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//---PACKAGE DECLARATION--- |
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package uk.org.iscream.client.monitors; |
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|
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//---IMPORTS--- |
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import java.util.HashMap; |
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import java.util.ArrayList; |
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import java.util.Set; |
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import java.util.Iterator; |
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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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|
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/** |
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* This Monitor watches the internal server queues. |
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* YES! this system is SO great it monitors itself! |
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* |
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* @author $Author: ajm4 $ |
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* @version $Id: Queue__Monitor.java,v 1.7 2001/03/22 22:34:18 ajm4 Exp $ |
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*/ |
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public class Queue__Monitor extends MonitorSkeleton { |
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|
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//---FINAL ATTRIBUTES--- |
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|
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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: 1.7 $"; |
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|
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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 = "Who watches the watchmen?"; |
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|
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private final String SOURCE = "i-scream-server"; |
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|
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//---STATIC METHODS--- |
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|
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//---CONSTRUCTORS--- |
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|
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//---PUBLIC METHODS--- |
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|
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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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if (packet.getParam("packet.attributes.type").equals("queueStat")) { |
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String source = packet.getParam("packet.attributes.hashCode"); |
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if (!_hosts.containsKey(source)) { |
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_hosts.put(source, new HashMap()); |
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} |
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|
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HashMap queueRegisters = (HashMap) _hosts.get(source); |
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|
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// get info about the source queue class instance |
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String queueName = packet.getParam("packet.attributes.name"); |
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String maxQueueSize = packet.getParam("packet.queue.attributes.maxSize"); |
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// unfortunatly we need to check the whole packet |
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// to find the queues, and then get the data attributes |
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Set packetSet = packet.getSet(); |
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Iterator i = packetSet.iterator(); |
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|
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while (i.hasNext()) { |
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String dataKey = (String) i.next(); |
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if(dataKey.startsWith("packet.queue.attributes.queue")) { |
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String queueSize = packet.getParam(dataKey); |
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|
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// *** now process this queue *** |
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|
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// check if we've seen this queue before on a previous run |
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// if not, we need to create a register for it |
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if(!queueRegisters.containsKey(dataKey)) { |
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queueRegisters.put(dataKey, new Register(source, _name)); |
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} |
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|
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// get the register for this disk |
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Register reg = (Register) queueRegisters.get(dataKey); |
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|
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// get the packet data |
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double qMax, qSize; |
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try { |
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|
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if(maxQueueSize==null || queueSize==null) { |
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throw new NumberFormatException("Queue data invalid"); |
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} |
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qMax = Double.parseDouble(maxQueueSize); |
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qSize = Double.parseDouble(queueSize); |
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} catch (NumberFormatException e) { |
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_logger.write(this.toString(), Logger.WARNING, "Received packet from "+source+" with bad queue information: "+e); |
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// don't try to continue and process, try next queue |
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break; |
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} |
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|
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boolean useValue = false; |
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try { |
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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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} catch (PropertyNotFoundException e) { |
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// we default to percentage |
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} |
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|
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// this bit determines if the disk check is a % check |
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// or a kb check |
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double checkValue; |
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String type; |
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if(useValue) { |
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// queue count |
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checkValue = qSize; |
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type = "count"; |
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} else { |
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// % of queue |
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checkValue = (qSize / qMax) * 100; |
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type = "%"; |
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} |
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|
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int newThreshold = checkAttributeThreshold(checkValue, reg); |
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|
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// format the checkValue 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 strCheckValue = nf.format(checkValue); |
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|
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// say which disk had the problem |
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String attributeName = "Size of queue " + type + " in " + queueName + " " + dataKey.substring(dataKey.lastIndexOf('.')); |
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|
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processAlert(newThreshold, attributeName, reg, SOURCE, strCheckValue); |
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|
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} |
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} |
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} |
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} |
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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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* 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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public String toString() { |
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return FormatName.getName( |
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_name, |
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getClass().getName(), |
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REVISION); |
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} |
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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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*/ |
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public String getDescription(){ |
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return DESC; |
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} |
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|
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//---PRIVATE METHODS--- |
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|
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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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* @param qSize the size of a queue |
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* @param reg the Register for the host |
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* @return the threshold level breached, if any |
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*/ |
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private int checkAttributeThreshold(double qSize, Register reg) { |
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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)) < qSize) { |
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return thresholdLevel; |
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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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|
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//---ACCESSOR/MUTATOR METHODS--- |
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|
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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().getOtherQueue(); |
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} |
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|
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|
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//---ATTRIBUTES--- |
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|
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/** |
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* This is the friendly identifier of the |
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* component this class is running in. |
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* eg, a Filter may be called "filter1", |
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* If this class does not have an owning |
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* component, a name from the configuration |
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* can be placed here. This name could also |
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* be changed to null for utility classes. |
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*/ |
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private String _name = "Queue"; |
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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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* 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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|
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//---STATIC ATTRIBUTES--- |
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|
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} |