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//---PACKAGE DECLARATION--- |
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package uk.ac.ukc.iscream.core; |
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//---IMPORTS--- |
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import uk.ac.ukc.iscream.core.*; |
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import org.omg.CORBA.*; |
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import org.omg.CosNaming.*; |
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import org.omg.PortableServer.*; |
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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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* The main class for the CORE of the I-Scream system. |
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* The main method of this class initialises the ORB |
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* and then starts and registers CORE I-Scream services |
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* with the name service. At which point it essentially |
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* This class is the component for CORE I-Scream services |
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* namely the Logger and the ConfigurationManager. |
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* It registers and starts them, at which point it essentially |
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* finishs its role and the started services continue to |
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* serve requests from the I-Scream system. |
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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 Core { |
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public class Core implements uk.ac.ukc.iscream.util.Component { |
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//---FINAL ATTRIBUTES--- |
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*/ |
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public static final String REVISION = "$Revision$"; |
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/** |
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* The friendly name for this component, used by |
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* all related classes. |
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*/ |
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public static final String NAME = "Core"; |
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//---STATIC METHODS--- |
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//---CONSTRUCTORS--- |
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//---PUBLIC METHODS--- |
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/** |
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* The main method which starts the CORE |
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* This method starts the CORE |
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* Currently the args are passed direct to the ORB, |
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* so any ORB paramaters could go there. |
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* |
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* @param args the command line arguments |
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*/ |
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public static void main(String[] args) { |
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System.out.println("--- I-Scream ---"); |
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public void start() throws ComponentStartException { |
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// start and bind each server in turn |
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// can't have a real toString() :) |
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String toString = "CORE(" + REVISION.substring(11, REVISION.length() - 2) + ")"; |
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System.out.println(toString + ": coming up"); |
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// work out which logger to use |
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String whichLogger = System.getProperty("uk.ac.ukc.iscream.LoggerClass"); |
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String loggerPackage = System.getProperty("uk.ac.ukc.iscream.LoggerPackage"); |
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// construct the relevant LoggerImpl |
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LoggerImpl loggerImplRef = null; |
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try { |
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// start the ORB |
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ORB orb = ORB.init(args, null); |
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// get the Root POA |
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org.omg.CORBA.Object objRef = orb.resolve_initial_references("RootPOA"); |
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POA poa = POAHelper.narrow(objRef); |
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// get a hook to the name service |
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objRef = orb.resolve_initial_references("NameService"); |
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NamingContextExt ncRef = NamingContextExtHelper.narrow(objRef); |
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// start and bind each server in turn |
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// create the logger (either Screen or File) |
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ScreenLoggerServant loggerRef = new ScreenLoggerServant(); |
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//FileLoggerServant loggerRef = new FileLoggerServant("core.log"); |
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// and advertise it to the naming context |
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objRef = poa.servant_to_reference(loggerRef); |
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ncRef.bind(ncRef.to_name("iscream.Logger"), objRef); |
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// get a ref to the logger servant as a Logger reference |
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Logger logRef = LoggerHelper.narrow(objRef); |
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// create the Configurator |
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ConfiguratorServant configuratorRef = new ConfiguratorServant(poa, logRef); |
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// and advertise it to the naming context |
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objRef = poa.servant_to_reference(configuratorRef); |
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ncRef.bind(ncRef.to_name("iscream.Configurator"), objRef); |
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// start the POA off |
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poa.the_POAManager().activate(); |
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logRef.write(toString, "started"); |
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// now we are running, we just need to serve |
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// so we ask the orb to block for us until it has finished |
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orb.run(); |
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// if there was a problem then we'll get to here |
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loggerImplRef = (LoggerImpl) ClassLoader.getSystemClassLoader().loadClass(loggerPackage + "." + whichLogger).newInstance(); |
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} catch (Exception e) { |
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// there is already another CORE of the same name registered |
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if ( e instanceof org.omg.CosNaming.NamingContextPackage.AlreadyBound) { |
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System.err.println("ERROR: Another I-Scream CORE is already registered under the same name."); |
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// otherwise we don't know what happened |
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// so print the error and do a stack trace |
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} else { |
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System.err.println("CORE ERROR: " + e); |
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e.printStackTrace(System.out); |
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} |
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// if anything goes wrong we throw a failed start exception |
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throw new ComponentStartException("unable to load logging class"); |
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} |
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} |
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//---CONSTRUCTORS--- |
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// setup and bind the LoggerServant |
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LoggerServant loggerRef = new LoggerServant(loggerImplRef); |
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_refman.bindToOrb(loggerRef, "iscream.Logger"); |
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//---PUBLIC METHODS--- |
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// get a reference to the servant as a Logger |
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_logger = _refman.getLogger(); |
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// create the Configurator |
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ConfigurationManagerServant configManRef = new ConfigurationManagerServant(); |
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// and advertise it to the naming context |
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_refman.bindToOrb(configManRef, "iscream.ConfigurationManager"); |
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_logger.write(toString(), Logger.SYSINIT, "started"); |
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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.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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//---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 = Core.NAME; |
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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; |
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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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//---STATIC ATTRIBUTES--- |
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} |
