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.Socket;
import java.io.*;

/**
 * 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 1.15 2001/01/28 05:38:13 tdb1 Exp $
 */
class HostInit extends Thread {

//---FINAL ATTRIBUTES---

    /**
     * The current CVS revision of this class
     */
    public final String REVISION = "$Revision: 1.15 $";
    
//---STATIC METHODS---

//---CONSTRUCTORS---

    /**
     * Construct a new HostInit.
     *
     * @param socket The socket to which the host is connected
     */
    public HostInit(Socket socket) throws IOException {
        _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());
                }

                // 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 parentFilter =  myConfig.getProperty("Host.filter");
                        _logger.write(toString(), Logger.DEBUG, " looking for parent - " + parentFilter);
                    Filter filter = FilterHelper.narrow(ReferenceManager.getInstance().getCORBARef("iscream.Filter." + parentFilter));
                        _socketOut.println(filter.getHostName() + ";"
                                         + filter.getUDPPort() + ";"
                                         + filter.getTCPPort());
                }
                
                // 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.getMessage());
        }
        
        _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:	1.16
Committed:	Wed Feb 7 13:47:22 2001 UTC (23 years, 3 months ago) by tdb
Branch:	MAIN
Changes since 1.15:	+3 -16 lines
Log Message:	Made use of the autoflush feature of PrintWriter.
#	User	Rev	Content
1	tdb	1.1	//---PACKAGE DECLARATION---
2	tdb	1.9	package uk.ac.ukc.iscream.filtermanager;
3	tdb	1.1
4			//---IMPORTS---
5			import uk.ac.ukc.iscream.core.*;
6	tdb	1.7	import uk.ac.ukc.iscream.filter.*;
7	tdb	1.11	import uk.ac.ukc.iscream.util.*;
8	tdb	1.14	import uk.ac.ukc.iscream.componentmanager.*;
9	tdb	1.1	import java.net.Socket;
10			import java.io.*;
11
12			/**
13	tdb	1.11	* Handles setting up a host.
14	ajm	1.12	* This class provides a host with appropriate configuration
15			* and a reference to a Filter to which it should pass data.
16	tdb	1.1	*
17	tdb	1.15	* @author $Author: tdb1 $
18	tdb	1.16	* @version $Id: HostInit.java,v 1.15 2001/01/28 05:38:13 tdb1 Exp $
19	tdb	1.1	*/
20			class HostInit extends Thread {
21
22			//---FINAL ATTRIBUTES---
23
24			/**
25			* The current CVS revision of this class
26			*/
27	tdb	1.16	public final String REVISION = "$Revision: 1.15 $";
28	tdb	1.1
29			//---STATIC METHODS---
30
31			//---CONSTRUCTORS---
32
33	tdb	1.15	/**
34			* Construct a new HostInit.
35			*
36			* @param socket The socket to which the host is connected
37			*/
38	tdb	1.11	public HostInit(Socket socket) throws IOException {
39	tdb	1.1	_socket = socket;
40	tdb	1.15	// setup reader & writer
41	tdb	1.1	_socketIn = new BufferedReader(new InputStreamReader(_socket.getInputStream()));
42	tdb	1.16	_socketOut = new PrintWriter(_socket.getOutputStream(), true);
43	tdb	1.11	_logger.write(toString(), Logger.SYSINIT, "created");
44	tdb	1.1	}
45
46			//---PUBLIC METHODS---
47
48	tdb	1.15	/**
49			* Main method in this class, which handles communicating with
50			* the host to determine it's setup.
51			*/
52	tdb	1.1	public void run() {
53			try {
54			String inBound = _socketIn.readLine();
55			if (!inBound.equals("STARTCONFIG")) {
56			_socketOut.println("ERROR");
57	tdb	1.7	throw new IOException("protocol error - expected:STARTCONFIG got:" + inBound);
58	tdb	1.1	}
59
60	ajm	1.8	Configuration myConfig = _configManager.getConfiguration("Host." + _socket.getInetAddress().getHostName().toLowerCase());
61	tdb	1.1	if (myConfig == null) {
62			_socketOut.println("ERROR");
63	tdb	1.7	throw new IOException("error in host configuration");
64	tdb	1.1	} else {
65			_socketOut.println("OK");
66
67	tdb	1.2	// get lastmodified
68			inBound = _socketIn.readLine();
69	tdb	1.4	if(!inBound.equals("LASTMODIFIED")) {
70			// protocol error
71	tdb	1.2	_socketOut.println("ERROR");
72	tdb	1.7	throw new IOException("protocol error - expected:LASTMODIFIED got:" + inBound);
73	tdb	1.4	}
74			else {
75			// send info
76			_socketOut.println(myConfig.getLastModified());
77	tdb	1.2	}
78
79	tdb	1.7	// get config fileList
80			inBound = _socketIn.readLine();
81			if(!inBound.equals("FILELIST")) {
82			// protocol error
83			_socketOut.println("ERROR");
84			throw new IOException("protocol error - expected:FILELIST got:" + inBound);
85			}
86			else {
87			// send info
88			_socketOut.println(myConfig.getFileList());
89			}
90
91	tdb	1.2	// get properties
92	tdb	1.1	inBound = _socketIn.readLine();
93			while(!inBound.equals("ENDCONFIG")) {
94
95			// get the property
96			try {
97	tdb	1.10	String returnedProperty = myConfig.getProperty("Host."+inBound);
98	tdb	1.1
99			_socketOut.println(returnedProperty);
100
101			} catch (org.omg.CORBA.MARSHAL e) {
102			_socketOut.println("ERROR");
103			}
104			inBound = _socketIn.readLine();
105			}
106	tdb	1.11	_logger.write(toString(), Logger.SYSMSG, "configured host");
107	tdb	1.1	_socketOut.println("OK");
108	tdb	1.7
109			// get filter reference
110			inBound = _socketIn.readLine();
111			if(!inBound.equals("FILTER")) {
112			// protocol error
113			_socketOut.println("ERROR");
114			throw new IOException("protocol error - expected:FILTER got:" + inBound);
115			}
116			else {
117			// send info
118			String parentFilter = myConfig.getProperty("Host.filter");
119	tdb	1.11	_logger.write(toString(), Logger.DEBUG, " looking for parent - " + parentFilter);
120			Filter filter = FilterHelper.narrow(ReferenceManager.getInstance().getCORBARef("iscream.Filter." + parentFilter));
121	tdb	1.7	_socketOut.println(filter.getHostName() + ";"
122			+ filter.getUDPPort() + ";"
123			+ filter.getTCPPort());
124			}
125
126			// confirm that all is ok
127			inBound = _socketIn.readLine();
128			if(!inBound.equals("END")) {
129			// protocol error
130			_socketOut.println("ERROR");
131			throw new IOException("protocol error - expected:END got:" + inBound);
132			}
133			else {
134			// send ok
135			_socketOut.println("OK");
136			}
137
138	tdb	1.1	}
139
140			} catch (Exception e) {
141	ajm	1.12	_logger.write(toString(), Logger.ERROR, "ERROR - " + e.getMessage());
142	tdb	1.1	}
143
144			_socketOut.flush();
145			// Disconnect streams & socket
146			try {
147			_socketIn.close();
148			_socketOut.close();
149			_socket.close();
150			} catch (IOException e) {
151	tdb	1.11	_logger.write(toString(), Logger.ERROR, "exception on socket close");
152	tdb	1.1	}
153	tdb	1.11	_logger.write(toString(), Logger.SYSMSG, "finished");
154	tdb	1.1	}
155
156			/**
157			* Overrides the {@link java.lang.Object#toString() Object.toString()}
158			* method to provide clean logging (every class should have this).
159			*
160	ajm	1.12	* This uses the uk.ac.ukc.iscream.util.NameFormat class
161			* to format the toString()
162			*
163	tdb	1.1	* @return the name of this class and its CVS revision
164			*/
165			public String toString() {
166	ajm	1.12	return FormatName.getName(
167			_name,
168	ajm	1.13	getClass().getName(),
169	ajm	1.12	REVISION);
170	tdb	1.1	}
171
172			//---PRIVATE METHODS---
173
174			//---ACCESSOR/MUTATOR METHODS---
175
176			//---ATTRIBUTES---
177
178	tdb	1.11	/**
179	ajm	1.12	* This holds a reference to the
180			* system logger that is being used.
181	tdb	1.11	*/
182	ajm	1.12	private Logger _logger = ReferenceManager.getInstance().getLogger();
183	tdb	1.11
184			/**
185			* A reference to the Configuration Manager the system is using
186			*/
187	ajm	1.12	private ConfigurationManager _configManager = ReferenceManager.getInstance().getCM();
188
189			/**
190			* This is the friendly identifier of the
191			* component this class is running in.
192			* eg, a Filter may be called "filter1",
193			* If this class does not have an owning
194			* component, a name from the configuration
195			* can be placed here. This name could also
196			* be changed to null for utility classes.
197			*/
198			private String _name = FilterManager.NAME;
199
200			/**
201			* The socket this class uses
202			*/
203			private Socket _socket;
204
205			/**
206			* Used for the input stream of this socket
207			*/
208			private BufferedReader _socketIn;
209	tdb	1.11
210	ajm	1.12	/**
211			* Used for the output stream of this socket
212			*/
213			private PrintWriter _socketOut;
214	tdb	1.11
215	tdb	1.1	//---STATIC ATTRIBUTES---
216
217			}