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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 1.26 by tdb, Sat May 18 18:16:01 2002 UTC

#	Line 1 | Line 1
1	+	/*
2	+	* i-scream central monitoring system
3	+	* Copyright (C) 2000-2002 i-scream
4	+	*
5	+	* This program is free software; you can redistribute it and/or
6	+	* modify it under the terms of the GNU General Public License
7	+	* as published by the Free Software Foundation; either version 2
8	+	* of the License, or (at your option) any later version.
9	+	*
10	+	* This program is distributed in the hope that it will be useful,
11	+	* but WITHOUT ANY WARRANTY; without even the implied warranty of
12	+	* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
13	+	* GNU General Public License for more details.
14	+	*
15	+	* You should have received a copy of the GNU General Public License
16	+	* along with this program; if not, write to the Free Software
17	+	* Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA  02111-1307, USA.
18	+	*/
19	+
20		//---PACKAGE DECLARATION---
21	+	package uk.org.iscream.cms.server.core;
22
23		//---IMPORTS---
24	<	import uk.ac.ukc.iscream.core.*;
25	<	import org.omg.CORBA.*;
6	<	import org.omg.CosNaming.*;
7	<	import org.omg.PortableServer.*;
8	<	import java.util.*;
9	<	import java.io.*;
24	>	import uk.org.iscream.cms.server.util.*;
25	>	import uk.org.iscream.cms.server.componentmanager.*;
26
27		/**
28		* The main class for the CORE of the I-Scream system.
29	<	* The main method of this class initialises the ORB
30	<	* and then starts and registers CORE I-Scream services
31	<	* with the name service.  At which point it essentially
29	>	* This class is the component for CORE I-Scream services
30	>	* namely the Logger and the ConfigurationManager.
31	>	* It registers and starts them, at which point it essentially
32		* finishs its role and the started services continue to
33		* serve requests from the I-Scream system.
34		*
35		* @author  $Author$
36		* @version $Id$
37		*/
38	<	class Core {
38	>	public class Core implements Component {
39
40		//---FINAL ATTRIBUTES---
41
#	Line 29 | Line 45 | class Core {
45		public static final String REVISION = "$Revision$";
46
47		/**
48	<	* The toString() of this class
49	<	* As it won't be instatiated, this is needed.
48	>	* The friendly name for this component, used by
49	>	* all related classes.
50		*/
51	<	public static final String toString = "CORE(" + REVISION.substring(11, REVISION.length() - 2) + ")";
51	>	public static final String NAME = "Core";
52
37	–	/**
38	–	* The default location of the properties file for the system
39	–	*/
40	–	public static final String DEFAULTPROPERTIES = "default.properties";
41	–
53		//---STATIC METHODS---
54
55	+	//---CONSTRUCTORS---
56	+
57	+	//---PUBLIC METHODS---
58	+
59		/**
60	<	* The main method which starts the CORE
60	>	* This method starts the CORE
61		* Currently the args are passed direct to the ORB,
62		* so any ORB paramaters could go there.
63		*
49	–	* @param args the command line arguments
64		*/
65	<	public static void main(String[] args) {
66	<	System.out.println("--- I-Scream ---");
67	<
68	<	// get the command line args
69	<	String defaultProperties = DEFAULTPROPERTIES;
70	<	if (args.length > 0) {
71	<	if (args[0].equals("-l")) {
72	<	defaultProperties = args[1];
73	<	} 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);
65	>	public void start() throws ComponentStartException {
66	>	// start and bind each server in turn
67	>
68	>	// work out which logger to use
69	>	String whichLogger = System.getProperty("uk.org.iscream.cms.server.LoggerClass");
70	>	String loggerPackage = System.getProperty("uk.org.iscream.cms.server.LoggerPackage");
71	>
72	>	// construct the relevant LoggerImpl
73	>	LoggerImpl loggerImplRef = null;
74		try {
75	<	Properties initProperties = new Properties(System.getProperties());
70	<	initProperties.load(new FileInputStream(new File(defaultProperties)));
71	<	System.setProperties(initProperties);
72	<
73	<
75	>	loggerImplRef = (LoggerImpl) ClassLoader.getSystemClassLoader().loadClass(loggerPackage + "." + whichLogger).newInstance();
76		} catch (Exception e) {
77	<	System.err.println(toString + ": ERROR " + e.getMessage());
78	<	usage();
77	>	// if anything goes wrong we throw a failed start exception
78	>	throw new ComponentStartException("unable to load logging class");
79		}
80
81	<	// continue to bring the system up
82	<	System.out.println(toString + ": coming up");
83	<	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);
81	>	// setup and bind the LoggerServant
82	>	LoggerServant loggerRef = new LoggerServant(loggerImplRef);
83	>	_refman.bindToOrb(loggerRef, "iscream.Logger");
84
85	<	// create the Configurator
86	<	ConfigurationManagerServant configManRef = new ConfigurationManagerServant(poa, logRef);
87	<
88	<	// and advertise it to the naming context
89	<	objRef = poa.servant_to_reference(configManRef);
90	<	ncRef.bind(ncRef.to_name("iscream.ConfigurationManager"), objRef);
91	<
92	<	// start the POA off
93	<	poa.the_POAManager().activate();
94	<
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	<	}
85	>	// get a reference to the servant as a Logger
86	>	_logger = _refman.getLogger();
87	>
88	>	// create the Configurator
89	>	ConfigurationManagerServant configManRef = new ConfigurationManagerServant();
90	>
91	>	// and advertise it to the naming context
92	>	_refman.bindToOrb(configManRef, "iscream.ConfigurationManager");
93	>
94	>	_logger.write(toString(), Logger.SYSINIT, "started");
95		}
96
97	<	/**
98	<	* A simple method to print the usage of this class.
99	<	* It never returns, but instead exits to the system
100	<	* with a value 1, to indicate the system did not start
101	<	* properly.
97	>	/**
98	>	* Does a dependency check. Used mainly at startup to
99	>	* see if the required dependencies (components) are up
100	>	* and running.
101	>	*
102	>	* @return a boolean value, true if the depdencies are satisfied
103		*/
104	<	public static void usage() {
105	<	System.out.println("USAGE: java Core <option>");
106	<	System.out.println("WHERE <option>:");
158	<	System.out.println("      -l <filename> - the location of initial system properties");
159	<	System.out.println("      -h            - this help screen");
160	<	System.exit(1);
104	>	public boolean depCheck() {
105	>	// the core has no depedencies
106	>	return true;
107		}
108	+
109	+	/**
110	+	* Overrides the {@link java.lang.Object#toString() Object.toString()}
111	+	* method to provide clean logging (every class should have this).
112	+	*
113	+	* This uses the uk.org.iscream.cms.server.util.NameFormat class
114	+	* to format the toString()
115	+	*
116	+	* @return the name of this class and its CVS revision
117	+	*/
118	+	public String toString() {
119	+	return FormatName.getName(
120	+	_name,
121	+	getClass().getName(),
122	+	REVISION);
123	+	}
124
163	–	//---CONSTRUCTORS---
164	–
165	–	//---PUBLIC METHODS---
166	–
125		//---PRIVATE METHODS---
126
127		//---ACCESSOR/MUTATOR METHODS---
128
129		//---ATTRIBUTES---
130	<
173	<	//---STATIC ATTRIBUTES---
174	<
130	>
131		/**
132	<	* Default logger, to be used when one is not provided
133	<	* in the configuration.
132	>	* This is the friendly identifier of the
133	>	* component this class is running in.
134	>	* eg, a Filter may be called "filter1",
135	>	* If this class does not have an owning
136	>	* component,  a name from the configuration
137	>	* can be placed here.  This name could also
138	>	* be changed to null for utility classes.
139		*/
140	<	private static final String defaultLogger = "ScreenLogger";
141	<
140	>	private String _name = Core.NAME;
141	>
142		/**
143	<	* Default configPath, to be used when one is not provided
144	<	* in the configuration.
143	>	* This holds a reference to the
144	>	* system logger that is being used.
145		*/
146	<	private static final String defaultConfigPath = ".";
146	>	private Logger _logger;
147	>
148	>	/**
149	>	* A reference to the reference manager in use
150	>	*/
151	>	private ReferenceManager _refman = ReferenceManager.getInstance();
152	>
153	>	//---STATIC ATTRIBUTES---
154
155		}

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