host/java/Config.java

//---PACKAGE DECLARATION---

//---IMPORTS---

import java.net.*;
import java.util.*;
import java.io.*;

/**
 * Configurator object for the JavaHost
 * Will connect to the filter manager and collect its specific
 * configuration
 *
 * @author  $Author: ab11 $
 * @version $Id: Config.java,v 1.4 2000/11/30 17:32:18 ab11 Exp $
 */
class Config {

//---FINAL ATTRIBUTES---

//---STATIC METHODS---

//---CONSTRUCTORS---

    public Config( String serverName, int serverPort ){
        // takes in the master config settings and creates a connection with
        // this computer, and downloads all the values listed in config.values.txt
        // which should be in the local directory
        
        // read in from the file.
        try {
            System.out.println("Reading Config file");
            BufferedReader inFile = new BufferedReader(new FileReader("config.values.txt"));
            aList = new ArrayList();
            numProperties = 0;
            String tmpIn = inFile.readLine();
            while ( tmpIn != null ){
                aList.add(numProperties, tmpIn);
                numProperties++;
                tmpIn = inFile.readLine();  
            }
            System.out.println("Added "+numProperties+" properties");
        }
        catch ( FileNotFoundException e ){
            // do something
            System.out.println("Config file not found");
        }
        catch ( IOException e ){
            // do something
        }
    
        myProperties = new HashMap();
        configChanged = false;
        
        // time in seconds before first retry
        filterManagerRetryTime = 10;
    
        // do the funky jibble
        connect(serverName, serverPort);
    }

//---PUBLIC METHODS---

    public InetAddress getFilterName(){
        // will return the most recient IP address (if it is dynamic for whatever reason
        try {
            return InetAddress.getByName(filterName);
        }
        catch ( UnknownHostException e ){
            // do something
            return null;
        }
        
    }
    
    /**
     * Used to retrieve the port to send UDP packets to on the filter
     *
     * @return an integer corrisponding to the UDP port of the filter
     */
    public int getFilterUDPPort(){
        
        return filterUDPPort;
    }
    
    /**
     * Used to retrieve the port to send TCP heartbeats to on the filter
     *
     * @return an integer corrisponding to the TCP of the filter
     */    
    public int getFilterTCPPort(){
        
        return filterTCPPort;
    }

    /**
     * Used to get the hostname of the filter we are to talk to.
     *
     * @return a string representing the hostname of the filter
     */
    public String getProperty( String name ){
        
        if ( myProperties.containsKey(name) ){
            // its in there, may return ERROR
            return (String) myProperties.get(name);
        }
        else
        {
            // can't have been in the config.values.txt file!
            return "ERROR";
        }
    }


//---PRIVATE METHODS---

    private void connect( String serverName, int serverPort ){
        Socket mySocket;
        configChanged = false;
        
        System.out.println("Establishing connection with filter manager");
        
        // might throw a UnknownHostException
        try {
            mySocket = new Socket( serverName, serverPort );
             // ok we have our socket connected ok. grab their input and output streams
            socketIn = new BufferedReader(new InputStreamReader(mySocket.getInputStream()));
            socketOut = new PrintWriter(mySocket.getOutputStream());
 
            if (sendCommand("STARTCONFIG").equals("OK")){
                // everything is fine
                // sendCommand("LASTMODIFIED");
                lastModified = sendCommand("LASTMODIFIED");
                
                fileList = sendCommand("FILELIST");
                // get all the properties
                if ( numProperties > 0 ){
                        // sendCommand("CONFIG");
                        for ( int i = 0; i < numProperties; i++ ){
                            String property = (String) aList.get(i);
                            myProperties.put(property, sendCommand(property));  
                        }
                }
                
                sendCommand("ENDCONFIG");
                String filter_data = sendCommand("FILTER");
                StringTokenizer tok = new StringTokenizer(filter_data,";");
                filterName = tok.nextToken();
                filterUDPPort = Integer.parseInt(tok.nextToken());
                filterTCPPort = Integer.parseInt(tok.nextToken());
                                    
                sendCommand("END");         
                 
            }
           
        
            // close the socket
            mySocket.close();
            System.out.println("Completed communication with filter manager");
        
        }
        catch ( UnknownHostException e ){
            // what to do   
            System.out.println("Host not found");    
        }
        catch ( IOException e ){
            // what to do 
            System.out.println("Unable to read from socket, might not be open");
            System.out.println("Retrying in "+filterManagerRetryTime+" seconds");
            configChanged = true;
            try {
                Thread.sleep(filterManagerRetryTime*1000);
            }
            catch( InterruptedException f ){
                System.out.println("Sleep interrupted");
            }
            filterManagerRetryTime = filterManagerRetryTime * 2;
            // warning this WILL cause a stack overflow after a while..
            // need to fix it.
            connect(serverName, serverPort);
        }
            
    } // connect


    public void sendHeartBeat(){
        
        Socket mySocket;
        try {
                 
                mySocket = new Socket( filterName, filterTCPPort );
                // ok we have our socket connected ok. grab their input and output streams
                socketIn = new BufferedReader(new InputStreamReader(mySocket.getInputStream()));
                socketOut = new PrintWriter(mySocket.getOutputStream());
         
                        
                if ( sendCommand("HEARTBEAT").equals("OK") ){
                        if ( sendCommand("CONFIG").equals("OK") ){
                                sendCommand(fileList);
                                if ( sendCommand(lastModified).equals("ERROR") ){
                                        // config has changed
                                        configChanged = true;
                                }
                                sendCommand("ENDHEARTBEAT");
                        }
                }       
        }
        catch ( UnknownHostException e ){
            // what to do   
            System.out.println("Host not found");    
        }
        catch ( IOException e ){
            // what to do 
            System.out.println("Unable to read from socket, might not be open");
            System.out.println("Re-establishing contact with filter manager");
            configChanged = true;
        }
    }

    private String sendCommand(String command){
        
        // System.out.println("Writing command: "+command);
        socketOut.println(command);
        socketOut.flush();
        try {
           String response = socketIn.readLine();
           // System.out.println("Got: "+response);
           return response;
        }
        catch ( IOException e ){
            // something went wrong
            System.out.println("Error recieving response");
            return "ERROR";   
        }
    }

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

    public boolean reloadConfig(){
        return configChanged;
    } 

//---ATTRIBUTES---

    private boolean configChanged;
    private String lastModified;
    private String fileList;
    private int numProperties;
    private HashMap myProperties;
    private String filterName;
    private int filterUDPPort;
    private int filterTCPPort;
    private ArrayList aList;
    private BufferedReader socketIn;
    private PrintWriter socketOut;
    private int filterManagerRetryTime;
    

//---STATIC ATTRIBUTES---

} // class
Revision:	1.5
Committed:	Thu Dec 7 23:18:28 2000 UTC (23 years, 11 months ago) by tdb
Branch:	MAIN
Changes since 1.4:	+4 -4 lines
Log Message:	Just a terminology change :)
#	User	Rev	Content
1	ab11	1.2	//---PACKAGE DECLARATION---
2
3			//---IMPORTS---
4
5	ab11	1.1	import java.net.*;
6			import java.util.*;
7			import java.io.*;
8
9	ab11	1.2	/**
10			* Configurator object for the JavaHost
11	tdb	1.5	* Will connect to the filter manager and collect its specific
12	ab11	1.2	* configuration
13			*
14			* @author $Author: ab11 $
15	tdb	1.5	* @version $Id: Config.java,v 1.4 2000/11/30 17:32:18 ab11 Exp $
16	ab11	1.2	*/
17	ab11	1.1	class Config {
18
19	ab11	1.2	//---FINAL ATTRIBUTES---
20
21			//---STATIC METHODS---
22
23			//---CONSTRUCTORS---
24
25			public Config( String serverName, int serverPort ){
26			// takes in the master config settings and creates a connection with
27			// this computer, and downloads all the values listed in config.values.txt
28			// which should be in the local directory
29
30			// read in from the file.
31			try {
32	ab11	1.3	System.out.println("Reading Config file");
33	ab11	1.2	BufferedReader inFile = new BufferedReader(new FileReader("config.values.txt"));
34			aList = new ArrayList();
35			numProperties = 0;
36			String tmpIn = inFile.readLine();
37			while ( tmpIn != null ){
38	ab11	1.3	aList.add(numProperties, tmpIn);
39	ab11	1.2	numProperties++;
40			tmpIn = inFile.readLine();
41			}
42	ab11	1.3	System.out.println("Added "+numProperties+" properties");
43	ab11	1.2	}
44			catch ( FileNotFoundException e ){
45			// do something
46	ab11	1.3	System.out.println("Config file not found");
47	ab11	1.2	}
48			catch ( IOException e ){
49			// do something
50			}
51
52	ab11	1.3	myProperties = new HashMap();
53			configChanged = false;
54
55	ab11	1.4	// time in seconds before first retry
56			filterManagerRetryTime = 10;
57	ab11	1.3
58	ab11	1.2	// do the funky jibble
59			connect(serverName, serverPort);
60			}
61
62			//---PUBLIC METHODS---
63
64			public InetAddress getFilterName(){
65			// will return the most recient IP address (if it is dynamic for whatever reason
66			try {
67			return InetAddress.getByName(filterName);
68			}
69			catch ( UnknownHostException e ){
70			// do something
71			return null;
72			}
73
74			}
75
76			/**
77			* Used to retrieve the port to send UDP packets to on the filter
78			*
79			* @return an integer corrisponding to the UDP port of the filter
80			*/
81			public int getFilterUDPPort(){
82
83			return filterUDPPort;
84			}
85
86			/**
87			* Used to retrieve the port to send TCP heartbeats to on the filter
88			*
89			* @return an integer corrisponding to the TCP of the filter
90			*/
91			public int getFilterTCPPort(){
92
93			return filterTCPPort;
94			}
95
96			/**
97			* Used to get the hostname of the filter we are to talk to.
98			*
99			* @return a string representing the hostname of the filter
100			*/
101			public String getProperty( String name ){
102
103			if ( myProperties.containsKey(name) ){
104			// its in there, may return ERROR
105			return (String) myProperties.get(name);
106			}
107			else
108			{
109			// can't have been in the config.values.txt file!
110			return "ERROR";
111			}
112			}
113
114
115			//---PRIVATE METHODS---
116
117			private void connect( String serverName, int serverPort ){
118			Socket mySocket;
119	ab11	1.3	configChanged = false;
120
121	tdb	1.5	System.out.println("Establishing connection with filter manager");
122	ab11	1.2
123			// might throw a UnknownHostException
124			try {
125	ab11	1.3	mySocket = new Socket( serverName, serverPort );
126			// ok we have our socket connected ok. grab their input and output streams
127	ab11	1.2	socketIn = new BufferedReader(new InputStreamReader(mySocket.getInputStream()));
128			socketOut = new PrintWriter(mySocket.getOutputStream());
129	ab11	1.3
130			if (sendCommand("STARTCONFIG").equals("OK")){
131	ab11	1.2	// everything is fine
132	ab11	1.3	// sendCommand("LASTMODIFIED");
133			lastModified = sendCommand("LASTMODIFIED");
134	ab11	1.2
135	ab11	1.3	fileList = sendCommand("FILELIST");
136	ab11	1.2	// get all the properties
137	ab11	1.3	if ( numProperties > 0 ){
138			// sendCommand("CONFIG");
139			for ( int i = 0; i < numProperties; i++ ){
140			String property = (String) aList.get(i);
141			myProperties.put(property, sendCommand(property));
142			}
143	ab11	1.2	}
144
145			sendCommand("ENDCONFIG");
146			String filter_data = sendCommand("FILTER");
147			StringTokenizer tok = new StringTokenizer(filter_data,";");
148			filterName = tok.nextToken();
149			filterUDPPort = Integer.parseInt(tok.nextToken());
150			filterTCPPort = Integer.parseInt(tok.nextToken());
151	ab11	1.4
152	ab11	1.2	sendCommand("END");
153	ab11	1.3
154	ab11	1.2	}
155	ab11	1.3
156	ab11	1.2
157			// close the socket
158			mySocket.close();
159	tdb	1.5	System.out.println("Completed communication with filter manager");
160	ab11	1.2
161			}
162			catch ( UnknownHostException e ){
163	ab11	1.3	// what to do
164			System.out.println("Host not found");
165	ab11	1.2	}
166			catch ( IOException e ){
167			// what to do
168	ab11	1.3	System.out.println("Unable to read from socket, might not be open");
169	ab11	1.4	System.out.println("Retrying in "+filterManagerRetryTime+" seconds");
170			configChanged = true;
171			try {
172			Thread.sleep(filterManagerRetryTime*1000);
173			}
174			catch( InterruptedException f ){
175			System.out.println("Sleep interrupted");
176			}
177			filterManagerRetryTime = filterManagerRetryTime * 2;
178			// warning this WILL cause a stack overflow after a while..
179			// need to fix it.
180			connect(serverName, serverPort);
181	ab11	1.2	}
182
183			} // connect
184
185
186	ab11	1.3	public void sendHeartBeat(){
187
188			Socket mySocket;
189			try {
190
191			mySocket = new Socket( filterName, filterTCPPort );
192			// ok we have our socket connected ok. grab their input and output streams
193			socketIn = new BufferedReader(new InputStreamReader(mySocket.getInputStream()));
194			socketOut = new PrintWriter(mySocket.getOutputStream());
195
196
197			if ( sendCommand("HEARTBEAT").equals("OK") ){
198			if ( sendCommand("CONFIG").equals("OK") ){
199			sendCommand(fileList);
200			if ( sendCommand(lastModified).equals("ERROR") ){
201			// config has changed
202			configChanged = true;
203			}
204			sendCommand("ENDHEARTBEAT");
205			}
206			}
207			}
208			catch ( UnknownHostException e ){
209			// what to do
210			System.out.println("Host not found");
211			}
212			catch ( IOException e ){
213			// what to do
214			System.out.println("Unable to read from socket, might not be open");
215	ab11	1.4	System.out.println("Re-establishing contact with filter manager");
216			configChanged = true;
217	ab11	1.3	}
218			}
219
220	ab11	1.2	private String sendCommand(String command){
221
222	ab11	1.3	// System.out.println("Writing command: "+command);
223	ab11	1.2	socketOut.println(command);
224	ab11	1.3	socketOut.flush();
225	ab11	1.2	try {
226	ab11	1.3	String response = socketIn.readLine();
227			// System.out.println("Got: "+response);
228			return response;
229	ab11	1.2	}
230			catch ( IOException e ){
231			// something went wrong
232	ab11	1.3	System.out.println("Error recieving response");
233	ab11	1.2	return "ERROR";
234			}
235			}
236
237			//---ACCESSOR/MUTATOR METHODS---
238
239	ab11	1.3	public boolean reloadConfig(){
240			return configChanged;
241			}
242
243	ab11	1.2	//---ATTRIBUTES---
244
245	ab11	1.3	private boolean configChanged;
246	ab11	1.2	private String lastModified;
247	ab11	1.3	private String fileList;
248	ab11	1.2	private int numProperties;
249	ab11	1.3	private HashMap myProperties;
250	ab11	1.2	private String filterName;
251			private int filterUDPPort;
252			private int filterTCPPort;
253			private ArrayList aList;
254			private BufferedReader socketIn;
255			private PrintWriter socketOut;
256	ab11	1.4	private int filterManagerRetryTime;
257	ab11	1.2
258
259
260			//---STATIC ATTRIBUTES---
261	ab11	1.1
262			} // class