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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 1.25 by tdb, Tue May 29 17:02:34 2001 UTC

#	Line 1 | Line 1
1		//---PACKAGE DECLARATION---
2	+	package uk.org.iscream.cms.server.core;
3
4		//---IMPORTS---
5	<	import uk.ac.ukc.iscream.core.*;
6	<	import org.omg.CORBA.*;
6	<	import org.omg.CosNaming.*;
7	<	import org.omg.PortableServer.*;
5	>	import uk.org.iscream.cms.server.util.*;
6	>	import uk.org.iscream.cms.server.componentmanager.*;
7
8		/**
9		* The main class for the CORE of the I-Scream system.
10	<	* The main method of this class initialises the ORB
11	<	* and then starts and registers CORE I-Scream services
12	<	* with the name service.  At which point it essentially
10	>	* This class is the component for CORE I-Scream services
11	>	* namely the Logger and the ConfigurationManager.
12	>	* It registers and starts them, at which point it essentially
13		* finishs its role and the started services continue to
14		* serve requests from the I-Scream system.
15		*
16		* @author  $Author$
17		* @version $Id$
18		*/
19	<	class Core {
19	>	public class Core implements Component {
20
21		//---FINAL ATTRIBUTES---
22
#	Line 26 | Line 25 | class Core {
25		*/
26		public static final String REVISION = "$Revision$";
27
28	+	/**
29	+	* The friendly name for this component, used by
30	+	* all related classes.
31	+	*/
32	+	public static final String NAME = "Core";
33	+
34		//---STATIC METHODS---
35
36	+	//---CONSTRUCTORS---
37	+
38	+	//---PUBLIC METHODS---
39	+
40		/**
41	<	* The main method which starts the CORE
41	>	* This method starts the CORE
42		* Currently the args are passed direct to the ORB,
43		* so any ORB paramaters could go there.
44		*
36	–	* @param args the command line arguments
45		*/
46	<	public static void main(String[] args) {
47	<	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 ---");
46	>	public void start() throws ComponentStartException {
47	>	// start and bind each server in turn
48
49	<	// can't have a real toString() :)
50	<	String toString = "CORE(" + REVISION.substring(11, REVISION.length() - 2) + ")";
51	<
52	<	System.out.println(toString + ": coming up");
53	<
49	>	// work out which logger to use
50	>	String whichLogger = System.getProperty("uk.org.iscream.cms.server.LoggerClass");
51	>	String loggerPackage = System.getProperty("uk.org.iscream.cms.server.LoggerPackage");
52	>
53	>	// construct the relevant LoggerImpl
54	>	LoggerImpl loggerImplRef = null;
55		try {
56	<	// 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
56	>	loggerImplRef = (LoggerImpl) ClassLoader.getSystemClassLoader().loadClass(loggerPackage + "." + whichLogger).newInstance();
57		} catch (Exception e) {
58	<
59	<	// 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	<	}
58	>	// if anything goes wrong we throw a failed start exception
59	>	throw new ComponentStartException("unable to load logging class");
60		}
102	–	}
61
62	<	//---CONSTRUCTORS---
62	>	// setup and bind the LoggerServant
63	>	LoggerServant loggerRef = new LoggerServant(loggerImplRef);
64	>	_refman.bindToOrb(loggerRef, "iscream.Logger");
65
66	<	//---PUBLIC METHODS---
66	>	// get a reference to the servant as a Logger
67	>	_logger = _refman.getLogger();
68	>
69	>	// create the Configurator
70	>	ConfigurationManagerServant configManRef = new ConfigurationManagerServant();
71	>
72	>	// and advertise it to the naming context
73	>	_refman.bindToOrb(configManRef, "iscream.ConfigurationManager");
74
75	+	_logger.write(toString(), Logger.SYSINIT, "started");
76	+	}
77	+
78	+	/**
79	+	* Does a dependency check. Used mainly at startup to
80	+	* see if the required dependencies (components) are up
81	+	* and running.
82	+	*
83	+	* @return a boolean value, true if the depdencies are satisfied
84	+	*/
85	+	public boolean depCheck() {
86	+	// the core has no depedencies
87	+	return true;
88	+	}
89	+
90	+	/**
91	+	* Overrides the {@link java.lang.Object#toString() Object.toString()}
92	+	* method to provide clean logging (every class should have this).
93	+	*
94	+	* This uses the uk.org.iscream.cms.server.util.NameFormat class
95	+	* to format the toString()
96	+	*
97	+	* @return the name of this class and its CVS revision
98	+	*/
99	+	public String toString() {
100	+	return FormatName.getName(
101	+	_name,
102	+	getClass().getName(),
103	+	REVISION);
104	+	}
105	+
106		//---PRIVATE METHODS---
107
108		//---ACCESSOR/MUTATOR METHODS---
109
110		//---ATTRIBUTES---
111
112	+	/**
113	+	* This is the friendly identifier of the
114	+	* component this class is running in.
115	+	* eg, a Filter may be called "filter1",
116	+	* If this class does not have an owning
117	+	* component,  a name from the configuration
118	+	* can be placed here.  This name could also
119	+	* be changed to null for utility classes.
120	+	*/
121	+	private String _name = Core.NAME;
122	+
123	+	/**
124	+	* This holds a reference to the
125	+	* system logger that is being used.
126	+	*/
127	+	private Logger _logger;
128	+
129	+	/**
130	+	* A reference to the reference manager in use
131	+	*/
132	+	private ReferenceManager _refman = ReferenceManager.getInstance();
133	+
134		//---STATIC ATTRIBUTES---
135
136		}

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