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root/i-scream/projects/cms/source/server/uk/org/iscream/cms/server/core/Core.java

Comparing projects/cms/source/server/uk/org/iscream/cms/server/core/Core.java (file contents):
Revision 1.15 by tdb, Tue Nov 21 15:08:42 2000 UTC vs.
Revision 1.20 by ajm, Tue Dec 12 19:56:08 2000 UTC

#	Line 1 | Line 1
1		//---PACKAGE DECLARATION---
2	+	package uk.ac.ukc.iscream.core;
3
4		//---IMPORTS---
5	<	import uk.ac.ukc.iscream.core.*;
5	<	import org.omg.CORBA.*;
6	<	import org.omg.CosNaming.*;
7	<	import org.omg.PortableServer.*;
8	<	import java.util.*;
9	<	import java.io.*;
5	>	import uk.ac.ukc.iscream.util.*;
6
7		/**
8		* The main class for the CORE of the I-Scream system.
9	<	* The main method of this class initialises the ORB
10	<	* and then starts and registers CORE I-Scream services
11	<	* with the name service.  At which point it essentially
9	>	* This class is the component for CORE I-Scream services
10	>	* namely the Logger and the ConfigurationManager.
11	>	* It registers and starts them, at which point it essentially
12		* finishs its role and the started services continue to
13		* serve requests from the I-Scream system.
14		*
15		* @author  $Author$
16		* @version $Id$
17		*/
18	<	class Core {
18	>	public class Core implements uk.ac.ukc.iscream.util.Component {
19
20		//---FINAL ATTRIBUTES---
21
#	Line 29 | Line 25 | class Core {
25		public static final String REVISION = "$Revision$";
26
27		/**
28	<	* The toString() of this class
29	<	* As it won't be instatiated, this is needed.
28	>	* The friendly name for this component, used by
29	>	* all related classes.
30		*/
31	<	public static final String toString = "CORE(" + REVISION.substring(11, REVISION.length() - 2) + ")";
31	>	public static final String NAME = "Core";
32
37	–	/**
38	–	* The default location of the properties file for the system
39	–	*/
40	–	public static final String DEFAULTPROPERTIES = "default.properties";
41	–
33		//---STATIC METHODS---
34
35	+	//---CONSTRUCTORS---
36	+
37	+	//---PUBLIC METHODS---
38	+
39		/**
40	<	* The main method which starts the CORE
40	>	* This method starts the CORE
41		* Currently the args are passed direct to the ORB,
42		* so any ORB paramaters could go there.
43		*
49	–	* @param args the command line arguments
44		*/
45	<	public static void main(String[] args) {
46	<	System.out.println("--- I-Scream ---");
47	<
48	<	// get the command line args
49	<	String defaultProperties = DEFAULTPROPERTIES;
50	<	if (args.length > 0) {
51	<	if (args[0].equals("-l")) {
52	<	defaultProperties = args[1];
53	<	} 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);
45	>	public void start() throws ComponentStartException {
46	>	// start and bind each server in turn
47	>
48	>	// work out which logger to use
49	>	String whichLogger = System.getProperty("uk.ac.ukc.iscream.LoggerClass");
50	>	String loggerPackage = System.getProperty("uk.ac.ukc.iscream.LoggerPackage");
51	>
52	>	// construct the relevant LoggerImpl
53	>	LoggerImpl loggerImplRef = null;
54		try {
55	<	Properties initProperties = new Properties(System.getProperties());
70	<	initProperties.load(new FileInputStream(new File(defaultProperties)));
71	<	System.setProperties(initProperties);
72	<
73	<
55	>	loggerImplRef = (LoggerImpl) ClassLoader.getSystemClassLoader().loadClass(loggerPackage + "." + whichLogger).newInstance();
56		} catch (Exception e) {
57	<	System.err.println(toString + ": ERROR " + e.getMessage());
58	<	usage();
57	>	// if anything goes wrong we throw a failed start exception
58	>	throw new ComponentStartException("unable to load logging class");
59		}
60
61	<	// continue to bring the system up
62	<	System.out.println(toString + ": coming up");
63	<	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	<	// check we got it
94	<	if (ncRef == null) {
95	<	throw new Exception("Unable to locate CORBA Naming Service for configured ORB!");
96	<	}
97	<
98	<	// start and bind each server in turn
99	<
100	<	// work out which logger to use
101	<	String whichLogger = System.getProperty("uk.ac.ukc.iscream.LoggerClass", defaultLogger);
102	<
103	<	// construct the relevant LoggerImpl
104	<	LoggerImpl loggerImplRef = (LoggerImpl) ClassLoader.getSystemClassLoader().loadClass(whichLogger).newInstance();
105	<
106	<	// setup and bind the LoggerServant
107	<	LoggerServant loggerRef = new LoggerServant(loggerImplRef);
108	<	objRef = poa.servant_to_reference(loggerRef);
109	<	ncRef.bind(ncRef.to_name("iscream.Logger"), objRef);
110	<
111	<	// get a reference to the servant as a Logger
112	<	Logger logRef = LoggerHelper.narrow(objRef);
61	>	// setup and bind the LoggerServant
62	>	LoggerServant loggerRef = new LoggerServant(loggerImplRef);
63	>	_refman.bindToOrb(loggerRef, "iscream.Logger");
64
65	<	// create the Configurator
66	<	ConfigurationManagerServant configManRef = new ConfigurationManagerServant(poa, logRef);
67	<
68	<	// and advertise it to the naming context
69	<	objRef = poa.servant_to_reference(configManRef);
70	<	ncRef.bind(ncRef.to_name("iscream.ConfigurationManager"), objRef);
71	<
72	<	// start the POA off
73	<	poa.the_POAManager().activate();
74	<
124	<	logRef.write(toString, Logger.SYSINIT, "started");
125	<
126	<	// now we are running, we just need to serve
127	<	// so we ask the orb to block for us until it has finished
128	<	orb.run();
129	<
130	<	// if there was a problem then we'll get to here
131	<	} catch (Exception e) {
132	<
133	<	// there is already another CORE of the same name registered
134	<	if ( e instanceof org.omg.CosNaming.NamingContextPackage.AlreadyBound) {
135	<	System.err.println("CORE ERROR: Another I-Scream CORE is already registered under the same name.");
136	<
137	<	// otherwise we don't know what happened
138	<	// so print the error and do a stack trace if debug is enabled
139	<	} else {
140	<	System.err.println("CORE ERROR: " + e.getMessage());
141	<	if (Integer.parseInt(System.getProperty("uk.ac.ukc.iscream.Verbosity")) == Logger.DEBUG) {
142	<	System.err.println("*** DEBUG ENABLED - printing stack trace ***");
143	<	e.printStackTrace(System.out);
144	<	}
145	<	}
146	<	}
65	>	// get a reference to the servant as a Logger
66	>	_logger = _refman.getLogger();
67	>
68	>	// create the Configurator
69	>	ConfigurationManagerServant configManRef = new ConfigurationManagerServant();
70	>
71	>	// and advertise it to the naming context
72	>	_refman.bindToOrb(configManRef, "iscream.ConfigurationManager");
73	>
74	>	_logger.write(toString(), Logger.SYSINIT, "started");
75		}
76
77	<	/**
78	<	* A simple method to print the usage of this class.
79	<	* It never returns, but instead exits to the system
80	<	* with a value 1, to indicate the system did not start
81	<	* properly.
77	>	/**
78	>	* Overrides the {@link java.lang.Object#toString() Object.toString()}
79	>	* method to provide clean logging (every class should have this).
80	>	*
81	>	* This uses the uk.ac.ukc.iscream.util.NameFormat class
82	>	* to format the toString()
83	>	*
84	>	* @return the name of this class and its CVS revision
85		*/
86	<	public static void usage() {
87	<	System.out.println("USAGE: java Core <option>");
88	<	System.out.println("WHERE <option>:");
89	<	System.out.println("      -l <filename> - the location of initial system properties");
90	<	System.out.println("      -h            - this help screen");
160	<	System.exit(1);
86	>	public String toString() {
87	>	return FormatName.getName(
88	>	_name,
89	>	getClass().getName(),
90	>	REVISION);
91		}
92
163	–	//---CONSTRUCTORS---
164	–
165	–	//---PUBLIC METHODS---
166	–
93		//---PRIVATE METHODS---
94
95		//---ACCESSOR/MUTATOR METHODS---
96
97		//---ATTRIBUTES---
98	<
173	<	//---STATIC ATTRIBUTES---
174	<
98	>
99		/**
100	<	* Default logger, to be used when one is not provided
101	<	* in the configuration.
100	>	* This is the friendly identifier of the
101	>	* component this class is running in.
102	>	* eg, a Filter may be called "filter1",
103	>	* If this class does not have an owning
104	>	* component,  a name from the configuration
105	>	* can be placed here.  This name could also
106	>	* be changed to null for utility classes.
107		*/
108	<	private static final String defaultLogger = "ScreenLogger";
109	<
108	>	private String _name = Core.NAME;
109	>
110		/**
111	<	* Default configPath, to be used when one is not provided
112	<	* in the configuration.
111	>	* This holds a reference to the
112	>	* system logger that is being used.
113		*/
114	<	private static final String defaultConfigPath = ".";
114	>	private Logger _logger;
115	>
116	>	/**
117	>	* A reference to the reference manager in use
118	>	*/
119	>	private ReferenceManager _refman = ReferenceManager.getInstance();
120	>
121	>	//---STATIC ATTRIBUTES---
122
123		}

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