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* @author $Author$ |
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* @version $Id$ |
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*/ |
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class MonitorManager extends Thread{ |
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class MonitorManager extends Thread { |
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//---FINAL ATTRIBUTES--- |
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//---STATIC METHODS--- |
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/** |
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* Return a reference to the single class. |
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* Construct it if it does not already exist, otherwise just return the reference. |
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*/ |
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public static MonitorManager getInstance() { |
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if (_instance == null){ |
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_instance = new MonitorManager(); |
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} |
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return _instance; |
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} |
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//---CONSTRUCTORS--- |
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public MonitorManager(Queue queue) { |
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_queue = queue; |
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private MonitorManager() { |
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_queue = ClientMain._monitorQueue; |
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_qID = _queue.getQueue(); |
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_logger.write(toString(), Logger.SYSINIT, "Initialising"); |
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_logger.write(toString(), Logger.SYSMSG, "Creating monitor pipeline for plugin monitors ..."); |
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// get the configuration for this plug-in setup |
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Configuration config = _refman.getCM().getConfiguration(_name); |
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String pluginsPackage = config.getProperty("Monitor.PluginsPackage"); |
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String pluginsList = config.getProperty("Monitor.Plugins"); |
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StringTokenizer st = new StringTokenizer(pluginsList, ";"); |
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while(st.hasMoreTokens()) { |
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String className = pluginsPackage + "." + st.nextToken() + _suffix; |
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_logger.write(toString(), Logger.DEBUG, "Attempting to create plugin: "+className); |
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// Create an instance of the specified PluginMonitor to include |
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// within the monitorPipe. Add it to the monitorPipeline |
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try { |
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PluginMonitor pm = (PluginMonitor)ClassLoader.getSystemClassLoader().loadClass(className).newInstance(); |
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_monitorPipeline.add(pm); |
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_logger.write(toString(), Logger.DEBUG, "Added monitor: "+className+" ("+pm.getDescription()+")"); |
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} |
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catch (InstantiationException e){ |
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_logger.write(toString(), Logger.ERROR, "Failed to instantiate "+className+" to the plugin monitor pipeline."); |
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_logger.write(toString(), Logger.ERROR, e.getMessage()); |
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} |
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catch (Exception e){ |
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_logger.write(toString(), Logger.ERROR, "Failed to add "+className+" to the plugin monitor pipeline."); |
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_logger.write(toString(), Logger.ERROR, e.toString()); |
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} |
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} |
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_logger.write(toString(), Logger.SYSMSG, "The monitor pipeline has been set up with "+_monitorPipeline.size()+" plugin monitors."); |
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} |
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//---PUBLIC METHODS--- |
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public void run() { |
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LinkedList monitors = setupMonitors(); |
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int qID = _queue.getQueue(); |
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boolean run=true; |
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while(run) { |
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// attempt to get some data from the Queue |
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String xml = ""; |
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try { |
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xml = (String) _queue.get(qID); |
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xml = (String) _queue.get(_qID); |
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} |
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catch(InvalidQueueException e) { |
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_logger.write(toString(), Logger.ERROR, "Queue failure: "+e); |
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continue; |
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} |
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//send to monitors |
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Iterator i = monitors.iterator(); |
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while(i.hasNext()) { |
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((Monitor) i.next()).analysePacket(packet); |
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// for each monitor in the pipeline... |
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Iterator pluginMonitors = _monitorPipeline.iterator(); |
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while (pluginMonitors.hasNext()){ |
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PluginMonitor monitor = (PluginMonitor)pluginMonitors.next(); |
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monitor.analysePacket(packet); |
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} |
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// is that all ? |
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} |
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} |
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} |
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//---PRIVATE METHODS--- |
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// this should be changed to do something a bit |
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// more interesting :) |
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private LinkedList setupMonitors() { |
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LinkedList monitors = new LinkedList(); |
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// add monitors - this should use config/reflection... |
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monitors.add(new uk.ac.ukc.iscream.client.monitors.CPU__Monitor()); |
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return monitors; |
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} |
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//---ACCESSOR/MUTATOR METHODS--- |
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private Logger _logger = ReferenceManager.getInstance().getLogger(); |
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/** |
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* A reference to our QUeue |
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* A reference to the reference manager in use |
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*/ |
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private ReferenceManager _refman = ReferenceManager.getInstance(); |
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/** |
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* A reference to our Queue |
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*/ |
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private Queue _queue; |
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/** |
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* Our queue ID |
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*/ |
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private int _qID; |
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|
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/** |
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* file name suffix for plugin monitor classes: |
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*/ |
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private final String _suffix = "__Monitor"; |
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|
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/** |
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* LinkedList for holding the PluginMonitor objects (the pipeline). |
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*/ |
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private LinkedList _monitorPipeline = new LinkedList(); |
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//---STATIC ATTRIBUTES--- |
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+ |
|
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+ |
/** |
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* A reference to the single instance of this class |
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*/ |
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private static MonitorManager _instance; |
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} |
