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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 1.4 by tdb, Thu Nov 30 02:42:56 2000 UTC vs.
Revision 1.29 by tdb, Wed Mar 14 01:34:34 2001 UTC

#	Line 1 | Line 1
1	+
2		//---PACKAGE DECLARATION---
3		package uk.ac.ukc.iscream.rootfilter;
4
5		//---IMPORTS---
5	–	import uk.ac.ukc.iscream.core.*;
6	–	import uk.ac.ukc.iscream.filter.*;
7	–	import org.omg.CORBA.*;
8	–	import org.omg.CosNaming.*;
9	–	import org.omg.PortableServer.*;
6		import uk.ac.ukc.iscream.util.*;
7	+	import uk.ac.ukc.iscream.core.*;
8	+	import uk.ac.ukc.iscream.componentmanager.*;
9	+	import uk.ac.ukc.iscream.clientinterface.*;
10
11		/**
12	<	* A RootFilter Startup Class
12	>	* The root filter is what all filters talk to
13	>	* Hosts cannot talk to this implementation of a filter.
14	>	* It provides hooks to all data interfaces for the system
15	>	* namely the client interface and the db interface.
16	>	* This is an i-scream component that starts the
17	>	* RootFilter services.
18		*
19		* @author  $Author$
20		* @version $Id$
21		*/
22	<	class RootFilterMain {
22	>	public class RootFilter implements Component {
23
24		//---FINAL ATTRIBUTES---
25
#	Line 23 | Line 27 | class RootFilterMain {
27		* The current CVS revision of this class
28		*/
29		public static final String REVISION = "$Revision$";
30	<
30	>
31		//---STATIC METHODS---
32
33	<	public static void main(String[] args) {
34	<	System.setProperty("org.omg.CORBA.ORBClass","jacorb.orb.ORB");
35	<	System.setProperty("org.omg.CORBA.ORBSingletonClass","jacorb.orb.ORBSingleton");
33	>	//---CONSTRUCTORS---
34	>
35	>	//---PUBLIC METHODS---
36	>
37	>	/**
38	>	* This starts the Root Filter for the system
39	>	*/
40	>	public void start() throws ComponentStartException {
41	>	// get references to key objects
42	>	_refman = ReferenceManager.getInstance();
43	>	_logger = ReferenceManager.getInstance().getLogger();
44
45	<	// get our name from the command line
46	<	String ourName = "";
47	<	if (args.length == 1) {
48	<	ourName = args[0];
45	>	_logger.write(toString(), Logger.SYSINIT, "coming up");
46	>
47	>	ConfigurationProxy cp = ConfigurationProxy.getInstance();
48	>	String configName = "RootFilter";
49	>
50	>	// set the name of the root filter
51	>	try {
52	>	NAME = cp.getProperty(configName, "RootFilter.name");
53	>	} catch (PropertyNotFoundException e) {
54	>	NAME = null;
55	>	_logger.write(toString(), Logger.WARNING, "RootFilter name not set: "+e);
56		}
57	<	else {
58	<	usage();
57	>
58	>	// try and get the names of the ciReal and ciDB
59	>	String realInterface, dbInterface;
60	>	try {
61	>	realInterface = cp.getProperty(configName, "RootFilter.realtimeInterfaceName");
62	>	dbInterface = cp.getProperty(configName, "RootFilter.dbInterfaceName");
63	>	} catch (PropertyNotFoundException e) {
64	>	_logger.write(toString(), Logger.DEBUG, "Optional config not set: "+e);
65	>	realInterface = null;
66	>	dbInterface = null;
67		}
68
69	<	// can't have a real toString() :)
70	<	String toString = "RootFilter{" + ourName + "}(" + REVISION.substring(11, REVISION.length() - 2) + ")";
69	>	ClientInterface ciReal = null, ciDB = null;
70	>	// get reference to the client interfaces - the real time one
71	>	if (realInterface != null) {
72	>	ciReal = ClientInterfaceHelper.narrow(_refman.getCORBARef("iscream.ClientInterface." + realInterface));
73	>	}
74	>	// get reference to the client interfaces - and the db one
75	>	if (dbInterface != null) {
76	>	ciDB = ClientInterfaceHelper.narrow(_refman.getCORBARef("iscream.ClientInterface." + dbInterface));
77	>	}
78	>
79	>	// setup a queue
80	>	Queue queue = new Queue();
81
82	<	try {
83	<	ORB orb = ORB.init(args, null);
84	<
85	<	// something to hold objects
86	<	org.omg.CORBA.Object objRef = null;
87	<
88	<	// get the Root POA
89	<	objRef = orb.resolve_initial_references("RootPOA");
90	<	POA poa = POAHelper.narrow(objRef);
91	<
92	<	// get a hook to the name service
93	<	objRef = orb.resolve_initial_references("NameService");
94	<	NamingContextExt ncRef = NamingContextExtHelper.narrow(objRef);
82	>	// startup a monitor on this queue
83	>	try {
84	>	// try to get the interval, if this fails, we won't start up the monitor
85	>	int queueMonitorInterval = Integer.parseInt(cp.getProperty(configName, "Queue.MonitorInterval"));
86	>	String queueName = NAME + " RootFilter";
87	>	queue.startMonitor(queueMonitorInterval*1000, queueName);
88	>	} catch (PropertyNotFoundException e) {
89	>	_logger.write(toString(), Logger.WARNING, "failed to find queue monitor config, disabling. " + e);
90	>	}
91	>
92	>	if (realInterface == null) {
93	>	_logger.write(toString(), Logger.DEBUG, "hooked to interfaces - " + dbInterface);
94	>	CIWrapper c = new CIWrapper(ciDB, queue);
95	>	c.start();
96	>	} else if (dbInterface == null) {
97	>	_logger.write(toString(), Logger.DEBUG, "hooked to interfaces - " + realInterface);
98	>	CIWrapper c = new CIWrapper(ciReal, queue);
99	>	c.start();
100	>	} else {
101	>	_logger.write(toString(), Logger.DEBUG, "hooked to interfaces - " + realInterface + " & " + dbInterface);
102	>	CIWrapper c = new CIWrapper(ciReal, queue);
103	>	c.start();
104	>	c = new CIWrapper(ciDB, queue);
105	>	c.start();
106	>	}
107
108	<	// get a ref to the ConfigurationManager, Logger & the FilterManager
109	<
110	<	objRef = ncRef.resolve(ncRef.to_name("iscream.ConfigurationManager"));
111	<	ConfigurationManager configManager = ConfigurationManagerHelper.narrow(objRef);
112	<
113	<	objRef = ncRef.resolve(ncRef.to_name("iscream.Logger"));
114	<	Logger logger = LoggerHelper.narrow(objRef);
115	<
116	<	//objRef = ncRef.resolve(ncRef.to_name("iscream.FilterManager"));
117	<	//FilterManager filterManager = FilterManagerHelper.narrow(objRef);
118	<
119	<	logger.write(toString, Logger.SYSINIT, "coming up");
120	<
121	<
122	<	// **** THIS SECTION WILL NEED CHANGING TO GET RELEVANT CONFIG
123	<	// **** Please ignore this block of code, it's just "copy/paste" :)
124	<
125	<	// get the config
126	<	Configuration myConfig = configManager.getConfiguration(ourName);
127	<
128	<	logger.write(toString, Logger.SYSINIT, "configured");
129	<
130	<	// **** END COMMENT
131	<
132	<	// **** INITIAL FILTER MANAGER COMMUNICATIONS HERE
133	<
134	<	// **** END COMMENT
135	<
136	<	logger.write(toString, Logger.SYSINIT, "starting RootFilter");
137	<
138	<	/**************************************************************
139	<	Here would be an ideal place to start another thread to do
140	<	the listening part of the Filter. Ideally it should just be
141	<	created and then run(). It may be necessary to pass some of
142	<	the following parameters into the thread by the constructor.
94	<
95	<	Logger logger
96	<	- a reference to a Logger object
97	<	FilterManager filterManager
98	<	- a reference to the system filter manager
99	<	ConfigurationManager configManager
100	<	- a reference to the system configuration manager
101	<	Configuration myConfig
102	<	- a reference to the configuration object for this
103	<	filter instance
104	<	String ourName
105	<	- our "identifier" name
106	<
107	<	**************************************************************/
108	<
109	<	// NOTE:
110	<	//   We will not need to bind to the ORB when the FilterManager
111	<	//   is running :)
112	<
113	<	// create the RootFilterServant
114	<	RootFilterServant rfServant = new RootFilterServant(logger, ourName);
115	<
116	<	// and advertise it to the naming context
117	<	objRef = poa.servant_to_reference(rfServant);
118	<	ncRef.bind(ncRef.to_name("iscream.Filter."+ourName), objRef);
119	<
120	<	// start the POA off
121	<	poa.the_POAManager().activate();
122	<
123	<	logger.write(toString, Logger.SYSINIT, "started");
124	<
125	<	// now we are running, we just need to serve
126	<	// so we ask the orb to block for us until it has finished
127	<	orb.run();
128	<
129	<	} catch (Exception e) {
130	<	System.err.println("FILTER ERROR: " + e);
131	<	e.printStackTrace(System.out);
108	>	// RootFilterServant start (for inbound child filter data)
109	>	_logger.write(toString(), Logger.DEBUG, "starting Root Filter");
110	>	RootFilterServant filterServant = new RootFilterServant(queue);
111	>	// bind to the naming service as a filter
112	>	_refman.bindToOrb(filterServant, "iscream.Filter." + RootFilter.NAME);
113	>
114	>	_logger.write(toString(), Logger.SYSINIT, "started");
115	>
116	>	}
117	>
118	>	/**
119	>	* Does a dependency check. Used mainly at startup to
120	>	* see if the required dependencies (components) are up
121	>	* and running.
122	>	*
123	>	* @return a boolean value, true if the depdencies are satisfied
124	>	*/
125	>	public boolean depCheck() {
126	>	try {
127	>	org.omg.CORBA.Object obj;
128	>	// first check the ConfigurationManager is alive
129	>	obj = _refman.getCORBARef("iscream.ConfigurationManager");
130	>	// then get some info on the CLI and DBI
131	>	ConfigurationProxy cp = ConfigurationProxy.getInstance();
132	>	String cli = cp.getProperty("RootFilter", "RootFilter.realtimeInterfaceName");
133	>	String dbi = cp.getProperty("RootFilter", "RootFilter.dbInterfaceName");
134	>	// finally check the CLI and DBI are alive
135	>	obj = _refman.getCORBARef("iscream.ClientInterface." + cli);
136	>	obj = _refman.getCORBARef("iscream.ClientInterface." + dbi);
137	>	} catch(ComponentCORBAException e) {
138	>	_logger.write(toString(), Logger.WARNING, "Dependency Failure: "+e);
139	>	return false;
140	>	} catch(PropertyNotFoundException e) {
141	>	_logger.write(toString(), Logger.WARNING, "Unable to obtain configuration: "+e);
142	>	return false;
143		}
144	+	// dependency check suceeded
145	+	return true;
146		}
147	<
148	<	/**
149	<	* A simple method to print the usage of this class.
150	<	* It never returns, but instead exits to the system
151	<	* with a value 1, to indicate the system did not start
152	<	* properly.
147	>
148	>	/**
149	>	* Overrides the {@link java.lang.Object#toString() Object.toString()}
150	>	* method to provide clean logging (every class should have this).
151	>	*
152	>	* This uses the uk.ac.ukc.iscream.util.NameFormat class
153	>	* to format the toString()
154	>	*
155	>	* @return the name of this class and its CVS revision
156		*/
157	<	public static void usage() {
158	<	System.out.println("USAGE: java RootFilter <name>");
159	<	System.out.println("WHERE <name>:");
160	<	System.out.println("      The unique identifier for the RootFilter in the system.");
161	<	System.exit(1);
157	>	public String toString() {
158	>	return FormatName.getName(
159	>	NAME,
160	>	getClass().getName(),
161	>	REVISION);
162		}
163
148	–	//---CONSTRUCTORS---
149	–
150	–	//---PUBLIC METHODS---
151	–
164		//---PRIVATE METHODS---
165
166		//---ACCESSOR/MUTATOR METHODS---
167
168		//---ATTRIBUTES---
169
170	+	/**
171	+	* This holds a reference to the
172	+	* system logger that is being used.
173	+	*/
174	+	private Logger _logger;
175	+
176	+	/**
177	+	* A reference to the reference manager in use
178	+	*/
179	+	private ReferenceManager _refman;
180	+
181		//---STATIC ATTRIBUTES---
182	+
183	+	/**
184	+	* The friendly name for this component, used by
185	+	* all related classes.
186	+	* This is set from the configuration.
187	+	*/
188	+	public static String NAME;
189
190	<	}
190	>	}

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