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root/i-scream/projects/cms/source/server/uk/org/iscream/cms/server/rootfilter/RootFilter.java

Comparing projects/cms/source/server/uk/org/iscream/cms/server/rootfilter/RootFilter.java (file contents):
Revision 1.2 by tdb, Tue Nov 21 22:33:24 2000 UTC vs.
Revision 1.10 by ajm, Tue Dec 12 19:54:55 2000 UTC

#	Line 1 | Line 1
1		//---PACKAGE DECLARATION---
2	+	package uk.ac.ukc.iscream.rootfilter;
3
4		//---IMPORTS---
5	+	import uk.ac.ukc.iscream.util.*;
6		import uk.ac.ukc.iscream.core.*;
7	<	import uk.ac.ukc.iscream.filter.*;
6	<	import org.omg.CORBA.*;
7	<	import org.omg.CosNaming.*;
8	<	import org.omg.PortableServer.*;
7	>	import uk.ac.ukc.iscream.clientinterface.*;
8
9		/**
10	<	* A RootFilter Startup Class
10	>	* The root filter is what all filters talk to
11	>	* Hosts cannot talk to this implementation of a filter.
12	>	* It provides hooks to all data interfaces for the system
13	>	* namely the client interface and the db interface.
14	>	* This is an i-scream component that starts the
15	>	* RootFilter services.
16		*
17		* @author  $Author$
18		* @version $Id$
19		*/
20	<	class RootFilterMain {
20	>	public class RootFilter implements uk.ac.ukc.iscream.util.Component {
21
22		//---FINAL ATTRIBUTES---
23
#	Line 21 | Line 25 | class RootFilterMain {
25		* The current CVS revision of this class
26		*/
27		public static final String REVISION = "$Revision$";
28	<
28	>
29		//---STATIC METHODS---
30
31	<	public static void main(String[] args) {
32	<	System.setProperty("org.omg.CORBA.ORBClass","jacorb.orb.ORB");
33	<	System.setProperty("org.omg.CORBA.ORBSingletonClass","jacorb.orb.ORBSingleton");
31	>	//---CONSTRUCTORS---
32	>
33	>	//---PUBLIC METHODS---
34	>
35	>	/**
36	>	* This starts the Root Filter for the system
37	>	*/
38	>	public void start() throws ComponentStartException {
39	>
40	>	_logger.write(toString(), Logger.SYSINIT, "coming up");
41	>
42	>	// configuration variables we require
43	>	String ourName = null;
44	>	String realInterface = null;
45	>	String dbInterface = null;
46
47	<	// get our name from the command line
48	<	String ourName = "";
49	<	if (args.length == 1) {
50	<	ourName = args[0];
47	>	Configuration config = _refman.getCM().getConfiguration("RootFilter");
48	>	if (config == null) {
49	>	System.err.println("CRITICAL:Unable to obtain configuration" +
50	>	"\n         Advise you check the i-scream log for more information.");
51	>	_logger.write(toString(), Logger.FATAL, "ERROR - unable to obtain configuration");
52	>	System.exit(1);
53	>	} else {
54	>	try {
55	>	ourName = config.getProperty("RootFilter.name");
56	>	realInterface = config.getProperty("RootFilter.realtimeInterfaceName");
57	>	dbInterface = config.getProperty("RootFilter.dbInterfaceName");
58	>	} catch (org.omg.CORBA.MARSHAL e) {
59	>	System.err.println ("CRITICAL:Unable to obtain required configuration property" +
60	>	"\n         Advise you check the i-scream log for more information.");
61	>	_logger.write(toString(), Logger.FATAL, "ERROR - required configuration property not present");
62	>	System.exit(1);
63	>	}
64		}
65	<	else {
66	<	usage();
38	<	}
65	>	// now we have the name of the Root Filter we set it
66	>	NAME = ourName;
67
68	<	// can't have a real toString() :)
41	<	String toString = "RootFilter{" + ourName + "}(" + REVISION.substring(11, REVISION.length() - 2) + ")";
42	<
43	<	try {
44	<	ORB orb = ORB.init(args, null);
45	<
46	<	// something to hold objects
47	<	org.omg.CORBA.Object objRef = null;
48	<
49	<	// get the Root POA
50	<	objRef = orb.resolve_initial_references("RootPOA");
51	<	POA poa = POAHelper.narrow(objRef);
52	<
53	<	// get a hook to the name service
54	<	objRef = orb.resolve_initial_references("NameService");
55	<	NamingContextExt ncRef = NamingContextExtHelper.narrow(objRef);
68	>	_logger.write(toString(), Logger.SYSINIT, "configured");
69
70	<	// get a ref to the ConfigurationManager, Logger & the FilterManager
71	<
72	<	objRef = ncRef.resolve(ncRef.to_name("iscream.ConfigurationManager"));
73	<	ConfigurationManager configManager = ConfigurationManagerHelper.narrow(objRef);
74	<
75	<	objRef = ncRef.resolve(ncRef.to_name("iscream.Logger"));
76	<	Logger logger = LoggerHelper.narrow(objRef);
77	<
78	<	//objRef = ncRef.resolve(ncRef.to_name("iscream.FilterManager"));
79	<	//FilterManager filterManager = FilterManagerHelper.narrow(objRef);
80	<
81	<	logger.write(toString, Logger.SYSINIT, "coming up");
82	<
83	<
84	<	// **** THIS SECTION WILL NEED CHANGING TO GET RELEVANT CONFIG
72	<	// **** Please ignore this block of code, it's just "copy/paste" :)
73	<
74	<	// get the config
75	<	Configuration myConfig = configManager.getConfiguration(ourName);
76	<
77	<	logger.write(toString, Logger.SYSINIT, "configured");
78	<
79	<	// **** END COMMENT
80	<
81	<	// **** INITIAL FILTER MANAGER COMMUNICATIONS HERE
82	<
83	<	// **** END COMMENT
84	<
85	<	logger.write(toString, Logger.SYSINIT, "starting RootFilter");
86	<
87	<	/**************************************************************
88	<	Here would be an ideal place to start another thread to do
89	<	the listening part of the Filter. Ideally it should just be
90	<	created and then run(). It may be necessary to pass some of
91	<	the following parameters into the thread by the constructor.
92	<
93	<	Logger logger
94	<	- a reference to a Logger object
95	<	FilterManager filterManager
96	<	- a reference to the system filter manager
97	<	ConfigurationManager configManager
98	<	- a reference to the system configuration manager
99	<	Configuration myConfig
100	<	- a reference to the configuration object for this
101	<	filter instance
102	<	String ourName
103	<	- our "identifier" name
104	<
105	<	**************************************************************/
106	<
107	<	// NOTE:
108	<	//   We will not need to bind to the ORB when the FilterManager
109	<	//   is running :)
110	<
111	<	// create the RootFilterServant
112	<	RootFilterServant rfServant = new RootFilterServant(logger, ourName);
113	<
114	<	// and advertise it to the naming context
115	<	objRef = poa.servant_to_reference(rfServant);
116	<	ncRef.bind(ncRef.to_name("iscream.Filter."+ourName), objRef);
117	<
118	<	// start the POA off
119	<	poa.the_POAManager().activate();
120	<
121	<	logger.write(toString, Logger.SYSINIT, "started");
122	<
123	<	// now we are running, we just need to serve
124	<	// so we ask the orb to block for us until it has finished
125	<	orb.run();
126	<
127	<	} catch (Exception e) {
128	<	System.err.println("FILTER ERROR: " + e);
129	<	e.printStackTrace(System.out);
130	<	}
70	>	// get reference to the client interfaces - the real time one
71	>	ClientInterface ciReal = ClientInterfaceHelper.narrow(_refman.getCORBARef("iscream.ClientInterface." + realInterface));
72	>	// get reference to the client interfaces - and the db one
73	>	ClientInterface ciDB = ClientInterfaceHelper.narrow(_refman.getCORBARef("iscream.ClientInterface." + dbInterface));
74	>	_logger.write(toString(), Logger.DEBUG, "hooked to interfaces - " + realInterface + " & " + dbInterface);
75	>
76	>	ClientInterface[] clientInterfaces = {ciReal, ciDB};
77	>
78	>	// RootFilterServant start (for inbound child filter data)
79	>	_logger.write(toString(), Logger.DEBUG, "starting Root Filter");
80	>	RootFilterServant filterServant = new RootFilterServant(clientInterfaces);
81	>	// bind to the naming service as a filter
82	>	_refman.bindToOrb(filterServant, "iscream.Filter." + _name);
83	>
84	>	_logger.write(toString(), Logger.SYSINIT, "started");
85		}
86	<
87	<	/**
88	<	* A simple method to print the usage of this class.
89	<	* It never returns, but instead exits to the system
90	<	* with a value 1, to indicate the system did not start
91	<	* properly.
86	>
87	>	/**
88	>	* Overrides the {@link java.lang.Object#toString() Object.toString()}
89	>	* method to provide clean logging (every class should have this).
90	>	*
91	>	* This uses the uk.ac.ukc.iscream.util.NameFormat class
92	>	* to format the toString()
93	>	*
94	>	* @return the name of this class and its CVS revision
95		*/
96	<	public static void usage() {
97	<	System.out.println("USAGE: java RootFilter <name>");
98	<	System.out.println("WHERE <name>:");
99	<	System.out.println("      The unique identifier for the RootFilter in the system.");
100	<	System.exit(1);
96	>	public String toString() {
97	>	return FormatName.getName(
98	>	_name,
99	>	getClass().getName(),
100	>	REVISION);
101		}
102
146	–	//---CONSTRUCTORS---
147	–
148	–	//---PUBLIC METHODS---
149	–
103		//---PRIVATE METHODS---
104
105		//---ACCESSOR/MUTATOR METHODS---
106
107		//---ATTRIBUTES---
108
109	+	/**
110	+	* This is the friendly identifier of the
111	+	* component this class is running in.
112	+	* eg, a Filter may be called "filter1",
113	+	* If this class does not have an owning
114	+	* component,  a name from the configuration
115	+	* can be placed here.  This name could also
116	+	* be changed to null for utility classes.
117	+	*/
118	+	private String _name = RootFilter.NAME;
119	+
120	+	/**
121	+	* This holds a reference to the
122	+	* system logger that is being used.
123	+	*/
124	+	private Logger _logger = ReferenceManager.getInstance().getLogger();
125	+
126	+	/**
127	+	* A reference to the reference manager in use
128	+	*/
129	+	private ReferenceManager _refman = ReferenceManager.getInstance();
130	+
131		//---STATIC ATTRIBUTES---
132	+
133	+	/**
134	+	* The friendly name for this component, used by
135	+	* all related classes.
136	+	* This is set from the configuration.
137	+	*/
138	+	public static String NAME;
139
140	<	}
140	>	}

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