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//---PACKAGE DECLARATION--- |
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|
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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 java.util.*; |
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import java.io.*; |
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|
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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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* 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: tdb1 $ |
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* @version $Id: Core.java,v 1.11 2000/11/17 16:25:18 tdb1 Exp $ |
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*/ |
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class Core { |
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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: 1.11 $"; |
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|
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/** |
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* The toString() of this class |
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* As it won't be instatiated, this is needed. |
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*/ |
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public static final String toString = "CORE(" + REVISION.substring(11, REVISION.length() - 2) + ")"; |
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|
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/** |
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* The default location of the properties file for the system |
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*/ |
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public static final String DEFAULTPROPERTIES = "default.properties"; |
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|
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//---STATIC METHODS--- |
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|
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/** |
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* The main method which 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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|
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// get the command line args |
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String defaultProperties = DEFAULTPROPERTIES; |
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if (args.length > 0) { |
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if (args[0].equals("-l")) { |
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defaultProperties = args[1]; |
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} else if (args[0].equals("-h")) { |
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usage(); |
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} else { |
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usage(); |
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} |
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} |
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|
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// load the default properties file into the system properties |
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System.out.println(toString + ": initialising - using " + defaultProperties); |
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try { |
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Properties initProperties = new Properties(System.getProperties()); |
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initProperties.load(new FileInputStream(new File(defaultProperties))); |
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System.setProperties(initProperties); |
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|
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|
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} catch (Exception e) { |
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System.err.println(toString + ": ERROR " + e.getMessage()); |
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usage(); |
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} |
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|
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// continue to bring the system up |
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System.out.println(toString + ": coming up"); |
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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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|
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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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|
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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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|
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// start and bind each server in turn |
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|
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// work out the verbosity setting & which logger to use |
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int verbosity = Integer.parseInt(System.getProperty("uk.ac.ukc.iscream.Verbosity", defaultVerbosity)); |
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String whichLogger = System.getProperty("uk.ac.ukc.iscream.LoggerClass", defaultLogger); |
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String loggerParams = System.getProperty("uk.ac.ukc.iscream.LoggerClassParams"); |
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|
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Logger logRef = null; |
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// create the logger (either Screen or File), and bind it |
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if(whichLogger.equals("ScreenLogger")){ |
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ScreenLoggerServant loggerRef = new ScreenLoggerServant(verbosity); |
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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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logRef = LoggerHelper.narrow(objRef); |
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} |
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else if(whichLogger.equals("FileLogger")){ |
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FileLoggerServant loggerRef = new FileLoggerServant(loggerParams, verbosity); |
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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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logRef = LoggerHelper.narrow(objRef); |
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} |
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else { |
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//need to deal with this |
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} |
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|
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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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|
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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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|
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// create the Configurator |
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String configLocation = System.getProperty("uk.ac.ukc.iscream.ConfigurationLocation", defaultConfigPath); |
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ConfigurationManagerServant configManRef = new ConfigurationManagerServant(poa, logRef); |
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|
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// and advertise it to the naming context |
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objRef = poa.servant_to_reference(configManRef); |
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ncRef.bind(ncRef.to_name("iscream.ConfigurationManager"), objRef); |
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|
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// start the POA off |
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poa.the_POAManager().activate(); |
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|
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logRef.write(toString, Logger.SYSINIT, "started"); |
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|
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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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|
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// if there was a problem then we'll get to here |
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} catch (Exception e) { |
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|
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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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|
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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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} |
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} |
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|
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/** |
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* A simple method to print the usage of this class. |
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* It never returns, but instead exits to the system |
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* with a value 1, to indicate the system did not start |
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* properly. |
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*/ |
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public static void usage() { |
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System.out.println("USAGE: java Core.java <option>"); |
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System.out.println("WHERE <option>:"); |
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System.out.println(" -l <filename> - the location of initial system properties"); |
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System.out.println(" -h - this help screen"); |
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System.exit(1); |
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} |
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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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//---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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//---STATIC ATTRIBUTES--- |
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|
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/** |
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* Default verbosity setting, to be used when one is |
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* not provided in the configuration. |
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*/ |
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private static final String defaultVerbosity = "3"; |
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|
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/** |
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* Default logger, to be used when one is not provided |
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* in the configuration. |
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*/ |
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private static final String defaultLogger = "ScreenLogger"; |
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|
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/** |
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* Default configPath, to be used when one is not provided |
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* in the configuration. |
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*/ |
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private static final String defaultConfigPath = "."; |
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|
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} |
