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 configurator manager and collect its specific
 * configuration
 *
 * @author  $Author: ab11 $
 * @version $Id: Config.java,v 1.2 2000/11/27 20:36:13 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;
        
    
        // 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 config 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 config 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");
        }
            
    } // 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");
        }
    }

    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;
    

//---STATIC ATTRIBUTES---

} // class
Revision:	1.3
Committed:	Thu Nov 30 04:06:52 2000 UTC (23 years, 9 months ago) by ab11
Branch:	MAIN
Changes since 1.2:	+76 -17 lines
Log Message:	Added Heartbeat functionality, and reaload function
#	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			* Will connect to the configurator manager and collect its specific
12			* configuration
13			*
14			* @author $Author: ab11 $
15	ab11	1.3	* @version $Id: Config.java,v 1.2 2000/11/27 20:36:13 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
56	ab11	1.2	// do the funky jibble
57			connect(serverName, serverPort);
58			}
59
60			//---PUBLIC METHODS---
61
62			public InetAddress getFilterName(){
63			// will return the most recient IP address (if it is dynamic for whatever reason
64			try {
65			return InetAddress.getByName(filterName);
66			}
67			catch ( UnknownHostException e ){
68			// do something
69			return null;
70			}
71
72			}
73
74			/**
75			* Used to retrieve the port to send UDP packets to on the filter
76			*
77			* @return an integer corrisponding to the UDP port of the filter
78			*/
79			public int getFilterUDPPort(){
80
81			return filterUDPPort;
82			}
83
84			/**
85			* Used to retrieve the port to send TCP heartbeats to on the filter
86			*
87			* @return an integer corrisponding to the TCP of the filter
88			*/
89			public int getFilterTCPPort(){
90
91			return filterTCPPort;
92			}
93
94			/**
95			* Used to get the hostname of the filter we are to talk to.
96			*
97			* @return a string representing the hostname of the filter
98			*/
99			public String getProperty( String name ){
100
101			if ( myProperties.containsKey(name) ){
102			// its in there, may return ERROR
103			return (String) myProperties.get(name);
104			}
105			else
106			{
107			// can't have been in the config.values.txt file!
108			return "ERROR";
109			}
110			}
111
112
113			//---PRIVATE METHODS---
114
115			private void connect( String serverName, int serverPort ){
116			Socket mySocket;
117	ab11	1.3	configChanged = false;
118
119			System.out.println("Establishing connection with config manager");
120	ab11	1.2
121			// might throw a UnknownHostException
122			try {
123	ab11	1.3	mySocket = new Socket( serverName, serverPort );
124			// ok we have our socket connected ok. grab their input and output streams
125	ab11	1.2	socketIn = new BufferedReader(new InputStreamReader(mySocket.getInputStream()));
126			socketOut = new PrintWriter(mySocket.getOutputStream());
127	ab11	1.3
128			if (sendCommand("STARTCONFIG").equals("OK")){
129	ab11	1.2	// everything is fine
130	ab11	1.3	// sendCommand("LASTMODIFIED");
131			lastModified = sendCommand("LASTMODIFIED");
132	ab11	1.2
133	ab11	1.3	fileList = sendCommand("FILELIST");
134	ab11	1.2	// get all the properties
135	ab11	1.3	if ( numProperties > 0 ){
136			// sendCommand("CONFIG");
137			for ( int i = 0; i < numProperties; i++ ){
138			String property = (String) aList.get(i);
139			myProperties.put(property, sendCommand(property));
140			}
141	ab11	1.2	}
142
143			sendCommand("ENDCONFIG");
144			String filter_data = sendCommand("FILTER");
145			StringTokenizer tok = new StringTokenizer(filter_data,";");
146			filterName = tok.nextToken();
147			filterUDPPort = Integer.parseInt(tok.nextToken());
148			filterTCPPort = Integer.parseInt(tok.nextToken());
149
150			sendCommand("END");
151	ab11	1.3
152	ab11	1.2	}
153	ab11	1.3
154	ab11	1.2
155			// close the socket
156			mySocket.close();
157	ab11	1.3	System.out.println("Completed communication with config manager");
158	ab11	1.2
159			}
160			catch ( UnknownHostException e ){
161	ab11	1.3	// what to do
162			System.out.println("Host not found");
163	ab11	1.2	}
164			catch ( IOException e ){
165			// what to do
166	ab11	1.3	System.out.println("Unable to read from socket, might not be open");
167	ab11	1.2	}
168
169			} // connect
170
171
172	ab11	1.3	public void sendHeartBeat(){
173
174			Socket mySocket;
175			try {
176
177			mySocket = new Socket( filterName, filterTCPPort );
178			// ok we have our socket connected ok. grab their input and output streams
179			socketIn = new BufferedReader(new InputStreamReader(mySocket.getInputStream()));
180			socketOut = new PrintWriter(mySocket.getOutputStream());
181
182
183			if ( sendCommand("HEARTBEAT").equals("OK") ){
184			if ( sendCommand("CONFIG").equals("OK") ){
185			sendCommand(fileList);
186			if ( sendCommand(lastModified).equals("ERROR") ){
187			// config has changed
188			configChanged = true;
189			}
190			sendCommand("ENDHEARTBEAT");
191			}
192			}
193			}
194			catch ( UnknownHostException e ){
195			// what to do
196			System.out.println("Host not found");
197			}
198			catch ( IOException e ){
199			// what to do
200			System.out.println("Unable to read from socket, might not be open");
201			}
202			}
203
204	ab11	1.2	private String sendCommand(String command){
205
206	ab11	1.3	// System.out.println("Writing command: "+command);
207	ab11	1.2	socketOut.println(command);
208	ab11	1.3	socketOut.flush();
209	ab11	1.2	try {
210	ab11	1.3	String response = socketIn.readLine();
211			// System.out.println("Got: "+response);
212			return response;
213	ab11	1.2	}
214			catch ( IOException e ){
215			// something went wrong
216	ab11	1.3	System.out.println("Error recieving response");
217	ab11	1.2	return "ERROR";
218			}
219			}
220
221			//---ACCESSOR/MUTATOR METHODS---
222
223	ab11	1.3	public boolean reloadConfig(){
224			return configChanged;
225			}
226
227	ab11	1.2	//---ATTRIBUTES---
228
229	ab11	1.3	private boolean configChanged;
230	ab11	1.2	private String lastModified;
231	ab11	1.3	private String fileList;
232	ab11	1.2	private int numProperties;
233	ab11	1.3	private HashMap myProperties;
234	ab11	1.2	private String filterName;
235			private int filterUDPPort;
236			private int filterTCPPort;
237			private ArrayList aList;
238			private BufferedReader socketIn;
239			private PrintWriter socketOut;
240
241
242
243			//---STATIC ATTRIBUTES---
244	ab11	1.1
245			} // class