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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 1.7 by tdb, Thu Nov 16 15:24:32 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.*;
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 26 | Line 44 | class Core {
44		*/
45		public static final String REVISION = "$Revision$";
46
47	+	/**
48	+	* The friendly name for this component, used by
49	+	* all related classes.
50	+	*/
51	+	public static final String NAME = "Core";
52	+
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		*
36	–	* @param args the command line arguments
64		*/
65	<	public static void main(String[] args) {
66	<	System.setProperty("org.omg.CORBA.ORBClass","jacorb.orb.ORB");
40	<	System.setProperty("org.omg.CORBA.ORBSingletonClass","jacorb.orb.ORBSingleton");
41	<
42	<	System.out.println("--- I-Scream ---");
65	>	public void start() throws ComponentStartException {
66	>	// start and bind each server in turn
67
68	<	// can't have a real toString() :)
69	<	String toString = "CORE(" + REVISION.substring(11, REVISION.length() - 2) + ")";
70	<
71	<	System.out.println(toString + ": coming up");
72	<
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	<	// start the ORB
51	<	ORB orb = ORB.init(args, null);
52	<
53	<	// get the Root POA
54	<	org.omg.CORBA.Object objRef = orb.resolve_initial_references("RootPOA");
55	<	POA poa = POAHelper.narrow(objRef);
56	<
57	<	// get a hook to the name service
58	<	objRef = orb.resolve_initial_references("NameService");
59	<	NamingContextExt ncRef = NamingContextExtHelper.narrow(objRef);
60	<
61	<	// start and bind each server in turn
62	<
63	<	// create the logger (either Screen or File)
64	<	ScreenLoggerServant loggerRef = new ScreenLoggerServant(3);
65	<	//FileLoggerServant loggerRef = new FileLoggerServant("core.log");
66	<	// and advertise it to the naming context
67	<	objRef = poa.servant_to_reference(loggerRef);
68	<	ncRef.bind(ncRef.to_name("iscream.Logger"), objRef);
69	<
70	<	// get a ref to the logger servant as a Logger reference
71	<	Logger logRef = LoggerHelper.narrow(objRef);
72	<
73	<	// create the Configurator
74	<	ConfiguratorServant configuratorRef = new ConfiguratorServant(poa, logRef);
75	<	// and advertise it to the naming context
76	<	objRef = poa.servant_to_reference(configuratorRef);
77	<	ncRef.bind(ncRef.to_name("iscream.Configurator"), objRef);
78	<
79	<	// start the POA off
80	<	poa.the_POAManager().activate();
81	<
82	<	logRef.write(toString, "started");
83	<
84	<	// now we are running, we just need to serve
85	<	// so we ask the orb to block for us until it has finished
86	<	orb.run();
87	<
88	<	// if there was a problem then we'll get to here
75	>	loggerImplRef = (LoggerImpl) ClassLoader.getSystemClassLoader().loadClass(loggerPackage + "." + whichLogger).newInstance();
76		} catch (Exception e) {
77	<
78	<	// there is already another CORE of the same name registered
92	<	if ( e instanceof org.omg.CosNaming.NamingContextPackage.AlreadyBound) {
93	<	System.err.println("ERROR: Another I-Scream CORE is already registered under the same name.");
94	<
95	<	// otherwise we don't know what happened
96	<	// so print the error and do a stack trace
97	<	} else {
98	<	System.err.println("CORE ERROR: " + e);
99	<	e.printStackTrace(System.out);
100	<	}
77	>	// if anything goes wrong we throw a failed start exception
78	>	throw new ComponentStartException("unable to load logging class");
79		}
102	–	}
80
81	<	//---CONSTRUCTORS---
81	>	// setup and bind the LoggerServant
82	>	LoggerServant loggerRef = new LoggerServant(loggerImplRef);
83	>	_refman.bindToOrb(loggerRef, "iscream.Logger");
84
85	<	//---PUBLIC METHODS---
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	+	* 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 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	+
125		//---PRIVATE METHODS---
126
127		//---ACCESSOR/MUTATOR METHODS---
128
129		//---ATTRIBUTES---
130
131	+	/**
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 String _name = Core.NAME;
141	+
142	+	/**
143	+	* This holds a reference to the
144	+	* system logger that is being used.
145	+	*/
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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