server/filter/TCPReaderInit.java

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

//---IMPORTS---
import uk.ac.ukc.iscream.core.*;
import uk.ac.ukc.iscream.filter.*;
import uk.ac.ukc.iscream.componentmanager.*;
import java.net.Socket;
import java.io.InputStream;
import java.io.OutputStream;
import java.io.IOException;
import java.io.*;
import uk.ac.ukc.iscream.util.*;

/**
 * This provides Host heartbeat functionality
 *
 * @author  $Author: tdb1 $
 * @version $Id: TCPReaderInit.java,v 1.12 2001/01/18 23:13:36 tdb1 Exp $
 */
class TCPReaderInit extends Thread {

//---FINAL ATTRIBUTES---

    /**
     * The current CVS revision of this class
     */
    public final String REVISION = "$Revision: 1.12 $";
    
//---STATIC METHODS---

//---CONSTRUCTORS---
    
    /**
     * Construct a new TCPReaderInit.
     *
     * @param socket the Socket to which the host is connected
     * @param queue the Queue to which we'll add data
     * @throws IOException if something goes badly wrong
     */
    public TCPReaderInit(Socket socket, Queue queue) throws IOException {
        _socket = socket;
        _queue = queue;
        // setup the reader & writer
        _socketIn = new BufferedReader(new InputStreamReader(_socket.getInputStream()));
        _socketOut = new PrintWriter(_socket.getOutputStream());
        _logger.write(toString(), Logger.SYSINIT, "created");
    }
    
//---PUBLIC METHODS---
    
    /**
     * Main run method. Will communicate with the host, inform it
     * if any updates to it's configuration are needed, and send
     * a heartbeat packet into the system.
     */
    public void run() {
        try {
            //variables
            String filelist = "";
            String lastModified = "";
            String inBound = "";
            
            inBound = _socketIn.readLine();
            if(!inBound.equals("HEARTBEAT")) {
                _socketOut.println("ERROR");
                _socketOut.flush();
                throw new IOException("protocol error - expecting:HEARTBEAT got:" + inBound);
            } else {
                _socketOut.println("OK");
                _socketOut.flush();
            }
            
            inBound = _socketIn.readLine();
            if(!inBound.equals("CONFIG")) {
                _socketOut.println("ERROR");
                _socketOut.flush();
                throw new IOException("protocol error - expecting:CONFIG got:" + inBound);
            } else {
                _socketOut.println("OK");
                _socketOut.flush();
            }
            
            inBound = _socketIn.readLine();
            filelist = inBound;
            _socketOut.println("OK");
            _socketOut.flush();
            
            inBound = _socketIn.readLine();
            lastModified = inBound;
            
            boolean newConfig = _configManager.isModified(filelist, Long.parseLong(lastModified));
            
            if(newConfig) {
                _socketOut.println("ERROR");
            }
            else {
                _socketOut.println("OK");
            }
            _socketOut.flush();
            
            inBound = _socketIn.readLine();
            if(!inBound.equals("ENDHEARTBEAT")) {
                _socketOut.println("ERROR");
                _socketOut.flush();
                throw new IOException("protocol error - expecting:ENDHEARTBEAT got:" + inBound);
            } else {
                _socketOut.println("OK");
                _socketOut.flush();
            }

            String date = new Long(System.currentTimeMillis()).toString();
            String hostname = _socket.getInetAddress().getHostName();
            String ipadd = _socket.getInetAddress().getHostAddress();
            String xml = "<packet type=\"heartbeat\" machine_name=\""+hostname+"\" date=\""+date+"\" ip=\""+ipadd+"\"></packet>";
            
            _queue.add(xml);
            
        } 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---

    /**
     * A reference to the configuration manager
     */
    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 = FilterMain.NAME;

    /**
     * This holds a reference to the
     * system logger that is being used.
     */
    private Logger _logger = ReferenceManager.getInstance().getLogger();
    
    /**
     * The socket we are talking on
     */
    Socket _socket;
    
    /** 
     * The input from the socket
     */
    BufferedReader _socketIn;
    
    /**
     * The output from the socket
     */
    PrintWriter _socketOut;
    
    /**
     * A reference to our Queue
     */
    Queue _queue;
//---STATIC ATTRIBUTES---

}
Revision:	1.13
Committed:	Sun Jan 28 05:34:38 2001 UTC (23 years, 3 months ago) by tdb
Branch:	MAIN
Changes since 1.12:	+17 -4 lines
Log Message:	Some tidying up.
#	Content
1	//---PACKAGE DECLARATION---
2	package uk.ac.ukc.iscream.filter;
3
4	//---IMPORTS---
5	import uk.ac.ukc.iscream.core.*;
6	import uk.ac.ukc.iscream.filter.*;
7	import uk.ac.ukc.iscream.componentmanager.*;
8	import java.net.Socket;
9	import java.io.InputStream;
10	import java.io.OutputStream;
11	import java.io.IOException;
12	import java.io.*;
13	import uk.ac.ukc.iscream.util.*;
14
15	/**
16	* This provides Host heartbeat functionality
17	*
18	* @author $Author: tdb1 $
19	* @version $Id: TCPReaderInit.java,v 1.12 2001/01/18 23:13:36 tdb1 Exp $
20	*/
21	class TCPReaderInit extends Thread {
22
23	//---FINAL ATTRIBUTES---
24
25	/**
26	* The current CVS revision of this class
27	*/
28	public final String REVISION = "$Revision: 1.12 $";
29
30	//---STATIC METHODS---
31
32	//---CONSTRUCTORS---
33
34	/**
35	* Construct a new TCPReaderInit.
36	*
37	* @param socket the Socket to which the host is connected
38	* @param queue the Queue to which we'll add data
39	* @throws IOException if something goes badly wrong
40	*/
41	public TCPReaderInit(Socket socket, Queue queue) throws IOException {
42	_socket = socket;
43	_queue = queue;
44	// setup the reader & writer
45	_socketIn = new BufferedReader(new InputStreamReader(_socket.getInputStream()));
46	_socketOut = new PrintWriter(_socket.getOutputStream());
47	_logger.write(toString(), Logger.SYSINIT, "created");
48	}
49
50	//---PUBLIC METHODS---
51
52	/**
53	* Main run method. Will communicate with the host, inform it
54	* if any updates to it's configuration are needed, and send
55	* a heartbeat packet into the system.
56	*/
57	public void run() {
58	try {
59	//variables
60	String filelist = "";
61	String lastModified = "";
62	String inBound = "";
63
64	inBound = _socketIn.readLine();
65	if(!inBound.equals("HEARTBEAT")) {
66	_socketOut.println("ERROR");
67	_socketOut.flush();
68	throw new IOException("protocol error - expecting:HEARTBEAT got:" + inBound);
69	} else {
70	_socketOut.println("OK");
71	_socketOut.flush();
72	}
73
74	inBound = _socketIn.readLine();
75	if(!inBound.equals("CONFIG")) {
76	_socketOut.println("ERROR");
77	_socketOut.flush();
78	throw new IOException("protocol error - expecting:CONFIG got:" + inBound);
79	} else {
80	_socketOut.println("OK");
81	_socketOut.flush();
82	}
83
84	inBound = _socketIn.readLine();
85	filelist = inBound;
86	_socketOut.println("OK");
87	_socketOut.flush();
88
89	inBound = _socketIn.readLine();
90	lastModified = inBound;
91
92	boolean newConfig = _configManager.isModified(filelist, Long.parseLong(lastModified));
93
94	if(newConfig) {
95	_socketOut.println("ERROR");
96	}
97	else {
98	_socketOut.println("OK");
99	}
100	_socketOut.flush();
101
102	inBound = _socketIn.readLine();
103	if(!inBound.equals("ENDHEARTBEAT")) {
104	_socketOut.println("ERROR");
105	_socketOut.flush();
106	throw new IOException("protocol error - expecting:ENDHEARTBEAT got:" + inBound);
107	} else {
108	_socketOut.println("OK");
109	_socketOut.flush();
110	}
111
112	String date = new Long(System.currentTimeMillis()).toString();
113	String hostname = _socket.getInetAddress().getHostName();
114	String ipadd = _socket.getInetAddress().getHostAddress();
115	String xml = "<packet type=\"heartbeat\" machine_name=\""+hostname+"\" date=\""+date+"\" ip=\""+ipadd+"\"></packet>";
116
117	_queue.add(xml);
118
119	} catch (Exception e) {
120	_logger.write(toString(), Logger.ERROR, "ERROR: " + e.getMessage());
121	}
122
123	_socketOut.flush();
124	// Disconnect streams & socket
125	try {
126	_socketIn.close();
127	_socketOut.close();
128	_socket.close();
129	} catch (IOException e) {
130	_logger.write(toString(), Logger.ERROR, "exception on socket close");
131	}
132	_logger.write(toString(), Logger.SYSMSG, "finished");
133	}
134
135	/**
136	* Overrides the {@link java.lang.Object#toString() Object.toString()}
137	* method to provide clean logging (every class should have this).
138	*
139	* This uses the uk.ac.ukc.iscream.util.NameFormat class
140	* to format the toString()
141	*
142	* @return the name of this class and its CVS revision
143	*/
144	public String toString() {
145	return FormatName.getName(
146	_name,
147	getClass().getName(),
148	REVISION);
149	}
150
151	//---PRIVATE METHODS---
152
153	//---ACCESSOR/MUTATOR METHODS---
154
155	//---ATTRIBUTES---
156
157	/**
158	* A reference to the configuration manager
159	*/
160	ConfigurationManager _configManager = ReferenceManager.getInstance().getCM();
161
162	/**
163	* This is the friendly identifier of the
164	* component this class is running in.
165	* eg, a Filter may be called "filter1",
166	* If this class does not have an owning
167	* component, a name from the configuration
168	* can be placed here. This name could also
169	* be changed to null for utility classes.
170	*/
171	private String _name = FilterMain.NAME;
172
173	/**
174	* This holds a reference to the
175	* system logger that is being used.
176	*/
177	private Logger _logger = ReferenceManager.getInstance().getLogger();
178
179	/**
180	* The socket we are talking on
181	*/
182	Socket _socket;
183
184	/**
185	* The input from the socket
186	*/
187	BufferedReader _socketIn;
188
189	/**
190	* The output from the socket
191	*/
192	PrintWriter _socketOut;
193
194	/**
195	* A reference to our Queue
196	*/
197	Queue _queue;
198	//---STATIC ATTRIBUTES---
199
200	}