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root/i-scream/projects/cms/source/server/uk/org/iscream/cms/server/filter/FilterMain.java

Comparing projects/cms/source/server/uk/org/iscream/cms/server/filter/FilterMain.java (file contents):
Revision 1.12 by ajm, Wed Nov 29 21:27:39 2000 UTC vs.
Revision 1.27 by tdb, Wed Mar 14 01:43:52 2001 UTC

#	Line 2 | Line 2
2		package uk.ac.ukc.iscream.filter;
3
4		//---IMPORTS---
5	+	import uk.ac.ukc.iscream.util.*;
6		import uk.ac.ukc.iscream.core.*;
7	+	import uk.ac.ukc.iscream.componentmanager.*;
8		import uk.ac.ukc.iscream.filter.*;
7	–	import org.omg.CORBA.*;
8	–	import org.omg.CosNaming.*;
9	–	import org.omg.PortableServer.*;
9
10		/**
11		* A Filter Startup Class
12	+	* A filter is an iscream component.
13		*
14		* @author  $Author$
15		* @version $Id$
16		*/
17	<	class FilterMain {
17	>	public class FilterMain implements Component {
18
19		//---FINAL ATTRIBUTES---
20
#	Line 25 | Line 25 | class FilterMain {
25
26		//---STATIC METHODS---
27
28	<	public static void main(String[] args) {
29	<	System.setProperty("org.omg.CORBA.ORBClass","jacorb.orb.ORB");
30	<	System.setProperty("org.omg.CORBA.ORBSingletonClass","jacorb.orb.ORBSingleton");
28	>	//---CONSTRUCTORS---
29	>
30	>	/**
31	>	* Constructs a Filter with the name given
32	>	*
33	>	* @param givenName the name
34	>	*/
35	>	public FilterMain(String givenName) {
36	>	NAME = givenName;
37	>	}
38	>
39	>	//---PUBLIC METHODS---
40	>
41	>	/**
42	>	* Starts the Filter component
43	>	*/
44	>	public void start() throws ComponentStartException {
45	>	// get references to key objects
46	>	_logger = _refman.getLogger();
47
48	<	// get our name from the command line
49	<	String ourName = "";
50	<	if (args.length == 1) {
51	<	ourName = args[0];
48	>	_logger.write(toString(), Logger.SYSINIT, "coming up");
49	>
50	>	ConfigurationProxy cp = ConfigurationProxy.getInstance();
51	>
52	>	int UDPListenPort, TCPListenPort;
53	>	try {
54	>	UDPListenPort = Integer.parseInt(cp.getProperty(FilterMain.NAME, "Filter.UDPListenPort"));
55	>	TCPListenPort = Integer.parseInt(cp.getProperty(FilterMain.NAME, "Filter.TCPListenPort"));
56	>	} catch (PropertyNotFoundException e) {
57	>	throw new ComponentStartException("Unable to obtain requried configuration property for component: " + e);
58		}
59	<	else {
60	<	usage();
59	>
60	>	// setup a queue
61	>	Queue queue = new Queue();
62	>
63	>	// startup a monitor on this queue
64	>	try {
65	>	// try to get the interval, if this fails, we won't start up the monitor
66	>	int queueMonitorInterval = Integer.parseInt(cp.getProperty(FilterMain.NAME, "Queue.MonitorInterval"));
67	>	String queueName = NAME + " Filter";
68	>	queue.startMonitor(queueMonitorInterval*1000, queueName);
69	>	} catch (PropertyNotFoundException e) {
70	>	_logger.write(toString(), Logger.WARNING, "failed to find queue monitor config, disabling. " + e);
71		}
72
73	<	// can't have a real toString() :)
74	<	String toString = "Filter{" + ourName + "}(" + REVISION.substring(11, REVISION.length() - 2) + ")";
73	>	// Start a filter thread
74	>	_logger.write(toString(), Logger.SYSINIT, "starting Filter Thread / Queue consumer");
75	>	FilterThread filterThread = new FilterThread(queue);
76	>	filterThread.start();
77
78	<	try {
79	<	ORB orb = ORB.init(args, null);
80	<
81	<	// something to hold objects
48	<	org.omg.CORBA.Object objRef = null;
49	<
50	<	// get the Root POA
51	<	objRef = orb.resolve_initial_references("RootPOA");
52	<	POA poa = POAHelper.narrow(objRef);
53	<
54	<	// get a hook to the name service
55	<	objRef = orb.resolve_initial_references("NameService");
56	<	NamingContextExt ncRef = NamingContextExtHelper.narrow(objRef);
57	<
58	<	// get a ref to the ConfigurationManager, Logger & the FilterManager
59	<
60	<	objRef = ncRef.resolve(ncRef.to_name("iscream.ConfigurationManager"));
61	<	ConfigurationManager configManager = ConfigurationManagerHelper.narrow(objRef);
62	<
63	<	objRef = ncRef.resolve(ncRef.to_name("iscream.Logger"));
64	<	Logger logger = LoggerHelper.narrow(objRef);
65	<
66	<	logger.write(toString, Logger.SYSINIT, "coming up");
67	<
68	<
69	<	// **** THIS SECTION WILL NEED CHANGING TO GET RELEVANT CONFIG
70	<	// **** Please ignore this block of code, it's just "copy/paste" :)
71	<
72	<	// get the config
73	<	Configuration myConfig = configManager.getConfiguration(ourName);
74	<
75	<	// read some config here
76	<	int UDPport = 0;
77	<	int TCPport = 0;
78	<	String parentFilterName = null;
79	<
80	<	// did we?
81	<	if (myConfig == null) {
82	<	System.out.println("Failed: is it there?, can you read it?");
83	<	System.exit(1);
84	<	} else {
85	<
86	<	// get the property
87	<	try {
88	<	//QUERY HERE.... ???
89	<	UDPport = new Integer(myConfig.getProperty("Filter.UDPlistenPort")).intValue();
90	<	TCPport = new Integer(myConfig.getProperty("Filter.TCPlistenPort")).intValue();
91	<	parentFilterName = myConfig.getProperty("Filter.parentFilter");
92	<	} catch (org.omg.CORBA.MARSHAL e) {
93	<	System.out.println("Caught org.omg.CORBA.MARSHAL, must be a null we got back");
94	<	//System.exit(1);
95	<	}
96	<	}
97	<
98	<	logger.write(toString, Logger.SYSINIT, "configured");
99	<
100	<	// **** END COMMENT
101	<
102	<	// **** INITIAL FILTER MANAGER COMMUNICATIONS HERE
103	<
104	<	// get a root (CHANGE to use FilterManager)
105	<	objRef = ncRef.resolve(ncRef.to_name("iscream.Filter." + parentFilterName));
106	<	Filter parentFilter = FilterHelper.narrow(objRef);
78	>	// FilterServant start (for inbound child filter data)
79	>	_logger.write(toString(), Logger.DEBUG, "starting Servant to listen for downstream filters");
80	>	FilterServant filterServant = new FilterServant(TCPListenPort, UDPListenPort, queue);
81	>	_refman.bindToOrb(filterServant, "iscream.Filter." + FilterMain.NAME);
82
83	<	// SETUP our Servant
84	<
85	<	// create the FilterServant
86	<	logger.write(toString, Logger.DEBUG, "firing servant with parent - " + parentFilterName);
112	<	FilterServant filterServant = new FilterServant(logger, parentFilter, ourName, new Integer(TCPport).toString() , new Integer(UDPport).toString());
83	>	// UDL Reader start (for inbound host data)
84	>	_logger.write(toString(), Logger.SYSINIT, "starting Filter UDP listener");
85	>	UDPReader udpReader = new UDPReader(UDPListenPort, queue);
86	>	udpReader.start();
87
88	<	// register ourselves
89	<
90	<	// and advertise it to the naming context
91	<	objRef = poa.servant_to_reference(filterServant);
92	<	ncRef.bind(ncRef.to_name("iscream.Filter."+ourName), objRef);
93	<
94	<	// **** END COMMENT
95	<
96	<	// END SETUP
97	<
98	<
99	<	/**************************************************************
100	<	Here would be an ideal place to start another thread to do
101	<	the listening part of the Filter. Ideally it should just be
102	<	created and then run(). It may be necessary to pass some of
103	<	the following parameters into the thread by the constructor.
104	<
105	<	Logger logger
106	<	- a reference to a Logger object
107	<	FilterManager filterManager
108	<	- a reference to the system filter manager
109	<	ConfigurationManager configManager
110	<	- a reference to the system configuration manager
111	<	Configuration myConfig
112	<	- a reference to the configuration object for this
113	<	filter instance
114	<	String ourName
115	<	- our "identifier" name
116	<
117	<	**************************************************************/
118	<
145	<	logger.write(toString, Logger.SYSINIT, "starting Filter UDP listener");
146	<	UDPReader udpReader = new UDPReader(UDPport, parentFilter, logger);
147	<	udpReader.start();
148	<	logger.write(toString, Logger.SYSINIT, "Filter UDP listener started");
149	<
150	<	logger.write(toString, Logger.SYSINIT, "starting Filter TCP listener");
151	<	TCPReader tcpReader = new TCPReader(logger, configManager, TCPport, parentFilter);
152	<	tcpReader.start();
153	<	logger.write(toString, Logger.SYSINIT, "Filter TCP listener started");
154	<
155	<	// TEST
156	<	//parentFilter.receiveXML("<?xml version=\"1.0\" encoding=\"ISO8859-1\"?><packet><test>This is just a debugging test, we ("+ourName+") are live on UDPport: "+UDPport+"</test></packet>");
157	<
158	<	// start the POA off
159	<	poa.the_POAManager().activate();
160	<
161	<	logger.write(toString, Logger.SYSINIT, "started");
162	<
163	<	// now we are running, we just need to serve
164	<	// so we ask the orb to block for us until it has finished
165	<	orb.run();
166	<
167	<	} catch (Exception e) {
168	<	System.err.println("FILTER ERROR: " + e);
169	<	e.printStackTrace(System.out);
88	>	// TCP Reader start (for heartbeats)
89	>	_logger.write(toString(), Logger.SYSINIT, "starting Filter TCP listener");
90	>	TCPReader tcpReader = new TCPReader(TCPListenPort, queue);
91	>	tcpReader.start();
92	>
93	>	_logger.write(toString(), Logger.SYSINIT, "started");
94	>	}
95	>
96	>	/**
97	>	* Does a dependency check. Used mainly at startup to
98	>	* see if the required dependencies (components) are up
99	>	* and running.
100	>	*
101	>	* @return a boolean value, true if the depdencies are satisfied
102	>	*/
103	>	public boolean depCheck() {
104	>	try {
105	>	org.omg.CORBA.Object obj;
106	>	// first check the ConfigurationManager is alive
107	>	obj = _refman.getCORBARef("iscream.ConfigurationManager");
108	>	// then suss out our parent filter
109	>	ConfigurationProxy cp = ConfigurationProxy.getInstance();
110	>	String parentFilterName = cp.getProperty(NAME, "Filter.parentFilter");
111	>	// finally check the parent filter is alive
112	>	obj = _refman.getCORBARef("iscream.Filter." + parentFilterName);
113	>	} catch(ComponentCORBAException e) {
114	>	_logger.write(toString(), Logger.WARNING, "Dependency Failure: "+e);
115	>	return false;
116	>	} catch(PropertyNotFoundException e) {
117	>	_logger.write(toString(), Logger.WARNING, "Unable to obtain configuration: "+e);
118	>	return false;
119		}
120	+	// dependency check suceeded
121	+	return true;
122		}
123	<
124	<	/**
125	<	* A simple method to print the usage of this class.
126	<	* It never returns, but instead exits to the system
127	<	* with a value 1, to indicate the system did not start
128	<	* properly.
123	>
124	>	/**
125	>	* Overrides the {@link java.lang.Object#toString() Object.toString()}
126	>	* method to provide clean logging (every class should have this).
127	>	*
128	>	* This uses the uk.ac.ukc.iscream.util.NameFormat class
129	>	* to format the toString()
130	>	*
131	>	* @return the name of this class and its CVS revision
132		*/
133	<	public static void usage() {
134	<	System.out.println("USAGE: java FilterMain <name>");
135	<	System.out.println("WHERE <name>:");
136	<	System.out.println("      The unique identifier for the Filter in the system.");
137	<	System.exit(1);
133	>	public String toString() {
134	>	return FormatName.getName(
135	>	NAME,
136	>	getClass().getName(),
137	>	REVISION);
138		}
139
186	–	//---CONSTRUCTORS---
187	–
188	–	//---PUBLIC METHODS---
189	–
140		//---PRIVATE METHODS---
141
142		//---ACCESSOR/MUTATOR METHODS---
143
144		//---ATTRIBUTES---
145
146	+	/**
147	+	* This holds a reference to the
148	+	* system logger that is being used.
149	+	*/
150	+	private Logger _logger;
151	+
152	+	/**
153	+	* A reference to the reference manager in use
154	+	*/
155	+	private ReferenceManager _refman = ReferenceManager.getInstance();
156	+
157		//---STATIC ATTRIBUTES---
158
159	<	}
159	>	/**
160	>	* The friendly name for this component, used by
161	>	* all related classes.
162	>	* This is set from the configuration.
163	>	*/
164	>	public static String NAME;
165	>
166	>	}

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