server/filtermanager/HostInit.java

/* 
 * i-scream central monitoring system
 * http://www.i-scream.org.uk
 * Copyright (C) 2000-2002 i-scream
 * 
 * This program is free software; you can redistribute it and/or
 * modify it under the terms of the GNU General Public License
 * as published by the Free Software Foundation; either version 2
 * of the License, or (at your option) any later version.
 * 
 * This program is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 * GNU General Public License for more details.
 * 
 * You should have received a copy of the GNU General Public License
 * along with this program; if not, write to the Free Software
 * Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA  02111-1307, USA.
 */

//---PACKAGE DECLARATION---
package uk.org.iscream.cms.server.filtermanager;

//---IMPORTS---
import uk.org.iscream.cms.server.core.*;
import uk.org.iscream.cms.server.filter.*;
import uk.org.iscream.cms.server.util.*;
import uk.org.iscream.cms.server.componentmanager.*;
import java.net.*;
import java.io.*;
import java.util.*;

/**
 * Handles setting up a host.
 * This class provides a host with appropriate configuration
 * and a reference to a Filter to which it should pass data.
 *
 * @author  $Author: tdb $
 * @version $Id: HostInit.java,v 1.31 2002/05/20 11:38:14 tdb Exp $
 */
class HostInit extends Thread {

//---FINAL ATTRIBUTES---

    /**
     * The current CVS revision of this class
     */
    public final String REVISION = "$Revision: 1.31 $";
    
//---STATIC METHODS---

//---CONSTRUCTORS---

    /**
     * Construct a new HostInit.
     *
     * @param socket The socket to which the host is connected
     */
    public HostInit(Socket socket) throws IOException {
        // set the Thread name
        setName("filtermanager.HostInit");
        
        _socket = socket;
        // setup reader & writer
        _socketIn = new BufferedReader(new InputStreamReader(_socket.getInputStream()));
        _socketOut = new PrintWriter(_socket.getOutputStream(), true);
        _logger.write(toString(), Logger.SYSINIT, "created");
    }
    
//---PUBLIC METHODS---

    /**
     * Main method in this class, which handles communicating with
     * the host to determine it's setup.
     */
    public void run() {
        // get a hook on the config proxy
        ConfigurationProxy cp = ConfigurationProxy.getInstance();
        // this is our config name
        String configName = "Host." + _socket.getInetAddress().getHostName().toLowerCase();
        try {
            // try for STARTCONFIG
            getInBound("STARTCONFIG");
            _socketOut.println("OK");
            
            // try for LASTMODIFIED
            getInBound("LASTMODIFIED");
            _socketOut.println(cp.getLastModified(configName));
            
            // try for FILELIST
            getInBound("FILELIST");
            _socketOut.println(cp.getFileList(configName));
            
            // try for FQDN
            getInBound("FQDN");
            _socketOut.println(_socket.getInetAddress().getHostName().toLowerCase());
            
            // get properties
            String reqProperty = getInBound();
            while(!reqProperty.equals("ENDCONFIG")) {
                // get the property
                try {
                    String returnedProperty = cp.getProperty(configName, "Host."+reqProperty);
                    _socketOut.println(returnedProperty);
                } catch (PropertyNotFoundException e) {
                    _socketOut.println("ERROR");
                }
                // get the next request
                reqProperty = _socketIn.readLine();
            }
            _logger.write(toString(), Logger.SYSMSG, "configured host");
            _socketOut.println("OK");
            
            // get filter reference
            getInBound("FILTER");
                // send info
                String filterList = cp.getProperty(configName, "Host.filter");
                FilterInfo filterInfoRef = null;
                String filter = null;
                StringTokenizer st = new StringTokenizer(filterList, ";");
            while (filterInfoRef==null && st.hasMoreTokens()) {
                filter = st.nextToken();
                _logger.write(toString(), Logger.DEBUG, " looking for filter- " + filter);
                try {
                    filterInfoRef = FilterInfoHelper.narrow(ReferenceManager.getInstance().getCORBARef("iscream.FilterInfo." + filter));
                } catch (ComponentCORBAException e) {
                    _logger.write(toString(), Logger.DEBUG, " unable to find filter- " + filter);
                }
            }
                
            // hopefully we found a filter
            if(filterInfoRef != null) {
                _logger.write(toString(), Logger.DEBUG, " found filter- " + filter);
                try {
                    // tell the host about it...
                        _socketOut.println(filterInfoRef.getHostName() + ";"
                                         + filterInfoRef.getUDPPort() + ";"
                                         + filterInfoRef.getTCPPort());
                    }
                    catch(org.omg.CORBA.COMM_FAILURE e) {
                        // failed to talk to filter, lets signal an error
                        _socketOut.println("ERROR");
                        throw new IOException("error communicating with filter - " + e);
                    }
                }
                else {
                    // ...or throw a wobbly (and tell the host!)
                    _socketOut.println("ERROR");
                    throw new IOException("unable to find filter for host");
                }
            
            // confirm ok with END
            getInBound("END");
            _socketOut.println("OK");
            
        } catch (Exception e) {
            _logger.write(toString(), Logger.ERROR, "ERROR - " + e);
        }
        
        // Disconnect streams & socket
        try {
            _socketIn.close();
            _socketOut.close();
            _socket.close();
        } catch (IOException e) {
            _logger.write(toString(), Logger.ERROR, "exception on socket close");
        }
        _logger.write(toString(), Logger.SYSMSG, "finished");
    }
    
    /**
     * Overrides the {@link java.lang.Object#toString() Object.toString()}
     * method to provide clean logging (every class should have this).
     *
     * This uses the uk.org.iscream.cms.server.util.NameFormat class
     * to format the toString()
     *
     * @return the name of this class and its CVS revision
     */
    public String toString() {
        return FormatName.getName(
            _name,
            getClass().getName(),
            REVISION);
    }

//---PRIVATE METHODS---

    private String getInBound(String expected) throws IOException {
        // grab the input
        String inBound = getInBound();
        // check if it's what we're expecting
        if(!inBound.equals(expected)) {
            throw new IOException("protocol error - expected:"+expected+" got:" + inBound);
        }
        // it should be ok then
        return inBound;
    }
    
    private String getInBound() throws IOException {
        // grab the input
        String inBound = _socketIn.readLine();
        // check for null's, likely disconnection
        if(inBound == null) {
            throw new IOException("got null from host, maybe it died");
        }
        // it's a valid message it seems
        return inBound;
    }

//---ACCESSOR/MUTATOR METHODS---

//---ATTRIBUTES---

    /**
     * This holds a reference to the
     * system logger that is being used.
     */
    private Logger _logger = ReferenceManager.getInstance().getLogger();
    
    /**
     * A reference to the Configuration Manager the system is using
     */
    private ConfigurationManager _configManager = ReferenceManager.getInstance().getCM();
    
    /**
     * This is the friendly identifier of the
     * component this class is running in.
     * eg, a Filter may be called "filter1",
     * If this class does not have an owning
     * component,  a name from the configuration
     * can be placed here.  This name could also
     * be changed to null for utility classes.
     */
    private String _name = FilterManager.NAME;
    
    /** 
     * The socket this class uses
     */
    private Socket _socket;

    /**
     * Used for the input stream of this socket
     */
    private BufferedReader _socketIn;
    
    /**
     * Used for the output stream of this socket
     */
    private PrintWriter _socketOut;

//---STATIC ATTRIBUTES---

}
Revision:	1.32
Committed:	Tue May 21 16:47:18 2002 UTC (22 years ago) by tdb
Branch:	MAIN
Changes since 1.31:	+3 -2 lines
Log Message:	Added URL to GPL headers.
#	Content
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.org.iscream.cms.server.core.*;
26	import uk.org.iscream.cms.server.filter.*;
27	import uk.org.iscream.cms.server.util.*;
28	import uk.org.iscream.cms.server.componentmanager.*;
29	import java.net.*;
30	import java.io.*;
31	import java.util.*;
32
33	/**
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: tdb $
39	* @version $Id: HostInit.java,v 1.31 2002/05/20 11:38:14 tdb Exp $
40	*/
41	class HostInit extends Thread {
42
43	//---FINAL ATTRIBUTES---
44
45	/**
46	* The current CVS revision of this class
47	*/
48	public final String REVISION = "$Revision: 1.31 $";
49
50	//---STATIC METHODS---
51
52	//---CONSTRUCTORS---
53
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(), 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	// try for STARTCONFIG
83	getInBound("STARTCONFIG");
84	_socketOut.println("OK");
85
86	// try for LASTMODIFIED
87	getInBound("LASTMODIFIED");
88	_socketOut.println(cp.getLastModified(configName));
89
90	// try for FILELIST
91	getInBound("FILELIST");
92	_socketOut.println(cp.getFileList(configName));
93
94	// try for FQDN
95	getInBound("FQDN");
96	_socketOut.println(_socket.getInetAddress().getHostName().toLowerCase());
97
98	// get properties
99	String reqProperty = getInBound();
100	while(!reqProperty.equals("ENDCONFIG")) {
101	// get the property
102	try {
103	String returnedProperty = cp.getProperty(configName, "Host."+reqProperty);
104	_socketOut.println(returnedProperty);
105	} catch (PropertyNotFoundException e) {
106	_socketOut.println("ERROR");
107	}
108	// get the next request
109	reqProperty = _socketIn.readLine();
110	}
111	_logger.write(toString(), Logger.SYSMSG, "configured host");
112	_socketOut.println("OK");
113
114	// get filter reference
115	getInBound("FILTER");
116	// send info
117	String filterList = cp.getProperty(configName, "Host.filter");
118	FilterInfo filterInfoRef = null;
119	String filter = null;
120	StringTokenizer st = new StringTokenizer(filterList, ";");
121	while (filterInfoRef==null && st.hasMoreTokens()) {
122	filter = st.nextToken();
123	_logger.write(toString(), Logger.DEBUG, " looking for filter- " + filter);
124	try {
125	filterInfoRef = FilterInfoHelper.narrow(ReferenceManager.getInstance().getCORBARef("iscream.FilterInfo." + filter));
126	} catch (ComponentCORBAException e) {
127	_logger.write(toString(), Logger.DEBUG, " unable to find filter- " + filter);
128	}
129	}
130
131	// hopefully we found a filter
132	if(filterInfoRef != null) {
133	_logger.write(toString(), Logger.DEBUG, " found filter- " + filter);
134	try {
135	// tell the host about it...
136	_socketOut.println(filterInfoRef.getHostName() + ";"
137	+ filterInfoRef.getUDPPort() + ";"
138	+ filterInfoRef.getTCPPort());
139	}
140	catch(org.omg.CORBA.COMM_FAILURE e) {
141	// failed to talk to filter, lets signal an error
142	_socketOut.println("ERROR");
143	throw new IOException("error communicating with filter - " + e);
144	}
145	}
146	else {
147	// ...or throw a wobbly (and tell the host!)
148	_socketOut.println("ERROR");
149	throw new IOException("unable to find filter for host");
150	}
151
152	// confirm ok with END
153	getInBound("END");
154	_socketOut.println("OK");
155
156	} catch (Exception e) {
157	_logger.write(toString(), Logger.ERROR, "ERROR - " + e);
158	}
159
160	// Disconnect streams & socket
161	try {
162	_socketIn.close();
163	_socketOut.close();
164	_socket.close();
165	} catch (IOException e) {
166	_logger.write(toString(), Logger.ERROR, "exception on socket close");
167	}
168	_logger.write(toString(), Logger.SYSMSG, "finished");
169	}
170
171	/**
172	* Overrides the {@link java.lang.Object#toString() Object.toString()}
173	* method to provide clean logging (every class should have this).
174	*
175	* This uses the uk.org.iscream.cms.server.util.NameFormat class
176	* to format the toString()
177	*
178	* @return the name of this class and its CVS revision
179	*/
180	public String toString() {
181	return FormatName.getName(
182	_name,
183	getClass().getName(),
184	REVISION);
185	}
186
187	//---PRIVATE METHODS---
188
189	private String getInBound(String expected) throws IOException {
190	// grab the input
191	String inBound = getInBound();
192	// check if it's what we're expecting
193	if(!inBound.equals(expected)) {
194	throw new IOException("protocol error - expected:"+expected+" got:" + inBound);
195	}
196	// it should be ok then
197	return inBound;
198	}
199
200	private String getInBound() throws IOException {
201	// grab the input
202	String inBound = _socketIn.readLine();
203	// check for null's, likely disconnection
204	if(inBound == null) {
205	throw new IOException("got null from host, maybe it died");
206	}
207	// it's a valid message it seems
208	return inBound;
209	}
210
211	//---ACCESSOR/MUTATOR METHODS---
212
213	//---ATTRIBUTES---
214
215	/**
216	* This holds a reference to the
217	* system logger that is being used.
218	*/
219	private Logger _logger = ReferenceManager.getInstance().getLogger();
220
221	/**
222	* A reference to the Configuration Manager the system is using
223	*/
224	private ConfigurationManager _configManager = ReferenceManager.getInstance().getCM();
225
226	/**
227	* This is the friendly identifier of the
228	* component this class is running in.
229	* eg, a Filter may be called "filter1",
230	* If this class does not have an owning
231	* component, a name from the configuration
232	* can be placed here. This name could also
233	* be changed to null for utility classes.
234	*/
235	private String _name = FilterManager.NAME;
236
237	/**
238	* The socket this class uses
239	*/
240	private Socket _socket;
241
242	/**
243	* Used for the input stream of this socket
244	*/
245	private BufferedReader _socketIn;
246
247	/**
248	* Used for the output stream of this socket
249	*/
250	private PrintWriter _socketOut;
251
252	//---STATIC ATTRIBUTES---
253
254	}