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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.ac.ukc.iscream.client; |
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package uk.org.iscream.cms.server.client; |
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//---IMPORTS--- |
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import java.util.HashMap; |
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import uk.ac.ukc.iscream.client.*; |
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import uk.ac.ukc.iscream.core.*; |
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import uk.ac.ukc.iscream.util.*; |
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import uk.ac.ukc.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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* Skeleton class for Monitors |
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* This skeleton reads packets from a queue designated |
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* by the extending class, it then feeds the data to the analysePacket |
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* method, which the extending class should implement. The class |
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* should then handle the monitoring for that packet. |
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* |
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* @author $Author$ |
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* @version $Id$ |
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*/ |
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public abstract class MonitorSkeleton implements PluginMonitor { |
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public abstract class MonitorSkeleton extends Thread implements PluginMonitor { |
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//---FINAL ATTRIBUTES--- |
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/** |
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* The current CVS revision of this class |
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*/ |
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public final String REVISION = "$Revision$"; |
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//---STATIC METHODS--- |
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//---CONSTRUCTORS--- |
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/** |
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* Constructs and start the monitor reading its data |
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*/ |
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public MonitorSkeleton() { |
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_logger.write(toString(), Logger.SYSINIT, "started."); |
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this.start(); |
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} |
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|
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//---PUBLIC METHODS--- |
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public abstract void analysePacket(XMLPacket packet); |
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/** |
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* Obtains data from the monitors data queue and |
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* passes the packet to the analysePacket method. |
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*/ |
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public void run() { |
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while(_running) { |
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try { |
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// check if monitoring is enabled for this host |
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// if not - just don't bother analyse it's packets |
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XMLPacket packet = (XMLPacket) getQueue().get(getQueueId()); |
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String source = packet.getParam("packet.attributes.machine_name"); |
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boolean enabled = checkBooleanConfig("Host." + source, "Monitor.enable"); |
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if(enabled) { |
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analysePacket(packet); |
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} |
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else { |
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_logger.write(this.toString(), Logger.DEBUG, "Skipping monitoring of host: " + source); |
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} |
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} catch (InvalidQueueException e) { |
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_logger.write(this.toString(), Logger.ERROR, "Unable to get queue."); |
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} |
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} |
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} |
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/** |
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* Extending classes should override this method to |
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* analyse the given packet for the attribute |
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* they are responsible for. |
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*/ |
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protected abstract void analysePacket(XMLPacket packet); |
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public void processAlert(int newThreshold, String attributeName, Register reg, String source, String currentValue) { |
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/** |
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* Once a Monitor has determined which threshold the given data packet |
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* is at, it should then call this method. This method handles ALL |
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* the alerting logic to determine escalation of alerts. |
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* If it decides an alert needs to be send, it will send one using fireAlert. |
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* |
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* @param newThreshold the threshold that has been determined by the monitor |
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* @param attributeName the textual name of the attribute the monitor is responsible for |
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* @param reg the register that holds the current alert state for the machine/attribute |
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* @param source the source of the alert eg, hostname |
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* @param currentValue the data value for the attribute |
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*/ |
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protected void processAlert(int newThreshold, String attributeName, Register reg, String source, String currentValue) { |
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// decide what threshold level we're on, if we've changed, record that |
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if (newThreshold != reg.getLastThresholdLevel()) { |
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reg.setLastThresholdLevel(newThreshold); |
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} |
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/** |
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* return the String representation of what the monitor does |
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* Return the String representation of what the alerter does |
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* |
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* @return the description |
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*/ |
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public abstract String getDescription(); |
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/** |
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* Checks a boolean configuration variable. |
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* |
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* @param source the configuration to look up |
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* @param name the key to look up |
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*/ |
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protected boolean checkBooleanConfig(String source, String name) { |
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boolean enabled = true; |
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try { |
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int e = Integer.parseInt(_cp.getProperty(source, name)); |
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enabled = (e == 1); |
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} catch (PropertyNotFoundException e) { |
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enabled = false; |
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} catch (NumberFormatException e) { |
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enabled = false; |
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} |
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return enabled; |
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} |
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//---PRIVATE METHODS--- |
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protected void fireAlert(Register reg, int lastAlert, String source, String currentValue, String attributeName) { |
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/** |
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* Fires an alert. This creates a new Alert object |
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* and populates it with the given alert information. |
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* It then adds the alert to the Alerter queue. |
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* |
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* This method should only be called by the processAlert method. |
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* |
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* @param reg the register holding the state values for the alert |
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* @param source the source of the alert eg, hostname |
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* @param currentValue the data value for the attribute |
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* @param attributeName the textual name of the attribute the alert is for |
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*/ |
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private void fireAlert(Register reg, int lastAlert, String source, String currentValue, String attributeName) { |
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int alertLevel = reg.getLastAlertLevel(); |
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int thresholdLevel = reg.getLastThresholdLevel(); |
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String thresholdValue = String.valueOf(reg.getThreshold(thresholdLevel)); |
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String timeout = String.valueOf(reg.getAlertTimeout(reg.getLastAlertLevel()) / 1000); |
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if (thresholdLevel == Alert.thresholdNORMAL) { |
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// ensures we display a nice thing if its -1.0 |
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if (thresholdValue.equals("-1.0")) { |
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thresholdValue = "-"; |
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} |
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if (alertLevel == Alert.alertOK) { |
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//---ACCESSOR/MUTATOR METHODS--- |
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/** |
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* Obtain the queue which contains the data |
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* the Monitor is reading. |
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* eg, MonitorManager.getInstance().getDataQueue() |
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*/ |
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protected abstract Queue getQueue(); |
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|
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/** |
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* Create a queue ID on the feeding |
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* data queue |
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*/ |
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protected int getQueueId() { |
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if (_qID == -1) { |
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_qID = getQueue().getQueue(); |
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_logger.write(toString(), Logger.DEBUG, "Assigned Queue - " + _qID); |
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} |
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return _qID; |
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} |
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|
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//---ATTRIBUTES--- |
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/** |
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* This holds a reference to the |
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* system logger that is being used. |
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*/ |
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protected Logger _logger = ReferenceManager.getInstance().getLogger(); |
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protected Queue _alerterQueue = ClientMain._alerterQueue; |
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/** |
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* A reference to the Alerter queue, into which |
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* all new alerts will be placed. |
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*/ |
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protected Queue _alerterQueue = AlerterManager.getInstance().getQueue(); |
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|
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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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/** |
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* The ID of the queue the monitor will use. |
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* Initially -1, but initialised on first use. |
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*/ |
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protected int _qID = -1; |
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|
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/** |
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* The state of the alerter thread |
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*/ |
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protected boolean _running = true; |
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//---STATIC ATTRIBUTES--- |
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