache) { |
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// NOTE: we take cache as being "probably free" for this check |
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curValue = memoryFree + memoryCache; |
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} else { |
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curValue = memoryFree; |
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} |
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// negate check |
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newThreshold = checkAttributeThreshold(curValue, reg, true); |
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type = "kb"; |
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} else { |
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// % memory in use |
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memoryInUse = (1-(memoryFree / memoryTotal)) * 100; |
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if(useCache) { |
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// NOTE: we take cache as being "probably free" for this check |
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curValue = (1 - ((memoryFree + memoryCache) / memoryTotal)) * 100; |
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} else { |
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curValue = (1 - (memoryFree / memoryTotal)) * 100; |
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} |
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// normal check |
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newThreshold = checkAttributeThreshold(curValue, reg, false); |
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type = "%"; |
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} |
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int newThreshold = checkAttributeThreshold(memoryInUse, reg); |
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// format the memoryInUse to a String |
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NumberFormat nf = NumberFormat.getInstance(); |
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nf.setMaximumFractionDigits(2); |
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nf.setMinimumFractionDigits(2); |
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String strMemoryInUse = nf.format(memoryInUse); |
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processAlert(newThreshold, attributeName, reg, source, strMemoryInUse); |
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String strCurValue = nf.format(curValue); |
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// set the attributeName nicely |
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String attributeName = type + " Memory in use"; |
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if(useCache) { |
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attributeName += " (ex. cache)"; |
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} |
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processAlert(newThreshold, attributeName, reg, source, strCurValue); |
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} |
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/** |
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* Overrides the {@link java.lang.Object#toString() Object.toString()} |
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* method to provide clean logging (every class should have this). |
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* |
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* This uses the uk.org.iscream.util.NameFormat class |
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* This uses the uk.org.iscream.cms.util.NameFormat class |
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* to format the toString() |
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* |
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* @return the name of this class and its CVS revision |
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} |
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//---PRIVATE METHODS--- |
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private int checkAttributeThreshold(double memoryInUse, Register reg) { |
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/** |
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* Checks a piece of current data, and returns the |
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* threshold it breaches, if any. |
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* |
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* The option to negate the check can be used in |
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* situations where being *below* the threshold |
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* is an 'alertable' situation. In this specific |
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* case, we'd do this with kb disk checks. |
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* |
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* @param value the current value |
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* @param reg the Register for the host |
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* @param negateCheck whether to negate the check |
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* @return the threshold level breached, if any |
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*/ |
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private int checkAttributeThreshold(double value, Register reg, boolean negateCheck) { |
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for(int thresholdLevel = Alert.thresholdLevels.length - 1; thresholdLevel >= 0; thresholdLevel--) { |
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if (reg.getThreshold(thresholdLevel) != -1.0) { |
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if(((double) reg.getThreshold(thresholdLevel)) < memoryInUse) { |
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return thresholdLevel; |
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if(!negateCheck) { |
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// normal check - has the value gone *over* the threshold |
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if(((double) reg.getThreshold(thresholdLevel)) < value) { |
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return thresholdLevel; |
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} |
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} |
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else { |
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// negated check - has the value gone *under* the threshold |
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if(((double) reg.getThreshold(thresholdLevel)) > value) { |
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return thresholdLevel; |
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} |
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} |
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} |
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} |
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return Alert.thresholdNORMAL; |
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} |
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//---ACCESSOR/MUTATOR METHODS--- |
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/** |
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* Returns a reference to a specific Queue for this |
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* monitor. This Queue returns only the data packets |
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* (based on type) that we want too look at. |
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* |
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* @return a reference to a Queue |
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*/ |
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protected Queue getQueue() { |
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return MonitorManager.getInstance().getDataQueue(); |
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} |
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* A reference to the configuration proxy in use |
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*/ |
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private ConfigurationProxy _cp = ConfigurationProxy.getInstance(); |
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/** |
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* A HashMap of Registers (or groups of Registers), one |
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* for each host we're monitoring. |
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*/ |
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private HashMap _hosts = new HashMap(); |
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//---STATIC ATTRIBUTES--- |
