server/filtermanager/HostInit.java

//---PACKAGE DECLARATION---
package uk.ac.ukc.iscream.filtermanager;

//---IMPORTS---
import uk.ac.ukc.iscream.core.*;
import uk.ac.ukc.iscream.filter.*;
import uk.ac.ukc.iscream.util.*;
import uk.ac.ukc.iscream.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: tdb1 $
 * @version $Id: HostInit.java,v 1.24 2001/03/05 23:53:39 tdb1 Exp $
 */
class HostInit extends Thread {

//---FINAL ATTRIBUTES---

    /**
     * The current CVS revision of this class
     */
    public final String REVISION = "$Revision: 1.24 $";
    
//---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() {
        try {
            String inBound = _socketIn.readLine();
            if (!inBound.equals("STARTCONFIG")) {
                _socketOut.println("ERROR");
                throw new IOException("protocol error - expected:STARTCONFIG got:" + inBound);
            }

            Configuration myConfig = _configManager.getConfiguration("Host." + _socket.getInetAddress().getHostName().toLowerCase());
            if (myConfig == null) {
                _socketOut.println("ERROR");
                throw new IOException("error in host configuration");
            } else {
                _socketOut.println("OK");
                
                // get lastmodified
                inBound = _socketIn.readLine();
                if(!inBound.equals("LASTMODIFIED")) {
                        // protocol error
                    _socketOut.println("ERROR");
                    throw new IOException("protocol error - expected:LASTMODIFIED got:" + inBound);
                }
                else {
                        // send info
                        _socketOut.println(myConfig.getLastModified());
                }
                
                // get config fileList
                inBound = _socketIn.readLine();
                if(!inBound.equals("FILELIST")) {
                        // protocol error
                    _socketOut.println("ERROR");
                    throw new IOException("protocol error - expected:FILELIST got:" + inBound);
                }
                else {
                        // send info
                        _socketOut.println(myConfig.getFileList());
                }
                
                // send the FQDN to the host
                inBound = _socketIn.readLine();
                if(!inBound.equals("FQDN")) {
                        // protocol error
                    _socketOut.println("ERROR");
                    throw new IOException("protocol error - expected:FQDN got:" + inBound);
                }
                else {
                    // send the fqdn (of the host) to the host
                    _socketOut.println(_socket.getInetAddress().getHostName().toLowerCase());
                }
                
                // get properties
                inBound = _socketIn.readLine();
                while(!inBound.equals("ENDCONFIG")) {
                          
                    // get the property
                    try {
                        String returnedProperty = myConfig.getProperty("Host."+inBound);    
                        
                        _socketOut.println(returnedProperty);
    
                    } catch (org.omg.CORBA.MARSHAL e) {
                        _socketOut.println("ERROR");
                    }
                    inBound = _socketIn.readLine();
                }
                _logger.write(toString(), Logger.SYSMSG, "configured host");
                _socketOut.println("OK");
                
                // get filter reference
                inBound = _socketIn.readLine();
                if(!inBound.equals("FILTER")) {
                        // protocol error
                    _socketOut.println("ERROR");
                    throw new IOException("protocol error - expected:FILTER got:" + inBound);
                }
                else {
                        // send info
                        String filterList = myConfig.getProperty("Host.filter");
                        Filter filterRef = null;
                        String filter = null;
                        StringTokenizer st = new StringTokenizer(filterList, ";");
                    while (filterRef==null && st.hasMoreTokens()) {
                        filter = st.nextToken();
                        _logger.write(toString(), Logger.DEBUG, " looking for filter- " + filter);
                        try {
                            filterRef = FilterHelper.narrow(ReferenceManager.getInstance().getCORBARef("iscream.Filter." + filter));
                        } catch (ComponentCORBAException e) {
                            _logger.write(toString(), Logger.DEBUG, " unable to find filter- " + filter);
                        }
                    }
                        
                        // hopefully we found a filter
                    if(filterRef != null) {
                        _logger.write(toString(), Logger.DEBUG, " found filter- " + filter);
                        // tell the host about it...
                            _socketOut.println(filterRef.getHostName() + ";"
                                             + filterRef.getUDPPort() + ";"
                                             + filterRef.getTCPPort());
                        }
                        else {
                            // ...or throw a wobbly (and tell the host!)
                            _socketOut.println("ERROR");
                            throw new IOException("unable to find filter for host");
                        }
                }
                
                // confirm that all is ok
                inBound = _socketIn.readLine();
                if(!inBound.equals("END")) {
                        // protocol error
                    _socketOut.println("ERROR");
                    throw new IOException("protocol error - expected:END got:" + inBound);
                }
                else {
                        // send ok
                        _socketOut.println("OK");
                }

            }
            
        } catch (Exception e) {
            _logger.write(toString(), Logger.ERROR, "ERROR - " + e);
        }
        
        _socketOut.flush();
        // 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.ac.ukc.iscream.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---

//---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:	1.25
Committed:	Tue Mar 13 02:19:47 2001 UTC (23 years, 2 months ago) by tdb
Branch:	MAIN
Changes since 1.24:	+5 -2 lines
Log Message:	Given all the classes that extend Thread a name using Thread.setName(). It is only representative as far as it will tell us which class the Thread is, but this will go some way to aiding debugging. If time permitted, more effort could be taken to name each thread according to what it was dealing with.
#	Content
1	//---PACKAGE DECLARATION---
2	package uk.ac.ukc.iscream.filtermanager;
3
4	//---IMPORTS---
5	import uk.ac.ukc.iscream.core.*;
6	import uk.ac.ukc.iscream.filter.*;
7	import uk.ac.ukc.iscream.util.*;
8	import uk.ac.ukc.iscream.componentmanager.*;
9	import java.net.*;
10	import java.io.*;
11	import java.util.*;
12
13	/**
14	* Handles setting up a host.
15	* This class provides a host with appropriate configuration
16	* and a reference to a Filter to which it should pass data.
17	*
18	* @author $Author: tdb1 $
19	* @version $Id: HostInit.java,v 1.24 2001/03/05 23:53:39 tdb1 Exp $
20	*/
21	class HostInit extends Thread {
22
23	//---FINAL ATTRIBUTES---
24
25	/**
26	* The current CVS revision of this class
27	*/
28	public final String REVISION = "$Revision: 1.24 $";
29
30	//---STATIC METHODS---
31
32	//---CONSTRUCTORS---
33
34	/**
35	* Construct a new HostInit.
36	*
37	* @param socket The socket to which the host is connected
38	*/
39	public HostInit(Socket socket) throws IOException {
40	// set the Thread name
41	setName("filtermanager.HostInit");
42
43	_socket = socket;
44	// setup reader & writer
45	_socketIn = new BufferedReader(new InputStreamReader(_socket.getInputStream()));
46	_socketOut = new PrintWriter(_socket.getOutputStream(), true);
47	_logger.write(toString(), Logger.SYSINIT, "created");
48	}
49
50	//---PUBLIC METHODS---
51
52	/**
53	* Main method in this class, which handles communicating with
54	* the host to determine it's setup.
55	*/
56	public void run() {
57	try {
58	String inBound = _socketIn.readLine();
59	if (!inBound.equals("STARTCONFIG")) {
60	_socketOut.println("ERROR");
61	throw new IOException("protocol error - expected:STARTCONFIG got:" + inBound);
62	}
63
64	Configuration myConfig = _configManager.getConfiguration("Host." + _socket.getInetAddress().getHostName().toLowerCase());
65	if (myConfig == null) {
66	_socketOut.println("ERROR");
67	throw new IOException("error in host configuration");
68	} else {
69	_socketOut.println("OK");
70
71	// get lastmodified
72	inBound = _socketIn.readLine();
73	if(!inBound.equals("LASTMODIFIED")) {
74	// protocol error
75	_socketOut.println("ERROR");
76	throw new IOException("protocol error - expected:LASTMODIFIED got:" + inBound);
77	}
78	else {
79	// send info
80	_socketOut.println(myConfig.getLastModified());
81	}
82
83	// get config fileList
84	inBound = _socketIn.readLine();
85	if(!inBound.equals("FILELIST")) {
86	// protocol error
87	_socketOut.println("ERROR");
88	throw new IOException("protocol error - expected:FILELIST got:" + inBound);
89	}
90	else {
91	// send info
92	_socketOut.println(myConfig.getFileList());
93	}
94
95	// send the FQDN to the host
96	inBound = _socketIn.readLine();
97	if(!inBound.equals("FQDN")) {
98	// protocol error
99	_socketOut.println("ERROR");
100	throw new IOException("protocol error - expected:FQDN got:" + inBound);
101	}
102	else {
103	// send the fqdn (of the host) to the host
104	_socketOut.println(_socket.getInetAddress().getHostName().toLowerCase());
105	}
106
107	// get properties
108	inBound = _socketIn.readLine();
109	while(!inBound.equals("ENDCONFIG")) {
110
111	// get the property
112	try {
113	String returnedProperty = myConfig.getProperty("Host."+inBound);
114
115	_socketOut.println(returnedProperty);
116
117	} catch (org.omg.CORBA.MARSHAL e) {
118	_socketOut.println("ERROR");
119	}
120	inBound = _socketIn.readLine();
121	}
122	_logger.write(toString(), Logger.SYSMSG, "configured host");
123	_socketOut.println("OK");
124
125	// get filter reference
126	inBound = _socketIn.readLine();
127	if(!inBound.equals("FILTER")) {
128	// protocol error
129	_socketOut.println("ERROR");
130	throw new IOException("protocol error - expected:FILTER got:" + inBound);
131	}
132	else {
133	// send info
134	String filterList = myConfig.getProperty("Host.filter");
135	Filter filterRef = null;
136	String filter = null;
137	StringTokenizer st = new StringTokenizer(filterList, ";");
138	while (filterRef==null && st.hasMoreTokens()) {
139	filter = st.nextToken();
140	_logger.write(toString(), Logger.DEBUG, " looking for filter- " + filter);
141	try {
142	filterRef = FilterHelper.narrow(ReferenceManager.getInstance().getCORBARef("iscream.Filter." + filter));
143	} catch (ComponentCORBAException e) {
144	_logger.write(toString(), Logger.DEBUG, " unable to find filter- " + filter);
145	}
146	}
147
148	// hopefully we found a filter
149	if(filterRef != null) {
150	_logger.write(toString(), Logger.DEBUG, " found filter- " + filter);
151	// tell the host about it...
152	_socketOut.println(filterRef.getHostName() + ";"
153	+ filterRef.getUDPPort() + ";"
154	+ filterRef.getTCPPort());
155	}
156	else {
157	// ...or throw a wobbly (and tell the host!)
158	_socketOut.println("ERROR");
159	throw new IOException("unable to find filter for host");
160	}
161	}
162
163	// confirm that all is ok
164	inBound = _socketIn.readLine();
165	if(!inBound.equals("END")) {
166	// protocol error
167	_socketOut.println("ERROR");
168	throw new IOException("protocol error - expected:END got:" + inBound);
169	}
170	else {
171	// send ok
172	_socketOut.println("OK");
173	}
174
175	}
176
177	} catch (Exception e) {
178	_logger.write(toString(), Logger.ERROR, "ERROR - " + e);
179	}
180
181	_socketOut.flush();
182	// Disconnect streams & socket
183	try {
184	_socketIn.close();
185	_socketOut.close();
186	_socket.close();
187	} catch (IOException e) {
188	_logger.write(toString(), Logger.ERROR, "exception on socket close");
189	}
190	_logger.write(toString(), Logger.SYSMSG, "finished");
191	}
192
193	/**
194	* Overrides the {@link java.lang.Object#toString() Object.toString()}
195	* method to provide clean logging (every class should have this).
196	*
197	* This uses the uk.ac.ukc.iscream.util.NameFormat class
198	* to format the toString()
199	*
200	* @return the name of this class and its CVS revision
201	*/
202	public String toString() {
203	return FormatName.getName(
204	_name,
205	getClass().getName(),
206	REVISION);
207	}
208
209	//---PRIVATE METHODS---
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	}