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//---PACKAGE DECLARATION--- |
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package uk.ac.ukc.iscream.util; |
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//---IMPORTS--- |
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import uk.ac.ukc.iscream.util.*; |
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import uk.ac.ukc.iscream.componentmanager.*; |
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/** |
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* This class monitors a given Queue at regular intervals, |
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* reporting back to a Queue with XML - this could be the |
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* same Queue being monitored. |
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* |
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* @author $Author$ |
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* @version $Id$ |
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*/ |
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class QueueMonitor extends Thread { |
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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 static final String REVISION = "$Revision: 1.1 $"; |
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//---STATIC METHODS--- |
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//---CONSTRUCTORS--- |
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/** |
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* Construct a new QueueMonitor. |
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* |
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* @param sourceQueue The Queue to monitor |
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* @param destQueue The Queue to monitor to |
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* @param interval The interval, in milliseconds, at which to sample |
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* @param name A name to identify the source Queue with |
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*/ |
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public QueueMonitor (Queue sourceQueue, Queue destQueue, long interval, String name) { |
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_sourceQueue = sourceQueue; |
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_destQueue = destQueue; |
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_interval = interval; |
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_srcName = name; |
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} |
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//---PUBLIC METHODS--- |
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/** |
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* Loops continuosly polling our source Queue at |
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* the given interval, and then logging the results |
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* in the destination Queue. |
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*/ |
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public void run() { |
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_run = true; |
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// so we can stop this thread... |
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while(_run) { |
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// first sleep for our interval |
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try { Thread.sleep(_interval); } catch(Exception e) {} |
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// check the Queue |
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String status = _sourceQueue.xmlStatus(); |
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// create some XML |
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String date = new Long(System.currentTimeMillis()/((long) 1000)).toString(); |
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String xml = "<packet type=\"queueStat\" date=\""+date+"\" name=\""+_srcName+"\">" + status + "</packet>"; |
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// write XML to destination Queue |
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_destQueue.add(xml); |
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} |
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} |
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/** |
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* Shuts down this QueueMonitor |
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*/ |
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public void shutdown() { |
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// this will stop the main loop |
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_run = false; |
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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.ac.ukc.iscream.util.FormatName 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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//---PRIVATE METHODS--- |
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//---ACCESSOR/MUTATOR METHODS--- |
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//---ATTRIBUTES--- |
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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 = null; |
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/** |
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* The Queue we're monitoring. |
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*/ |
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private Queue _sourceQueue; |
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/** |
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* The Queue we'll output results to. |
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*/ |
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private Queue _destQueue; |
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/** |
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* The interval at which we'll check the |
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* sourceQueue status. |
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*/ |
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private long _interval; |
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/** |
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* The name to identify the source Queue |
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*/ |
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private String _srcName; |
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/** |
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* Allows us to stop the main loop cleanly. |
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*/ |
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private boolean _run; |
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//---STATIC ATTRIBUTES--- |
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} |