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//---PACKAGE DECLARATION--- |
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package uk.ac.ukc.iscream.client; |
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|
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//---IMPORTS--- |
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import uk.ac.ukc.iscream.componentmanager.*; |
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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 java.util.*; |
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|
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/** |
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* A manager for the Monitors. |
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* |
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* @author $Author: tdb1 $ |
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* @version $Id: MonitorManager.java,v 1.2 2001/03/01 16:52:25 tdb1 Exp $ |
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*/ |
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class AlerterManager extends Thread { |
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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 static final String REVISION = "$Revision: 1.2 $"; |
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|
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//---STATIC METHODS--- |
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|
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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 AlerterManager getInstance() { |
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if (_instance == null){ |
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_instance = new AlerterManager(); |
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} |
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return _instance; |
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} |
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|
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//---CONSTRUCTORS--- |
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|
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public AlerterManager() { |
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_queue = ClientMain._alerterQueue; |
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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 alerter pipeline for plugin alerters ..."); |
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|
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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("Alerter.PluginsPackage"); |
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String pluginsList = config.getProperty("Alerter.Plugins"); |
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|
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StringTokenizer st = new StringTokenizer(pluginsList, ";"); |
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|
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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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|
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// Create an instance of the specified PluginAlerter to include |
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// within the alerterPipe. Add it to the alerterPipeline |
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try { |
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PluginAlerter pa = (PluginAlerter)ClassLoader.getSystemClassLoader().loadClass(className).newInstance(); |
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_alerterPipeline.add(pa); |
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_logger.write(toString(), Logger.DEBUG, "Added alerter: "+className+" ("+pa.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 alerter 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 alerter 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 alerter pipeline has been set up with "+_alerterPipeline.size()+" plugin alerters."); |
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} |
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|
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//---PUBLIC METHODS--- |
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|
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public void run() { |
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|
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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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Alert alert = null; |
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try { |
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alert = (Alert) _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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} |
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|
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// for each alerter in the pipeline... |
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Iterator pluginAlerters = _alerterPipeline.iterator(); |
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while (pluginAlerters.hasNext()){ |
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PluginAlerter alerter = (PluginAlerter)pluginAlerters.next(); |
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alerter.sendAlert(alert); |
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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.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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|
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//---PRIVATE METHODS--- |
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|
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//---ACCESSOR/MUTATOR METHODS--- |
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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 = ClientMain.NAME; |
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|
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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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private Logger _logger = ReferenceManager.getInstance().getLogger(); |
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|
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/** |
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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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/** |
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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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/** |
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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 alerter classes: |
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*/ |
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private final String _suffix = "__Alerter"; |
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|
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/** |
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* LinkedList for holding the PluginAlerter objects (the pipeline). |
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*/ |
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private LinkedList _alerterPipeline = new LinkedList(); |
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|
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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 AlerterManager _instance; |
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|
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} |
