server/core/Core.java

//---PACKAGE DECLARATION---
package uk.ac.ukc.iscream.core;

//---IMPORTS---
import org.omg.CORBA.*;
import org.omg.CosNaming.*;
import org.omg.PortableServer.*;
import java.util.*;
import java.io.*;

/**
 * The main class for the CORE of the I-Scream system.
 * The main method of this class initialises the ORB
 * and then starts and registers CORE I-Scream services
 * with the name service.  At which point it essentially
 * finishs its role and the started services continue to
 * serve requests from the I-Scream system.
 *
 * @author  $Author: tdb1 $
 * @version $Id: Core.java,v 1.15 2000/11/21 15:08:42 tdb1 Exp $
 */
class Core {

//---FINAL ATTRIBUTES---

    /**
     * The current CVS revision of this class
     */
    public static final String REVISION = "$Revision: 1.15 $";
    
    /**
     * The toString() of this class
     * As it won't be instatiated, this is needed.
     */
    public static final String toString = "CORE(" + REVISION.substring(11, REVISION.length() - 2) + ")";
    
    /**
     * The default location of the properties file for the system
     */
    public static final String DEFAULTPROPERTIES = "default.properties";
    
//---STATIC METHODS---

    /**
     * The main method which starts the CORE
     * Currently the args are passed direct to the ORB,
     * so any ORB paramaters could go there.
     *
     * @param args the command line arguments
     */
    public static void main(String[] args) {
        System.out.println("--- I-Scream ---");
                
        // get the command line args
        String defaultProperties = DEFAULTPROPERTIES;
        if (args.length > 0) {
            if (args[0].equals("-l")) {
                defaultProperties = args[1];
            } else if (args[0].equals("-h")) {
                usage();
            } else {
                usage();
            }            
        }

        // load the default properties file into the system properties
        System.out.println(toString + ": initialising - using " + defaultProperties);
        try {
            Properties initProperties = new Properties(System.getProperties());
            initProperties.load(new FileInputStream(new File(defaultProperties)));
            System.setProperties(initProperties);


        } catch (Exception e) {
            System.err.println(toString + ": ERROR " + e.getMessage());
            usage();
        }

        // continue to bring the system up
        System.out.println(toString + ": coming up");        
        try {
            // start the ORB
            ORB orb = ORB.init(args, null);
            
            // get the Root POA
            org.omg.CORBA.Object objRef = orb.resolve_initial_references("RootPOA");
            POA poa = POAHelper.narrow(objRef);
            
            // get a hook to the name service
            objRef = orb.resolve_initial_references("NameService");
            NamingContextExt ncRef = NamingContextExtHelper.narrow(objRef);
            
            // check we got it
            if (ncRef == null) {
                throw new Exception("Unable to locate CORBA Naming Service for configured ORB!");
            }
            
            // start and bind each server in turn
            
            // work out which logger to use
            String whichLogger = System.getProperty("uk.ac.ukc.iscream.LoggerClass");
            String loggerPackage = System.getProperty("uk.ac.ukc.iscream.LoggerPackage");
           
            // construct the relevant LoggerImpl
            LoggerImpl loggerImplRef = (LoggerImpl) ClassLoader.getSystemClassLoader().loadClass(loggerPackage + "." + whichLogger).newInstance();
            
            // setup and bind the LoggerServant
            LoggerServant loggerRef = new LoggerServant(loggerImplRef);
            objRef = poa.servant_to_reference(loggerRef);
            ncRef.bind(ncRef.to_name("iscream.Logger"), objRef);
            
            // get a reference to the servant as a Logger
            Logger logRef = LoggerHelper.narrow(objRef);

            // create the Configurator
            ConfigurationManagerServant configManRef = new ConfigurationManagerServant(poa, logRef);
            
            // and advertise it to the naming context
            objRef = poa.servant_to_reference(configManRef);
            ncRef.bind(ncRef.to_name("iscream.ConfigurationManager"), objRef);
            
            // start the POA off
            poa.the_POAManager().activate();
                        
            logRef.write(toString, Logger.SYSINIT, "started");
            
            // now we are running, we just need to serve
            // so we ask the orb to block for us until it has finished
            orb.run();
            
        // if there was a problem then we'll get to here    
        } catch (Exception e) {
            
            // there is already another CORE of the same name registered
            if ( e instanceof org.omg.CosNaming.NamingContextPackage.AlreadyBound) {
                System.err.println("CORE ERROR: Another I-Scream CORE is already registered under the same name.");
            
            // otherwise we don't know what happened
            // so print the error and do a stack trace if debug is enabled
            } else {
                System.err.println("CORE ERROR: " + e.getMessage());
                if (Integer.parseInt(System.getProperty("uk.ac.ukc.iscream.Verbosity")) == Logger.DEBUG) {
                    System.err.println("*** DEBUG ENABLED - printing stack trace ***");
                    e.printStackTrace(System.out);
                }
            }
        }
    }
    
    /** 
     * A simple method to print the usage of this class.
     * It never returns, but instead exits to the system
     * with a value 1, to indicate the system did not start
     * properly.
     */
    public static void usage() {
        System.out.println("USAGE: java Core <option>");
        System.out.println("WHERE <option>:");
        System.out.println("      -l <filename> - the location of initial system properties");
        System.out.println("      -h            - this help screen");
        System.exit(1);
    }

//---CONSTRUCTORS---

//---PUBLIC METHODS---

//---PRIVATE METHODS---

//---ACCESSOR/MUTATOR METHODS---

//---ATTRIBUTES---
    
//---STATIC ATTRIBUTES---

}
Revision:	1.16
Committed:	Wed Nov 29 21:27:08 2000 UTC (23 years, 6 months ago) by ajm
Branch:	MAIN
Branch point for:	SERVER_PACKAGEBUILD
Changes since 1.15:	+7 -18 lines
Log Message:	Update for package move.
#	User	Rev	Content
1	tdb	1.13	//---PACKAGE DECLARATION---
2	ajm	1.16	package uk.ac.ukc.iscream.core;
3	tdb	1.13
4			//---IMPORTS---
5			import org.omg.CORBA.*;
6			import org.omg.CosNaming.*;
7			import org.omg.PortableServer.*;
8			import java.util.*;
9			import java.io.*;
10
11			/**
12			* The main class for the CORE of the I-Scream system.
13			* The main method of this class initialises the ORB
14			* and then starts and registers CORE I-Scream services
15			* with the name service. At which point it essentially
16			* finishs its role and the started services continue to
17			* serve requests from the I-Scream system.
18			*
19	ajm	1.16	* @author $Author: tdb1 $
20			* @version $Id: Core.java,v 1.15 2000/11/21 15:08:42 tdb1 Exp $
21	tdb	1.13	*/
22			class Core {
23
24			//---FINAL ATTRIBUTES---
25
26			/**
27			* The current CVS revision of this class
28			*/
29	ajm	1.16	public static final String REVISION = "$Revision: 1.15 $";
30	tdb	1.13
31			/**
32			* The toString() of this class
33			* As it won't be instatiated, this is needed.
34			*/
35			public static final String toString = "CORE(" + REVISION.substring(11, REVISION.length() - 2) + ")";
36
37			/**
38			* The default location of the properties file for the system
39			*/
40			public static final String DEFAULTPROPERTIES = "default.properties";
41
42			//---STATIC METHODS---
43
44			/**
45			* The main method which starts the CORE
46			* Currently the args are passed direct to the ORB,
47			* so any ORB paramaters could go there.
48			*
49			* @param args the command line arguments
50			*/
51			public static void main(String[] args) {
52			System.out.println("--- I-Scream ---");
53
54			// get the command line args
55			String defaultProperties = DEFAULTPROPERTIES;
56			if (args.length > 0) {
57			if (args[0].equals("-l")) {
58			defaultProperties = args[1];
59			} else if (args[0].equals("-h")) {
60			usage();
61			} else {
62			usage();
63			}
64			}
65
66			// load the default properties file into the system properties
67			System.out.println(toString + ": initialising - using " + defaultProperties);
68			try {
69			Properties initProperties = new Properties(System.getProperties());
70			initProperties.load(new FileInputStream(new File(defaultProperties)));
71			System.setProperties(initProperties);
72
73
74			} catch (Exception e) {
75			System.err.println(toString + ": ERROR " + e.getMessage());
76			usage();
77			}
78
79			// continue to bring the system up
80			System.out.println(toString + ": coming up");
81			try {
82			// start the ORB
83			ORB orb = ORB.init(args, null);
84
85			// get the Root POA
86			org.omg.CORBA.Object objRef = orb.resolve_initial_references("RootPOA");
87			POA poa = POAHelper.narrow(objRef);
88
89			// get a hook to the name service
90			objRef = orb.resolve_initial_references("NameService");
91			NamingContextExt ncRef = NamingContextExtHelper.narrow(objRef);
92
93	ajm	1.14	// check we got it
94			if (ncRef == null) {
95			throw new Exception("Unable to locate CORBA Naming Service for configured ORB!");
96			}
97
98	tdb	1.13	// start and bind each server in turn
99
100			// work out which logger to use
101	ajm	1.16	String whichLogger = System.getProperty("uk.ac.ukc.iscream.LoggerClass");
102			String loggerPackage = System.getProperty("uk.ac.ukc.iscream.LoggerPackage");
103	tdb	1.13
104			// construct the relevant LoggerImpl
105	ajm	1.16	LoggerImpl loggerImplRef = (LoggerImpl) ClassLoader.getSystemClassLoader().loadClass(loggerPackage + "." + whichLogger).newInstance();
106	tdb	1.13
107			// setup and bind the LoggerServant
108			LoggerServant loggerRef = new LoggerServant(loggerImplRef);
109			objRef = poa.servant_to_reference(loggerRef);
110			ncRef.bind(ncRef.to_name("iscream.Logger"), objRef);
111
112			// get a reference to the servant as a Logger
113			Logger logRef = LoggerHelper.narrow(objRef);
114
115			// create the Configurator
116			ConfigurationManagerServant configManRef = new ConfigurationManagerServant(poa, logRef);
117
118			// and advertise it to the naming context
119			objRef = poa.servant_to_reference(configManRef);
120			ncRef.bind(ncRef.to_name("iscream.ConfigurationManager"), objRef);
121
122			// start the POA off
123			poa.the_POAManager().activate();
124
125			logRef.write(toString, Logger.SYSINIT, "started");
126
127			// now we are running, we just need to serve
128			// so we ask the orb to block for us until it has finished
129			orb.run();
130
131			// if there was a problem then we'll get to here
132			} catch (Exception e) {
133
134			// there is already another CORE of the same name registered
135			if ( e instanceof org.omg.CosNaming.NamingContextPackage.AlreadyBound) {
136	ajm	1.14	System.err.println("CORE ERROR: Another I-Scream CORE is already registered under the same name.");
137	tdb	1.13
138			// otherwise we don't know what happened
139	ajm	1.14	// so print the error and do a stack trace if debug is enabled
140	tdb	1.13	} else {
141	ajm	1.14	System.err.println("CORE ERROR: " + e.getMessage());
142			if (Integer.parseInt(System.getProperty("uk.ac.ukc.iscream.Verbosity")) == Logger.DEBUG) {
143			System.err.println("* DEBUG ENABLED - printing stack trace *");
144			e.printStackTrace(System.out);
145			}
146	tdb	1.13	}
147			}
148			}
149
150			/**
151			* A simple method to print the usage of this class.
152			* It never returns, but instead exits to the system
153			* with a value 1, to indicate the system did not start
154			* properly.
155			*/
156			public static void usage() {
157	tdb	1.15	System.out.println("USAGE: java Core <option>");
158	tdb	1.13	System.out.println("WHERE <option>:");
159			System.out.println(" -l <filename> - the location of initial system properties");
160			System.out.println(" -h - this help screen");
161			System.exit(1);
162			}
163
164			//---CONSTRUCTORS---
165
166			//---PUBLIC METHODS---
167
168			//---PRIVATE METHODS---
169
170			//---ACCESSOR/MUTATOR METHODS---
171
172			//---ATTRIBUTES---
173
174			//---STATIC ATTRIBUTES---
175
176			}