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root/i-scream/projects/cms/source/server/uk/org/iscream/cms/server/filtermanager/HostInit.java

Comparing projects/cms/source/server/uk/org/iscream/cms/server/filtermanager/HostInit.java (file contents):
Revision 1.1 by tdb, Mon Nov 13 20:40:40 2000 UTC vs.
Revision 1.36 by tdb, Wed Feb 26 17:16:30 2003 UTC

#	Line 1 | Line 1
1	+	/*
2	+	* i-scream central monitoring system
3	+	* http://www.i-scream.org.uk
4	+	* Copyright (C) 2000-2002 i-scream
5	+	*
6	+	* This program is free software; you can redistribute it and/or
7	+	* modify it under the terms of the GNU General Public License
8	+	* as published by the Free Software Foundation; either version 2
9	+	* of the License, or (at your option) any later version.
10	+	*
11	+	* This program is distributed in the hope that it will be useful,
12	+	* but WITHOUT ANY WARRANTY; without even the implied warranty of
13	+	* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
14	+	* GNU General Public License for more details.
15	+	*
16	+	* You should have received a copy of the GNU General Public License
17	+	* along with this program; if not, write to the Free Software
18	+	* Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA  02111-1307, USA.
19	+	*/
20	+
21		//---PACKAGE DECLARATION---
22	+	package uk.org.iscream.cms.server.filtermanager;
23
24		//---IMPORTS---
25	<	import uk.ac.ukc.iscream.core.*;
26	<	import java.net.Socket;
27	<	import java.io.InputStream;
28	<	import java.io.OutputStream;
29	<	import java.io.IOException;
25	>	import uk.org.iscream.cms.server.core.*;
26	>	import uk.org.iscream.cms.server.filter.*;
27	>	import uk.org.iscream.cms.util.*;
28	>	import uk.org.iscream.cms.server.componentmanager.*;
29	>	import java.net.*;
30		import java.io.*;
31	+	import java.util.*;
32
33		/**
34	<	* <ONE LINE DESCRIPTION>
35	<	* <DETAILED DESCRIPTION>
34	>	* Handles setting up a host.
35	>	* This class provides a host with appropriate configuration
36	>	* and a reference to a Filter to which it should pass data.
37		*
38		* @author  $Author$
39		* @version $Id$
#	Line 28 | Line 51 | class HostInit extends Thread {
51
52		//---CONSTRUCTORS---
53
54	<	public HostInit(Socket socket, Configurator configurator, Logger logger) throws IOException {
55	<	_configurator = configurator;
56	<	_logger = logger;
54	>	/**
55	>	* Construct a new HostInit.
56	>	*
57	>	* @param socket The socket to which the host is connected
58	>	*/
59	>	public HostInit(Socket socket) throws IOException {
60	>	// set the Thread name
61	>	setName("filtermanager.HostInit");
62	>
63		_socket = socket;
64	+	// setup reader & writer
65		_socketIn = new BufferedReader(new InputStreamReader(_socket.getInputStream()));
66	<	_socketOut = new PrintWriter(_socket.getOutputStream());
67	<	_logger.write(toString(), "created");
66	>	_socketOut = new PrintWriter(_socket.getOutputStream(), true);
67	>	_logger.write(toString(), Logger.SYSINIT, "created");
68		}
69
70		//---PUBLIC METHODS---
71
72	+	/**
73	+	* Main method in this class, which handles communicating with
74	+	* the host to determine it's setup.
75	+	*/
76		public void run() {
77	+	// get a hook on the config proxy
78	+	ConfigurationProxy cp = ConfigurationProxy.getInstance();
79	+	// this is our config name
80	+	String configName = "Host." + _socket.getInetAddress().getHostName().toLowerCase();
81		try {
82	<	String inBound = _socketIn.readLine();
83	<	if (!inBound.equals("STARTCONFIG")) {
84	<	_socketOut.println("ERROR");
85	<	_socketOut.flush();
86	<	throw new IOException("Protocol Error");
87	<	}
88	<
89	<	Configuration myConfig = _configurator.getConfiguration(_socket.getInetAddress().getHostName().toLowerCase());
90	<	if (myConfig == null) {
91	<	_socketOut.println("ERROR");
92	<	throw new IOException("No Configuration File For Host");
93	<	} else {
94	<	_socketOut.println("OK");
95	<	_socketOut.flush();
96	<
97	<	inBound = _socketIn.readLine();
98	<	while(!inBound.equals("ENDCONFIG")) {
99	<
100	<	// get the property
101	<	try {
102	<	String returnedProperty = myConfig.getProperty(inBound);
103	<
104	<	_socketOut.println(returnedProperty);
105	<	_socketOut.flush();
106	<
107	<	} catch (org.omg.CORBA.MARSHAL e) {
82	>	// look for a command:
83	>	// STARTCONFIG - to get a configuration
84	>	// CHECKCONFIG - to check a configuration
85	>	// END - to finish
86	>	String cmd = getInBound();
87	>	while(!cmd.equals("END")) {
88	>	if(cmd.equals("STARTCONFIG")) {
89	>	// respond to STARTCONFIG
90	>	_socketOut.println("OK");
91	>
92	>	// try for LASTMODIFIED
93	>	getInBound("LASTMODIFIED");
94	>	_socketOut.println(cp.getLastModified(configName));
95	>
96	>	// try for FILELIST
97	>	getInBound("FILELIST");
98	>	_socketOut.println(cp.getFileList(configName));
99	>
100	>	// try for FQDN
101	>	getInBound("FQDN");
102	>	_socketOut.println(_socket.getInetAddress().getHostName().toLowerCase());
103	>
104	>	// get properties
105	>	String reqProperty = getInBound();
106	>	while(!reqProperty.equals("ENDCONFIG")) {
107	>	// get the property
108	>	try {
109	>	String returnedProperty = cp.getProperty(configName, "Host."+reqProperty);
110	>	_socketOut.println(returnedProperty);
111	>	} catch (PropertyNotFoundException e) {
112	>	_socketOut.println("ERROR");
113	>	}
114	>	// get the next request
115	>	reqProperty = _socketIn.readLine();
116	>	}
117	>	_logger.write(toString(), Logger.SYSMSG, "configured host");
118	>	_socketOut.println("OK");
119	>
120	>	// get filter reference
121	>	getInBound("FILTER");
122	>	// send info
123	>	String filterList = cp.getProperty(configName, "Host.filter");
124	>	FilterInfo filterInfoRef = null;
125	>	String filter = null;
126	>	StringTokenizer st = new StringTokenizer(filterList, ";");
127	>	while (filterInfoRef==null && st.hasMoreTokens()) {
128	>	filter = st.nextToken();
129	>	_logger.write(toString(), Logger.DEBUG, " looking for filter- " + filter);
130	>	try {
131	>	filterInfoRef = FilterInfoHelper.narrow(ReferenceManager.getInstance().getCORBARef("iscream.FilterInfo\\." + filter));
132	>	} catch (ComponentCORBAException e) {
133	>	_logger.write(toString(), Logger.DEBUG, " unable to find filter- " + filter);
134	>	}
135	>	}
136	>
137	>	// hopefully we found a filter
138	>	if(filterInfoRef != null) {
139	>	_logger.write(toString(), Logger.DEBUG, " found filter- " + filter);
140	>	try {
141	>	// tell the host about it...
142	>	_socketOut.println(filterInfoRef.getHostName() + ";"
143	>	+ filterInfoRef.getUDPPort());
144	>	}
145	>	catch(org.omg.CORBA.COMM_FAILURE e) {
146	>	// failed to talk to filter, lets signal an error
147	>	_socketOut.println("ERROR");
148	>	throw new IOException("error communicating with filter - " + e);
149	>	}
150	>	}
151	>	else {
152	>	// ...or throw a wobbly (and tell the host!)
153		_socketOut.println("ERROR");
154	<	_socketOut.flush();
154	>	throw new IOException("unable to find filter for host");
155		}
156	<	inBound = _socketIn.readLine();
156	>
157		}
158	<	_logger.write(toString(), "configured host");
159	<	_socketOut.println("OK");
160	<	_socketOut.flush();
158	>	else if(cmd.equals("CHECKCONFIG")) {
159	>	// respond to CHECKCONFIG
160	>	_socketOut.println("OK");
161	>
162	>	// try for {filelist}
163	>	String filelist = getInBound();
164	>	_socketOut.println("OK");
165	>
166	>	// try for {lastModified}
167	>	String lastModified = getInBound();
168	>	// check to see if a config update has happen
169	>	boolean newConfig = _configManager.isModified(filelist, Long.parseLong(lastModified));
170	>	if(newConfig) {
171	>	// new config !
172	>	_socketOut.println("EXPIRED");
173	>	}
174	>	else {
175	>	// nothing has changed
176	>	_socketOut.println("OK");
177	>	}
178	>	}
179	>	else {
180	>	_socketOut.println("ERROR");
181	>	}
182	>	// get the next command
183	>	cmd = getInBound();
184		}
185	+	// respond to END
186	+	_socketOut.println("OK");
187
188		} catch (Exception e) {
189	<	_logger.write(toString(), e.toString());
189	>	_logger.write(toString(), Logger.ERROR, "ERROR - " + e);
190		}
191
84	–	_socketOut.flush();
192		// Disconnect streams & socket
193		try {
194		_socketIn.close();
195		_socketOut.close();
196		_socket.close();
197		} catch (IOException e) {
198	<	_logger.write(toString(), "exception on socket close");
198	>	_logger.write(toString(), Logger.ERROR, "exception on socket close");
199		}
200	<	_logger.write(toString(), "finished");
200	>	_logger.write(toString(), Logger.SYSMSG, "finished");
201		}
202
203		/**
204		* Overrides the {@link java.lang.Object#toString() Object.toString()}
205		* method to provide clean logging (every class should have this).
206		*
207	+	* This uses the uk.org.iscream.cms.util.NameFormat class
208	+	* to format the toString()
209	+	*
210		* @return the name of this class and its CVS revision
211		*/
212		public String toString() {
213	<	return this.getClass().getName() + "{" + _socket.getInetAddress().getHostName()
214	<	+ "}(" + REVISION.substring(11, REVISION.length() - 2) + ")";
215	<
213	>	return FormatName.getName(
214	>	_name,
215	>	getClass().getName(),
216	>	REVISION);
217		}
218
219		//---PRIVATE METHODS---
220
221	+	private String getInBound(String expected) throws IOException {
222	+	// grab the input
223	+	String inBound = getInBound();
224	+	// check if it's what we're expecting
225	+	if(!inBound.equals(expected)) {
226	+	throw new IOException("protocol error - expected:"+expected+" got:" + inBound);
227	+	}
228	+	// it should be ok then
229	+	return inBound;
230	+	}
231	+
232	+	private String getInBound() throws IOException {
233	+	// grab the input
234	+	String inBound = _socketIn.readLine();
235	+	// check for null's, likely disconnection
236	+	if(inBound == null) {
237	+	throw new IOException("got null from host, maybe it died");
238	+	}
239	+	// it's a valid message it seems
240	+	return inBound;
241	+	}
242	+
243		//---ACCESSOR/MUTATOR METHODS---
244
245		//---ATTRIBUTES---
246
247	<	Configurator _configurator;
248	<	Logger _logger;
249	<	Socket _socket;
250	<	BufferedReader _socketIn;
251	<	PrintWriter _socketOut;
247	>	/**
248	>	* This holds a reference to the
249	>	* system logger that is being used.
250	>	*/
251	>	private Logger _logger = ReferenceManager.getInstance().getLogger();
252	>
253	>	/**
254	>	* A reference to the Configuration Manager the system is using
255	>	*/
256	>	private ConfigurationManager _configManager = ReferenceManager.getInstance().getCM();
257	>
258	>	/**
259	>	* This is the friendly identifier of the
260	>	* component this class is running in.
261	>	* eg, a Filter may be called "filter1",
262	>	* If this class does not have an owning
263	>	* component,  a name from the configuration
264	>	* can be placed here.  This name could also
265	>	* be changed to null for utility classes.
266	>	*/
267	>	private String _name = FilterManager.NAME;
268	>
269	>	/**
270	>	* The socket this class uses
271	>	*/
272	>	private Socket _socket;
273	>
274	>	/**
275	>	* Used for the input stream of this socket
276	>	*/
277	>	private BufferedReader _socketIn;
278	>
279	>	/**
280	>	* Used for the output stream of this socket
281	>	*/
282	>	private PrintWriter _socketOut;
283
284		//---STATIC ATTRIBUTES---
285

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